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WorksheetsBalancing Chemical Equations review
Total questions: 30
Worksheet time: 28mins
Name
Class
Date
1.
Read the following chemical formula: C6H12O6. How many hydrogen atoms are in the formula?
a)
12
b)
6
c)
4
2.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
3.
How many Hydrogen atoms are in H2O?
a)
zero
b)
one
c)
two
d)
three
4.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
5.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
6.
Which of the following is NOT an element?
a)
H2O
b)
H2
c)
O2
d)
Au
7.
Smallest unit of an element
a)
compound
b)
atom
c)
molecule
d)
product
8.
Substances that form as the result of a chemical reaction
a)
products
b)
reactants
c)
coefficients
d)
subscripts
9.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
10.
How many iron atoms are in
Fe(NO3)2
Fe(NO3)2
a)
1
b)
2
c)
3
d)
6
11.
How many nitrogen atoms are in
Fe(NO3)2
Fe(NO3)2
a)
1
b)
2
c)
3
d)
6
12.
How many oxygen atoms are in
Fe(NO3)2
Fe(NO3)2
a)
1
b)
2
c)
3
d)
6
13.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
14.
How many Hydrogen (H) atoms are in NH3O5
a)
3
b)
4
c)
5
d)
1
15.
Name the part in red:
H2 + O2 -> H2O
H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
16.
Name the part in red:
H2 + O2 -> H2O
H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
17.
Name the part in red:
H2 + O2 -> H2O
H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
18.
Is the following equation balanced or unbalanced ?
Al + O2 --> Al2O3
Al + O2 --> Al2O3
a)
Balanced
b)
Unbalanced
19.
How many hydrogens are in 4H2O?
a)
6
b)
8
c)
2
d)
4
20.
Read the following chemical formula: C6H12O6. How many hydrogen atoms are in the formula?
a)
12
b)
6
c)
4
21.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
22.
What are the coefficient used to balance the equation below?
__Ag2O →__ Ag +___O2
__Ag2O →__ Ag +___O2
a)
2,4,1
b)
1,1,1
c)
2,1,2
d)
2,2,2
23.
How many Oxygen atoms are in 4H2O?
a)
4
b)
1
c)
0
d)
8
24.
Evidence of a chemical reaction include:
a)
Phase change
b)
No new substance
c)
Bubbles forming
d)
Shape change
25.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO
N2+O2--> _NO
a)
1
b)
2
c)
3
d)
4
26.
Is this balanced?...
Fe + S --> FeS
Fe + S --> FeS
a)
YES!
b)
NO!
27.
What is the left part of a chemical equation called...
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
28.
What is the right part of a chemical equation called...
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
29.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
30.
How many aluminum atoms are in Al2(SO4)3?
a)
1
b)
2
c)
3
d)
4
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