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Chemical Reactions Quiz

Total questions: 40

Worksheet time: 50mins

Name
Class
Date
1.

What reaction has the following general formula:

A + CD --> C + AD

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

e)

Combustion

2.

What reaction has the following general formula:

AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

e)

Combustion

3.

What reaction has the following general formula:

A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

e)

Combustion

4.

What reaction has the following general formula: CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

5.

What type of reaction is the following: BaCl2+2KI −> 2KCl + BaI2BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2  

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

e)

Combustion

6.

What type of reaction is the following: 2KI −> 2K + I22KI\ ->\ 2K\ +\ I_2  

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

e)

Combustion

7.

What type of reaction is the following: Zn + 2HCl −> ZnCl2+H2Zn\ +\ 2HCl\ ->\ ZnCl_2+H_2

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

e)

Combustion

8.

What are the larger numbers that you CAN CHANGE in a chemical equation? 

a)

Coefficients 

b)
Products
c)
Reactants
d)
Subscripts
9.

How many HCl molecules do you need to balance this equation?  Mg +  __HCl --->  MgCl2 + H2

a)
1
b)
2
c)
3
d)
4
10.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
11.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)

Equation

d)
Reaction
12.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
13.
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
14.

__KNO3 --> __KNO2 + __O2 What coefficients are needed to balance the reaction?

a)

2, 2, 1

b)

2, 3, 2

c)

1, 2, 2

d)

1, 3, 1

15.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
16.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
17.

2Ca + O2 →\rightarrow  2CaO

a)

Single Replacement - anionic

b)

Double Replacement

c)

Combustion

d)

Decomposition

e)

Synthesis

18.

2(NH4)3PO4 + 3Sr(OH)2 →\rightarrow  Sr2(PO4)2 + 6NH4OH

a)

Single Replacement - cationic

b)

Double Replacement

c)

Combustion

d)

Decomposition

e)

Synthesis

19.

2C6H6 + 15O2 →\rightarrow  12CO2 + 6H2O

a)

Single Replacement - anionic

b)

Double Replacement

c)

Combustion

d)

Decomposition

e)

Synthesis

20.
After you mix two substances together, a new substance forms.  This is an example of:
 
a)
 Physical Change
b)
 Chemical Change
21.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
22.

How many Oxygen atoms are in H2O?

a)

1

b)

2

c)

0

d)

4

23.

How many Hydrogen atoms are in 4H2O?

a)

6

b)

8

c)

2

d)

4

24.

How many Oxygen atoms are in Al₂(SO₄)₃?

a)

4

b)

12

c)

7

d)

24

25.

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

a)

1

b)

2

c)

8

d)

16

26.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
27.
Balance this reaction: ____ NaF + ____ Br2 ---> ____ NaBr + ____ F2
a)
3,1,2,1
b)
1,2,3,4
c)
2,1,2,1
d)
1,2,1,2
28.
__H2O2 --> __H2O + __O2
a)
already balanced
b)
2,1,1
c)
2,2,1
d)
2,1,2
29.
Balance this equation:
Al2O3 -> Al + O2 
a)
2Al2O3 -> 2Al + 3O2 
b)
2Al2O3 -> 4Al + 3O2 
c)
3Al2O3 -> 2Al + O2 
d)
2Al2O3 -> 3Al + 2O2 
30.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
31.
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
32.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

33.

A student heated a 10 gram sample of a chemical in an open container. A chemical reaction occurred, and the mass of the sample was measured again. The mass of the sample was found to be less than before the reaction. Which of the following best explains the decrease in mass of the sample?

a)

The heat caused the chemical to become less dense.

b)

The reaction gave off more heat than was added.

c)

Some of the lighter particles were destroyed.

d)

Some of the particles escaped as a gas formed.

34.

A student dissolved 25 grams of salt into 1,000 grams of water. What should the mass of the saltwater mixture be?

a)

975 grams

b)

1,000 grams

c)

1,025 grams

d)

2,500 grams

35.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
36.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
37.
Element or compound?
H2O
a)
Element
b)
Compound
38.
Element or compound?
O2
a)
Element
b)
Compound
39.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
40.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no

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