CHEM115 EXAM 2
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Dec 6, 2023
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CHEM-115
Test 2
-Chapters: 3.7-4
Multiple Choice:
(1 point each)
1.)
What are the numbers called that are written in front of compounds in
chemical equations?
a. prescripts
b. subscripts
c. postscripts
2.)
What chemical equation has the following basic formula: C+C
à
C+C
a. single disp.
b. double disp.
c. decomp.
e. combustion
3.)
What chemical equation has the following basic formula: E+C
à
E+C
b. double disp.
c. decomp.
d. synth.
e. combustion
4.)
What chemical equation has the following basic formula: AB
à
A+B
a. single disp.
b. double disp.
d. synth.
e. combustion
5.)
What chemical equation has the following basic formula: AB+CD
à
CB+AD
a. single disp.
c. decomp.
d. synth.
e. combustion
6.)
What type of reaction uses O
2
to produce CO
2
and H
2
O?
a. single disp.
b. double disp.
c. decomp.
d. synth.
Use the following equation to answer questions 7&8:
H
2
SO
3(aq)
à
H
2
O
(l)
+ SO
2(g)
7.)
On the reactant side of the equation, how many oxygen are there?
a. one
b. two
d. four
e. five
8.)
What do the letters “aq” mean after the H
2
SO
3
?
a. liquid
c. solid
d. gas
Use the following activity series to answer questions 9&10
Most active
à
Li, K, Ca, Na, Mg, Al, Zn, Fe, Ni, Pb, Cu, Ag
ß
Least Active
9.)
Which of the following elements would
NOT
replace Fe in a chemical
reaction?
a. K
b. Ni
c. Ag
d. Li
e. both a+b
f. both c+d
10.) Which of the above elements would allow the following reaction to take
place?
____ + CaO
à
____O + Ca
b. Na
c. Zn
d. Cu
11.) What is defined as the substance that is dissolved, and present in the smaller
amount?
b. the solution
c. the solvent
d. the electrolyte
12.) Saltwater conducts electricity, this conduction is known as what kind of
solution?
a. nonelectrolytic
c. aqueous
d. nonaqueous
13.) Which of the following is a weak acid?
a. HNO
3
b. HCl
d. H
2
SO
4
14.) Which of the following is a weak base?
a. KOH
c. NaOH
d. CH
3
COOH
15.) Which of the following is a triprotic acid?
b. H
2
SO
4
c. HCl
d. CH
3
COOH
Balance the following equations:
Put all final answers on your answer sheet. (2
points each)
Example
à
H
2
+ O
2
--> H
2
O
___ + ___--> ___
2
+ 1 --> 2
1.)
PaI
5
à
Pa + I
2
2.)
Al + H
2
SO
4
à
Al
2
(SO
4
)
3
+ H
2
3.)
ZnO + HCl
à
ZnCl
2
+ H
2
O
4.)
Cr + SnCl
4
à
CrCl
3
+ Sn
5.)
Al + Pb(NO
3
)
2
à
Al(NO
3
)
3
+ Pb
Write and balance the following equations:
Put all final answers on your answer
sheet. (3 points each)
1.)
Hydrogen and bromine make hydrogen bromide
2.)
Sodium and copper (I) chloride make sodium chloride and copper
3.)
Lithium and water make lithium hydroxide and hydrogen
4.) sodium nitrate and lithium chloride makes lithium nitrate and sodium
chloride
2PaIs
22Pa
512
2A
342504
2A
2150473
342
ZnO
2
HCl
22h02
H2O
Hcr
35h04
24043
35h
2AIT3Pb
N3
2
02A
Nz
3Pb
Synthesis
Hat
Bra
o2HBr
single
Displacement
Nat
Cult
Nacl
u
single
Displacement
24
211
20
024
OH
H2
Double
Displacement
NANOSTLICI
Lino
Nacl
STOICHIOMETRY: Show all final work, including your factor-label set up, on
the answer sheet.
