Practice Exam 1 Answer Key
pdf
keyboard_arrow_up
School
Tarrant County College South East *
*We aren’t endorsed by this school
Course
1405
Subject
Chemistry
Date
Feb 20, 2024
Type
Pages
17
Uploaded by CountUniverseGorilla154
Measurement, Atoms, Elements, & Compounds These questions taken from the web resources made available from San Diego Miramar College, a member of the San Diego Community College District (SDCCD). Modifications have been made for clarity, to correct typos, and better align questions to TCC curriculum. We thank the faculty of San Diego Miramar College for making this resource available to us. Other sources include the test bank associated with the Chemistry 1406 Timberlake text. I.
The Scientific Method (Optional: Not all professors cover this section!)
Select the best answer to each of the following questions: 1.
This is performed to verify a hypothesis or theory.
A) Hypothesis
B) Law
C) Experiment
D) Theory
E) None
2.
"Conservation of Energy" is an example of a(n):
A) Hypothesis
B) Law
C) Experiments
D) Theory
E) None
3.
How many experiments are required to prove a theory incorrect?
A) All it takes is one provided the experiment is validly performed and the results are correctly interpreted.
B) At least 5 out of 10 (50%)
C) Three quarter (3/4) ratification before a theory goes on to the Science President for approval.
D) If a theory is proven invalid by an experiment, the theory can still be correct if the experimental conditions
are changed.
E) A theory cannot be proven incorrect once it has become a theory.
4.
Which of the following is an example of an observation?
A) A gas expands when heated because the gas particles are moving faster.
B) A balloon shrinks when taken outside on a very cold day.
C) A balloon is placed in an ice bath and then placed in a tub of hot water.
D) A balloon will be poked with a sharp object at the end of class.
.E) None of the above.
5. The first step in the scientific method is ______.
A) Using technology
B) making observations
C) forming a hypothesis
D) doing experiments
E) Proposing a theory
6. Which of the following is an example of a hypothesis?
A) Water boils at 100°C.
B) Seeds are planted in moist soil.
C) Plants need sunlight to grow.
D) The seeds sprouted 10 days after they were planted.
E) None of the above.
7. When a match burns, heat is evolved" is an example of
A) An experiment.
B) A theory.
C) An observation
D) A law of nature.
E) None of the above.
8. Which of the following is not a step in the scientific method?
A) Experiment.
B) Theory
C) Natural phenomenon
D) Observation
E) all are steps in the scientific method
9. "All matter is made of tiny, indestructible particles called atoms" is an example of
A) An experiment.
B) A theory
C) An observation
D) Law of nature
E) A hypothesis
10. You noticed that there is more traffic between 8 and 9 in the morning. This would be a(n)
A) Observation.
B) Hypothesis
C) Experiment
D) Theory
E) All of the above
II. Matter and Measurement Select the best answer to each of the following questions: 11. How many significant figures should there be in the answer to the following problem? (?. ? − ??. ?) × (?. 𝟕𝟗 × ??
?
)
??𝟗
A) 1 B) 2 C) 3 D) 4 E) none of the above 12. Which one of the following measurements contains the fewest number of significant figures? A) 0.01003 mm B) 100360 mL C) 1300 kg D) 1.00 • 10
-4
g E) all have the same number of significant figures 13. The numerator and the denominator of a conversion factor are related by: A) both numbers are equivalent to each other. B) both must have the same units C) when divided by each other it yields zero D) both must have metric units. E) none of the above 14. For a pharmacist dispensing pills, it is often easier to weigh the medication to be dispensed rather than to count the individual pill. If a single pill weighs 0.65 g and the pharmacist weigh out 15.6 g of pills, how many pills have been dispensed? A) 10 pills B) 16 pills C) 24 pills D) 50 pills E) none of the above 15. A nurse must administer the appropriate dosage of atropine sulfate to a 165-lb male patient. The dosage on the label of a bottle of atropine sulfate tablets reads 20 mg for every kilogram of body weight. If each tablet contains 0.5 grams of atropine sulfate, how many tablets are needed to give the correct dose to the patient? A) half tablet B) 1 tablet C) two tablets D) three tablets E) none of the above
