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WorksheetsChemical Reactions
Total questions: 14
Worksheet time: 14mins
Name
Class
Date
1.
What kind of change is cutting paper?
a)
b)
2.
What kind of change is frying an egg?
a)
b)
3.
What kind of change is burning wood?
a)
b)
4.
What kind of change is a melting popsicle?
a)
b)
5.
Measure of the amount of matter
a)
mass
b)
volume
c)
weight
d)
density
6.
Smallest unit of an element
a)
compound
b)
atom
c)
molecule
d)
product
7.
Which of these is not a chemical reaction?
a)
Burning of wood
b)
Milk going bad
c)
Mixing vinegar and baking soda
d)
Melting of ice
8.
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
9.
How many oxygen atoms are in the products for the chemical reaction below?
4Fe + 3O2 → 2Fe2O3
a)
2
b)
3
c)
5
d)
6
10.
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
11.
How many atoms are in the products below?
4Fe +3O2 → 2Fe2O3
a)
7
b)
10
c)
17
d)
20
12.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
13.
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
14.
Is this equation balanced or unbalanced?
H2 + O2 --> H2O
H2 + O2 --> H2O
a)
balanced
b)
unbalanced
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