Question 1

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

Accepted Answer

The science that seeks to understand how matter behaves by studying what atoms and molecules do.

Question 2

Which statement best explains why water is a liquid at room temperature?

Accepted Answer

Because water molecules have a bent shape, which affects their physical properties.

Question 3

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

Accepted Answer

Matter is conserved in chemical reactions.

Question 4

Antoine Lavoisier’s experiments with combustion led to which important scientific law?

Accepted Answer

The Law of Conservation of Mass

Question 5

A student observes that the mass of a closed container does not change after burning a piece of wood inside it. According to the scientific method, this observation supports which concept?

Accepted Answer

The Law of Conservation of Mass

Question 6

Which of the following is a hypothesis?

Accepted Answer

If a plant is given fertilizer, it will grow faster.

Question 7

Which of the following best describes a scientific theory?

Accepted Answer

A model that gives a deeper explanation for observations and laws.

Question 8

A chemist measures the temperature of two water samples. One is $$40^\circ$$ Celsius and the other is $$44^\circ$$ Celsius. What does this illustrate about scientific observation?

Accepted Answer

Quantification is an important part of scientific observation.

Question 9

Which of the following is NOT a characteristic of a good hypothesis?

Accepted Answer

It is always proven correct.

Question 10

Which of the following statements is an example of a theory?

Accepted Answer

Matter is made of atoms.

Question 11

A scientist collects data on atmospheric carbon dioxide levels from 1970 to 2020. If the concentration in 1970 was 325 ppm and in 2020 it was 415 ppm, what is the increase in concentration?

Accepted Answer

$$415 - 325 = 90$$ ppm

Question 12

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

Accepted Answer

The mass of a closed container and its contents remains the same before and after a chemical reaction.

Question 13

Which of the following is a real-world example of chemicals composing ordinary things?

Accepted Answer

All of the above

Question 14

Which of the following best describes the relationship between atoms and molecules?

Accepted Answer

Molecules are made of atoms.

Question 15

Why is it important for a hypothesis to be falsifiable?

Accepted Answer

So it can be tested and potentially shown to be incorrect.

Question 16

Which of the following is an example of quantification in chemistry?

Accepted Answer

Measuring the mass of a sample as $$12.5$$ grams.

Question 17

Which of the following best describes the process of the scientific method?

Accepted Answer

Observation, hypothesis, experiment, revision, theory/law

Question 18

Which of the following is a correct statement about the atomic theory?

Accepted Answer

It is a theory supported by over 200 years of experimental evidence.

Question 19

A chemist wants to test if a new drug reduces fever. Which step of the scientific method is she performing when she gives the drug to patients and records their temperatures?

Accepted Answer

Conducting an experiment

Question 20

Which of the following is the best example of a measurement that could be used as scientific data?

Accepted Answer

The mass of the sample is $$5.0$$ grams.

Chapter 1: The Chemical World – Introductory Chemistry Study Notes

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