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
16. In a Gap in France, you decide to try on a pair of French jeans. What does a waist measurement of 52 cm correspond to in inches? A) 43 in B) 32 in C) 20. in D) 130 in E) none of the above 17. The prescribed injection of a drug is 0.17 oz. If the syringe measures volume in cubic centimeters, to what mark would you draw the drug? (29.6 mL = 1 oz) A) 0.17 cc B) 5.7 × 10
−3
cc C) 5.0 cc D) 29 cc E) not enough information 18. The daily dosage of ampicillin for treating an ear infection is 100. mg per kilogram of body weight. What is the dosage for a 22-lb. baby with an ear infection? A) 1.0 mg B) 1.0 g C) 5.0 g D) 500 mg E) none of the above 19. Which is equal to a nanometer? A) 100 Å B) 1
•
10
−9
m C) 1 • 10
9
m D) 1 • 10
9
cm E) none of the above 20. In which of the following is the metric unit paired with its correct abbreviation? A) microgram and mg B) milliliter and mL C) centimeter and km D) gram and gm E) none of the above 21. Which one of the following measurements contains the most number of significant figures? A) 0.01003 g B) 100360 g C) 100000. g D) 10.0 • 10
−3
g E) 0.00002041 g
22. Which is not an SI Unit? A) gram B) mole C) second D) kilogram E) All of the above are SI units. 23. Which is not an English unit? A) liter B) pound C) yard D) ton E) They are all written in English. 24. Which is a derived unit? A) seconds B) mole C) calorie D) kilogram E) none of the above is a derived unit 25. "m" is the symbol for which of the following units: A) mile B) mole C) meter D) mass E) all of the above 26. A student calculates a problem on her calculator and the number 1570.2691 is shown on the display. If only four significant figures should be in the answer, what should she write as the final answer? A) 1570 B) 1570.3 C) 157
D) 1
.570
•
10
3
E) none of the above 27. Which of the following represents the highest temperature? A) 300 K B) Boiling point of water C) 250°F D) 75°C E) all of the above are equal
28. What is the number of significant figures that should be reported for the mass of a sample which is obtained by taking the difference between the mass of a sample plus beaker (125.260 g) and the mass of the beaker (124.5805 g) ? A) 6 B) 5 C) 4 D) 3 E) This calculation cannot be performed with only the information given. 29. Which of the following is the largest mass? A) 4.1 • 10
−6
kg B) 22 g C) 8.2 • 10
9
ng D) 3 • 10
3
mg E) 352 cg 30. In which of the following is the metric unit paired with its correct abbreviation? A) microgram and mg B) milliliter and mL C) cubic centimeter and ccm D) gram and gm E) all of the above are correctly paired 31. How many centimeters are there in 57.0 in? A) 22 cm B) 0.0445 cm C) 145 cm D) 22.4 cm E) 140 cm 32. The measurement 0.0000043 m, expressed correctly using scientific notation, is A) 4.3 × 10
−7
m B) 4
.3
×
10
−6
m C) 4.3 × 10
6
m D) 0.43 × 10
−5
m E) 43 × 10
−5
m 33. Which of the following numbers is the smallest? A) 4.0 × 10
−7
B) 8
.7
×
10
−8
C) 1.3 × 10
−2
D) 1.14 × 10
−7
E) 7.8 × 10
9
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
34. Which of the following conversion factors is a measured number? A) 10 cm/dm B) 12 in/ft C) 16 oz/lb D) 25 miles/gallon E) 12 eggs/dozen 35. Which of the following numbers contains the designated CORRECT number of significant figures? A) 0.04300 5 significant figures B) 0.00302 2 significant figures C) 156000 3 significant figures D) 1.04 2 significant figures E) 3.0650 4 significant figures 36. A researcher needed three samples of sodium chloride solution, each with a volume of 0.03510 mL. The total volume needed should be reported as A) 0.105 mL B) 0.0105 mL C) 0.10 mL D) 0.1053 mL E) 0.1100 mL 37. The correct answer for the addition of 7.5 g + 2.26 g + 1.311 g + 2 g is A) 13.071 g B) 13 g C) 13.0 g D) 10 g E) 13.1 g 38. Which of the following is the largest unit? A) millimeter B) micrometer C) meter D) decimeter E) kilometer 39. The cubic centimeter (cm
3
or cc) has the same volume as a A) cubic inch B) cubic liter C) milliliter D) centimeter E) cubic decimeter 40. A conversion factor set up correctly to convert 15 inches to centimeters is A) (
1 𝑐? 15 𝑖?
)
B) (
1 𝑖?𝑐ℎ 1 𝑐?
)
C) (
2
.54
𝑐?
1
𝑖?
)
D) (
1 𝑖?
2.54 𝑐?
)
E) (
2.54 𝑐? 15 𝑖?
