Question 1

Which of the following best defines chemistry?

Accepted Answer

The study of the composition, structure, properties, and reactions of matter.

Question 2

Which of the following is NOT considered matter?

Accepted Answer

Sunlight

Question 3

A forensic scientist analyzes a blood sample to determine the presence of a drug. Which aspect of chemistry is primarily involved in this process?

Accepted Answer

Composition

Question 4

Which of the following is a chemical as defined in chemistry?

Accepted Answer

A substance with the same composition and properties wherever found

Question 5

Which of the following is a correct example of a chemical reaction?

Accepted Answer

An antacid tablet fizzing in water

Question 6

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

Accepted Answer

Ignoring experimental results

Question 7

A student observes that a plant grows faster when given a certain fertilizer. She hypothesizes that the fertilizer increases growth rate. What should she do next according to the scientific method?

Accepted Answer

Conduct experiments to test the hypothesis

Question 8

Which of the following is the correct scientific notation for 0.000 003 grams?

Accepted Answer

$$3 	imes 10$$^{-6}$$ grams

Question 9

A tablet contains 325 mg of aspirin and has a total mass of 545 mg. What is the percentage of aspirin in the tablet? (Round to the nearest whole number)

Accepted Answer

60%

Question 10

Which of the following digits in the number 15.24 has a place value of hundredths?

Accepted Answer

4

Question 11

Which of the following is the correct rearrangement of the equation $$P_1$$ $$V_1$$ = $$P_2$$ $$V_2 to $$solve for $$P_1$$?

Accepted Answer

$$P_1$$ = \frac{$$P_2$$ $$V_2$$}{$$V_1$$}$$

Question 12

Which of the following is a good study habit for success in chemistry?

Accepted Answer

Self-testing with practice problems

Question 13

Which chemical in toothpaste is responsible for preventing cavities by strengthening tooth enamel?

Accepted Answer

Sodium fluorophosphate

Question 14

A graph shows the volume of a gas increasing as temperature increases. What type of relationship is this?

Accepted Answer

Direct relationship

Question 15

Which of the following numbers is correctly written in scientific notation?

Accepted Answer

$$6.8 	imes 10$$^{1}$$

Question 16

Which of the following is a real-life application of chemistry in medicine?

Accepted Answer

Hemoglobin transporting oxygen in the blood

Question 17

Which of the following is the correct scientific notation for the number 550,000,000,000?

Accepted Answer

$$5.5 	imes 10$$^{11}$$

Question 18

Which of the following is NOT a chemical commonly found in toothpaste?

Accepted Answer

Sodium chloride

Question 19

If a hypothesis is not supported by experimental results, what should a scientist do according to the scientific method?

Accepted Answer

Modify the hypothesis and test again

Question 20

Which of the following best describes a theory in science?

Accepted Answer

A well-tested explanation based on a broad set of observations and experiments

Chapter 1: Chemistry in Our Lives – Foundations and Skills

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