Question 1

Which pair of elements is most likely to form a covalently bonded compound?

Accepted Answer

P and O

Answer

Zn and Br

Answer

Ca and S

Answer

Li and Cl

Question 2

If you dissolve a substance in water and the container turns very cold, what kind of reaction occurred?

Accepted Answer

endothermic

Answer

neither of these

Answer

both of these

Answer

exothermic

Question 3

What causes atoms to form chemical bonds with other atoms?

Accepted Answer

The interaction of valence electrons forms a full outer shell

Answer

When two atoms get close together, they merge into one.

Answer

The attraction of the nuclei for one another causes atoms to share electrons.

Answer

Atoms are more stable when they give away electrons

Question 4

How many atoms of oxygen are in one formula unit of aluminum sulfate, $Al_2(SO_4)_3$ ?

Accepted Answer

12

Answer

8

Answer

4

Answer

3

Question 5

A nitride anion, N$^3-$, has a charge of 3-. What is the charge of a titanium cation in the compound Ti$_3$N$_2$?

Accepted Answer

2+

Answer

3-

Answer

3+

Answer

2-

Question 6

A chemical bond can be defined as a force that

Accepted Answer

holds parts of a compound together

Answer

blends nuclei together

Answer

keeps electrons orbiting the nucleus

Answer

causes electric repulsion

Question 7

The chemical formula for calcium chloride is

Accepted Answer

CaCl$_2$

Answer

Ca$_2$Cl

Answer

CaCl

Answer

Ca$_2$Cl$_2$

Question 8

Which compound is an example of an ionic compound?

Accepted Answer

KCl

Answer

CO$_2$

Answer

H$_2$O

Answer

PCl$_3$

Question 9

A double bond is represented in a structural formula with

Accepted Answer

2 lines between elements

Answer

dots between elements

Answer

3 lines between elements

Answer

1 line between elements

Question 10

An ionic bond is a bond that forms between

Accepted Answer

ions with opposite charges.

Answer

the electrons of two different atoms.

Answer

atoms with neutral charges.

Answer

one atom’s nucleus and another atom’s electrons.

Question 11

Covalent bonds are formed between

Accepted Answer

nonmetal atoms.

Answer

compounds

Answer

metal atoms

Answer

ions

Question 12

The name dinitrogen tetroxide tells you that this compound contains

Accepted Answer

two nitrogen atoms and four oxygen atoms.

Answer

four nitrogen atoms and two oxygen atoms.

Answer

four nitrogen atoms and four oxygen atoms.

Answer

two nitrogen atoms and two oxygen atoms.

Question 13

The compound PCl$_3$ is named

Accepted Answer

Phosphorus trichloride

Answer

Monophosphorus tetrachloride

Answer

Phosphorus chloride

Answer

Phosphorus  dichloride

Question 14

What is the oxidation number of sulfur?

Accepted Answer

-2

Answer

-1

Answer

+2

Answer

+1

Question 15

In a metallic bond, the electrons

Accepted Answer

flow between atoms

Answer

are shared between atoms.

Answer

do not change

Answer

are lost or gained

Question 16

A change in the color of a solution is a sign that

Accepted Answer

a chemical change is taking place.

Answer

a physical change has just occurred.

Answer

oxygen is present.

Answer

organic chemicals are present

Question 17

What happens in a chemical reaction?

Accepted Answer

Atoms are rearranged.

Answer

Atoms are destroyed.

Answer

Atoms are created.

Answer

Molecules are created.

Question 18

A synthesis reaction is a reaction between at least two compounds in which

Accepted Answer

a new, more complex compound is formed.

Answer

one breaks down into at least two products.

Answer

a compound burns in the presence of oxygen.

Answer

a compound is decomposed by an electric current.

Question 19

What is necessary for a combustion reaction to occur?

Accepted Answer

oxygen

Answer

wood

Answer

water

Answer

carbon dioxide

Question 20

A chemical equation is balanced by changing or adding

Accepted Answer

coefficients.

Answer

subscripts.

Answer

reactants.

Answer

chemical symbols.

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