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Unit 8 Balancing equations

Total questions: 43

Worksheet time: 32mins

Name
Class
Date
1.

What is the name for the following compound? HCl

a)

Hydrogen chloride

b)

Hydrochloric acid

c)

Chloric Acid

2.

What is the name for the following compound? H2SO4

a)

Sulfuric Acid

b)

Hydrogen Sulfate

c)

Sulfurous Acid

d)

Hydrogen sulfide

3.

What type of reaction releases huge amount of energy?

a)

Combustion

b)

SIngle replacement

c)

Synthesis

d)

Decomposition

4.

This type of reaction uses an activity series to determine if it will occur.

a)

Double Replacement

b)

Combustion

c)

Single Replacement

d)

Synthesis

5.

If the reaction says it is heated, what symbol is used above the arrow?

a)

Nothing

b)

A square

c)

A triangle

d)

MnO2

6.

Nitric Acid

a)

H3N

b)

HNO3

c)

NO2

d)

Not shown

7.

Acetic Acid

a)

H2C2H3O2

b)

HC2H3O2

c)

HAc

d)

H2Ac

8.

HBr

a)

Hydrogen Bromide

b)

Bromic Acid

c)

Hydrobromic Acid

9.

Carbonic Acid

a)

HCO3

b)

H4C

c)

HC

d)

H2CO3

10.

The chemicals before the arrow are called

a)

Reactants

b)

Products

11.

In a chemical reaction the mass of the products must equal the mass of the reactants

a)

True

b)

False

12.

To balance equations what is added

a)

subscripts

b)

coefficients

13.

The coefficients must always be the same on both side of the arrow.

a)

True

b)

False

14.

To balance a chemical equation there must be the same number of each kind of atom on both sides of the arrow.

a)

True

b)

False

15.

The law of conservation of Mass say matter can not be created nor destroyed

a)

True

b)

False

16.

What represents Potassium metal in a chemical reaction?

a)

K (m)

b)

K (s)

c)

P (m)

d)

P (s)

17.

Which of the following means a chemical is dissolved in water?

a)

(l)

b)

(g)

c)

(aq)

d)

(d)

18.

What can mean a chemical reaction has occurred?

a)

Gas bubbles

b)

Temperature change

c)

Solid flakes are formed

d)

Color change

19.

This type of reaction will produce carbon dioxide and water as products.

a)

single replacement

b)

Synthesis

c)

Double replacement

d)

Combustion

20.

Element + Compound ---> Compound + Element

a)

Single replacement

b)

Double Replacement

c)

Synthesis

d)

Decomposition

21.

In this type of reaction the positive ions of the two compounds switch with each other.

a)

Double replacement

b)

Single replacement

c)

Decomposition

d)

Combustion

22.

If one reactant is breaking into different products, what type of reaction is that?

a)

Single replacement

b)

Double replacement

c)

decomposition

d)

Combustion

23.

Besides a hydrocarbon, what is the other reactant in a combustion equation.

a)

Oxygen

b)

Hydrogen

c)

water

d)

carbon dioxide

24.

What happens during a chemical reaction?

a)

new elements are created

b)

atoms are destroyed

c)

atoms are rearranged

d)

elements are destroyed

25.

In the following reaction, identify the products:

3Mg + 2FeCl3 →\rightarrow   2Fe + 3MgCl2

a)

Mg and Fe

b)

FeCl3 and MgCl2

c)

Mg and FeCl3

d)

Fe and MgCl2

26.

What symbol is used to represent the phrase “reacts with” in a chemical equation?

a)

an arrow

b)

a plus sign

c)

a coefficient

d)

an equal sign

27.

How many atoms of oxygen are represented in 2Ca(NO3)2?

a)

4

b)

6

c)

10

d)

12

28.

Balance the following equation. What coefficient should be used for manganese?

Al + MnO →\rightarrow   Al2O3 + Mn

a)

1

b)

2

c)

3

d)

4

29.

What type of reaction is this?

2C2H2 + 5O2 →\rightarrow   4CO2 + 2H2O?

a)

Single Replacement

b)

Double Replacement

c)

Combustion

d)

Decomposition

30.

What type of reaction is this?

H2 + Cl2 →\rightarrow   2HCl?

a)

synthesis

b)

decomposition

c)

double replacement

d)

single replacement

31.

Balance the following equation. What coefficient is in front of NH4NO3?

(NH4)2SO4 + Ba(NO3)2 → NH4NO3 + BaSO4

a)

1

b)

2

c)

3

d)

4

32.

What type of reaction is this?

(NH4)2SO4 + Ba(NO3)2 → NH4NO3 + BaSO4

a)

Synthesis

b)

Double replacement

c)

Single replacement

d)

Combustion

33.

What are the coefficients that would properly balance this equation?

__AgNO3 + __H2S --> __Ag2S+ __HNO3

a)

2,1 --> 1,2

b)

1,2 --> 1,1

c)

1,2 --> 1,2

d)

1,2 --> 2,1

34.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

35.

Will this reaction happen

_Cu +_HCl -->

a)

yes

b)

no

36.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
37.

What are the coefficients that would properly balance this equation?

__Al + __O2--> __Al2O3

a)

4,1 --> 2

b)

4,3 --> 4

c)

3,4 --> 1

d)

4,3 --> 2

38.

What type of reaction is this?

__Al + __O2--> __Al2O3

a)

Synthesis

b)

single replacement

c)

Decomposition

d)

double replacement

39.

Fill in the blanks with coefficient:

PCl5+_ H2O→_ HCl+H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

40.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
41.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
42.
Balance this equation:
P4+O2  -->  P2O3
a)
3 P4+ O2 --> 2 P2O3
b)
 P4+ O2 --> 2 P2O3
c)
 P4+ 3 O2 --> 2 P2O3
d)
 P4+ 2 O2 --> 3 P2O3
43.

What type of reaction is this?

H2SO4 ----> H2O + SO3

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Combustion

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