Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout and the components are evenly distributed.

Question 2

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

Accepted Answer

A chocolate chip cookie

Question 3

A sample of water is found to be 88.8% oxygen and 11.2% hydrogen by mass. What does this indicate about water?

Accepted Answer

Water is a pure substance with a fixed composition.

Question 4

Which of the following statements about mixtures is correct?

Accepted Answer

The components of a mixture retain their individual properties.

Question 5

Which of the following is NOT a pure substance?

Accepted Answer

Milk

Question 6

Which of the following is a correct example of a solution (homogeneous mixture) in the solid state?

Accepted Answer

Brass (an alloy of copper and zinc)

Question 7

A student is given a sample that can be separated into its components by physical means. Which of the following best describes the sample?

Accepted Answer

A mixture

Question 8

Which of the following is the correct SI base unit for temperature?

Accepted Answer

Kelvin ($$\mathrm{K})$$

Question 9

Which of the following best explains why air is considered a homogeneous mixture?

Accepted Answer

The gases in air are evenly mixed and the composition is uniform throughout.

Question 10

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

Accepted Answer

Dissolve the mixture in water, filter out the sand, then evaporate the water to recover the salt.

Question 11

Which of the following statements about pure substances is true?

Accepted Answer

A pure substance has a constant composition and distinct chemical properties.

Question 12

Which of the following is an example of a gas dissolved in a liquid?

Accepted Answer

Carbon dioxide in water (soda)

Question 13

A sample of gold jewelry is labeled as 14K gold, which is an alloy. What type of matter is this?

Accepted Answer

A homogeneous mixture (solution) of metals

Question 14

Which of the following is the correct SI base unit for the amount of substance?

Accepted Answer

Mole ($$\mathrm{mol})$$

Question 15

A student claims that milk is a homogeneous mixture. Which of the following best evaluates this claim?

Accepted Answer

Milk is actually a heterogeneous mixture because its composition is not uniform at the microscopic level.

Question 16

Which of the following is a correct statement about the separation of mixtures?

Accepted Answer

Mixtures can be separated by physical means such as filtration, distillation, or evaporation.

Question 17

Which of the following is a correct example of a liquid dissolved in a solid?

Accepted Answer

Mercury in silver and tin (dental amalgam)

Question 18

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

Accepted Answer

An element consists of only one type of atom, while a compound consists of two or more elements chemically combined in a fixed ratio.

Question 19

A sample of Kool-Aid is prepared by dissolving sugar and flavoring in water. Which of the following best describes this sample?

Accepted Answer

A homogeneous mixture (solution)

Question 20

Which of the following is the correct SI base unit for mass?

Accepted Answer

Kilogram ($$\mathrm{kg})$$

Classification of Matter and SI Units: Introduction to Chemistry Study Notes

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