Question 1

A student is given a sample of seawater and asked to classify it. Which of the following best describes seawater?

Accepted Answer

A homogeneous mixture, because its composition is uniform throughout

Question 2

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 3

A chemist wants to separate a mixture of sand and salt. Which method would be most appropriate?

Accepted Answer

Filtration

Question 4

Which of the following statements best distinguishes a compound from a mixture?

Accepted Answer

A compound consists of two or more elements chemically bonded together

Question 5

Which of the following is a chemical change?

Accepted Answer

Burning wood

Question 6

A sample of gold (Au) is classified as which of the following?

Accepted Answer

An element

Question 7

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

Question 8

Air is best classified as which of the following?

Accepted Answer

A homogeneous mixture, because its composition is uniform

Question 9

Which of the following processes is a physical change?

Accepted Answer

Melting of ice

Question 10

A 50.0 g sample of a substance occupies 20.0 mL. What is its density?

Accepted Answer

2.5 g/mL

Question 11

Which of the following is NOT a correct statement about mixtures?

Accepted Answer

Mixtures are always homogeneous

Question 12

Which of the following best describes the difference between an element and a compound?

Accepted Answer

Elements consist of only one type of atom, while compounds consist of two or more elements chemically bonded

Question 13

A student observes that when sugar is dissolved in water, the resulting solution is clear and uniform throughout. This solution is best classified as:

Accepted Answer

A homogeneous mixture

Question 14

Which of the following would require a chemical method to separate into its components?

Accepted Answer

Sodium chloride (NaCl)

Question 15

Which scenario best illustrates a heterogeneous mixture?

Accepted Answer

A glass of orange juice with pulp

Question 16

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

Accepted Answer

Boiling point

Question 17

A sample of iron rusts when left outside. This is an example of:

Accepted Answer

A chemical change, because new substances are formed

Question 18

Which of the following best describes why compounds have fixed composition?

Accepted Answer

Their elements are chemically bonded in definite proportions

Question 19

A 100 mL sample of ethanol has a mass of 78.9 g. If you take a 10 mL sample from it, what will be the density of the 10 mL sample?

Accepted Answer

0.789 g/mL

Question 20

Which of the following best explains why boiling water is considered a physical change?

Accepted Answer

It changes the state of water without altering its chemical identity

Classification of Matter: An Introduction to General Chemistry

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