Matter, Measurements, and Calculations

Question 1

The mass of an object is

Select one:

a. the force between the object and the earth.
b. a measure of the amount of matter in the object.
c. the amount of space the object occupies.
d. depends on the location of the object on the earth.

Answer 1

b. a measure of the amount of matter in the object.

Question 2

Which of the following represents a physical change in matter?

Select one:

a. A substance melts when heated.
b. A substance gives off a gas when heated.
c. A substance burns when heated.
d. A substance remains unchanged as it is heated.

Answer 2

a. A substance melts when heated.

Question 3

Which of the following is a physical property of matter?

Select one:

a. it does not burn
b. produces a gas when placed in an acid
c. freezes at -10F
d. the surface turns black in air

Answer 3

c. freezes at -10F

Question 4

The limit of chemical subdivision of an element is the

Select one:

a. atom.
b. molecule.
c. proton.
d. compound.

Answer 4

a. atom.

Question 5

Molecules that contain only one kind of atom
Select one:
a. heteroatomic moledcules
b. homoatomic molecules 
c. compounds
d. mixtures

Answer 5

b. homoatomic molecules

Question 6

The basic unit of length in the metric system is the

Select one:

a. mil.
b. millimeter.
c. foot.
d. meter.

Answer 6

d. meter.

Question 7

Which of the following is a derived unit of the S.I. system?

Select one:

a. kilogram
b. meter
c. liter
d. mole

Answer 7

c. liter

Question 8

How many significant figures are justified in a measurement of a length that is between 10 and 11 cm, if the measuring device (ruler) has smallest divisions of 0.01 cm?

Select one:

a. one
b. two
c. three
d. four

Answer 8

d. four

Question 9

How is the weight of an object influenced when the gravitational force on the object is increased?

Select one:

a. the weight decreases
b. the weight increases
c. the weight is unchanged
d. the weight equal to the mass

Answer 9

b. the weight increases

Question 10

The fact that gold does not corrode is a

Select one:

a. physical property.
b. personal property.
c. real property.
d. chemical property.

Answer 10

d. chemical property.

Question 11

Which of the folowing is a chemical property of matter?

Select one:

a. color
b. density
c. freezing point
d. flammability

Answer 11

d. flammability

Question 12

Which of the following terms correctly applies to a molecule of CO2?

Select one:

a. triatomic, heteroatomic
b. polyatomic, diatomic
c. triatomic, homoatomic
d. diatomic, heteroatomic

Answer 12

a. triatomic, heteroatomic

Question 13

The prefix centi-denotes what fraction of a basic unit?

Select one:

a. 1/10
b. 1/100
c. 1/1000
d. 1000

Answer 13

b. 1/100

Question 14

The fact that iron (Fe) corrodes when exposed to water and air is a

Select one:

a. physical property.
b. metal property.
c. chemical property.
d. real property.

Answer 14

c. chemical property.

Question 15

How can the volume of an irregular unknown object be measured?

Select one:

a. using a ruler to measure length, width, and depth
b. measuring the volume of water displaced by the object
c. obtaining the mass of the object
d. measure the radius and use V=πr

Answer 15

b. measuring the volume of water displaced by the object

Question 16

Convert a temperature of 76 degrees F to a Celsius value.

Select one:

a. 10.2
b. 24.4
c. 42.2
d. 44.2

Answer 16

b. 24.4

Question 17

Do the following calculation and express the answer using the correct number of significant figures.

(342) x (0.0012) ÷100.0

Select one:

a. 0.00410
b. 0.0041
c. 4.10 x 10-3
d. 0.004104

Answer 17

b. 0.0041

Question 18

Do the following calculation. How many significant figures are justified for the answer?

5.02 + 6.119 + 0.04117

Select one:

a. four
b. three
c. five
d. seven

Answer 18

a. four

Question 19

If urine has a density of 1.08 g/mL, what would the mass of a 125 mL urine sample?

Select one:

a. 135 g
b. 0.00864 g
c. 116 g
d. 125 g

Answer 19

a. 135 g

Question 20

Suppose the speedometer in your car reads 55.0 mph. What is your speed in km/hr? 1 km = 0.621 miles.

Select one:

a. 34.1
b. 0.029
c. 88.6
d. 0.011

Answer 20

c. 88.6

Question 21

Which of the following numbers is correctly expressed using scientific notation?

Select one:

a. 3489
b. 5.248 x 104
c. 45.78 x 105
d. 0.0987 x 103

Answer 21

b. 5.248 x 104

Question 22

If a student completes 5 lab experiments out of a total of 8 lab experiments, what percentage of experiments was completed?

Select one:

a. 16.0
b. 6.25
c. 0.625
d. 62.5

Answer 22

d. 62.5

Question 23

If 13% of a class cheats on an exam and there are 93 students in the class, how many students should you recommend be expelled (to the nearest whole student)?

Select one:

a. 9
b. 11
c. 12
d. 15

Answer 23

c. 12

Question 24

A hiker began a hike with a full pint canteen of water. One pint equals 16 fluid ounces. At the end of the hike, 7.0 ounces of water remained. What percent of the water was used during the hike?

Select one:

a. 78
b. 44
c. 56
d. 13

Answer 24

c. 56

Question 25

Eighteen students in a class will get this question correct. If that represents 45% of the class, how large is the class?

Select one:

a. 20
b. 40
c. 60
d. 100

Answer 25

b. 40