$$rac{378}{550} imes 212 = 145.6 g$$

Question 1

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

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 2

A 119.5 g solid cylinder has a radius of 1.8 cm and a height of 1.5 cm. What is its density? (Use $$V = 	ext{π}r^2$h)$$

Accepted Answer

$$	ext{Density} = rac{119.5}{	ext{π} 	imes (1.8)^2$ 	imes 1.5} = 7.85 	ext{ g/cm}^3$$

Question 3

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

Accepted Answer

Density

Question 4

Which process would best separate a mixture of sand and iron filings?

Accepted Answer

Using a magnet

Question 5

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

Accepted Answer

348 g

Question 6

Which of the following statements about compounds is correct?

Accepted Answer

Compounds contain two or more different types of atoms chemically bonded.

Question 7

Which of the following is a chemical property?

Accepted Answer

Reactivity with water

Question 8

A 153 g rectangular solid has edge lengths 8.2 cm, 5.1 cm, and 4.7 cm. What is its density?

Accepted Answer

$$	ext{Density} = rac{153}{8.2 	imes 5.1 	imes 4.7} = 0.78 	ext{ g/cm}^3$$

Question 9

Which of the following best describes an alloy?

Accepted Answer

A homogeneous mixture of metals

Question 10

How many atoms are in 0.68 moles of zinc?

Accepted Answer

$$0.68 	imes 6.02 	imes 10$$^{23}$$ = 4.09 	imes 10$$^{23}$$ atoms

Question 11

Which of the following is a correct statement about the Law of Conservation of Energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed.

Question 12

Which of the following changes is exothermic?

Accepted Answer

Water freezing

Question 13

A 550 g sample of chromium(III) oxide (Cr$$_2O$_3) $$has 378 g Cr. How many grams of Cr are in a 212 g sample of Cr$$_2O$_3$$?

Accepted Answer

$$rac{378}{550} 	imes 212 = 145.6 g$$

Question 14

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

Accepted Answer

Oxygen (O$$_2)$$

Question 15

Which method would best separate a solution of salt dissolved in water?

Accepted Answer

Distillation

Question 16

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 17

Which of the following best describes a monatomic element?

Accepted Answer

An element that consists of unbonded, single atoms

Question 18

Which of the following is a correct statement about mixtures?

Accepted Answer

Mixtures can be separated by physical means.

Question 19

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

Accepted Answer

$$rac{22.7}{2.0} = 11.35 g/cm$^3$$

Question 20

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

Accepted Answer

Melting of ice

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

Study Guide - Practice Questions