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WorksheetsTCAP Review: Law of Conservation of Mass (9.11)
Total questions: 19
Worksheet time: 57mins
Name
Class
Date
1.
According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
a)
There is no relationship.
b)
The mass of products is sometimes greater.
c)
The mass of reactants is greater.
d)
The masses are always equal.
2.
Which chemical equation is balanced?
a)
Na + O2 --> Na2O
b)
2Na2 + O2 --> 2Na2O
c)
2Na + 2O2 --> 2Na2O
d)
2Na + O2 --> 2Na2O
3.
Which of these formulas contain equal numbers of nitrogen atoms?
a)
Formulas I and III
b)
Formulas I and IV
c)
Formulas II and III
d)
Formulas I, II, and V
4.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
5.
All of the following reactions are correctly balanced except-
a)
A
b)
B
c)
C
d)
D
6.
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
7.
The number placed below an element's symbol in a chemical formula is called a
a)
subscript
b)
coefficient
c)
reactant
d)
product
8.
The coefficient in 3H2O is
a)
6
b)
2
c)
3
d)
5
9.
In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?
a)
4g
b)
5g
c)
9g
d)
14g
10.
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
11.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same number of atoms
c)
Same subscripts
d)
Same coefficients
12.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
13.
12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed?
a)
28 g
b)
4g
c)
30g
d)
12g
14.
How many Sulfur atoms are in this compound?
Al2(SO4)3
Al2(SO4)3
a)
4
b)
2
c)
3
d)
1
15.
How many Calcium atoms are in this compound?
Ca (OH)2
Ca (OH)2
a)
2
b)
3
c)
1
d)
4
16.
Is this equation balanced or unbalanced?
CH4 + 2O2--> CO2+ 2H2O
a)
balanced
b)
unbalanced
17.
Is this equation balanced or unbalanced?
H2 + O2 --> H2O
H2 + O2 --> H2O
a)
balanced
b)
unbalanced
18.
Which equation best represents the law of conservation of mass?
a)
A
b)
B
c)
C
d)
D
19.
Is this equation balanced or unbalanced?
2Fe2O3 + 3C --> 4Fe + 3 CO2
2Fe2O3 + 3C --> 4Fe + 3 CO2
a)
balanced
b)
unbalanced
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