Use the following balanced equation for questions 1-3:
(5 points each)
3Ca(OH)
2
+ 2H
3
PO
4
à
Ca
3
(PO
4
)
2
+ 6H
2
O
1.)
If 7.0 moles of H
3
PO
4
react with calcium hydroxide, how many moles of
Ca
3
(PO
4
)
2
will be produced?
2.)
If 5 moles of Ca(OH)
2
are present, how many grams of Ca
3
(PO
4
)
2
will be
produced?
3.)
If 250 grams of water are produced, how many grams of Ca(OH)
2
must have
reacted?
Use the following balanced equation for questions 4-7:
2Al + 3S
à
Al
2
S
3
4.)
If there are 50.0 grams of Al and 65 grams of S available, how many grams of
Al
2
S
3
could be produced from
each
reactant?
5.)
Which of these two reactants is the limiting reactant?
6.)
How much Al
2
S
3
, in grams, could be produced?
7.)
Calculate the reaction percent yield of Al
2
S
3
if 72 grams are actually
produced.
Write and balance the ionic and net ionic equation (if there is one) for each of
the following reactions:
Put your answers on your answer sheet. (4 points each)
1.)
CaCl
2
+ NH
4
OH <--> Ca(OH)
2
+ NH
4
Cl
2.)
Pb(NO
3
)
2
+ Na
2
S --> PbS + 2NaNO
3
3.)
CaBr
2
+ Li
2
SO
4
--> 2LiBr + CaSO
4
Predict the products of the following reactions and balance.
Show the final
balanced equations only on your answer sheet. (3 points each)
1.)
Na
2
O
à
2.)
Cu + AgNO
3
à
3.)
FeS
à
4.)
Ca(OH)
2
+Al(NO
3
)
3
à
5.)
Mg + O
2
à
6.)
C
6
H
16
+ O
2
à
7.)
KBr + Ag Cl
à
8.)
Zn + HNO
3
à
9.)
F
2
+ NaCl ->
10.) Na + Cl
2
à
calcium
Hydroxide
calcium
phosphate
phosphoric
Acid
Aluminum
Sulfide
Decomposition
Single
Displacement
Decomposition
Double
Displacement
Synthesis
Combustion
Double
Displacement
Single
Displacement
single
Displacement
synthesis
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Concentration and dilution:
Show your set up and calculations for the following
problems: (4 points each)
1.)
How many grams of KOH are present in 35 mL of a 5.50
M
solution.
2.)
What is the molarity of a CaCl
2
solution if 10.4 grams are dissolved in 220 mL
of water
3.)
You have 505 mL of a 0.125
M
HCl solution and you want to dilute it to
exactly 0.100
M
. How much water should you add?
Name:_____________________________________________
Test 2: Chapters 3.7-4
Multiple Choice:
(1 point each)
1. a
b
c
d
9. a
b
c
d
e
f
g
2. a
b
c
d
e
10. a
b
c
d
3. a
b
c
d
e
11. a
b
c
d
4. a
b
c
d
e
12. a
b
c
d
5. a
b
c
d
e
13. a
b
c
d
6. a
b
c
d
e
14. a
b
c
d
7. a
b
c
d
e
15. a
b
c
d
8. a
b
c
d
Balancing Equations: (2 points each)
1.)
_____
à
_____ + _____
2.)
_____ + _____
à
_____ + _____
3.)
_____ + _____
à
_____ + _____
4.)
_____ + _____
à
_____ + _____
5.)
_____ + _____
à
_____ + _____
Writing and balancing equations: (3 points each)
1.)
2.)
3.)
4.)
i
i
2
2
5
2
3
1
3
I
2
I
I
4
3
4
3
2
3
2
3
Hz
Brz
2HBr
NatCull
Nacht Cu
211
2420
2LLiOHtH2
NANO
Lid
oLiNOztNacl
STOICHIOMETRY:
(5 points each)
3Ca(OH)
2
+ 2H
3
PO
4
à
Ca
3
(PO
4
)
2
+ 6H
2
O
1.)
