Question 1

Which of the following best describes a plasma, the fourth state of matter?

Accepted Answer

A state of matter consisting of electrically charged particles, found in high temperature environments such as stars and lightning.

Question 2

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

Accepted Answer

Burning wood to form ash and gases.

Question 3

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

Accepted Answer

An element

Question 4

Which property is intensive?

Accepted Answer

Density

Question 5

Which of the following best explains the law of conservation of matter?

Accepted Answer

The total quantity of matter remains constant during physical and chemical changes.

Question 6

A mixture of sand and salt is best described as:

Accepted Answer

A heterogeneous mixture

Question 7

Which of the following is a physical property?

Accepted Answer

Melting point

Question 8

Which of the following statements about molecules is correct?

Accepted Answer

Molecules can consist of two or more atoms of the same element bonded together.

Question 9

A student measures the mass of a sample as 12.345 g, 12.346 g, and 12.344 g in three trials. The true mass is 12.500 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 10

Which of the following is the correct formula for density?

Accepted Answer

$$density = \frac{mass}{volume}$$

Question 11

A sample of liquid has a mass of 25.0 g and a volume of 20.0 mL. What is its density?

Accepted Answer

$$1.25\ g/mL$$

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 NOT a base SI unit?

Accepted Answer

Liter (L)

Question 14

Convert 25.0 °C to Kelvin.

Accepted Answer

$$298.2\ K$$

Question 15

Which of the following best describes a compound?

Accepted Answer

A pure substance that can be broken down into simpler substances by chemical changes.

Question 16

Which of the following is the correct relationship for converting Celsius to Fahrenheit?

Accepted Answer

$$T_F = \frac{9}{5} T_C + 32$$

Question 17

A student adds 12.11 g and 0.034 g. How should the answer be reported with the correct number of significant figures?

Accepted Answer

12.14 g

Question 18

Which of the following is a chemical property?

Accepted Answer

Reactivity with oxygen

Question 19

A cube has a side length of 2.00 cm. What is its volume in cubic centimeters?

Accepted Answer

$$8.00\ cm^3$

Question 20

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the same on Earth and the Moon, while weight varies depending on gravity.

Introduction to Chemistry: Matter, Measurement, and Classification

Study Guide - Practice Questions

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