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Balancing Equations and Types of Reactions

Total questions: 40

Worksheet time: 1hrs 7mins

Name
Class
Date
1.

What are the coefficients for: Al + HCl --> AlCl3 + H2?

a)

2,2,2,3

b)

2,1,6,3

c)

2,6,2,3

d)

3,6,2,3

2.

Balance this equation-
__P4+ __O2--> __P2O3

a)

it is already balanced

b)

2, 1, 3

c)

1, 2, 3

d)

1, 3, 2

3.

Balance this equation: _N2 + _H2 --> _NH3

a)

1,2,3

b)

1,3,2

c)

1,1,2

d)

2,1,1

4.

What is the little number after an element in a chemical equation called? Example: H2

a)

Coefficient

b)

Subscript

c)

Atom

d)

Equation

5.

What is the arrow in a chemical equation...
H2 + O --> H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

6.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
7.

When balancing equations, a ____ can be placed to the left of a formula of a substance to make the equations balanced.

a)

charge

b)

subscript

c)

random number

d)

coefficient

8.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
9.

Which side of a chemical equation is the product side?

a)

Left (before the yields sign)

b)

Right (after the yields sign)

10.

Which problem is balanced?

a)

PbO2 + 2H2

b)

SO2 + H2O --> H2SO4

c)

2Na + 2H2O --> 2NaOH + H2

11.
4Si + S8 --> 2Si2S4
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Double displacement
12.

3Ca + 2AlCl3 --> 3CaCl2 + 2Al

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Double displacement

13.

3KOH + H3PO4 --> K3PO4 + 3H2O

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Double displacement

14.

2Pb(NO3)2 --> 2PbO + 4NO2 + O2

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

15.

3Mg + N2 --> Mg3N2

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

16.

2Fe + 3H2SO4 --> Fe2(SO4)3 + 2H2

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

17.

The number of atoms you begin with in a chemical reaction must be the same as the number of atoms you end with.

a)

must be the same as the number of atoms you end with

b)

must be an even number

c)

can be different to the number you finish with

d)

changes depending on how much energy is formed

18.
Which type of reaction is: C2H4 + 3 O2 → 2 CO2 + 2 H2O
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
19.

Which type of reaction is: 2 H3AsO4 → As2O5 + 3 H2O?

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Combustion

20.

Which type of reaction is: 3 Pb + 2 H3PO4 → 3 H2 + Pb3(PO4)2?

a)

Synthesis

b)

Single Displacement

c)

Double Displacement

d)

Combustion

21.

Why is the following chemical equation not balanced?
H2 + O2 --> H2O

a)

each side of the equation has a different number of oxygen atoms

b)

each side of the equation has a different number of hydrogen atoms

c)

each side has the same mass

22.

In the following reaction, what sign indicates that a precipitation reaction took place?
AgNO3 (aq) + NaOH (aq) → AgOH (s) + NaNO3 (aq)

a)

The formation of a nitrate

b)

The (aq), meaning aqueous or dissolved in water

c)

The (s), meaning the formation of a solid

d)

The base (OH) reactant

23.

What are Chemical Reactions?

a)

It's when you mix substances.

b)

A process in which atoms rearrange to form new substances

c)

When something bubbles.

d)

Letters and numbers showing the types and number of atoms

24.

What reaction has the following general formula: AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

25.

What reaction has the following general formula: A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

26.

What reaction has the following general formula: AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

27.

KOH + H3PO4 --> K3PO4 + H2O

a)

Synthesis (combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

28.
Si + S8 --> Si2S4
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
29.
Pb(NO3)2 --> PbO + NO2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
30.

3 Pb + 2 H3PO4 ----> 3 H2 + 1 Pb3(PO4)2

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

31.

Ca3(PO4)2 + 3 H2SO4 → 3 CaSO4 + 2 H3(PO4)

a)

Synthesis Reaction

b)

Decomposition Reaction

c)

Single Displacement Reaction

d)

Double Displacement Reaction

32.
Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
33.

Consider the equation 4 Fe + 3 O2 → 2 Fe2O3. In this equation, 3 O2 is a

a)

product

b)

reactant

c)

compound

34.
2 AgNO3 + Cu ----> Cu(NO3)2 + 2 Ag
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
35.

What type of reaction involves the breaking down of a substance into simpler substances?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

36.

What type of reaction involves 2 substances combining to form 1 new compound?

a)

Decomposition Reaction

b)

Single Displacement Reaction

c)

Double Displacement Reaction

d)

Synthesis Reaction

37.

What type of reaction involves one element replacing another element in a compound?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

38.

What type of reaction involves ions from two compounds exchanging places to form two completely new compounds?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

39.

What are the reactants in the chemical equation pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and H2O

d)

O2 and H2O

40.

What are the products of the chemical reaction pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and H2O

d)

O2 and H2O

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