)
III. Density and Related Calculations Select the best answer to each of the following questions: 41. A patient provided a 5.000 cm
3
urine specimen which weighed 5.125 grams. What is the specific gravity of the urine? A) 1.035 B) 0.975 C) 1.025 D) 1.000 E) none of the above. 42. Tequila has a density of 0.78 g/mL. What mass of Tequila will fill a 2.0 fluid ounce shot glass? (29.6 mL = 1 liquid ounce) A) 4.6 • 10
−6
kg B) 46 g C) 8.2 • 10
6
μg D) 3 • 10
3
mg E) none of the above 43. Calculate the volume that 3.41 grams of liquid will occupy if it has a specific gravity of 1.025? A) 3.40 mL B) 3.45 mL C) 3.50 mL D) 3.33 mL E) none of the above 44. Density of a substance may be classified as A) Physical property B) Chemical property C) Molecular weight D) Volume E) none of the above 45. Which statement about water is true: A) 8 grams of water is more dense that 4 grams of water. B) 8 grams of water has the same density as 4 grams of water. C) 8 grams of water is less dense that 4 grams of water. D) 8 grams of water contains the same moles as 4 grams of water. E) none of these statement is true. 46. The specific gravity of a solution is 1.18. Its density is A) 11.8 g / mL B) 0.118 g / mL C) 0.847 g / mL D) 1.18 g / mL E) 1.2 g / mL
47.
Diamond has a density of 3.52 g/mL. What is the volume in cubic centimeters of a diamond with a mass of 15.1 g?
A)
4.3 g cc
B) 4.29 cc
C)
0.233 cc
D)
53 cc
E)
53.2 cc
48.
Mercury has a specific gravity of 13.6. How many milliliters of mercury have a mass of 0.35 kg?
A)
0.0257 mL
B)
0.026 mL
C)
25.7 mL
D)
26 mL
E)
4760 mL
49. A nugget of gold with a mass of 521 g is added to 50.0 mL of water. The water level rises to a volume of 77.0 mL.
What is the density of the gold?
A)
10.4 g / mL
B)
6.77 g / mL
C)
1.00 g / mL
D)
0.0518 g / mL
E)
19.3 g / mL
50.
Which one of the following substances will float in gasoline, which has a density of 0.66 g/mL?
A)
table salt (density = 2.16 g/ml)
B)
balsa wood (density = 0.16 g/ml)
C)
sugar (density = 1.59 g/ml)
D)
aluminum (density = 2.70 g/ml)
E)
mercury (density = 13.6 g/ml)
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
IV. Atoms and Elements Select the best answer to the following questions: 51. Which of the following is not a characteristic of non-metals? A) brittle B) dull C) malleable D) poor conductor of heat and electricity E) All of the above are characteristics of non-metals 52. Which of the following groups of elements is least reactive? A) halogens B) alkaline earth metals C) transition elements D) alkali metals E) noble gases 5
3) Which of the following is NOT a precept of Dalton’s atomic theory?
A) All matter is made up of tiny particles called atoms. B) All atoms of the same element are similar to one another and different from atoms of every other element. C) Atoms of two or more elements combine to form compounds. A particular compound is always made up of the same kind of atoms in the same ratio. D) A chemical reaction involves the rearrangement, separation, or combination of atoms, but atoms themselves are never created or destroyed. E) All of the above are precepts of Dalton’s atomic theory.
54. Which element is found in its diatomic form in nature? (i.e., H
2
is a diatomic molecule) A) helium B) lithium C) nitrogen D) sulfur E) none of the above 55. Two atoms of the same element which have different mass numbers are called: A) sister atoms B) isomers C) daughters D) isotopes E) none of the above 56. A neutral subatomic particle: A) proton B) neutron C) electron D) voltron E) none of the above
57. A 14
C atom and a 15
N
+
atom have different numbers of: A) protons B) neutrons C) electrons D) protons and neutrons E) protons and electrons 58. The number of protons in the nucleus of an atom is called the ____ ____ for the atom. A) mass number B) family number C) electron number D) atomic number E) proton number 59. The sum of neutrons and protons in the nucleus of an atom is the ____ ____ for the particular atom. A) atomic number B) mass number C) isotope number D) number of moles E) valence number 60. What information cannot be determined about the following atom, given the following atomic nomenclature: 31
