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WorksheetsConservation of Mass
Total questions: 20
Worksheet time: 17mins
Name
Class
Date
1.
Anything that has mass & takes up space
a)
gravity
b)
force
c)
matter
d)
volume
2.
Measure of the amount of matter
a)
mass
b)
volume
c)
weight
d)
density
3.
Smallest unit of an element
a)
compound
b)
atom
c)
molecule
d)
product
4.
Smallest unit of a compound
a)
atom
b)
density
c)
element
d)
molecule
5.
Substance that cannot be broken into simpler substances
a)
element
b)
molecule
c)
gram
d)
proton
6.
Substance made up of chemically combined elements
a)
atom
b)
element
c)
electron
d)
compound
7.
Number placed in front of a chemical formula
a)
product
b)
coefficient
c)
reactant
d)
subscript
8.
Number written below & to the right of a chemical symbol
a)
subscript
b)
reactant
c)
product
d)
coefficient
9.
Substances that form as the result of a chemical reaction
a)
products
b)
reactants
c)
coefficients
d)
subscripts
10.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
11.
How many oxygen atoms are in the products for the chemical reaction below?
4Fe + 3O2 → 2Fe2O3
a)
2
b)
3
c)
5
d)
6
12.
The Law of Conservation of Mass says that matter can neither be __________ or __________.
a)
created; destroyed
b)
recycled; renewed
c)
subtracted; added
d)
joined; separated
13.
How many atoms are in the products below?
4Fe +3O2 → 2Fe2O3
a)
7
b)
10
c)
17
d)
20
14.
According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?
a)
The wood disappears.
b)
It stays the same chemically.
c)
The atoms in the wood and oxygen rearrange and form smoke and ash.
d)
Nothing.
15.
A 55-gram egg is placed in a pot. After the egg is boiled, which is most likely the mass of the egg?
a)
50
b)
55
16.
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
17.
Is this equation balanced or unbalanced?
H2 + O2 --> H2O
H2 + O2 --> H2O
a)
balanced
b)
unbalanced
18.
When sodium and chlorine combine to form sodium chloride, sodium chloride is the:
a)
Originator
b)
Reactant
c)
Product
d)
Produce
19.
Jason poured 500 grams of water into a container and tightly sealed it. The water was allowed to freeze. Which is most likely true about the ice that formed?
a)
The mass of the ice is the same as the mass of the water.
b)
The mass of the ice is greater than the mass of the water.
c)
The ice formed is a different substance than the water.
d)
The ice formed is the same temperature as the water.
20.
Anthony is performing an experiment. He adds 0.25 grams of baking soda to 5 grams of water and stirs. Anthony watches as the baking soda dissolves in the water. If Anthony weighs the water and baking soda solution, what will its mass be?
a)
4.75 grams
b)
5.0 grams
c)
5.25 grams
d)
7.5 grams
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