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Worksheets7~ Chemical Changes
Total questions: 10
Worksheet time: 15mins
Name
Class
Date
1.
A chemical change is different than a physical change because in a chemical change
a)
Chemicals are used
b)
Molecules do not physically touch
c)
A new substance is formed and in a physical change no new substance is formed
d)
The change can be seen but in a physical change it cannot
2.
In a chemical reaction
a)
The atoms of the reactants always stay together to form the products
b)
The atoms of the reactants unbond, rearrange, and then rebond to form the products
c)
Completely new atoms are formed which combine to make the products
d)
Some atoms disappear while others multiply to form the products
3.
In a chemical reaction, mass is conserved. This means that
a)
The mass of the reactants stays the same during a chemical reaction
b)
The mass of the products stays the same during a chemical reaction
c)
The type and number of atoms in the reactants equals the type and number of atoms in the products
d)
The mass of the products is always twice the mass of the reactants
4.
If the reactants on the left side of a chemical equation are C3H8 + 5O2, the products in a balanced equation could be
a)
4CO2 + 3H2O
b)
3CO2 + 4H2O
c)
2CO2 + 3H2O
d)
3CO + 4H2O
5.
One clue of a chemical change is the formation of a precipitate. A precipitate is formed when
a)
Two liquids react and a gas is produced
b)
A solid dissolves in a liquid
c)
One liquid dissolves in another
d)
Two liquids react and a solid is formed
6.
The PH Scale
a)
tells you the acidity or basicity of a liquid
b)
tells you how much of a chemical reaction occurred
c)
describes the atoms of a physical change
7.
Which of the following about the PH Scale is true.
a)
Acids are from 0-7, Bases are from 7-14, and 0 is neutral
b)
Bases are from 0-7, Acids are from 7-14, and 7 is neutral
c)
Acids are from 0-7, Bases are from 7-14, and 7 is neutral
8.
True or false? Dissolving salt is a chemical reaction.
a)
True
b)
False
9.
How many carbon atoms are in this molecule?
3Na + 2HO₃
3Na + 2HO₃
a)
0
b)
1
c)
2
10.
How many oxygen atoms are in this molecule?
3Na + 2HO₃
3Na + 2HO₃
a)
2
b)
3
c)
5
d)
6
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