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Chemical Reactions Unit Review

Total questions: 55

Worksheet time: 4hrs 53mins

Name
Class
Date
1.

Copper chloride (CuCl2) and aluminum react to produce aluminum chloride (AlCl3) and copper. Which of the following is the correctly balanced chemical equation for this reaction?

a)

CuCl2 + Al → AlCl3 + Cu

b)

3CuCl2 + Al→ AlCl3 + 2Cu

c)

3CuCl2 + 2Al → 2AlCl3 + 3Cu

d)

CuCl2 + 3Al → AlCl3 + 2Cu

2.

Give the reactants in the following equation:

CH4 + 2O2 → CO2 + H2O

a)

CH4 and CO2

b)

2O2 and CO2

c)

CH4 and 2O2

d)

2O2 and H2O

3.

Give the products in the following equation:

CH4 + 2O2 → CO2 + H2O

a)

CH4 and CO2

b)

2O2 and CO2

c)

2O2 and H2O

d)

CO2 and H2O

4.

Is this equation balanced?

N2 + 3H2 → 2NH3

a)

Yes - it is balanced

b)

No - it is not balanced

5.

Is this equation balanced?

Mg + O2 → MgO

a)

Yes - it is balanced

b)

No - it is not balanced

6.

2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

7.

2 NH3+ 1 H2SO4 ----> 1 (NH4)2SO4

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

8.

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

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

9.

1 Li3N + 3 NH4NO3 ----> 3 LiNO3 + 1 (NH4)3N

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

10.

CaCO3 ----> CaO + CO2

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

11.
__Al + __Fe3N2 -->__AlN + __Fe
a)
already balanced
b)
4,2,4,6
c)
2,1,2,3
d)
1,2,1,3
12.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
13.
__NaClO3 --> __NaCl + __O2
a)
2,2,2
b)
2,2,3
c)
3,2,2
d)
1,2,3
14.

What type of reactions is this:

C3H8 + O2 --> H2O + CO2

a)

Synthesis (combination)

b)

Decomposition

c)

Single replacement

d)

Combustion

e)

Double replacement

15.

Look at this chemical equation: _Na3PO4+_KOH --->

_NaOH + _ K3PO4

Which of the choices is correctly balanced?

a)

1 Na3PO4+3 KOH

--->

3 NaOH + 1 K3PO4

b)

2 Na3PO4+2 KOH

--->

3 NaOH + 1 K3PO4

c)

1 Na3PO4+2 KOH

--->

2 NaOH + 1 K3PO4

d)

3 Na3PO4+3 KOH

--->

3 NaOH + 1 K3PO4

16.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
17.

13. How many atoms is in this formula?

Na2 CO3

a)

3

b)

4

c)

5

d)

6

18.

What is the 'Law of Conservation of Matter'?

a)

It states that during a chemical reaction atoms get created

b)

It states that during a chemical reaction, atoms get destroyed or changed

c)

It states that during a chemical reaction, atoms rearrange, but, are never destroyed or created

d)

It states that during a chemical reaction, materials change phase

19.

Examine the reaction in the picture.

This equation is balanced because

a)

There is 1 carbon atom on each side

b)

There are 4 oxygen atoms on each side

c)

There are 4 hydrogens on each side

d)

The total number of atoms on each side is equal

e)

All of the above

20.

Which equation below matches the description above?

a)

2Na3PO4 + 3CaCl2 --> Ca3(PO4)2 + 6NaCl

b)

Ca3(PO4)2 + 6NaCl --> 2Na3PO4 + 3CaCl2

c)

CaPO4 + NaCl --> NaPO4 + CaCl

d)

NaPO4 + CaCl --> CaPO4 + NaCl

21.

When the product or reactant of an equation has been dissolved in water its state is referred to as ___________.

a)

solute

b)

solvent

c)

liquid

d)

aqueous

22.

4Si + S8 --> 2Si2S4

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

23.

Products that are formed in complete combustion reactions.

a)

CO and H2O

b)

CO2 and H2O

c)

H2 and H2O

d)

CO and H2

24.
The numbers needed to balance the equation are:
a)
2, 7, 6, 4
b)
2, 1, 3, 2
c)
1, 1, 3, 2
d)
2, 3, 1, 3
25.
Which of the following equations are correctly balanced?
a)
12CO2 +H2O --> C6H12O6 + O2
b)
CO2 + 9H2O --> C6H12O6 + O2
c)
CO2 + H2O --> 3C6H12O6 + O2
d)
6CO2 + 6H2O --> C6H12O6 + 6O2
26.
The numbers needed to balance the equation are:
a)
2, 7, 6, 4
b)
2, 1, 1, 2
c)
3, 1, 1, 3
d)
1, 6, 2, 6
27.
A chemical change in which a single compound breaks down into two or more simpler products is called a ______________________.
a)
single-replacement reaction
b)
synthesis reaction
c)
double-replacement reaction
d)
decomposition reaction
e)

Combustion

28.

A chemical change in which two or more substances react to form a new substance is a ____________________________.

a)

decomposition reaction

b)

synthesis reaction

c)

double replacement reaction

d)

combustion reaction

e)

single replacement reaction

29.

