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UNIT 3 REVIEW: Chemistry

Total questions: 44

Worksheet time: 22mins

Name
Class
Date
1.

Two or more elements that are chemically combined is a(n)

a)

Compound

b)

Element

c)

Bond

d)

Solution

2.

A ________________ tells what elements and how many of each element are in a unit of that compound.

a)

Chemical formula

b)

Reactant

c)

Product

d)

Coefficient

3.

This rule states that atoms will gain, lose, or share electrons in order to have 8 electrons in their outer shell

a)

Octet Rule

b)

Oxidation rule

c)

Conservation of Mass

d)

Conservation of Energy

4.

A force that holds atoms together is a

a)

Chemical Bond

b)

Chemical Reaction

c)

Chemical Equation

d)

Chemical formula

5.

When atoms transfer electrons in order to be stable it is a (n) ____________

a)

Ionic bond

b)

Covalent bond

c)

Oxidation number

d)

Ion

6.

When atoms share electrons in order to be stable it is a (n)

a)

Ionic bond

b)

Covalent bond

c)

Oxidation number

d)

Ion

7.

Charged atoms that have gained or lost electrons are

a)

Ions

b)

Ionic bonds

c)

Covalent bonds

d)

Oxidation numbers

8.

The charge on an ion is the

a)

Ionic bond

b)

Covalent bond

c)

Oxidation number

d)

Octet

9.

An atom with a positive charge is a (n)

a)

Ion

b)

Cation

c)

Anion

d)

Oxidation number

10.

An atom with a negative charge is a(n)

a)

Ion

b)

Cation

c)

Anion

d)

Oxidation number

11.

How many electrons do most elements need to be stable?

a)

2

b)

4

c)

6

d)

8

12.

Which group of elements is already stable?

a)

Noble gases

b)

Halogens

c)

Alkali metals

d)

Alkaline earth metals

13.

Group 18 elements on the periodic table are stable because they

a)

Have 8 valence electrons

b)

Have 8 energy levels

c)

Have 6 valence electrons

d)

Have an oxidation number = 8

14.

CaCl2 has ______ atoms of calcium

a)

1

b)

2

c)

3

d)

4

15.

CaCl2 has ______ atoms of chlorine

a)

1

b)

2

c)

3

d)

4

16.

Na2SO4 has how many atoms of sodium?

a)

1

b)

2

c)

3

d)

4

17.

Na2SO4 has how many atoms of sulfur?

a)

1

b)

2

c)

3

d)

4

18.

Na2SO4 has how many atoms of oxygen?

a)

1

b)

2

c)

3

d)

4

19.

Al2(SO4)3 has how many atoms of aluminum?

a)

2

b)

3

c)

12

d)

6

20.

Al2(SO4)3 has how many atoms of sulfur?

a)

2

b)

3

c)

12

d)

6

21.

Al2(SO4)3 has how many atoms of oxygen?

a)

2

b)

3

c)

12

d)

6

22.

CCl4 has how many atoms of carbon?

a)

1

b)

2

c)

3

d)

4

23.

CCl4 has how many atoms of chlorine?

a)

1

b)

2

c)

3

d)

4

24.

A process by which the atoms of one or more substances are rearranged to form different substances is called a(n) ___________________

a)

Chemical formula

b)

Chemical equation

c)

Chemical reaction

d)

Chemical solution

25.

The compounds that are present at the beginning of a chemical reaction are called the ________________

a)

Products

b)

Reactants

c)

Formula

d)

Ions

26.

The compounds that are present at the end of a chemical reaction are called the ________________

a)

Products

b)

Reactants

c)

Formula

d)

Ions

27.

The state of reactants or products in a reaction is labeled with small letters such as g for gas and s for solid. Aq indicates aqueous which means _________________

a)

dissolved in water

b)

does not dissolve in water

c)

a combination of water and other substances

d)

plasma plus water

28.

Three examples of chemical changes are

a)

burning, rusting, decomposing

b)

boiling, rusting, decomposing

c)

freezing, boiling, decomposition

d)

melting, freezing, rusting

29.

The amount of reactants you start with should equal the amount of products you end with is an example of __________________

a)

The law of entropy

b)

String theory

c)

The law of conservation of mass

d)

The law of conservation of energy

30.

In a chemical reaction, the ________________ can be changed.

a)

Subscripts

b)

Superscripts

c)

Coefficients

d)

Elements

31.

What are 3 examples of evidence that a chemical reaction has occurred?

a)

precipitate, odor change, release of light

b)

change of state, odor change, release of light

c)

fracture, odor change, change of state

d)

dissolving, fracture, odor change

32.

An insoluble compound that comes out of solution is a _____________

a)

precipitate

b)

reactant

c)

product

d)

molecule

33.

Chemical reactions that give off heat are called______________

a)

exothermic

b)

endothermic

c)

synthesis

d)

combustion

34.

Chemical reactions that absorb heat are called______________

a)

exothermic

b)

endothermic

c)

synthesis

d)

combustion

35.

When 2 or more reactants form 1 product the reaction is a ____________

a)

synthesis reaction

b)

combustion reaction

c)

single replacement reaction

d)

double replacement reaction

36.

When one reactant breaks down into 2 or more products the reaction is a ______________

a)

synthesis reaction

b)

decomposition reaction

c)

combustion reaction

d)

double replacement reaction

37.

When something is burned the reaction is a ______________

a)

synthesis reaction

b)

decomposition reaction

c)

combustion reaction

d)

double replacement reaction

38.

When one element reacts with one compound and swaps, making one new compound and one new element the reaction is a ______________

a)

synthesis reaction

b)

double replacement reaction

c)

combustion reaction

d)

single replacement reaction

39.

When two compounds react to form two new compounds and a precipitate is formed the reaction is a ______________

a)

synthesis reaction

b)

double replacement reaction

c)

combustion reaction

d)

single replacement reaction

40.

2AlBr3  +  3K2SO4  --> 6KBr +  Al2(SO4)3 is a _____________ reaction

a)

Single replacement

b)

double replacement

c)

synthesis

d)

decomposition

41.

4Al  +  3O2  -->   2Al2O3 is a _____________ reaction

a)

Single replacement

b)

double replacement

c)

synthesis

d)

decomposition

42.

2LiCl  +  Br2 --> 2LiBr  +  Cl2 is a _____________ reaction

a)

Single replacement

b)

double replacement

c)

synthesis

d)

decomposition

43.

2NF3  -->  N2  +  3F2 is a _____________ reaction

a)

Single replacement

b)

double replacement

c)

synthesis

d)

decomposition

44.

Pb(OH)2  +  2HCl -->  2H2O  +  PbCl2 is a _____________ reaction

a)

Single replacement

b)

double replacement

c)

synthesis

d)

decomposition

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