P A) the number of protons B) the number of neutrons C) the number of electrons D) identity of the element E) all can be determined 61. The atomic mass of chlorine (Cl) is given in the periodic table as 35.453, yet no single atom of chlorine has a mass of 35.453 amu. Which statement explains why the atomic mass of chlorine according to the periodic table is 35.453? A) This mass represents the total mass of the proton, neutron and electron for 35
Cl. B) This mass is the weighted average of all the isotopes of the chlorine atom. C) This mass is incorrect and should be changed. D) At the atomic level even the mass is quantized. E) None of these statements are correct, including this one. 62. How many electrons will calcium lose in order to combine with oxygen? A) 20 B) 8 C) 2 D) 1 E) none of the above 63. In order to form negative ions from neutral atoms: A) electrons must be gained B) electrons must be lost C) protons must be gained D) protons must be lost E) none of the above
64. An isotope of oxygen with 9 neutrons will have a mass number equal to: A) 6 B) 8 C) 16 D) 17 E) none of the above. 65. Isotopes of the same atom have different numbers of what subatomic particle? A) electrons B) protons C) neutrons D) photon E) none 66. An anion of oxygen with 9 neutrons and 9 electrons will have a charge of A) + 9 B) -2 C) +1 D) -1 E) none of these 67. Complete the following table: (Assume all atoms in the table below are neutral atoms.) Name Symbol Atomic # Mass # p
+
n
o
e
-
Phosphorus-32 𝑃
15
32
15 32 15 17 15 calcium-41 𝐶𝑎
20
41
20 41 20 21 20 Manganese-53 ?𝑛
25
53
25 53 25 28 25 Sodium-23 ?𝑎
11
23
11 23 11 12 11 68. An element with one valence electron in its outermost energy level is
A) Mg B) Na C) Cl D) Al E) none 69. How many valence electrons does the phosphorus atom have? A) 7 B) 5 C) 15 D) 31 E) none
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
70. Which of the following species have the same number of electrons as a noble gas? A) O
2- B) Si
4+ C) P
3- D) N
3- E) all have noble gas configurations 71. How many total electrons are in 59
Co 3+
? A) 24 B) 27 C) 30 D) 56 E) 62 72. The electron arrangement for nitrogen is: A) 2, 7 B) 2, 5 C) 7 D) 2, 8, 5 E) 2, 8, 8, 2 73. The electron arrangement for calcium is: A) 2, 7 B) 2, 5 C) 2, 8, 2 D) 2, 8, 5 E) 2, 8, 8, 2 74. If sodium is changed to its most stable ion, how many electrons will be in its 3
rd
shell? A) 1 B) 2 C) 4 D) 11 E) none 75. If sulfur is changed to its most stable ion, how many valence electrons will it have? A) 2 B) 4 C) 6 D) 8 E) none
V.
Compounds and Their Bonds
Select the best answer to each of the following questions: 76.
A cation has more:
A) e
-
than p
+
B) p
+
than n
C) atomic mass units than its atom
D) p
+
than e
-
E) none of the above
77.
Which element will combine with magnesium in a one to one ratio?
A) Ca
B) P
C) Cl
D) O
E) none of the above
78.
Polar covalent bonds are formed when the electrons involved in bonding
A) are transferred from one atom to the other.
B) are equally shared between the atoms involved in bonding.
C) are excited to a higher atomic orbital.
D) are unequally shared between atoms involved in bonding.
E) none of the above statements are true.
79.
Which elements when bonded to each other will from covalent bonds?
A) argon & oxygen
B) copper & carbon
C) oxygen & sulfur
D) potassium & cesium
E) H & Na
80.
Which substance below is most likely to possess covalent bonds?
A) PCl
3
B) KBr
C) MgF
2
D) ScCl
3
E) SiO
2
81.
Which substance has ionic bonds?
A) Na
2
O
B) NCl
3
C) H
2
S
D) CO
2
E) SiCl
4
82. What is the charge of Sn in SnO
2
? A) l+ B) 2+ C) 4+ D) 5+ E) none 83. Which is the correct formula for iron(II) nitride? A) Fe
3
N
2
B) Ir
3
N
2
C) Fe
2
N
3 D) Ir(NO
3
)
2
E) Fe(NO
3
)
2 84. What is the formula of the compound formed when aluminum (Al) combines with oxygen (O)? A) AlO B) AlO
2
C) Al
2
O
3
D) Al
3
O
2
E) none of the above 85. Which is the correct formula for dihydrogen monoxide? A) O
2
H B) H(II)O C) HO
2
D) H
2
O E) H
2
O
2 86. What is the correct name for (NH
4
)
2
CO
3
? A) ammonia tricarbonate B) ammonium carbonate C) ammonia (II) carbonate D) diammonium monocarbonate E) diammonium tricarbonate 87. Which of the following compounds has a (III) in its name? A) PCl
3
B) O
2
F
3
C) Cr(NO
3
)
3
D) Al
2
O
3 E) none of the above 88. Which is the correct formula for manganese(II) nitride? A) MgN B) Mg
2
N C) Mg
3
N D) Mg
3
N
2
E) none of the above
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
89. Which compound has a correctly written chemical formula? A) Mg(SO
