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Test 8 - Chemical Reactions

Total questions: 50

Worksheet time: 2hrs 40mins

Name
Class
Date
1.

What part of the equation does the #1 represent?

a)

product

b)

produces/yields

c)

solid

d)

reactant

2.

The three (3) indicates which part of the equation?

a)

reactants

b)

products

c)

equation

d)

formulas

3.

The number four (4) represents which part of the equation?

a)

aqueous

b)

gas

c)

liquid

d)

solid

4.

Number five (5) is indicating ____ of the equation.

a)

solid

b)

liquid

c)

gas

d)

aqueous

5.

Number seven (7) is indicating ____ of the equation.

a)

reactants

b)

products

c)

equation

d)

formulas

6.

The process that leads to the chemical transformation of one set of chemical substances to another is called what?

a)

chemical equation

b)

physical change

c)

chemical reaction

d)

products

7.

What is a whole number that appears in front of a formula in a balanced chemical equation?

a)

subscript

b)

reactant

c)

coefficient

d)

product

8.

Hydrogen and oxygen chemically combine to produce water. What state of matter will oxygen be in the equation?

a)

gas

b)

liquid

c)

solid

d)

aqueous

9.

What is the symbolic representation of a chemical reaction in the form of symbols and formulas?

a)

chemical change

b)

chemical equation

c)

chemical reaction

d)

Law of Conservation of Mass

10.

How is the Law of Conservation of Mass satisfied in a chemical equation?

a)

the equation must use subscripts in the formulas

b)

the equation must create something new

c)

the equation must be balanced

d)

the equation must rearrange the atoms

11.

Mass can not be created nor destroyed: it can only be

a)

Destroyed a little bit

b)

Invisible

c)

changed in phase

d)

Transformed or rearranged

12.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
13.

The equation S8 + O2 --> SO3 can be described as what?

a)

skeleton equation

b)

balanced equation

c)

decomposition

d)

phase change

14.

When balancing chemical equations, you can only change what?

a)

subscripts

b)

formulas

c)

coefficients

d)

products

15.

CH4 + __O2 --> CO2 + H2O

What will the coefficient of the O2 be after balancing the equation?

a)

1

b)

2

c)

3

d)

4

16.

__CH4 + __O2 --> __CO2 + __H2O

What coefficients will balance the equation?

a)

1,1,1,1

b)

2,1,2,1

c)

1,4,1,2

d)

1,2,1,2

17.

__H2 + __O2 --> __H2O

What will the coefficient of the H2O be after balancing the equation?

a)

1

b)

2

c)

3

d)

4

18.

__H2 + __O2 --> __H2O

What coefficients will balance the equation?

a)

2,1,2

b)

1,1,2

c)

1,1,1

d)

2,2,2

19.

AlBr3 + __K2SO4 --> KBr + Al2(SO4)3

What is the coefficient of K2SO4 in the balanced equation?

a)

1

b)

2

c)

3

d)

4

20.

__P4 + O2 --> P2O5

What is the coefficient for P in the balanced equation?

a)

1

b)

2

c)

3

d)

4

21.

S8 + __O2 --> SO3

What is the coefficient for O2 in the balanced equation?

a)

6

b)

8

c)

12

d)

24

22.

NaBr + CaF2 --> NaF + CaBr2

What are the coefficients for the balanced equation?

a)

2,1,2,1

b)

1,2,1,2

c)

2,0,2,0

d)

4,2,4,2

23.

Na + H2O --> __NaOH + H2

What is the coefficient for NaOH in the balanced equation?

a)

1

b)

2

c)

3

d)

4

24.

Ag2O --> __Ag + O2

What is the coefficient for Ag in the balanced equation?

a)

1

b)

2

c)

3

d)

4

25.

KClO3 --> KCl + O2

What are the coefficients for the balanced equation?

a)

2,1,3

b)

2,1,1

c)

2,2,3

d)

1,1,3

26.
The following is what type of reaction:
PbCl2 + AgNO3 → Pb(NO3)2 + AgCl
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
27.
The following is what type of reaction:
NH3 + HCl  → NH4Cl
a)
Synthesis
b)
Decomposition
c)
Single Replacement Replacement
d)
Double Replacement Replacement
28.
What type of chemical reaction is this?
Al(OH)3 → Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
29.

3Ca + 2AlCl3 --> 3CaCl2 + 2Al

is what type of reaction?

a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
30.
Always starts with a Hydrocarbon that reacts with oxygen and produces carbon dioxide and water. 
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
31.

4Si   + S8   -->   2Si2S4

is what type of reaction?

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

32.

2Pb(NO3)2   -->   2PbO +  4NO2  +  O2

is what type of reaction?

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Combustion

33.

C4H12 + O2 → CO2 + H2O

is what type of reaction?

a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
34.

3KOH + H3PO4 --> K3PO4 + 3H2O

is what type of reaction?

a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Double displacement
35.
One element replaces another in a compound.
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
36.

Fe + H2SO4 --> Fe2(SO4)3 + H2

is what type of reaction?

a)

Synthesis (combination)

b)

Decomposition

c)

Single replacement

d)

Combustion

37.
Which of the following is the general formula for a decomposition reaction?
a)
A + B  → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
38.

If an element is diatomic it should have a subscript of___

a)

1, always

b)

2, only when it is an element

c)

it shouldn't have a subscript, it should have a coefficent

d)

2, when bonded in a compound

39.

How many Hydrogen atoms are in 4H2O?

a)

6

b)

8

c)

2

d)

4

40.

How many atoms are there TOTAL in H2SO4 ?

a)

6

b)

5

c)

7

d)

3

41.

How many Nitrogen atoms are in (NH₄)₂CrO₄?

a)

1

b)

2

c)

8

d)

16

42.

How many Hydrogen atoms in 3(NH₄)₂CrO₄?

a)

4

b)

2

c)

8

d)

24

43.
How many atoms of Oxygen are in Fe(NO3)3 ?
a)
6
b)
3
c)
9
d)
1
44.

Where are the numbers for a mole ratio found?

a)

They are part of the chemical formulas for the reactants / products.

b)

They are given in the problem.

c)

They are found on the periodic table for those elements.

d)

They are found as coefficients in the reaction's balanced chemical equation.

45.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

A problem asks how many moles of oxygen gas are needed to react completely with 6 moles of ethane (C2H6). What is the final answer for this problem?

a)

13 mol C2H6

b)

3 mol O2

c)

21 mol O2

d)

42 mol O2

46.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

New problem: If 3.5 moles of oxygen gas are used up as ethane combusts completely, how many moles of carbon dioxide are produced?

a)

0.5 mol CO2

b)

0.57 mol CO2

c)

2.0 mol CO2

d)

3.0 mol CO2

e)

3.5 mol CO2

47.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

New problem: How many moles of ethane (C2H6) are required to produce 13.5 moles of water from the above reaction?

a)

4.5 mol C2H6

b)

27 mol C2H6

c)

40.5 mol C2H6

d)

81 mol C2H6

e)

162 mol C2H6

48.

In the equation 2 Al2O3 --> 4 Al + 3 O2, what is the mole ratio of aluminum to oxygen?

a)
10:6 
b)
3:4
c)
4:3
d)
2:3
49.
H2+Cl2-->2HCl
How many moles of Cl2 are needed to react with 3 moles of H2?
a)
5
b)
2
c)
3
d)
6
50.

Mg + 2HCl → MgCl2 + H2

When 1 mole of HCl is used, how many moles of MgCl2 will be produced?

a)

2 mol

b)

1 mol

c)

0.5 mol

d)

4 mol

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