2.)
3.)
2Al + 3S
à
Al
2
S
3
4.)
5.)
6.)
7.)
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Write and balance the ionic and net ionic equation: (4 points each)
1.) Ionic:
Net Ionic:
2.) Ionic:
Net Ionic:
3.) Ionic:
Net Ionic:
Predict the products and balance:
(3 points each)
1.)
2.)
3.)
4.)
5.)
Ca42t2NHyOH
C
CALONTINHYU
Cat
LCI
2NHyt
LOH
o
Ca't
LOH
2N
LET
NIA
Pb
NO
ztNazS
opbsttLNanoz
Pb
2NO5
2Natts
I
2Natt2NO5
Pbs
is
Pb't
Stopbsis
CaBrtLizS04
22librtCasout
CaH
2BFt2Lit
504
021112135
09504
s
Catt
504
2950467
2Nd
20
02Nd
2
02
Cut
Agno
CUNO
Ag
Fes
o
Fets
3Ca
OH
ZAI
NO
23cal
NO
zt2A
OH
2mg
02
02m90
6.)
7.)
8.)
9.)
10.)
Concentration and dilution:
(4 points each)
1.)
2.)
3.)
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H2(g)
X
STARTING AMOUNT
ADD FACTOR
ANSWER
RESET
*( )
2.40
21.6
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- 9. How many moles of carbon dioxide are produced in the reaction between hydrochloric acid and calcium carbonate when 2 moles of HCl are used to start with? All cha 2HCI-CaCO3 CaCl2 + CO2 + H,0 O 4 3 1. PREVIOUS 9 of 16 NEXT SAVE US Cip esc Ce # % 7arrow_forwardalibri (Body) 12 A A Aa v AaBbCcDc AaBbCcDc AaBbC AABBCCC AaB AABBCCD IU abe x, x A ab T Normal T No Spac. Heading 1 Heading 2 Title Subtitle Font Paragraph Styles 3 6 IZICIt iniED 10 11 12 13 I 14 I- 15 16 . Chemical Equation Write a balanced equation that describes each of the following chemical reaction. 1. Acetylene gas, C2H2, burns in air forming gaseous carbon dioxide and, CO2, and water. Answer: 2C2H2 + 502 → 4CO2 + 2H20 (double displacement/Combustion reaction) 2. MnO2 + KOH + O2 → H20 + K2MNO4 3. FeCl2 + Cl2 → FeCl3 English (United States) Accessibility: Good to go a ENG REDMI NOTE 10 PRO | JHANG 01/06/2022 15: 12arrow_forwarda. 8. b. OH Fill in the starting material for the following reaction. ? 1. NaOH 2. HgO+ 人無 3. Hy / Raney Ni C. . Br d. 己 e. 己 OHarrow_forward
- A A Aa A AaBbCcL AaBbCcI AaBbCcI AaBbC AaBbC A P. A. 1 Caption 1 Normal 1 No Spac. Heading 1 Title Paragraph Styles 3 Moles of KHC,H,O, (mol) 4 Buret Reading of NaOH, initial (mL) 5 Buret Reading of NaOH, f hal (mL) 6 Volume of NaOH dispensed (mL) 7 Molar Concentration of NaOH (mol/L) 8 Average molar concentration of NaOH (mol/L) 9 Standard deviation 10 Relative standard deviation (%RSD) 50.00 35.00 50.00 34.00 50.00 36.00 (~0.16 M) B. Molar Concentration of an Acid Solution Acid type (enter "1" for monoprotic and "2" for diprotic) Unknown No. 1 Sample 3 25.00 Sample 2 25.00 50.00 29.50 Sample 1 1 Volume of acid sample (mL) 2 Buret Reading of NaOH, initial (mL) 3 Buret Reading of NaOH, f hal (mL) 4 Volume of NAOH dispensed (mL) 5 Average molar concentration of NaOH (mol/L) 6 Moles of NaOH dispensed (mol) 7 Molar concentration of acid solution (mol/L) 8 Average molar concentration of acid solution (mol/L) 9 Standard deviation 10 Relative standard deviation (%RSD) 25.00 (sugg. 25.00 r…arrow_forwardWhat is the theoretical yield of aspirin and the percent yieldarrow_forwardReaction B.arrow_forward