3
)
2
B) Fe
+3
(OH
-
)
3
C) Cd
3
SO
3
D) (NH
4
)
3
N E) Ar
2
I
3
90. Which compound below contains a transition metal that has a (I) oxidation state? A) Hg
2
O B) KClO C) Au
2
(CO
3
)
3
D) Pb(IO
4
)
4
E) none of the above 91. Consider the following compounds, i -iv, below. Which statement is true about these compounds ? i) calcium bromite ii) sodium bromate iii) sodium bromide iv) sodium bicarbonate A) The cations in these compounds all have the same charge. B) all the compounds contain a polyatomic ion. C) all anions contain the bromine atom D) three of the four are ionic E) none of the above statements are true 92. What is the most stable charge for oxygen? A) +3 B) -2 C) -3 D) -4 E) Cannot be determined 93. The name of which compound is correctly written? A) diammonium carbonate B) potassium(I) phosphide C) Tin 2 sulfide D) boron trihydride E) none of the above is correctly written 94. Which of the following will combine with tellurium in a one-to-one ratio? A) Fe(III) B) Ir(II) C) V(I) D) K E) all of these 95. What is the formula of the compound dicarbon tetrachloride? A) C
4
Cl
2 B) C
2
Cl
4
C) CCl
2
D) C
2
Cl
3
E) none of the above
Match the chemical name (#96-100) with the correct formula A through H. A) MnSO
4
B) Mg(HSO
4
)
2
C) MgS
D) MgSO
4
E) Mn
3
(SO
4
)
2
F) MnSO
3
G) Mg(HSO
3
)
2 H) Mn
2
(SO
4
)
3 96. magnesium hydrogen sulfate B) Mg(HSO
4
)
2
97. manganese(III) sulfate
H) Mn
2
(SO
4
)
3 98. magnesium sulfide
C) MgS
99. mangesium sulfate
D) MgSO
4
100. manganese(II) sulfate
A) MnSO
4
Related Documents
Related Questions
-
OWLV2 | Assigr X MindTap Cen X
gs
MindTap - Cen x
Gamu of ca Go X
b My Questions
static/nb/ui/evo/index.html?elSBN=9781337790840&id%3D299783426&snapshotld%3D7857658&
CENGAGE MINDTAP
Q sea
napter 8: Chemical Composition
AA
e. aluminum sulfate
Answer
51. For each of the following samples of ionic substances, calculate the number of moles and mass
the positive ions present in each sample.
a. 4.25 g of ammonium iodide, NH,I
b. 6.31 moles of ammonium sulfide, (NH4), S
c. 9.71 g of barium phosphide, BagP2
d. 7.63 moles of calcium phosphate, Caz (PO4)2
52. For each of the following ionic substances, calculate the percentage of the overall molar mas
arrow_forward
Explain your rationale for using the summative assessment (below) from the lesson plan on mixing substances in a 5th-grade classroom based on the below standard and learning objective, including how it aligns with the learning objective.
Summative Assessment
Summative:
Components of the Lab Report
Purpose: The student should clearly state the purpose of the experiment, which is to determine whether the mixing of two or more substances results in new substances.
Procedure: The student should describe the steps they took to conduct the experiment. This includes the substances they chose to mix and the safety equipment they used.
Observations: The student should record any observable changes that occurred when the substances were mixed. This could include a color change, the formation of a precipitate, or a change in temperature.
Conclusion: The student should state whether a new substance was formed based on their observations. They should also reflect on their accuracy in…
arrow_forward
Answer question number 7 on the attached document
arrow_forward
help me answer this thank you
this is analytical chemistry
arrow_forward
Homework AX
/6920146#/6920146/16/2
Macmillan Learning
Web 2.0 scientific calculator
Williston Forge Jero...
Assignment Score:
Question 17 of 21 >
mass:
Home Page - myAl...
OO
TOOLS
×10%
91.5%
X +
HUAWEI P30
LEICA TRIPLE CAMERA
T Synonyms and Ant...
Home Page - myAl..
Resources
e
Ex Give Up?
SOAP2DAY
Essayaibot: Free Ess...
Hint
Hydrogen gas holds promise as an alternative fuel to gasoline. Calculate the mass of H₂ gas in a 38.3 L fuel tank at a pressu
2.42 x 104 mmHg and a temperature of 17.4 °C.
Paraphrasing Toof
Check Answer
Attempt 4
C
arrow_forward
phs.blackboard.com/webapps/assessment/take/take.jsp?course_assessment_id%3D 36688_1&course_id%3D_31958 1&content_id%3_1130567_1&-
8r
10
13 140 15
16
20
11
12
17
18
19
20
A Moving to another question will save this response.
Quèstion 6
Select the statement that is not supported by the following equation:
q=0=(mwater)(Cwater)(ATwater)+ (mmetal)(Cmetal)( ATmetal)
The total change in heat is the sum of the changes in heat of water and a metal.
