Question 1

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

Accepted Answer

Burning wood in a campfire

Question 2

Which statement best describes an intensive property?

Accepted Answer

It does not change regardless of the sample size.

Question 3

A student mixes sand and salt together in a beaker. What type of matter is formed?

Accepted Answer

Heterogeneous mixture

Question 4

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acids

Question 5

Which process is an example of a reversible change?

Accepted Answer

Melting chocolate and then re-solidifying it in the freezer

Question 6

Which of the following is classified as an extensive property?

Accepted Answer

Mass

Question 7

A cup of black coffee is best described as:

Accepted Answer

A homogeneous mixture

Question 8

Which of the following represents a chemical property of hydrogen gas?

Accepted Answer

It reacts explosively with oxygen gas.

Question 9

Which of the following is the correct formula to convert Celsius to Kelvin?

Accepted Answer

$$K = 	ext{C} + 273$$

Question 10

Which of the following is written correctly in scientific notation?

Accepted Answer

$$1.25 	imes 10^4$

Question 11

A gold bar is best classified as:

Accepted Answer

An element

Question 12

Which of the following is NOT an example of an intensive property?

Accepted Answer

Milligrams

Question 13

Which of the following changes is irreversible?

Accepted Answer

Cooking an egg

Question 14

Which SI base unit is used to measure the amount of substance?

Accepted Answer

Mole

Question 15

Which of the following is a homogeneous mixture?

Accepted Answer

Seawater (unfiltered)

Question 16

Which of the following is NOT a chemical property for an unknown element?

Accepted Answer

It has a yellow-orange color.

Question 17

Which of the following is a physical change?

Accepted Answer

Dissolving sugar in water

Question 18

Which of the following is an extensive property?

Accepted Answer

Kilograms

Question 19

Which of the following containers would have the greatest flow of thermal energy in the form of heat?

Accepted Answer

40 g H$$_2O at 50$^	ext{o}C$$

Question 20

Which of the following is the correct formula to convert Celsius to Fahrenheit?

Accepted Answer

$$F = 1.8 	imes (C) + 32$$

Matter and Measurements: Foundations for GOB Chemistry

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