- 7. Use the reaction given to solve the next problems. Show all units. Al203 + 6Na ---> 3Nª2O +2Al a. 2 moles of Al203 will produce. moles of Al. Show all units, b. 5 moles of Na will require. moles of Al203. Show all units. c. 23.0 grams of sodium will produce moles of Na20. Show all units. d. 69.0 grams of sodium will produce grams of Al. Show all units. e. 24.6 moles of aluminum oxide will produce grams of sodium oxide. Show all units. f. 15.3 grams of Na2O will be produced by moles of sodium. Show all units.arrow_forwardWhat is a calibration curve? (select the BEST description) A calibration curve is a serial dilution. O a. O b. A calibration curve is a graph that gives information. O c. A calibration curve is a method for determining the concentration of an unknown sample by comparing the unknown to a set of standard samples of known concentration. When using FerroZineM to determine the concentration of iron, how many moles of FerroZineTM are needed to complex 3.6x107 mol of iron? Answer:arrow_forwardEndow Help eq req Ereg Important values if needed... | b... q eq MAY 11 Submit Answer prod01-cnow-owl.cengagenow.com S 5 According to the following reaction, how many moles of bromine monochloride will be formed upon the complete reaction of 0.915 moles bromine with excess chlorine gas? Br2(g) + Cl₂ (g) → 2BrCI(g) mol bromine monochloride Retry Entire Group ty A 6 [Review Topics] [References] Use the References to access important values if needed for this question. Module 2 | OWLv2 MacBook Pro & 7 8 more group attempts remaining GA * CO 8 A :)) O 9 COWLV2 | Online teaching and learning resource from C.... Previous 00 Email Instructor Thu May 11 Next Save and Exit 0 HARB 0 + C ?arrow_forward
- Pls. Helparrow_forwardFill in the following table with the correct information. NaHCO, 3 Mg(HCO,)2 4 Magnesium phosphate Sodium 2 phosphate a.1. Sodium carbonate; 2. Magnesium carbonate; 3. Na,PO,; 4. M9PO4 b.1. Sodium hydrogen carbonate; 2. Magnesium bicarbonate; 3. Na,PO4; 4. Mg3(PO,)2 c.1. Sodium hydrogen carbonate; 2. Magnesium bicarbonate; 3. Na(PO4)3; 4. Mg;PO4 d.1. Sodium hydrogen carbonate; 2. Magnesium bicarbonate; 3. NAPO4; 4. Mg3(PO4)2 Return opyright 2016 Cengage Learning. All Rights Reserved.arrow_forwardX Bb Pearson's MyLab & Mastering - 2X 3.8 Formula Mass and the Mole b Calculate the number df moles in x MasteringChemistry: Chapter 3 X X session.masteringchemistry.com/myct/itemView?assignmentProblemID=128518634&0ffset=next W Chapter 3 Exercise 3.62 - Enhanced - with Feedback 14 of 20 Review | Constants Periodic Table You may want to reference (Pages 107 - 110) Section 3.8 while completing this problem. Calculate the mass of each sample. Part A 19.6 mol ΗΝΟ 3 Express your answer with the appropriate units. ? HA η (HNO. ) - 1431 g Previous Answers Request Answer Submit XIncorrect; Try Again; 4 attempts remaining 12:08 PM е Type here to search 9/29/2019arrow_forward
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