Energy is conserved.
Energy is transferred between water and a metal.
Energy is lost during a calorimetry experiment.
A Moving to another question will save this response.
hp
&
%23
9.
6.
00
进3
arrow_forward
*CO
11 of 16 (>
Review Constants | Periodic Table
Part A
HN-HO-HƆ
Spell out the full name of the compound.
Submit
Request Answer
Part B
H.
N.
Spell out the full name of the compound.
P Pearson
Pearson Education Inc. All rights reserved. Terms of Use | Privacy Policy Permissions | Contact Us /
12:14 AM
xp ジ
10/29/2020
Delete
LEGO
Backspace
6.
arrow_forward
From the data in Table 2.5, compute the concentration of the undiluted and diluted ovalbumin samples (make sure to account for the appropriate dilution factors, DF, in the computation).
arrow_forward
There are 48 pairs of students in the following table. Each pair has quantitatively determined the mass of caffeine in a 355 mL can of the popular energy drink marketed as “GRIME” using Liquid Chromatography-Mass Spectrometry (LC-MS). The class results are presented below. Summarise and report these results including an indication of measurement uncertainty.
*
Mass of Caffeine (mg)
Mass of Caffeine (mg)
(Table continued)
208.28
207.54
207.12
206.70
208.54
208.00
208.23
208.49
207.99
206.85
208.74
207.73
206.93
207.27
206.77
208.88
207.55
206.97
208.42
208.65
208.68
208.81
207.59
208.41
207.89
208.42
208.11
206.75
206.49
208.13
207.97
206.79
200.79
208.08
207.69
207.79
207.92
207.85
206.57
208.12
206.89
208.38
207.27
208.15
207.89
206.62
207.71
207.83
arrow_forward
Supply the missing information in the table. (Given in Blue). Answers in scientific notation should be in this sample format >>> 1.0 x 10-14
arrow_forward
Briefly define the phrase “fit-for-purpose” in relation to analytical chemistry.
arrow_forward
uiz: Final Exam Fall 2022
> с
ǝl
2022 Fall A
Home
asu.instructure.com/courses/129933/quizzes/1010775/take
Time in AZ
Announcements
Modules
Pearson Access
Grades
X +
Discussions
BryteWave Course
Materials
Resources
Smarthinking Online
Tutoring
Accessibility
Honorlock ASUO
ASU Course Policies
Expand
IG.
Question 3
A piece of Na placed into a graduated cylinder of water displaces 22 mL of water. Based on the
given densities, what was the mass of the metal put into the container?
Density (g/cm³)
Metal
titanium 4.50
potassium 0.862
manganese 7.44
lead
sodium
O 21 g
O 13 g
O 17 g
O 9.7 g
O 6.3 g
11.3
4 pts
0.968
arrow_forward
Help
100% 4A
To
Public Health Ch x
* HSC 258 - Major Projec X
MindTap - Cengage Lea X
C The Illustration To TH
d%=55750828934189288909969212&elSBN=9781305657571&id=D1061392007&nbld=21... *
Q Search th
References
Use the References to access important values if needed for this question.
For the following reaction, 24.7 grams of sulfur dioxide are allowed to react with 9.95 grams of oxygen
gas .
sulfur dioxide(g) + oxygen(g)
→ sulfur trioxide(g)
What is the maximum mass of sulfur trioxide that can be formed?
grams
What is the FORMULA for the limiting reagent?
grams
What mass of the excess reagent remains after the reaction is complete?
Submit Answer
arrow_forward
- OWLV2 | Assig X MindTap Cen X
* MindTap - Cen X
amu of ca - Go X b My Questions
b/ui/evo/index.html?elSBN=9781337790840&id%3D299783426&snapshotld%3D785765&
IGAGE MINDTAP
8: Chemical Composition
A.
e. 1.96 mg of ethane, C2 H6
Answer
41. Calculate the number of moles of carbon atoms present in each of the following samples.
a. 1.271 g of ethanol, C2 H; OH
b. 3.982 g of 1,4-dichlorobenzene, C6 H4 Cl2
c. 0.4438 g of carbon suboxide, C3 02
d. 2.910 g of methylene chloride, CH2 Cl2
42 Calculate the numher of moles of sulfur afoms present in each of the following samples
arrow_forward
II. b) What is the difference between liquid-liquid, solid-liquid and solid-phase extraction? Complete the table
below and sort the following examples in the correct column: Steeping tea, washing an organic phase
(workup), brewing beer, chemical desalting of crude oil, activated carbon sugar decolorization.
liquid-liquid
solid-liquid
solid-phase
Phase that contains analyte
before extraction?
Phase that contains analyte
after extraction?
