Question 1

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

Accepted Answer

Sand in water

Question 2

A sample of gold has a mass of 38.6 g and a volume of 2.00 cm³. What is the density of gold in g/cm³?

Accepted Answer

19.3

Question 3

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

Accepted Answer

Density

Question 4

Which process is used to separate a mixture of sand and iron filings?

Accepted Answer

Magnet

Question 5

Which of the following statements best describes an allotrope?

Accepted Answer

A different form of the same element in the same state

Question 6

Which of the following changes is exothermic?

Accepted Answer

Condensation of steam

Question 7

A student has 0.50 moles of sodium chloride (NaCl). How many formula units of NaCl does this represent?

Accepted Answer

$$3.01 × 10^23$$

Question 8

Which of the following is a chemical property?

Accepted Answer

Reactivity with water

Question 9

Which statement correctly distinguishes between a compound and a mixture?

Accepted Answer

A compound has properties different from its elements, a mixture retains the properties of its components.

Question 10

A sample of an unknown metal has a mass of 45.0 g and displaces 5.0 mL of water in a graduated cylinder. What is the density of the metal in g/mL?

Accepted Answer

9.0

Question 11

Which of the following best describes the Law of Conservation of Energy?

Accepted Answer

Energy can be transformed from one form to another but cannot be created or destroyed.

Question 12

Which of the following is a diatomic element in its natural state?

Accepted Answer

Oxygen (O2)

Question 13

A 10.0 g sample of a substance occupies 2.50 cm³. What is its density?

Accepted Answer

4.00 g/cm³

Question 14

Which separation technique would be most effective for separating a solution of salt dissolved in water?

Accepted Answer

Distillation

Question 15

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 16

How many atoms are present in 0.25 moles of carbon?

Accepted Answer

$$1.51 × 10^23$$

Question 17

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 18

Which of the following best describes a compound?

Accepted Answer

A pure substance composed of two or more different atoms chemically bonded

Question 19

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

Accepted Answer

Melting of ice

Question 20

A sample contains $$3.01 × 10^24$$ atoms of copper. How many moles of copper are present?

Accepted Answer

5.00

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

Study Guide - Practice Questions