Question 1

What is the number 0.9050 written in scientific notation using the proper number of significant figures?

Accepted Answer

A) 0.9 × 104 
B) 9 × 10−1 
C) 9.05 × 10−1 
D) 9.050 × 104 
E) 9.050 × 10−1

Question 2

What volume, in milliliters, will 2.00 g of air occupy if the density is 1.29 g/L?

Accepted Answer

A) 2.72 × 103 mL 
B) 2.20 mL 
C) 1.43 mL 
D) 1.55 × 103 mL 
E) 4.59 × 102 mL

Question 3

Which of the following terms best describes the sample of matter in the diagram? Note: different colored circles represent atoms of different elements.

Accepted Answer

A) homogeneous mixture 
B) pure substance 
C) heterogeneous mixture 
D) solution 
E) None of the choices are correct.

Question 4

When hydrogen (H2) and chlorine (Cl2) gases are mixed, hydrogen chloride (HCl) is produced.Hydrogen chloride is classified as what type of matter?

Accepted Answer

A) an element 
B) a compound 
C) a homogeneous mixture 
D) a heterogeneous mixture 
E) a solution

Question 5

NaCl is best classified as a/an

Accepted Answer

A) pure substance. 
B) element. 
C) compound. 
D) homogeneous mixture. 
E) Both pure substance and compound are correct.

Question 6

What kind of change always results in the formation of new materials?

Accepted Answer

A) molecular 
B) exothermic 
C) endothermic 
D) physical 
E) chemical

Question 7

Tire pressure in the U.S.is measured in lb/in2.Convert 25 lb/in2 to g/cm2.454 g = 1 lb, 2.54 cm = 1 in

Accepted Answer

A) 0.39 g/cm2 
B) 1.8 × 103 g/cm2 
C) 4.7 × 103 g/cm2 
D) 3.0 × 104 g/cm2 
E) 2.4 × 102 g/cm2

Question 8

In which state of matter are forces between particles least dominant?

Accepted Answer

A) solid 
B) liquid 
C) gas 
D) All of the choices are correct. 
E) None of the choices are correct.

Question 9

Density and specific gravity can be expressed in the same units.

Accepted Answer

A) True 
 B)False

Question 10

What is a hypothesis?

Accepted Answer

A) a fact that results from extensive experimentation and testing 
B) the summary of a large quantity of information 
C) the result of a single measurement or observation 
D) an attempt to explain an observation, or a series of observations 
E) an observation of a chemical reaction

Question 11

Which of the following is an example of physical change?

Accepted Answer

A) boiling water 
B) burning paper 
C) a metal losing electrons to become a cation 
D) cooking eggs 
E) lighting a match

Question 12

The area of a rectangle is determined by the formula: area = length × width.If a rectangle has a length of 32.6 cm and a width of 72.6 cm, what is the area of the rectangle to the correct number of significant figures?

Accepted Answer

A) 2,400 cm2 
B) 2,370 cm2 
C) 2,367 cm2 
D) 2,366.8 cm2 
E) 2,366.76 cm2

Question 13

1 centimeter equals how many millimeters?

Accepted Answer

A) 10-6 
B) 10-3 
C) 10 
D) 104 
E) 106

Question 14

How many centimeters correspond to 15.68 kilometers?

Accepted Answer

A) 1.568 × 106 cm 
B) 1.568 × 105 cm 
C) 1.568 × 10-4 cm 
D) 1568 cm 
E) 1.569 cm

Question 15

A bolder at the top of a hill breaks free and rolls down the hill.Which statement best represents the change in energy that occurs in this process?

Accepted Answer

A) The potential energy of the bolder increases. 
B) The potential energy of the bolder is converted to kinetic energy. 
C) The kinetic energy of the bolder is converted to potential energy. 
D) The chemical energy of the bolder is converted to kinetic energy. 
E) No change in energy occurs; energy cannot be converted from one form to another.

Question 16

Which branch of science primarily involves the study of matter and the changes it undergoes?

Accepted Answer

A) biology 
B) technology 
C) physics 
D) chemistry 
E) All of the choices are correct.

Question 17

What is the basic unit of volume in the metric system?

Accepted Answer

A) milliliter 
B) cubic centimeter 
C) liter 
D) gram 
E) millimeter

Question 18

Each piece of data is the individual result of a single measurement.

Accepted Answer