Unit Test 2 Review

Question 1

Covalent bond

Answer 1

Formed by the sharing of electrons between atoms.

Question 2

Molecule

Answer 2

Neutral group of atoms joined together by a covalent bond.

Question 3

Diatomic molecule

Answer 3

Molecule consisting of two atoms of the same element.

HOFBrICl

Question 4

Molecular compound

Answer 4

Compound composed of molecules

Question 5

Formula unit

Answer 5

The lowest whole number ratio of ions in an ionic compound.

Question 6

What are the ten prefixes used in molecular compounds?

Answer 6

Mono
Di
Tri
Tetra
Penta
Hexa
Helta
Octa
Nona
Deca

Question 7

How are cations named?

Answer 7

Name of metal followed by the word ion or cation.

Ex: ca 2+= calcium ion(cation)

Question 8

How are anions named?

Answer 8

Stem of the nonmetal with the suffix ide. Followed by anion.

Example: S 2- = sulfide anion

Question 9

Polyatomic ion

Answer 9

Is composed of more than one atom, but behaves as one unit with one charge.

Ex: Ammonium= NH4+

Question 10

What does an -ite and -ate ending tell us?

Answer 10

• ite ending means their is one less oxygen atom.
• ate ending means their is one more oxygen atom than an ite ending.

Example= SO4 2- = sulfate SO3 2-= sulphite

Question 11

Monoatomic ion

Answer 11

A single atom with a positive or negative charge resulting from the lose or gain of valence electrons.

Question 12

Binary compound

Answer 12

A compound composed of two elements.

Ex: AlBr3

Question 13

What are the 4 Symbols to indicate state?

Answer 13

S= solid
G=gas
L=liquid
Aq= aqueous(dissolved in water)

Question 14

What are the five types of reactions?

Answer 14

Synthesis
Decomposition
Single replacement
Double replacement
Combustion

Question 15

Most decomposition reactions require —

Answer 15

Heat

Forms of heat, light, or electricity

Question 16

What are three possibilities for predicting double replacement reactions?

Answer 16

1. Precipitate forms in a solution
2. One of the products is a gas
3. One product is a molecular compound such as water.

Question 17

Compound

Answer 17

A combination of elements bonded chemically either ionic or covalent.

Question 18

Describe molecular compounds

Answer 18

Atoms shared
Bond known as a covalent bond
Occurs between non metals

Question 19

Describe ionic compounds

Answer 19

Metal and non metal
Occurs when 1 element gains or looses valence electrons.
Attraction
Chemical formula is known as the formula unit.

Question 20

What are the three ways to describe chemical reactions?

Answer 20

Word equation
Skeleton equation
Balanced equation

Question 21

Pt

Answer 21

Catalyst - substance that increases chemical reaction speed.

not part of chemical formula

Question 22

Synthesis

Answer 22

Combining 2 or more reactants to form a single new product.

A+B—>AB

Question 23

Decomposition

Answer 23

Breaking down a larger reactant into two or more simple products.

AB—>A+B

Question 24

Single replacement

Answer 24

A reactive element replaces a less reactive element in a compound.

A+BC—>AC+B

Question 25

Double replacement

Answer 25

Two ionic compounds form two New Ionic compounds.

AB+CD—>AD+CB

Question 26

Combustion

Answer 26

A hydro carbon and oxygen react to form carbon dioxide and water in the presence of heat.

CH+O2—> H20+CO2

Question 27

What reaction are fireworks and what reaction is used for dynamite?

Answer 27

Fireworks- combustion because they need oxygen to work.

Dynamite-decomposition, because it does not require oxygen.