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Balancing Chemical Equations- HONORS

Total questions: 45

Worksheet time: 59mins

Name
Class
Date
1.

What is the Law of Conservation of Mass?

a)

It states that matter cannot be created or destroyed.

b)

It states that energy cannot be created or destroyed.

c)

It states that matter can be created or destroyed.

d)

It states that sound can be created or destroyed.

2.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
3.
What is the part of the chemical equation in green called? 
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
4.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
5.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
6.
Which problem is balanced?
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
7.
Element or compound?
H2O
a)
element
b)
compound
8.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
9.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
10.

Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe

a)

yes

b)

no

11.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

12.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
13.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
14.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
15.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
16.
Is the following reaction balanced?
2CH3OH + 3O2 --> 2CO2 + 4H2O
a)
yes
b)
no
17.

What is the total number of atoms present in 5Na3PO4?

a)

5

b)

55

c)

40

d)

8

18.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

19.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

20.

Is the following equation balanced?

2C2H2 + 5O2 ---> 4CO2 + 2H2O

a)

YES

b)

NO

21.
What are the larger numbers that you CAN CHANGE in a chemical equation? 
a)
Coefficient 
b)
Products
c)
Reactants
d)
Subscripts
22.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
23.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
24.
Balance this chemical reaction......?  
__H2O2 ---->  __H2O + O2
a)
2H2O2  //  2H2O
b)
1H2O2  //  2H2O
c)
2H2O2  //  1H2O
d)
H2O2  //  2H2O
25.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
26.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
27.

The coefficient in 3 H2O is

a)

6

b)

5

c)

2

d)

3

28.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
29.

How many Sodium (Na) are in 6 NaCl?

a)

1

b)

12

c)

6

30.

How many Hydrogen are in 4 H2O?

a)

6

b)

8

c)

2

d)

4

31.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
32.

__ P4 + __ O2 -----> ____P2O5

a)

1, 5, 2

b)

2, 5, 7

c)

2, 1, 5

d)

5, 1, 2

33.

___ Al + ___ Br2 -----> ____ AlBr3

a)

3, 2, 2

b)

2, 3, 2

c)

3, 2, 2

d)

1, 2, 3

34.

___ Cr + ___O2 -----> ____ Cr2O3

a)

3, 2, 4

b)

2, 3, 4

c)

2,1, 5

d)

4, 3, 2

35.

___ AlBr3 + ___ Cl2 ----> ___ AlCl3 +___ Br2

a)

2, 2, 3, 3

b)

2, 3, 2, 3

c)

2, 3, 3, 2

d)

1, 2, 3, 4

36.

___ NaClO3 ----> ___ NaCl + ___ O2

a)

1, 3, 2

b)

2,3,2

c)

2, 2,3

d)

3, 2, 2

37.

___ H2 +___O2 ----> ____ H2O

a)

1, 2, 2

b)

2, 2, 1

c)

1, 2, 3

d)

2, 1, 2

38.

____ H2 + ____ N2 ----> ____ NH3

a)

1, 2, 3

b)

3, 1, 2

c)

3, 2, 1

d)

1, 3, 2

39.

____ KClO3 ----> ____ KCl + ____ O2

a)

3, 2, 2

b)

2, 3, 2

c)

2, 2, 3

d)

2, 3, 4

40.

Which best represents a balanced equation?

a)

120 grams of carbon plus 20 grams of oxygen → 200 grams of carbon dioxide

b)

120 grams of carbon plus 50 grams of oxygen → 200 grams of carbon dioxide

c)

120 grams of carbon plus 80 grams of oxygen → 200 grams of carbon dioxide

41.

Which is best represented by the equation?

2Mg + O2 2MgO

a)

Law of Conservation of Energy

b)

Law of Conservation of Mass

c)

Law of Superposition

42.

A chemistry teacher combines 20 grams of lemon juice with 25 grams of baking soda in a flask covered with a balloon. The flask and balloon have a combined mass of 105 grams. What is the mass of the entire setup after a reaction has occurred?

a)

45 g

b)

150 g

c)

605 g

43.

The equation below shows a reaction between sodium (Na) and water (H2O).

2Na (s) + H2O (l) → 2NaOH (aq) + H2 (g)

Which best explains why the equation is not balanced?

a)

There is too much sodium in the reactants.

b)

There is not enough water in the reactants.

c)

There is too much hydrogen gas in the products.

d)

There is not enough sodium hydroxide in the products.

44.

What coefficient for O2 demonstrates the law of conservation of mass?


CH4(g) + __O2(g) → CO2(g) + 2H2O(g)

a)

1

b)

2

c)

3

d)

4

45.

Which best describes how to balance the chemical equation shown below to support the law of conservation of mass?

Mg + O2 → MgO

a)

Add the coefficient 2 before the Mg on both sides of the equation.

b)

Add the coefficient 2 before the O2 on the left side of the equation.

c)

Add the coefficient 2 before the Mg on the left side of the equation.

d)

Add the coefficient 2 before the MgO on the right side of the equation.

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