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Chapter 7 Chemical Reactions

Total questions: 60

Worksheet time: 37mins

Name
Class
Date
1.
2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
2.
2 NH3+ 1 H2SO4 ----> 1 (NH4)2SO4
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
3.
3 Pb + 2 H3PO4 ----> 3 H2 + 1 Pb3(PO4)2
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
4.
Pb + FeSO4 ----> PbSO4 + Fe
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
5.
CaCO3 ----> CaO + CO2
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
6.
P4 +  3 O2 ----> 2 P2O3
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
7.

What reaction has the following general formula:

AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

8.

What reaction has the following general formula:

A + B --> AB

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

9.

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

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

10.

What is the general reaction scheme for a combustion  reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

11.
What types of reactions absorb and release heat?
a)
acidic and basic
b)
endothermic and exothermic
c)
endothermic and heat transfusion
d)
covalent and ionic
12.
Which of the following is a chemical change?
a)
water freezes to form ice
b)
sugar dissolves in water
c)
gasoline burns in a car engine
d)
a piece of metal expands when it is heated
13.
In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.
a)
reactants
b)
products
c)
neutrals
d)
energizers
14.
A change in the shape of an object is an example of _________________.
a)
a chemical change
b)
energy
c)
an endothermic change
d)
a physical change
15.

glass breaking....

a)

physical change

b)

chemical change

16.

hammering wood together to build a playhouse

a)

physical change

b)

chemical change

17.

a bicycle rusting

a)

physical change

b)

chemical change

18.

separating sand from gravel

a)

physical change

b)

chemical change

19.

spoiling food

a)

physical change

b)

chemical change

20.

mixing lemonade powder into water

a)

physical change

b)

chemical change

21.

corroding metal

a)

physical change

b)

chemical change

22.

bleaching your hair

a)

physical change

b)

chemical change

23.

frying an egg

a)

physical change

b)

chemical change

24.

fireworks exploding

a)

physical change

b)

chemical change

25.

freezing chocolate covered bananas

a)

physical change

b)

chemical change

26.
Water freezing into ice is an example of a...
a)
Physical Change
b)
Chemical Change
27.
A change that alters the physical properties of a substance without changing its composition.
a)
Physical Change
b)
Chemical Change
28.
A change that alters the physical properties of a substance without changing its composition.
a)
Physical Change
b)
Chemical Change
29.
Which of the following DOES NOT indicate a chemical change/reaction is occurring?
a)
Color Change
b)
Formation of a Precipitate
c)
Formation of gas/bubbles
d)
State of matter change
30.
We use chemical equations to show what happens in a....
a)
Chemical Change
b)
Physical Change
31.
What are the two factors to look for when determining if the reaction is at equilibrium?
a)
Forward reaction rate is faster than the reverse and concentrations are equal
b)
Forward and reverse reaction rates are equal and concentration is conctant
c)
Forward and revers reaction rates are equal and concentration is equal
d)
Forward reaction rate is faster than the reverse and concentration is equal
32.
This symbol indicates that a reaction is ____________
a)
reversible
b)
irreversible
33.
When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in
a)
Chemical Equilibrium
b)
Chemical Balance
c)
Chemical Constant
d)
Chemical Reaction
34.
Define chemical equilibrium.
a)
A reaction is reversible.
b)
The concentration of the reactants is equal to the concentration of the products.
c)
The rate of a forward reaction is equal to the rate of the reverse reaction.
d)
The reaction stops and no further change in concentration occurs.
35.
During equilibrium, the rates of the forward and the reverse reaction are ________
a)
the same 
b)
unequal
c)
unequal for exothermic reactions
d)
unequal for endothermic reactions
36.
If a reaction is reversible and has reached equilibrium, what can be said about the amounts of reactants and products?
a)
some reactant, some product
b)
no reactant, all product
c)
all reactant, no product
37.
The ability to burn is a ___ property.
a)
physical
b)
chemical
c)
conservitive
d)
reversed
38.
2H2O + Na2 ---> 3Na2O2H
How many hydrogen atoms are on the reactants side of the equation?
a)
2
b)
3
c)
4
d)
6
39.

2H2O + S2 ---> 4SO2

How many sulfur (S) atoms are on the products' side of the equation?

a)

2

b)

3

c)

4

d)

6

40.

2H2O + S2 ---> 4SO2

What is the number four called in front of the SO2?

a)

subscript

b)

coefficient

c)

median

d)

reactant

41.
How many atoms of oxygen are in the reactants?
a)
3
b)
2
c)
6
d)
5
42.
What is the arrow pointing to?
a)
coefficient
b)
subscript
c)
banana
d)
a number
43.
What are the arrows pointing to?
a)
coefficient
b)
subscript
c)
pineapple
d)
a number
44.
Ag(NO3)2 + HCl --> HNO3 + AgCl2
What are the reactants in the above reaction?
a)
Ag(NO3)2 + HCl
b)
HNO3 + AgCl2
c)
HCl + HNO3
d)
Ag(NO3)2 + AgCl2
45.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
46.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
47.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
48.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
49.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
50.
The blue atoms are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
51.
The atoms along the staircase are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
52.
What is the "large" number that you CAN CHANGE in a chemical equation? 
a)
Subscript 
b)
Coefficient
c)
Product
d)
Reactant 
53.
What is the small number that you CANNOT CHANGE in a chemical equation? 
a)
Subscript
b)
Coefficient
c)
Product
d)
Reactant 
54.
What type of chemical reaction is this? 
Mg + 2HCl -----> MgCl2 + H2
a)
Synthesis
b)
Decomposiition
c)
Single Replacement
d)
Double Replacement
55.
What type of reaction is this one? 
AB + CD ------->  AD + CB
OR
AB + CD ------>  AC + BD
a)
Combustion
b)
Double Replacement
c)
Single Replacement
d)
Decomposition 
56.
What are the products in this equation? 
Mg + 2HCl ---->  MgCl2  + H2
a)
Mg + 2HCl 
b)
2HCl and MgCl2
c)
 MgCl2 + H2
d)
H2 and Mg
57.
What are the reactants in this equation? 
Mg + 2HCl ----->  MgCl2 + H2
a)
Mg + 2HCl 
b)
2HCl and MgCl2
c)
 MgCl2 + H2
d)
H2 and Mg
58.

How many atoms of Hydrogen are in H2O

a)

1

b)

2

c)

3

d)

more than 3

59.

How many different elements are present in H2COCH2

a)

5

b)

4

c)

3

d)

2

60.

Calculate the number of Oxygen atoms in Al(OH)3

a)

1

b)

2

c)

3

d)

4

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