Question 1

Which of the following best defines chemistry?

Accepted Answer

The science of the composition, structure, properties, and reactions of matter, especially of atomic and molecular systems.

Question 2

Which statement about matter is correct?

Accepted Answer

Matter is anything that has mass and takes up space.

Question 3

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring previous observations

Question 4

A student wants to test if salt affects the boiling point of water. Which step of the scientific method is she performing when she proposes that adding salt will increase the boiling point?

Accepted Answer

Formulating a hypothesis

Question 5

Which of the following best describes a scientific law?

Accepted Answer

A simple statement of natural phenomena to which no exceptions are known.

Question 6

The Law of Conservation of Mass states:

Accepted Answer

The total mass of substances before and after a chemical reaction is always the same.

Question 7

Which of the following is an example of applying the scientific method in everyday life?

Accepted Answer

Changing your route to school after hearing about an accident on the radio and evaluating which route gets you there fastest.

Question 8

Which of the following is a correct sequence of steps in the scientific method?

Accepted Answer

Make observations → Formulate a hypothesis → Perform experiments → Analyze results

Question 9

Which of the following is a characteristic of a scientific theory?

Accepted Answer

It is a well-established hypothesis that explains a broad range of phenomena.

Question 10

A chemist observes that a metal reacts with acid to produce hydrogen gas. She proposes that all metals react with acids to produce hydrogen gas. What is her proposal called?

Accepted Answer

A hypothesis

Question 11

Which equation represents the Law of Conservation of Mass for a chemical reaction?

Accepted Answer

$$\sum \mathrm{mass}_{\mathrm{reactants}} = \sum \mathrm{mass}_{\mathrm{products}}$$

Question 12

Which of the following fields does NOT heavily rely on chemistry?

Accepted Answer

Astrology

Question 13

A student divides her time between studying for two exams and writing a lab report. Which approach is she using?

Accepted Answer

Scientific method

Question 14

Which of the following is an example of matter?

Accepted Answer

Air

Question 15

Which of the following best describes a hypothesis?

Accepted Answer

A tentative explanation of certain facts that provides a basis for further investigation.

Question 16

Which of the following is NOT a property of matter?

Accepted Answer

Being weightless and not occupying space

Question 17

Which of the following is a real-world example of chemistry in action?

Accepted Answer

A doctor prescribing medication based on its chemical composition.

Question 18

Which of the following statements is true regarding scientific theories?

Accepted Answer

They explain a wide range of phenomena and are supported by evidence.

Question 19

Which of the following is the best example of using a logical approach to problem solving?

Accepted Answer

Choosing a route to school based on past traffic reports and current radio updates.

Question 20

Which of the following is NOT a step in the scientific method?

Accepted Answer

Accepting results without analysis

Introduction to Chemistry: Fundamental Concepts and Scientific Method

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