Question 1

Which of the following best defines a chemical as used in chemistry?

Accepted Answer

A substance with the same composition and properties wherever it is found.

Question 2

Hemoglobin is important in the blood because it:

Accepted Answer

Transports oxygen to tissues and carbon dioxide to the lungs.

Question 3

Which of the following is NOT a step in the scientific method as shown in the concept map?

Accepted Answer

Diagnosis

Question 4

Aspirin relieves a headache by:

Accepted Answer

Blocking the production of prostaglandins, which stimulate pain signals.

Question 5

Which of the following is an example of a chemical reaction in the body?

Accepted Answer

Hemoglobin binding to oxygen in the lungs.

Question 6

Which of the following is a key math skill used in chemistry according to the concept map?

Accepted Answer

Calculating percentages

Question 7

Which statement about the scientific method is correct?

Accepted Answer

It involves making observations that lead to a hypothesis.

Question 8

Which of the following best describes the role of chemistry in understanding diseases such as cancer or AIDS?

Accepted Answer

Chemistry helps in understanding the chemical processes involved in diseases.

Question 9

Which of the following is an example of practicing problem solving in chemistry?

Accepted Answer

Calculating the percentage of aspirin in a tablet.

Question 10

Which of the following is a correct application of scientific notation?

Accepted Answer

$$2.4 	imes 10^3$

Question 11

If a tablet contains 325 mg of aspirin and has a total mass of 345 mg, what is the percent of aspirin in the tablet? Use the formula $$	ext{Percent} = \frac{	ext{part}}{	ext{whole}} 	imes 100\%.$$

Accepted Answer

$$94.2\%$$

Question 12

Which of the following is NOT a property of a chemical?

Accepted Answer

It changes its properties depending on location.

Question 13

Which of the following is an example of using observations in the scientific method?

Accepted Answer

Noticing that a solution changes color when mixed with another chemical.

Question 14

Which of the following is a real-life application of chemistry mentioned in the study materials?

Accepted Answer

Understanding how aspirin relieves pain.

Question 15

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

Accepted Answer

Observation, Hypothesis, Experiment, Conclusion/Theory

Chemistry in Our Lives: Introduction and Key Concepts

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