Which chemical reaction breaks down 1 reactant into 2 substances?

a)

Double replacement

b)

Single replacement

c)

Synthesis

d)

Decomposition

e)

Combustion

30.
Why is Cl2 + KI → KCl + I2 not a synthesis reaction?
a)
Oxygen is not a reactant in this reaction.
b)
The reaction has more than one reactant.
c)
Oxygen is not a product in this reaction.
d)
The reaction has more than one product.
31.

In the following equation, iron (Fe) has been replaced by __________________.

2Al + 3Fe(NO3)2 --> 3Fe + 2Al(NO3)3

a)

nitrate, NO3

b)

water, H2O

c)

aluminum, Al

d)

nitrogen , N

32.

In a double replacement reaction, MgCl2 and Sr(NO3)2 react to produce Mg(NO3)2 and ______.

a)

MgCl2

b)

NaNO3

c)

SrCl2

d)

HCl

33.

What is the balanced chemical equation when Ca reacts with Cu(SO4)?

a)

Ca + Cu2S --> Ca2S + Cu

b)

2Ca + 3CuSO4 --> Ca2(SO4)3 + 3Cu

c)

Ca + CuSO4 --> CaSO4 + Cu

d)

2Ca + Cu2SO4 --> Ca2SO4 + 2Cu

34.
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
35.
Balance this equation:
 __Li + __Cl2 -> __LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li +  Cl2 -> 2LiCl
36.

Hydrocarbon fuel + oxygen ----> ___+____

(Select 2)

a)

CO2

b)

O2

c)

H2O

d)

CxHy

37.
Write a Balanced Equation for this reaction:
C2H4 + 2 O2 -->
a)
C2O2 + H4
b)
CO2 + HOH
c)
CO + H
d)
2 CO2 + 2H2O
38.
What type of reaction is this?
2 C6H14 + 19 O2 --> 12 CO2 + 14 H2O
a)

Single Replacement

b)

Double Replacement

c)

Combustion

d)

Decomposition

e)

Synthesis

39.
Which of the following equations represents the balanced synthesis reaction of iron (III) and oxygen?
a)
Fe + 3 O2 → Fe2O3
b)
3 Fe + 3 O2 → 2 Fe2O3
c)
2 Fe + O2 → Fe2O3
d)
4 Fe + 3 O2 → 2 Fe2O3
40.
What are the correct formulas and coefficients for the products of the following single-replacement reaction?
Mg + Al(OH)3 →
a)
No Reaction
b)
Al + Mg(OH)3
c)
2 Al + 3 Mg(OH)2
d)
3 Al + MgOH3
41.
If an element is diatomic it should have a subscript of___
a)
2, always
b)
2, only when it is by itself
c)
it shouldn't have a subscript, it should have a coefficent
42.
in a reaction, aqueous barium chloride reacts with aqueous potassium carbonate to produce solid barium carbonate and aqueous potassium chloride. what is the correct balanced equation.
a)
Ba2Cl(aq) + KCO3(aq) --> BaCO3(s) + KCl(aq)
b)
BaCl2(aq) + K2CO3(aq) --> BaCO3(s) + 2KCl(aq)
c)
BaCl(aq) + K2CO3(aq) --> BaCO3(s) + K2Cl(aq)
d)
Ba2Cl2(aq) + KCO3(aq) --> Ba2CO3(s) + KCl2(aq)
43.

Write a balanced equation for this DR reactions [Fe has a charge of 3+ and NO3 has a charged of 1-]

NaOH + Fe(NO3)3 →

a)

NaFe + OH(NO3)3

b)

2NaNO3 + 3Fe(OH)3

c)

NaNO3 + FeOH

d)

3NaNO3 + Fe(OH)3

44.

What is the generic formula for a single replacement reaction? [ A is a metal]

a)

A + BC ---> CA + B

b)

A + BC ---> BC + A

c)

A + BC ---> AB + C

d)

A + BC ---> AC + B

45.

The symbol for a substance dissolved in solution is ______

a)

(s)

b)

(l)

c)

(aq)

d)

(g)

46.

What are the reactants?

sodium + water --> sodium hydroxide + hydrogen

a)

sodium and sodium hydroxide

b)

sodium and water

c)

water and hydrogen

d)

sodium hydroxide and hydrogen

47.

Chemical reactions yield _______.

a)

products

b)

reagents

c)

reactants

d)

all of the others

48.

What is the purpose of the arrow (-->) in a chemical equation?

a)

To separate reactants from reactants.

b)

To separate reactants from products.

c)

To separate products from products.

d)

This symbol is not used in a chemical equation.

49.

Identify the product(s) in this word equation

a)

Sodium

b)

Sodium chloride

c)

Sodium and Chlorine

d)

Sodium and sodium chloride

50.

What does this word equation represent: Iron + oxygen → Iron oxide

a)

A physical change in iron (nothing new gets made)

b)

A chemical reaction between iron and oxygen, where rust (iron oxide) is produced

c)

A chemical reaction between iron and rust, where oxygen is produced

d)

A physical change between iron and oxygen that forms a red color

51.

What state of matter is this substance?

a)

solid

b)

liquid

c)

gas

d)

aqueous

52.

In what state is this substance?

a)

solid precipitate

b)

dissolved in water

c)

released as a gas

d)

liquid

53.

_________can never be changed, since this would change the identity of the compounds

a)

subscripts

b)

superscripts

c)

coefficients

d)

chemical formulas

54.
How many Hydrogen are in 4H2O?
a)
6
b)

4

c)
2
d)

8

55.
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

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