Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a fixed ratio.

Question 2

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Hot fudge sundae

Question 3

A sample of matter has a definite volume but takes the shape of its container. Which state of matter is this?

Accepted Answer

Liquid

Question 4

Which of the following is a chemical change?

Accepted Answer

Burning a candle

Question 5

Convert a body temperature of $$39.0\ ^\circ \mathrm{C} to $$degrees Fahrenheit using the formula $$F = 1.8C + 32. $$What is the result?

Accepted Answer

$$102.2\ ^\circ \mathrm{F}$$

Question 6

Which of the following statements about the Kelvin temperature scale is correct?

Accepted Answer

Its units are the same size as Celsius degrees.

Question 7

A 24.8 g sample of metal absorbs 275 J of energy, causing its temperature to rise from $$21.5\ ^\circ \mathrm{C} to$$ $$48.1\ ^\circ \mathrm{C}. $$What is the specific heat ($$c) of $$the metal? Use the formula $$q = mc\Delta T.$$

Accepted Answer

$$0.42\ \mathrm{J}/\mathrm{g}^\circ \mathrm{C}$$

Question 8

How many kilocalories are in a cup of whole milk containing 13 g of carbohydrate, 9.0 g of fat, and 9.0 g of protein? (Use: 4 kcal/g for carbohydrate and protein, 9 kcal/g for fat.)

Accepted Answer

170 kcal

Question 9

Which process is an example of sublimation?

Accepted Answer

Dry ice changing directly from solid to gas

Question 10

How much heat (in joules) is required to melt 32.0 g of ice at $$0\ ^\circ \mathrm{C}$$? (Heat of fusion for water is $$334\ \mathrm{J}/\mathrm{g}.)$$

Accepted Answer

$$10,688\ \mathrm{J}$$

Question 11

A plateau (horizontal line) on a heating curve represents:

Accepted Answer

A constant temperature and a change of state

Question 12

Which of the following is an example of kinetic energy?

Accepted Answer

Rollerblading

Question 13

How many calories are equivalent to 150 J of energy? (1 cal = 4.184 J)

Accepted Answer

36 cal

Question 14

Which of the following best describes a physical property?

Accepted Answer

A magnet removes iron particles from a mixture

Question 15

When 50.0 g of steam at $$100\ ^\circ \mathrm{C}$$ condenses to liquid water at $$100\ ^\circ \mathrm{C}$$, how much energy is released? (Heat of vaporization for water is $$2260\ \mathrm{J}/\mathrm{g}.)$$

Accepted Answer

$$113,000\ \mathrm{J}$$

Question 16

Which of the following statements about mixtures is correct?

Accepted Answer

Mixtures can be separated by physical methods.

Question 17

Which of the following is a real-life application of the high specific heat of water?

Accepted Answer

Water helps moderate coastal climates.

Question 18

A patient’s temperature is $$38.5\ ^\circ \mathrm{C}. $$What is this temperature in Kelvin? (Use $$K = ^\circ \mathrm{C} + 273)$$

Accepted Answer

$$311.5\ \mathrm{K}$$

Question 19

Which of the following is NOT a physical change?

Accepted Answer

Iron rusting

Question 20

Which of the following best describes potential energy?

Accepted Answer

Energy stored in chemical bonds

Chapter 3: Matter and Energy – GOB Chemistry Study Notes

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