Name:    Practice Test 1A

Multiple Choice
Identify the choice that best completes the statement or answers the question.

1.

3.914 cm + 243.10 cm + 12.0046 cm =
 A) 259.0186 cm B) 259.019 cm C) 259.0 cm D) 259.02 cm

2.

The energy associated with the motion of particles in a substance is called
 A) potential energy B) chemical energy C) heat D) temperature

3.

When a solid is converted directly to a gas, the change of state is called
 A) sublimation B) condensation C) freezing D) fusion

4.

How many significant figures does the measurement 0.00480 cm contain?
 A) 2 B) 4 C) 5 D) 3

5.

Brass is an example of
 A) an element B) a homogeneous mixture C) a compound D) a heterogeneous mixture

6.

The temperature of 42.0 °C is equivalent to
 A) 231 K B) 53.3 °F C) 5.55 °F D) 108 °F

7.

Express 0.00382 in scientific notation.
 A) 3.82 x 103 B) 0.382 x 10–2 C) 3.82 x 10–2 D) 3.82 x 10–3

8.

The number 43250 when rounded to three significant figures would appear as
 A) 433 B) 43300 C) 43000 D) 43200

9.

One cup of kidney beans contains 15 g of protein, 1 g of fat, and 42 g of carbohydrate.  How many Calories (2 sig figs) does this sample contain? (The caloric values are:  4 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.)
 A) 60 B) 520 C) 240 D) 88

10.

Which of the following is NOT a characteristic of solutions?
 A) variable composition B) a homogeneous mixture C) a heterogeneous mixture D) contains two or more substances

11.

The state of matter that lacks definite volume is
 A) gas B) solid C) gas and liquid D) liquid

12.

On a heating curve a plateau corresponds to
 A) a change in temperature of a solid. B) a change in temperature of a liquid. C) a change of state. D) a change in temperature of a gas.

13.

When 20.0 g of mercury is heated from 10.0 °C to 20.0 °C, 27.6 J of energy are absorbed.  What is the specific heat of mercury?
 A) 2.76 J/g°C B) 0.726 J/g°C C) 552 J/g°C D) 0.138 J/g°C

14.

37.4 cm x 2.2 cm equals
 A) 82 cm2 B) 82.3 cm2 C) 82.28 cm2 D) 82.2 cm2

15.

The specific heat of aluminum is 0.9 J/g°C.  How many joules of energy are required to raise the temperature of 20 g of aluminum from 10 °C to 15 °C? (Ignore significant figures for this question)
 A) 90 J B) 100 J C) 112 J D) 79 J

16.

The mass of a block is 9.43 g and its density is 2.35 g/cm3.  The volume of the block is
 A) 22.2 cm3 B) 2.49 cm3 C) 0.249 cm3 D) 4.01 cm3

17.

If the heat of fusion for water is 80. cal/g, how many kcals are needed to melt 45.0 g of ice at 0 °C?
 A) 1.8 B) 3.6 C) 3600 D) 0.56

18.

A theory is
 A) a law that is yet to be tested and validated. B) a hypothesis that has been tested and validated over a long period of time. C) a hypothesis that is yet to be tested and validated. D) a law that has been tested and validated by several scientific organizations.