Question 1

A sample of gold has a mass of 19.3 g and occupies a volume of 1.00 cm³. Which property of gold does this measurement best illustrate?
Correct answer: Its density

Accepted Answer

Its density

Question 2

Which of the following is an example of a heterogeneous mixture?
Correct answer: Salad with lettuce, tomatoes, and cucumbers

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 3

A student separates a mixture of sand and iron filings by using a magnet. Which property allows this separation?
Correct answer: Magnetism

Accepted Answer

Magnetism

Question 4

Which of the following statements best describes an allotrope?
Correct answer: Different forms of the same element in the same physical state

Accepted Answer

Different forms of the same element in the same physical state

Question 5

Which of the following is an intensive property of matter?
Correct answer: Density

Accepted Answer

Density

Question 6

A 50.0 g sample of a substance occupies 20.0 mL. What is its density?
Correct answer: 2.5 g/mL

Accepted Answer

2.5 g/mL

Question 7

Which process is an example of an endothermic change?
Correct answer: Melting of ice

Accepted Answer

Melting of ice

Question 8

A chemist has 0.50 moles of sodium chloride (NaCl). How many formula units of NaCl does this represent?
Correct answer: $$3.01 × 10^23$$

Accepted Answer

$$3.01 × 10^23$$

Question 9

Which of the following best explains why the properties of a compound differ from those of its constituent elements?
Correct answer: Compounds have atoms chemically bonded in fixed ratios

Accepted Answer

Compounds have atoms chemically bonded in fixed ratios

Question 10

A 10.0 g sample of a compound contains 4.0 g of element X and 6.0 g of element Y. What is the percent composition of element X in the compound?
Correct answer: 40%

Accepted Answer

40%

Question 11

Which of the following is a chemical property?
Correct answer: Reactivity with oxygen

Accepted Answer

Reactivity with oxygen

Question 12

Which method would best separate a solution of salt dissolved in water?
Correct answer: Distillation

Accepted Answer

Distillation

Question 13

Which of the following statements is consistent with the Law of Conservation of Energy?
Correct answer: Energy is transformed but not created or destroyed

Accepted Answer

Energy is transformed but not created or destroyed

Question 14

Which of the following is a homogeneous mixture?
Correct answer: Brass

Accepted Answer

Brass

Question 15

A sample of oxygen gas (O2) and ozone (O3) are both in the gaseous state. What is the relationship between these two substances?
Correct answer: They are allotropes

Accepted Answer

They are allotropes

Question 16

Which of the following best describes a compound?
Correct answer: A substance made of two or more elements chemically bonded

Accepted Answer

A substance made of two or more elements chemically bonded

Question 17

A 25.0 g sample of a metal is placed in a graduated cylinder containing 10.0 mL of water. The water level rises to 15.0 mL. What is the density of the metal?
Correct answer: 5.0 g/mL

Accepted Answer

5.0 g/mL

Question 18

Which of the following is a physical change?
Correct answer: Melting of ice

Accepted Answer

Melting of ice

Question 19

How many moles are present in 36.0 g of water (H2O)? (Molar mass of H2O = 18.0 g/mol)
Correct answer: 2.0 moles

Accepted Answer

2.0 moles

Question 20

Which of the following best distinguishes a pure substance from a mixture?
Correct answer: A pure substance has uniform and definite composition

Accepted Answer

A pure substance has uniform and definite composition

Fundamental Concepts of Matter and Measurement in Chemistry

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