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 0.10 mL

B 125 mL

C 63 mL

D 0.0040 mL

E 250 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 boiling.

B melting.

C evaporation.

D sublimation.

E deposition.

Question #3

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

A burning coal

B grinding coffee beans

C digesting a cheeseburger

D converting water to hydrogen and oxygen

E baking a cake

Question #4

A heating curve illustrates

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

B what a substance looks like as it is heated.

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

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

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

Question #5

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

A 155 cal

B 2.72 cal

C 2720 cal

D 1550 cal

E 650. cal

Question #6

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

A gas.

B liquid + gas.

C solid + liquid.

D liquid.

E solid.

Question #7

Which of the following is a heterogeneous mixture?

A sugar

B tea

C carbon

D noodle soup

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 of state.

D a change in temperature of a solid.

E a change in temperature of a gas.

Question #9

An example of kinetic energy is

A chemical energy.

B a tree.

C a coiled spring.

D running water.

E natural gas.

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 5.0%

B 2.0%

C 20%

D 0.020%

E 0.050%

Question #11

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

A vaporization of alcohol

B freezing water

C sublimation of dry ice

D pouring water into a vacuum-insulated bottle

E melting ice

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 specific heat of water

C the heat of vaporization for water

D the final temperature

E the initial temperature

Question #13

Which of the following is a physical change?

A a tomato ripening

B digesting a meal

C baking a cake

D fermenting grapes to produce wine

E dry ice subliming

Question #14

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

A element.

B heterogeneous mixture.

C homogeneous mixture.

D compound.

E none of the above

Question #15

In a gas, the distance between the particles is

A fixed relative to the size of the molecules.

B small relative to the size of the molecules.

C close relative to the size of the molecules.

D very large relative to the size of the molecules.

E very close 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 There is essentially no interaction between the particles.

E particles move very rapidly

Question #17

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

A water at 20 °C

B ice at -20 °C

C boiling water

D steam at 110 °C

E ice at 0 °C

Question #18

Gold in a ring is a(n)

A heterogeneous mixture.

B homogeneous mixture.

C element.

D compound.

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 54 kcal

B 240 kcal

C 490 kcal

D 220 kcal

E 470 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 3.6 cal

B 3.6 x 103 cal

C 0.56 cal

D 1.8 cal

E 80. cal

Question #21

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

A strong electrolyte.

B weak electrolyte.

C nonelectrolyte.

D nonconductor.

E semiconductor.

Question #22

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

A 113 °C

B 35 °C

C 178 °C

D 77 °C

E 63 °C

Question #23

Which of the following would not be a physical change?

A tearing a piece of aluminum foil

B melting gold to make jewelry

C boiling water for soup

D burning gasoline in a lawnmower

E freezing water to make ice cubes

Question #24

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

A energy.

B specific heat.

C cooling.

D calorie.

E heating.

Question #25

In a solution, the solvent

A is a liquid.

B can be a liquid or gas.

C can be a solid, liquid, or gas.

D is never a solid.

E is the substance present in the smallest concentration.

Question #26

The mass percent concentration refers to

A grams of solute in 100 g of solvent.

B grams of solute in 1 kg of solvent.

C grams of solute in 1 kg of solution.

D grams of solute in 100 g of solution.

E grams of solvent in 100 g of solution.

Question #27

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

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

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

C convert 1 g of a liquid to gas.

D convert 1 g of a solid to a gas.

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

Question #28

Which of the following is an element?

A sugar

B iced tea

C tin

D water

E salt

Question #29

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

A particles are moving very fast

B particles are close together

C has a definite shape

D has a definite volume

E particles are in fixed positions

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 116 cal

B 4.62 cal

C 130. cal

D 693 cal

E 22500 cal

Question #31

Helium is a(n)

A element.

B compound.

C electron.

D heterogeneous mixture.

E homogeneous mixture.

Question #32

A temperature of 41 °F is the same as

A 42 °C.

B 16 °C.

C 310 °C.

D -9 °C.

E 5 °C.

Question #33

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

A 8.0 g

B 200. g

C 0.0050 g

D 800. g

E 2.0 g

Question #34

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

A 48 K

B -127 K

C 146 K

D -91 K

E 77 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 nonpolar.

C polar.

D unsaturated.

E dilute.

Question #36

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

A -22 °F

B 43 °F

C 94 °F

D 68 °F

E 239 °F

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