HW 3

3.106 A metal is thought to be copper or gold. When 18 g of the metal absorbs 58 cal, its temperature rises by 35 °C. (3.6)

5 (2.74) The carat is the unit of mass used by jewelers. One carat is exactly 200mg. How many carbon atoms are present in a 2.5 carat dimond? Write the answer to the correct significant figures

A heated lead ball is added to 158 grams of water in a coffee cup calorimeter.  If the ball loses 47.35 °C of heat and the water gains 1.3 °C of heat, what is the mass of the lead ball? (3 sf)

How many different chemical compounds are in the gas phase? 2. 3. 4.

None

A sample is put into 400-mL of water. It releases 58.829 kJ of heat energy when it is combusted. What was the temperature change of the water during this combustion? (1:3)

4.2 The density of a sample of poly(ethylene terephthalate), PET, is measured to be 1.468 g/cm³. A. What fraction of this PET is amorphous? B. What is the density of a PET sample that is 45% crystalline? The density of amorphous PET has been reported to be 1.336 g/cm³ and crystalline PET as 1.514 g/cm³. 4.3 Two copolymers were synthesized that contain 42 wt% polyethylene and 58 wt% polypropylene. The first polymer is rigid and opaque, while the second is soft and transparent. Give two plausible explanations of the difference in properties despite the copolymers having the same composition (and molecular weight). {I have three possible answers} 4.4 Traditional materials science textbooks (like used in MTE 271, if you took that class) are concerned mostly with metals and ceramics instead of polymers. There is a great deal of discussion about crystal structures (such as fcc or face-centered cubic atomic arrangements in crystals, etc.) and crystal defects in these books. While there are…

(1.3)Which of the following techniques can separate the homogeneous mixture of two liquids with different boiling points? O All of these O decanting O filtration O distillation

(1.7) A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.71 g/mL, 1.72 g/mL, 1.71 g/mL, 1.70 g/mL. If the actual value for the density of the sugar solution is 1.50 g/mL, which statement below best describes her results? O Her results are accurate, but not precise. O Her results are precise, but not accurate. O Her results are both precise and accurate O Her results are neither precise nor accurate.

(3.6)Write the systematic names of compounds with lowercase letters except Roman Numerals. Roman number should be written with capital letters (I, II, III, IV, etc.). There should be no space between the end of the name of the metal and the parentheses with the Roman numeral. Example: CuO copper(II) oxide H₂CrO4(aq) SO3 acer H₂S(aq) FeN Sn3(PO3)2 1080

Question 32

(1.3)(Question 42 on page 40) Which of the following represent(s)' homogeneous mixture'? (a) (b) (d) (c) O (a) and (c) O (a) O (b) O (c) and (d) O (b), (c) and (d)

Titanium has a density of 4.55 g/mL. A piece of titanium has a volume of 250.0 mL. What mass, in grams, does this piece of titaniun have?

9:39 PM Fri 17 May USING PARTICLE DIAGRAMS in CLASSIFYING MATTER Fill in the information needed in the table. Does the particle diagram represent an element, a compound or a mixture thereof? Do the particles represent an atom, a molecule, an ion or a formula unit? Does it represent a gas, a liquid or a solid? Is it homogeneous or heterogeneous? Particulate Diagram Composition of Matter Particle of Matter State / Phase Homogeneity C A B E ... Worksheet 1-01 22 Particulate Diagram Composition of Matter Particle of Matter State/ Phase Homogeneity G H J K 47% 23

Three sections of the periodic table are labeled A, B, and C in the image below. Which of the following statements is most likely true for an element present in section A?

A student sets up and solves the following equation to solve a problem in solution stoichiometry. Fill in the missing part of the student's equation. (0.37) 1 mL 10 109.85 g mol 2.17 mL = 7.3 mol x10 0.0 X μ 0|0 4

6:59 PM Thu Sep 21 STARTING AMOUNT here or pull up for additional resources 1 Q A X 2 W S #3 E D Ascorbic acid (C₂H₂O) is also known as Vitamin C. What quantity in molecules of C₂H₂O does a Vitamin C drink with 1025 mg C₂H₂O contain? ADD FACTOR 6.022 x 1023 x( ) 2.925 x 1022 2.925 x 10-22 4 $ R 100 1025 3.505 x 10-² 176.12 F % 5 T Question 9 of 21 G 1000 6 5.68 x 10-³ 0.001 mg C₂H₂O₂ g C₂H₂O molecules C₂H₂O₂ mol C₂H₂O g/mol C₂H₂O. ANSWER 3.505x 1024 2.925 x 10- 88.07 Y 0.010 & 7 U RESET 3.505 x 10¹¹ 5.68 x 102⁰ 2.925 x 10% 2.925 x 10 6.022 x 10²² 2 8 H J ( 1 9 O KL P ¡ { LTE C W

13. A sample of 15.00 g of a hydrated sodium sulfate salt contains 7.05 g of water. The value of the "x" in the hydrated salt is:  NaSO4 . xH2O    Answers:  a)7  b)10  c)1  d)3  e)5

Liquid mercury is commonly shipped (when permitted) in iron flasks that contain 75 lbs of mercury. Will this amount of mercury fit into a vessel with a volume of 2.50 quarts? (12) Density of mercury = 13.6 g/cm³, 453.6 g = 1 lb, 1 mL = 1 cm³, 1L = 1.06 qt.

Analytical chemist from Petroleum Development Oman extracted petroleum from crude oil and measured the quantity lost by the extraction to tell how much of the petroleum was . Quantity of Petroleum lost %): 10.8, 11.6, 9.4, 7.8, 9.2, 9.1 , 10.6, 11.6 Should the value 7.8 be rejected from the set of the above results.

Which curve represents the equation: y = 2(0.5)x ?   Question 4 options:   3   4   2

Use the following information to answer the next question: Mass of aluminum calorimeter: 470.0 g Mass of calorimeter water: 100.0 g Initial temperature of calorimeter water: 23°C Mass of silicon: 52.0 g Initial temperature of silicon: 61.6°C Final temperature of calorimeter, water, and silicon: 24.6°C The amount of ennergy lost by silicon in the experiment is? (Answer: 1.35 kJ)

what is the mass, in grams, of 4.224 liters of gasoline (0.670)

Elements, Compounds, and Mixtures Classify each of the pictures below by placing the correct label in the blanks below: A= Element B= Compound C= Mixture of elements D= Mixture of compounds E= Mixture of elements and compounds Each circle represents an atom and each different color represents a different kind of atom. If two atoms are touching then they are bonded together. 8. 1) 3) 5) 6). 8 8) 9) 10) 11) 12) 13) 14) 15)