$$4.10 \\times 10$$^{23}$$ atoms

Question 1

Which of the following best describes an element?

Accepted Answer

A substance that contains only one type of atom and cannot be separated by chemical means.

Question 2

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

Accepted Answer

Electrical conductivity

Question 3

A sample of lead (Pb) has a mass of 22.7 g and a volume of 2.0 cm$$^3. $$What is the density of the sample?

Accepted Answer

$$11.35\ \text{g/cm}^3$$

Question 4

Which of the following changes is an example of an endothermic process?

Accepted Answer

CO$$_2$$ subliming

Question 5

A mixture of sand and iron filings can be separated most effectively by which method?

Accepted Answer

Magnet

Question 6

Which statement about compounds is correct?

Accepted Answer

Compounds have properties different from their constituent elements.

Question 7

How many atoms are in 0.68 moles of zinc?

Accepted Answer

$$4.10 \times 10$$^{23}$$ atoms

Question 8

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

Accepted Answer

Bronze

Question 9

A 119.5 g solid cylinder has a radius of 1.8 cm and height of 1.5 cm. What is its density?

Accepted Answer

$$7.05\ \text{g/cm}^3$$

Question 10

Which property is intensive?

Accepted Answer

Density

Question 11

Which of the following is a diatomic element?

Accepted Answer

O$$_2$$

Question 12

A sample of butane (C$$_4H$_{10}) $$contains 288 g carbon and 60 g hydrogen. What is the percent by mass of hydrogen in butane?

Accepted Answer

$$17.3\%$$

Question 13

Which of the following is NOT a chemical property?

Accepted Answer

Electrical conductivity

Question 14

Which process is best for separating a solution of salt water into its components?

Accepted Answer

Distillation

Question 15

How many grams of chromium are in a 212 g sample of Cr$$_2O$_3 if a 550 g $$sample contains 376 g Cr?

Accepted Answer

$$145\ \text{g}$$

Question 16

Which of the following is an example of an allotrope?

Accepted Answer

O$$_2$$ and O$$_3$$

Question 17

Which statement about mixtures is correct?

Accepted Answer

Mixtures can be separated by physical means.

Question 18

Which of the following best describes the Law of Conservation of Energy in a chemical reaction?

Accepted Answer

Energy is neither created nor destroyed, only transformed.

Question 19

How many moles are in $$3.79 \times 10$$^{24}$$ atoms of zinc?

Accepted Answer

$$6.30$$ moles

Question 20

Which of the following is a chemical change?

Accepted Answer

Paper burning

Fundamental Concepts in General Chemistry: Matter, Mixtures, Properties, and the Mole

Study Guide - Practice Questions