Q: Which of the following is an example of a scientific law?

Law of Conservation of Mass: $$\text{In a chemical reaction, matter is neither created nor destroyed.}$$

Question 1

Which of the following best describes the main focus of chemistry as a science?

Accepted Answer

The study of the properties of substances and the particles that compose them.

Question 2

Which of the following is the smallest identifiable unit of an element?

Accepted Answer

Atom

Question 3

A chemist is asked to develop a new medication. Which branch of chemistry is most directly involved in this task?

Accepted Answer

Organic chemistry

Question 4

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

Accepted Answer

A theory can be revised if new evidence is found.

Question 5

Which of the following is an example of a scientific law?

Accepted Answer

Law of Conservation of Mass: $$	ext{In a chemical reaction, matter is neither created nor destroyed.}$$

Question 6

A student observes that a 240-mL serving of soda pop contains 27 g of sugar. This is an example of:

Accepted Answer

An observation

Question 7

Which of the following best distinguishes a law from a theory?

Accepted Answer

A law summarizes what will happen, while a theory explains why it happens.

Question 8

Which of the following is a falsifiable hypothesis?

Accepted Answer

All soda tastes sweet because of sugar.

Question 9

A chemist is asked to measure the amount of lead in drinking water. Which branch of chemistry is most relevant?

Accepted Answer

Analytical chemistry

Question 10

Which of the following is an example of applying the scientific method in a real-world scenario?

Accepted Answer

A student guesses that plants need sunlight to grow and tests this by placing one plant in the dark and one in the light.

Question 11

Which of the following best describes the role of experiments in the scientific method?

Accepted Answer

Experiments are used to validate or invalidate hypotheses, laws, or theories.

Question 12

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

Accepted Answer

Proof

Question 13

A chemist develops a new theory about the behavior of electrons in a molecule. What must happen for this theory to be accepted by the scientific community?

Accepted Answer

It must be tested and validated by multiple experiments.

Question 14

Which of the following is an example of a quantitative observation?

Accepted Answer

A 240-mL serving of soda pop contains 27 g of sugar.

Question 15

Which of the following best describes the difference between organic and inorganic chemistry?

Accepted Answer

Organic chemistry studies carbon-based compounds, while inorganic chemistry studies substances not containing carbon.

Question 16

Which of the following is an example of how chemistry is central to other sciences?

Accepted Answer

Chemistry helps explain the molecular basis of diseases in medicine.

Question 17

A student proposes that all plants need exactly one cup of water per day to survive. After watering several plants with this amount, some die. What should the student do next according to the scientific method?

Accepted Answer

Revise the hypothesis to account for the new data and run another experiment.

Question 18

Which of the following is a key skill for success in chemistry, according to the study materials?

Accepted Answer

Memorizing important information such as names, formulas, and charges of polyatomic ions.

Question 19

Which of the following best describes the Law of Conservation of Mass?

Accepted Answer

$$	ext{In a chemical reaction, matter is neither created nor destroyed.}$$

Question 20

Which of the following is an example of a theory in chemistry?

Accepted Answer

Dalton’s Atomic Theory

Introduction to Chemistry: The Chemical World and Scientific Method

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