Question 1

At STP, $	ext{O}_2(	ext{g})$ and $	ext{O}_3(	ext{g})$ are two forms of the
same element that have

Accepted Answer

different molecular structures and different
properties

Answer

different molecular structures and the same
properties

Answer

the same molecular structure and different
properties

Answer

the same molecular structure and the same
properties

Question 2

Which two terms represent major categories of
compounds?

Accepted Answer

ionic and molecular

Answer

empirical and molecular

Answer

ionic and nuclear

Answer

empirical and nuclear

Question 3

Which formula represents an asymmetrical
molecule?

Accepted Answer

$	ext{NH}_3$

Answer

$	ext{CH}_4$

Answer

$	ext{CO}_2$

Answer

$	ext{N}_2$

Question 4

Which statement describes the energy changes
that occur as bonds are broken and formed
during a chemical reaction?

Accepted Answer

Energy is absorbed when bonds are broken,
and energy is released when bonds are
formed.

Answer

Energy is released when bonds are both
broken and formed

Answer

Energy is absorbed when bonds are both
broken and formed.

Answer

Energy is released when bonds are broken,
and energy is absorbed when bonds are
formed.

Question 5

A solid sample of copper is an excellent
conductor of electric current. Which type of
chemical bonds are in the sample?

Accepted Answer

metallic bonds

Answer

polar covalent bonds

Answer

nonpolar covalent bonds

Answer

ionic bonds

Question 6

Based on Table S, an atom of which element has
the strongest attraction for electrons in a
chemical bond?

Accepted Answer

oxygen

Answer

chlorine

Answer

nitrogen

Answer

selenium

Question 7

Compared to  $	ext{H}_2	ext{S},$ the higher boiling point of
 $	ext{H}_2	ext{O}$ is due to the

Accepted Answer

stronger hydrogen bonding in water

Answer

larger gram-formula mass of water

Answer

greater molecular size of water

Answer

higher molarity of water

Question 8

A molecule of which compound has a multiple
covalent bond?

Accepted Answer

$	ext{C}_2	ext{H}_4$

Answer

$	ext{C}_3	ext{H}_8$

Answer

$	ext{CH}_4$

Answer

$	ext{C}_4	ext{H}_{10}

Question 9

The energy released by a nuclear fusion
reaction is produced when

Accepted Answer

mass is converted to energy

Answer

energy is converted to mass

Answer

heat is converted to temperature

Answer

temperature is converted to heat

Question 10

When a $	ext{Mg}^{2 +}	ext{ion}$ becomes a $	ext{Mg atom},$ the
radius increases because the $	ext{Mg}^{2 +}	ext{ion}$

Accepted Answer

gains 2 electrons

Answer

loses 2 electrons

Answer

gains 2 protons

Answer

loses 2 protons

Question 11

The least polar bond is found in a molecule of

Accepted Answer

$	ext{HI}$

Answer

$	ext{HCl}$

Answer

$	ext{HF}$

Answer

$	ext{HCr}$

Question 12

Which equation represents energy being
absorbed as a bond is broken?

Accepted Answer

$	ext{H}_2+	ext{energy}ightarrow	ext{H}+	ext{H}$

Answer

$	ext{H}+	ext{H}ightarrow	ext{H}_2+	ext{energy}$

Answer

$	ext{H}+	ext{H}+	ext{energy}ightarrow	ext{H}_2$

Answer

$	ext{H}_2ightarrow	ext{H}+	ext{H}+	ext{energy}$

Question 13

Which term is used to describe the attraction
that an oxygen atom has for the electrons in a
chemical bond?

Accepted Answer

electronegativity

Answer

first ionization energy

Answer

electron configuration

Answer

alkalinity

Question 14

Compared to the energy released per mole of
reactant during chemical reactions, the energy
released per mole of reactant during nuclear
reactions is

Accepted Answer

much greater

Answer

slightly less

Answer

much less

Answer

slightly greater

Question 15

Given the information in the table below:

Diamond and graphite have different properties because they have different

Accepted Answer

crystal structures

Answer

electronegativities

Answer

numbers of protons per atom

Answer

numbers of valence electrons per atom

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