Question 1

Which of the following best describes a scientific theory?

Accepted Answer

A well-tested explanation that tells why something happens in nature.

Question 2

Which of the following is an example of a physical change?

Accepted Answer

Water boiling at $$100\ ^\circ \mathrm{C}.$$

Question 3

A student mixes salt and water and then separates them by evaporation. This process is an example of:

Accepted Answer

A physical change.

Question 4

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 5

Which field of chemistry focuses on the principles of physics involved in chemical interactions?

Accepted Answer

Physical chemistry

Question 6

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 7

Which of the following statements about matter is correct?

Accepted Answer

Matter is anything that has mass and occupies space.

Question 8

A sample of brass is best classified as:

Accepted Answer

A homogeneous mixture

Question 9

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

Accepted Answer

A piece of iron rusts and the total mass of the rusted iron and oxygen used equals the mass of the original iron and oxygen.

Question 10

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 11

Which of the following is an example of a chemical change?

Accepted Answer

Iron reacting with oxygen to form rust.

Question 12

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements that are chemically combined.

Question 13

Which of the following is a quantitative observation?

Accepted Answer

The regular soda weighs 375 grams.

Question 14

Which of the following is a correct statement about plasma?

Accepted Answer

Plasma consists of charged particles and conducts electricity.

Question 15

A scientist observes that a dye fades when exposed to sunlight. This is an example of:

Accepted Answer

A chemical change

Question 16

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Oil and water

Question 17

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 18

Which of the following best describes the difference between a scientific law and a scientific theory?

Accepted Answer

A law describes what happens in nature, while a theory explains why or how it happens.

Question 19

Which of the following is an example of a synthetic chemical?

Accepted Answer

Aspirin

Question 20

Which of the following best describes the arrangement and movement of particles in a solid?

Accepted Answer

Particles are tightly packed in a regular, fixed pattern and vibrate in place.

Introduction to General Chemistry: Matter, Scientific Method, and Properties

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