Question 1

Which of the following is an example of a chemical property?

Accepted Answer

Iron rusts when exposed to oxygen.

Question 2

Which of the following best describes a scientific law?

Accepted Answer

A summary of many observations that predicts future events.

Question 3

A student observes that when a match burns, heat is released. This statement is best classified as:

Accepted Answer

An observation

Question 4

Which of the following is a heterogeneous mixture?

Accepted Answer

Vegetable soup

Question 5

Which of the following is NOT a technological advancement made possible by understanding chemistry?

Accepted Answer

The ability to change lead or other metals into gold

Question 6

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 7

A nugget has a mass of $$2.25 	imes 10$$^{-2}$$ kg and a volume of 2.38$ cm^3$. What is its density in g/cm^3$?

Accepted Answer

$$9.45$$ $$g/cm^3$

Question 8

Which of the following statements about the scientific method is FALSE?

Accepted Answer

A scientific law explains why phenomena occur.

Question 9

Convert $$1245 kg to $$milligrams (mg).

Accepted Answer

$$1.245 	imes 10^9$ mg

Question 10

Which of the following is a chemical change?

Accepted Answer

Iron rusting

Question 11

Which of the following substances is a compound?

Accepted Answer

CuO

Question 12

A box measures $$1.2$$ inches in width, $$6.5 cm in $$length, and $$27 mm in $$height. What is the volume in cubic meters ($$m^3$$)? (1 inch = 2.54 cm)

Accepted Answer

$$2.1 	imes 10$$^{-5}$$ m^3$

Question 13

Which of the following is a pure substance?

Accepted Answer

Aluminum

Question 14

Which of the following is the correct formula for converting Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 15

Which of the following is an example of applied research?

Accepted Answer

Developing a new pesticide to reduce crop loss

Question 16

Which of the following is a correct risk-benefit analysis scenario?

Accepted Answer

Using ketorolac for a 24-year-old male after appendectomy has a higher benefit than risk.

Question 17

Which of the following is a homogeneous mixture?

Accepted Answer

Tea with sugar

Question 18

Which of the following is the correct SI unit for energy?

Accepted Answer

Joule (J)

Question 19

Which of the following is a property that can be observed without changing the chemical composition of a substance?

Accepted Answer

Boiling point

Question 20

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the inertia of an object; weight is the force on an object.

Introduction to Chemistry: Foundations, Matter, and Measurement

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