Example(s)
arrow_forward
Determine the volume of a sample of copper in (m³) with a mass of 2.2 x 105 tons and a density of 8.96 g/cm. (1
ton = 2205 lbs, 1 lb = 16 ounces, 1 kg = 2.20 lbs,1 kg = 1000g. 100 cm = 1m)
%3D
%3!
%3D
arrow_forward
Hydrogen H2{"version":"1.1","math":"<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub></math>"} is ___________________________ in water.
Question options:
insoluble
soluble and a nonelectrolyte
soluble and an electrolyte
arrow_forward
Suppose you prepared a plot for this experiment and the equation of the trendline was y = 78.012x+0.01251 Based on this information, what would be the absorbance of the solution if the concentration is 0.009697 M?
DO NOT include units in your answer.
Follow sig. fig. rules as you perform your calculations, but DO NOT round your answer until the very end of your calculation. Credit will only be given for answers that have the correct value and significant figures.
arrow_forward
Case #5
Case #6
Jeepers! Someone snuck into
the Movie Madness studio and
Someone stole the net from the
High Wire act at the Crazy Circus!
Without it, the show can't go on!
stole the reels for the new film!
The CSI team found a liquid at
At this crime scene, there were
traces of a liquid, 9 drops (at ,059
drop) were found to contain
279C, 119790, and ,06039H, What
was the empirical formula of the
compound? Who committed the
heinous act?
this crime scene, When the
,77009 sample was analyzed, it
was found to contain ,04679H
and ,724390, What was the
empirical formula? Who should
the police question?
a
Case #7
Case #8
Old Man Higgins had his
favorite cane taken from him
when he was out for a walk
through Sinister Park, The CSI
team found traces of a uhite
powder at this crime scene, To
be 61,67%CL, A flame test
yielded a yellow flame,
indicating the remaining
portion was sodium, What was
the empirical formula of the
compound? What kind of
person would steal an antique
cane?
The original…
arrow_forward
Consider the following sets of replicate measurements:
(1) Calculate the mean and standard deviation of Group A.
(2) Determine the confidence interval at 95% confidence level. Assume the data here are the only knowledge you have and no previous measurements are available.
arrow_forward
Pls answer this for me. Thank you so much
arrow_forward
What is the empirical formula of copper chloride for this lab?
arrow_forward
#9: This unknown contains 51.90 % C and 9.80 % H by mass with the remainder being an unknown
element (you have to figure out what element).
100-
Base
80
60
90
Relative Intensity
100
TRANSNETTANCE
40
20-
O
4000
10
20
3000
30
peak
656
50
40
m/z
REVENUTER
60
1300
peak
094
92-37=
90-35=
C)
70
80
1000
90
arrow_forward
What is the mass of the cube
arrow_forward
Methods of Analysis
Test #1: Polarity, or Effect of a charged rod on a stream of liquid:
This test was used to determine the relative polarity of the unknown liquid. The liquid was allowed to run out of a buret and a charged rod was brought up next to the stream. The observations were reported as to whether or not the stream of liquid responded to the charged rod and to what degree.
Try this at home with water and a plastic spoon. Rub the plastic spoon against a sweater and move it close to a small stream of water running out of your faucet!
Test #2: Volatility, or Rate of Evaporation:
A thermometer probe was wrapped with a strip of filter paper. This assembly was soaked in one of the liquids for one minute. The probe was removed, and the temperature change was monitored as the liquid evaporated. The results are given in Graph 1 below. (See Graph)
Graph 1: The curves generated of the change in temperature over time for the substances acetone, hydrogen monoxide, ethylene glycol,…
arrow_forward
How is accuracy and precision related to errors incurred in the chemical analysis?
Why systematic errors are also called determinate errors?
Why random errors are also called indeterminate errors?
Give two examples of each of the following sources of errors.
