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Review Unit 5 Chemical Reactions

Total questions: 50

Worksheet time: 4hrs 10mins

Name
Class
Date
1.

The law of conservation of mass was established by ___, in the late 18th century.

a)

Albert Einstein

b)

Amedeo Avogadro

c)

John Dalton

d)

Antoine Lavoisier

e)

Neils Bohr

2.

Chemical formulas on the left side are called __.

a)

reactants

b)

products

c)

oxidizers

d)

reducers

3.

Chemical formulas on the right side are called __.

a)

reactants

b)

products

c)

oxidizers

d)

reducers

4.

The __ shows the direction of the reaction

a)

coefficient

b)

subscript

c)

arrow

d)

plus symbol

e)

state of matter

5.

The large numbers in front of the chemical formulas are called?

a)

coefficients

b)

products

c)

subscripts

d)

yeilds

e)

state of matter

6.

The small numbers written slightly below of the chemical formulas are called?

a)

coefficients

b)

products

c)

subscripts

d)

yeilds

e)

state of matter

7.

What do the (g) and (l) mean in the chemical equation?

a)

coefficients

b)

products

c)

subscripts

d)

yeilds

e)

state of matter

8.

What type of chemical reaction is shown?

a)

synthesis

b)

combustion

c)

single replacement

d)

decomposition

e)

acid-base neutralization

9.

What type of chemical reaction is shown?

a)

synthesis

b)

decomposition

c)

combustion

d)

single replacement

e)

double replacement

10.

Which of the reactions below are synthesis reactions? Two answers

a)

b)

c)

d)

11.

What type of reaction is shown?

a)

Synthesis

b)

Combustion

c)

Single replacement

d)

Double replacement

12.

What type of reaction has taken place? Silver nitrate and sodium chromate react and a reddish-brown solid forms.

a)

acid-base reaction

b)

decomposition reaction

c)

combustion reaction

d)

precipitation reaction

13.

What type of chemical reaction is shown?

a)

synthesis

b)

decomposition

c)

combustion

d)

single replacement

e)

double replacement

14.

What type of chemical reaction is shown?

a)

synthesis

b)

decomposition

c)

precipitate

d)

acid-base (neutralization)

e)

combustion

15.

Which of the elements in the following reaction has been reduced?

a)

Zinc

b)

Hydrogen

c)

Both Hydrogen and Zinc

d)

Neither Hydrogen nor Zinc

16.

Which is the change in the oxidation number of sulfur in the reaction shown?

a)

0

b)

+3

c)

+4

d)

+8

17.

Which of the following is a characteristic of a combustion reaction?

a)

Formation of a precipitate

b)

Absorption of heat

c)

Formation of a gas

d)

Release of heat and light

18.
Which equation best represents the law of conservation of mass? 
a)
A
b)
B
c)
C
d)
D
19.

The Law of Conservation of Mass states Matter is NEITHER created nor destroyed.

a)

True

b)

False

20.

The Law of Conservation of Mass states that the total mass of the reactants should be

a)

More than the mass of the products

b)

Equal to the mass of the products

c)

Ignored during the reaction

d)

Less than the mass of the products

21.

This is the decomposition reaction of hydrogen peroxide. According to the law of conservation of mass, if you start with 40g of hydrogen peroxide you should end up with _____g of water and oxygen combined.

a)

10

b)

20

c)

30

d)

40

22.

4 grams of hydrogen and 32 grams of oxygen will combine to form:

a)

36 grams of water

b)

28 grams of hydroxide

c)

32 grams of oxygen

d)

36 grams of deuterium

23.
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
24.
The numbers needed to balance the equation are:
a)
1, 1, 1, 2
b)
1, 1, 2, 2
c)
1, 1, 1, 1
d)
2, 3, 1, 3
25.

Is the chemical equation here balanced?

a)

Yes

b)

No

26.

When balanced, the correct coefficients for the equation are:

a)

2, 1, 3, 1

b)

1, 2, 1, 2

c)

1, 2, 2, 1

d)

2, 1, 1, 2

27.

When balanced, the correct coefficients for the equation are:

a)

3, 1, 2, 1

b)

1, 2, 3, 4

c)

2, 1, 2, 1

d)

1, 2, 1, 1

28.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
29.

To balance this equation, what coefficient belongs in the red box?

a)

3

b)

2

c)

1

d)

0

30.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

31.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

32.
What type of reaction is shown in the photo?
a)
Exothermic
b)
Isothermic
c)
Endothermic
d)
None of the  above
33.

What type of reaction is this?


2NaHCO3 --> Na2CO3 + H2O + CO2

a)

Single Replacement

b)

Combustion

c)

Decomposition

d)

Synthesis

34.

What type of reaction is this?


CH4 + 2O2 --> 2H2O + CO2

a)

Combustion

b)

Synthesis

c)

Double Replacement

d)

Single Replacement

35.

Identify the following process: We light a matchstick.

a)

Physical change

b)

Chemical change

36.

What type of reaction is this?

4 Fe + 3 O2 --> 2 Fe2O3

a)

Synthesis

b)

Combustion

c)

Single Replacement

d)

Decomposition

37.

What is the oxidation number for 'K' in KCl?

a)

-1

b)

+1

c)

0

d)

-2

38.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
39.
What is the oxidation of C in CH4?
a)
-4
b)
-1
c)
+4
d)
+1
40.

What is the oxidation state of H in H2?

a)

+2

b)

+1

c)

0

d)

None of the above

41.
What is oxidation number of P in K3PO4?
a)
+1
b)
+5
c)
-2
d)
0
42.

What is the oxidation number of H in H2O?

a)

-1

b)

+1

c)

+2

d)

-2

43.
What is the oxidation number of N in NO2-1?
a)
-3
b)
+4
c)
-2
d)
+3
44.

What is the oxidation number for Oxygen?

a)

+1

b)

+2

c)

-1

d)

-2

45.

What is the oxidation number for elements in Group 2?

a)

+1

b)

+2

c)

-1

d)

-2

46.

Give the oxidation number of Nitrogen and Oxygen in N2O molecule.

a)

Nitrogen +1, Oxygen -2

b)

Nitrogen -1, Oxygen -2

c)

Nitrogen +2, Oxygen -2

d)

Nitrogen -3, Oxygen -2

47.

What is the oxidation number of chlorine in HClO?

a)

0

b)

-1

c)

+1

d)

+5

48.
What is oxidation number of O in O2 ?
a)
0
b)
-2
c)
+1
d)
+2
49.

What is the oxidation state of Cu in Cu2+?

a)

-1

b)

-2

c)

+2

d)

0

50.

What is the oxidation number of chlorine in KCl?

a)

+1

b)

-1

c)

+5

d)

+7

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