Question 1

Which of the following best describes an intensive property of matter?

Accepted Answer

It does not depend on the amount of substance present.

Question 2

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

Accepted Answer

Burning of wood

Question 3

A student measures the mass of a sample as $$12.30\ \mathrm{g}$$ and its volume as $$4.0\ \mathrm{cm}^3. $$What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$3.1\ \mathrm{g/cm}^3$$

Question 4

Which of the following statements about mixtures is correct?

Accepted Answer

Homogeneous mixtures have a uniform composition throughout.

Question 5

Which of the following is a compound?

Accepted Answer

Water ($$\mathrm{H}_2\mathrm{O})$$

Question 6

Which of the following is an extensive property?

Accepted Answer

Mass

Question 7

A sample of a substance is heated and changes from a solid to a liquid. Which type of change has occurred?

Accepted Answer

Physical change

Question 8

Which of the following best describes a molecule?

Accepted Answer

A structure that consists of two or more atoms bonded together

Question 9

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 10

A student combines iron filings and sulfur powder, then heats the mixture to produce iron sulfide. Which statement is true about the process?

Accepted Answer

Heating the mixture to form iron sulfide is a chemical change.

Question 11

Which of the following best describes an element?

Accepted Answer

A pure substance that cannot be broken down into simpler substances by chemical means

Question 12

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

Accepted Answer

Salt dissolved in water

Question 13

Which of the following is a correct statement about physical and chemical changes?

Accepted Answer

Chemical changes result in the formation of new substances.

Question 14

A sample of ethanol has a mass of $$46.0\ \mathrm{g}$$ and a volume of $$58.0\ \mathrm{mL}. $$What is the density of ethanol?

Accepted Answer

$$0.79\ \mathrm{g/mL}$$

Question 15

Which of the following is NOT a phase of matter described in the notes?

Accepted Answer

Plasma

Question 16

Which of the following best describes a chemical property?

Accepted Answer

Reactivity with acid

Question 17

A student records the following measurements: $$2.50\ \mathrm{cm}$$, $$2.5\ \mathrm{cm}$$, and $$2.500\ \mathrm{cm}. $$How many significant figures are in each measurement, respectively?

Accepted Answer

3, 2, 4

Question 18

Which of the following is a correct statement about compounds?

Accepted Answer

Compounds have properties different from the elements that compose them.

Question 19

Which of the following is an example of an extensive property changing during a chemical reaction?

Accepted Answer

The mass of the reactants decreases as gas escapes.

Question 20

Which of the following best explains why density is considered an intensive property?

Accepted Answer

It does not change regardless of the amount of substance present.

Chapter 1: Describing Matter – General Chemistry Study Notes

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