a. Instrumental error
b. Personal error
c. Method/operational error
arrow_forward
SEE MORE QUESTIONS
Recommended textbooks for you
Related Questions
- - OWLV2 | Assigr X MindTap Cen X gs MindTap - Cen x Gamu of ca Go X b My Questions static/nb/ui/evo/index.html?elSBN=9781337790840&id%3D299783426&snapshotld%3D7857658& CENGAGE MINDTAP Q sea napter 8: Chemical Composition AA e. aluminum sulfate Answer 51. For each of the following samples of ionic substances, calculate the number of moles and mass the positive ions present in each sample. a. 4.25 g of ammonium iodide, NH,I b. 6.31 moles of ammonium sulfide, (NH4), S c. 9.71 g of barium phosphide, BagP2 d. 7.63 moles of calcium phosphate, Caz (PO4)2 52. For each of the following ionic substances, calculate the percentage of the overall molar masarrow_forwardExplain your rationale for using the summative assessment (below) from the lesson plan on mixing substances in a 5th-grade classroom based on the below standard and learning objective, including how it aligns with the learning objective. Summative Assessment Summative: Components of the Lab Report Purpose: The student should clearly state the purpose of the experiment, which is to determine whether the mixing of two or more substances results in new substances. Procedure: The student should describe the steps they took to conduct the experiment. This includes the substances they chose to mix and the safety equipment they used. Observations: The student should record any observable changes that occurred when the substances were mixed. This could include a color change, the formation of a precipitate, or a change in temperature. Conclusion: The student should state whether a new substance was formed based on their observations. They should also reflect on their accuracy in…arrow_forwardAnswer question number 7 on the attached documentarrow_forward
- help me answer this thank you this is analytical chemistryarrow_forwardHomework AX /6920146#/6920146/16/2 Macmillan Learning Web 2.0 scientific calculator Williston Forge Jero... Assignment Score: Question 17 of 21 > mass: Home Page - myAl... OO TOOLS ×10% 91.5% X + HUAWEI P30 LEICA TRIPLE CAMERA T Synonyms and Ant... Home Page - myAl.. Resources e Ex Give Up? SOAP2DAY Essayaibot: Free Ess... Hint Hydrogen gas holds promise as an alternative fuel to gasoline. Calculate the mass of H₂ gas in a 38.3 L fuel tank at a pressu 2.42 x 104 mmHg and a temperature of 17.4 °C. Paraphrasing Toof Check Answer Attempt 4 Carrow_forwardphs.blackboard.com/webapps/assessment/take/take.jsp?course_assessment_id%3D 36688_1&course_id%3D_31958 1&content_id%3_1130567_1&- 8r 10 13 140 15 16 20 11 12 17 18 19 20 A Moving to another question will save this response. Quèstion 6 Select the statement that is not supported by the following equation: q=0=(mwater)(Cwater)(ATwater)+ (mmetal)(Cmetal)( ATmetal) The total change in heat is the sum of the changes in heat of water and a metal. Energy is conserved. Energy is transferred between water and a metal. Energy is lost during a calorimetry experiment. A Moving to another question will save this response. hp & %23 9. 6. 00 进3arrow_forward
- *CO 11 of 16 (> Review Constants | Periodic Table Part A HN-HO-HƆ Spell out the full name of the compound. Submit Request Answer Part B H. N. Spell out the full name of the compound. P Pearson Pearson Education Inc. All rights reserved. Terms of Use | Privacy Policy Permissions | Contact Us / 12:14 AM xp ジ 10/29/2020 Delete LEGO Backspace 6.arrow_forwardFrom the data in Table 2.5, compute the concentration of the undiluted and diluted ovalbumin samples (make sure to account for the appropriate dilution factors, DF, in the computation).arrow_forwardThere are 48 pairs of students in the following table. Each pair has quantitatively determined the mass of caffeine in a 355 mL can of the popular energy drink marketed as “GRIME” using Liquid Chromatography-Mass Spectrometry (LC-MS). The class results are presented below. Summarise and report these results including an indication of measurement uncertainty. * Mass of Caffeine (mg) Mass of Caffeine (mg) (Table continued) 208.28 207.54 207.12 206.70 208.54 208.00 208.23 208.49 207.99 206.85 208.74 207.73 206.93 207.27 206.77 208.88 207.55 206.97 208.42 208.65 208.68 208.81 207.59 208.41 207.89 208.42 208.11 206.75 206.49 208.13 207.97 206.79 200.79 208.08 207.69 207.79 207.92 207.85 206.57 208.12 206.89 208.38 207.27 208.15 207.89 206.62 207.71 207.83arrow_forward
- Supply the missing information in the table. (Given in Blue). Answers in scientific notation should be in this sample format >>> 1.0 x 10-14arrow_forwardBriefly define the phrase “fit-for-purpose” in relation to analytical chemistry.arrow_forwarduiz: Final Exam Fall 2022 > с ǝl 2022 Fall A Home asu.instructure.com/courses/129933/quizzes/1010775/take Time in AZ Announcements Modules Pearson Access Grades X + Discussions BryteWave Course Materials Resources Smarthinking Online Tutoring Accessibility Honorlock ASUO ASU Course Policies Expand IG. Question 3 A piece of Na placed into a graduated cylinder of water displaces 22 mL of water. Based on the given densities, what was the mass of the metal put into the container? Density (g/cm³) Metal titanium 4.50 potassium 0.862 manganese 7.44 lead sodium O 21 g O 13 g O 17 g O 9.7 g O 6.3 g 11.3 4 pts 0.968arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you