Homework Week 3

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Question #1

What volume of 2.5% (m/v) KOH can be prepared from 125 mL of a 5.0% KOH solution?

A 63 mL

B 125 mL

C 0.0040 mL

D 250 mL

E 0.10 mL

Question #2

The formation of a gas resulting from the escape of high-energy particles from the surface of a liquid is known as

A melting.

B evaporation.

C boiling.

D sublimation.

E deposition.

Question #3

Which of the following is an example of a physical change?

A burning coal

B converting water to hydrogen and oxygen

C grinding coffee beans

D digesting a cheeseburger

E baking a cake

Question #4

A heating curve illustrates

A the chemical changes that occur as the substance is heated.

B what happens to the particles of a substance as it is heated.

C what happens to the heat applied as the temperature is increased.

D the changes in the temperature and physical state of a substance as it is heated.

E what a substance looks like as it is heated.

Question #5

650. J is the same amount of energy as ________.

A 2720 cal

B 155 cal

C 2.72 cal

D 650. cal

E 1550 cal

Question #6

The physical state(s) present when a substance is melting is (are)

A solid + liquid.

B gas.

C solid.

D liquid + gas.

E liquid.

Question #7

Which of the following is a heterogeneous mixture?

A tea

B noodle soup

C sugar

D carbon

E water

Question #8

On a heating curve a plateau corresponds to

A a change in temperature of a liquid.

B the solid being broken into smaller pieces.

C a change in temperature of a solid.

D a change in temperature of a gas.

E a change of state.

Question #9

An example of kinetic energy is

A natural gas.

B running water.

C a coiled spring.

D chemical energy.

E a tree.

Question #10

What is the concentration, mass/volume percent (m/v), of a solution prepared from 50. g NaCl and 2.5 L of water?

A 0.020%

B 2.0%

C 0.050%

D 20%

E 5.0%

Question #11

Which of the following does not involve a change of state?

A pouring water into a vacuum-insulated bottle

B melting ice

C sublimation of dry ice

D vaporization of alcohol

E freezing water

Question #12

Which of the following quantities is not required to calculate the amount of heat energy required to heat water from 25 °C to 55 °C?

A the mass of the water sample

B the final temperature

C the heat of vaporization for water

D the initial temperature

E the specific heat of water

Question #13

Which of the following is a physical change?

A a tomato ripening

B dry ice subliming

C fermenting grapes to produce wine

D digesting a meal

E baking a cake

Question #14

Coins in a piggy bank are an example of a(n)

A compound.

B heterogeneous mixture.

C homogeneous mixture.

D element.

E none of the above

Question #15

In a gas, the distance between the particles is

A close relative to the size of the molecules.

B very close relative to the size of the molecules.

C fixed relative to the size of the molecules.

D very large relative to the size of the molecules.

E small relative to the size of the molecules.

Question #16

Which one of the following properties describes a liquid?

A fills the entire volume of the container

B particles are close together and move randomly

C has its own shape

D particles move very rapidly

E There is essentially no interaction between the particles.

Question #17

In which of the following would the particles move most rapidly?

A ice at 0 °C

B boiling water

C water at 20 °C

D steam at 110 °C

E ice at -20 °C

Question #18

Gold in a ring is a(n)

A heterogeneous mixture.

B homogeneous mixture.

C compound.

D element.

E none of the above

Question #19

A serving of fish contains 50 g protein and 4 g of fat. If protein has a caloric value of 4 kcal/g and fat has
9 kcal/g, how many kcal are in the serving? Give the answer to 2 significant figures.

A 220 kcal

B 54 kcal

C 470 kcal

D 240 kcal

E 490 kcal

Question #20

If the heat of fusion for water is 80. cal/g, how many calories are needed to melt 45.0 g of ice at 0 °C?

A 80. cal

B 0.56 cal

C 3.6 x 103 cal

D 3.6 cal

E 1.8 cal

Question #21

In water, a substance that ionizes completely in solution is called a

A nonconductor.

B nonelectrolyte.

C weak electrolyte.

D semiconductor.

E strong electrolyte.

Question #22

On a hot day, the thermometer read 95 °F. What is the temperature in degrees Celsius?

A 77 °C

B 113 °C

C 63 °C

D 35 °C

E 178 °C

Question #23

Which of the following would not be a physical change?

A melting gold to make jewelry

B tearing a piece of aluminum foil

C burning gasoline in a lawnmower

D boiling water for soup

E freezing water to make ice cubes

Question #24

The phrase “ability to do work” is a definition of

A specific heat.

B heating.

C calorie.

D energy.

E cooling.

Question #25

In a solution, the solvent

A is the substance present in the smallest concentration.

B can be a solid, liquid, or gas.

C can be a liquid or gas.

D is never a solid.

E is a liquid.

Question #26

The mass percent concentration refers to

A grams of solute in 1 kg of solution.

B grams of solute in 100 g of solvent.

C grams of solvent in 100 g of solution.

D grams of solute in 100 g of solution.

E grams of solute in 1 kg of solvent.

Question #27

The specific heat of a substance is the amount of heat needed to

A change 1 g of the substance from the liquid to the solid state.

B convert 1 g of a liquid to gas.

C convert 1 g of a solid to a gas.

D raise the temperature of 1 g of the substance by 1 °C.

E change 1 g of the substance from the solid to the liquid state.

Question #28

Which of the following is an element?

A tin

B salt

C iced tea

D water

E sugar

Question #29

Which of the following is not a characteristic of the solid state?

A particles are close together

B particles are moving very fast

C particles are in fixed positions

D has a definite shape

E has a definite volume

Question #30

How many calories are required to raise the temperature of a 150. g sample of gold from 25 °C to 175 °C? The specific heat of gold is 0.0308 cal/g °C.

A 130. cal

B 693 cal

C 22500 cal

D 4.62 cal

E 116 cal

Question #31

Helium is a(n)

A heterogeneous mixture.

B element.

C electron.

D homogeneous mixture.

E compound.

Question #32

A temperature of 41 °F is the same as

A 42 °C.

B 16 °C.

C 5 °C.

D -9 °C.

E 310 °C.

Question #33

How many grams of glucose are needed to prepare 400. mL of a 2.0%(m/v) glucose solution?

A 0.0050 g

B 800. g

C 200. g

D 2.0 g

E 8.0 g

Question #34

The temperature of liquid nitrogen is -196 °C. What is the corresponding reading on the Kelvin scale?

A -127 K

B -91 K

C 48 K

D 77 K

E 146 K

Question #35

When some of the sugar added to iced tea remains undissolved at the bottom of the glass, the solution is

A saturated.

B unsaturated.

C nonpolar.

D polar.

E dilute.

Question #36

If the temperature is 20. °C, what is the corresponding temperature on the Fahrenheit scale?

A 94 °F

B 239 °F

C -22 °F

D 43 °F

E 68 °F

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