Question 1

Which of the following best describes an alloy such as brass?

Accepted Answer

A homogeneous mixture of metals

Question 2

A student is given a sample of muddy water and asked to separate the solid particles from the liquid. Which separation technique would be most appropriate?

Accepted Answer

Filtration

Question 3

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

Accepted Answer

Density

Question 4

Which of the following changes is exothermic?

Accepted Answer

Water freezing to form ice

Question 5

A sample of a substance has a mass of 45.0 g and a volume of 15.0 mL. What is its density?

Accepted Answer

3.00 g/mL

Question 6

Which of the following statements about compounds is correct?

Accepted Answer

They have properties different from their constituent elements.

Question 7

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 8

A 10.0 g sample of a substance is divided into two 5.0 g samples. Which property will remain unchanged in both samples?

Accepted Answer

Density

Question 9

Which of the following best describes the difference between a homogeneous and a heterogeneous mixture?

Accepted Answer

A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture does not.

Question 10

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

Accepted Answer

Boiling water to produce steam

Question 11

How many atoms are present in 0.68 moles of zinc?

Accepted Answer

$$4.09 × 10^23$$ atoms

Question 12

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

Accepted Answer

The total energy before and after a reaction remains constant, though it may change forms.

Question 13

Which of the following is an example of an allotrope?

Accepted Answer

Diamond and graphite (both forms of carbon)

Question 14

A sample contains $$2.65 × 10^23$$ atoms of neon. What is the mass of this sample? (Atomic mass of Ne = 20.18 g/mol)

Accepted Answer

8.88 g

Question 15

Which of the following is a correct statement about elements and compounds?

Accepted Answer

Elements contain only one type of atom, while compounds contain two or more types of atoms chemically bonded.

Question 16

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

Accepted Answer

Oxygen (O2)

Question 17

A 50.0 g sample of a metal is placed in a graduated cylinder containing 20.0 mL of water. The water level rises to 32.0 mL. What is the density of the metal?

Accepted Answer

4.17 g/mL

Question 18

Which of the following best describes a suspension?

Accepted Answer

A heterogeneous mixture in which particles settle over time

Question 19

Which of the following is NOT a physical method for separating mixtures?

Accepted Answer

Electrolysis

Question 20

How many moles are in $$3.79 × 10^25$$ atoms of zinc?

Accepted Answer

62.97 mol

Introduction to Matter, Classification, and Basic Quantitative Concepts in Chemistry

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