Module 2

Question 1

Atoms consist of

Answer 1

a single nucleus
with positive charge

surrounded by
a cloud of negatively charged
electrons.

Question 2

When atoms approach one another closely,

Answer 2

electron clouds interact with each other and with
the nuclei.

Question 3

If this interaction is such that the total energy of
the system is

Answer 3

Lowered

Question 4

atoms bond
together to form a

Answer 4

molecule.

Question 5

consist of an aggregation of atoms held together by valence forces .

Answer 5

Molecules

Question 6

A molecule consist of ____________ held together by valence forces

Answer 6

Aggregation of atoms

Question 7

group of two or more atoms that form the smallest identifiable unit

Answer 7

Molecules

Question 8

Molecules are a group of two or more atoms that form the smallest identifiable unit into which
a pure substance can be divided and

Answer 8

still retain the composition and chemical
properties of that substance.

Question 9

Contain two atoms that are chemically bonded.

Answer 9

Diatomic molecules

Question 10

Contain two identical atoms that are chemically bonded.

Answer 10

Homonuclear

Question 11

Contain two different atoms that are chemically bonded.

Answer 11

Heteronuclear

Question 12

Molecules containing more than two atoms.

Answer 12

Polyatomic molecules:

Question 13

The fundamental principle of chemistry is that

Answer 13

the atoms of
different elements can combine with one another to form
chemical compounds.

Question 14

a distinct substance formed by chemical
union of two or more elements in definite proportion by weight.

Answer 14

Chemical compound

Question 15

Subscripts represent the

Answer 15

number of atoms

Question 16

True or False: It is impossible for the same kind of atoms to combine in the same
proportion to form a different type of molecule.

Answer 16

False

Question 17

identical atoms bonding together with identical
proportions and differ only in arrangements.

Answer 17

Isomers

Question 18

isomers are identical atoms bonding together with identical
proportions and differ only in __________.

Answer 18

Arrangement

Question 19

Example of isomers

Answer 19

Ethyl alcohol ( CH3CH2OH)
Methyl ether (CH3OCH3

Question 20

are atoms (assemblies of atoms) that have a net electrical charge.

Answer 20

Ions

Question 21

ions that contain fewer electrons than protons have a net positive charge.

Answer 21

Cation

Question 22

ions that contain more electrons than protons have a net negative charge.

Answer 22

Anions

Question 23

contain both cations and anions in a ratio that
results in no net electrical charge.

Answer 23

Ionic Compounds

Question 24

electrons are shared between bonded
atoms and are simultaneously attracted to more than one nucleus.

Answer 24

Covalent compounds

Question 25

Contrast to covalent compounds, ionic compounds contain _________________ rather than
discrete neutral molecules.

Answer 25

Anions and cations

Question 26

Ionic Compounds are held together by

Answer 26

the attractive electrostatic
interactions between cations and anions.

Question 27

The cations and anions are
arranged in space to form

Answer 27

extended three-dimensional array that
maximizes the number of electrostatic interactions

minimizes the
number of repulsive electrostatic interactions.

Question 28

contain both cations in a ratio that results in zero
electrical charge.

Answer 28

Ionic compounds

Question 29

If the electrostatic energy is positive, the particles ________ each other;

Answer 29

Repel

Question 30

If the electrostatic energy is negative, the particles _________
each other.

Answer 30

are attracted to

Question 31

The name of a _______________ is simply the name of the element followed by
the word ion.

Answer 31

Monoatomic cation

Question 32

an ion’s positive charge is indicated by a roman numeral in
parentheses after the element name, followed by the word ion.

Answer 32

Stock System

Question 33

The ______________ uses two suffixes (-ic and -ous) that
are appended to the stem of the element name.

Answer 33

Common System

Question 34

The ____________ suffix represents the greater of the two cation charges,

Answer 34

-ic

Question 35

the _________ suffix represents the lower one.

Answer 35

-ous

Question 36

In many cases, the stem
of the element name
comes from the ________
name of the element.

Answer 36

Latin