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Worksheets8th Chemical Formulas, Reactions, and Equations Test Review
Total questions: 27
Worksheet time: 32mins
Name
Class
Date
1.
what is a chemical reaction ?
a)
something fun
b)
a explotion
c)
a mixure that make a new substance
d)
none of them
2.
What coefficients are needed to correctly balance the equation?
_Bi + _O2 > _Bi2O3
_Bi + _O2 > _Bi2O3
a)
3,2,3
b)
2,3,2
c)
4,3,2
d)
none of these
3.
What must go in the blank space to balance the equation?
4Fe + ____O2 --> 2Fe2O3
a)
1
b)
2
c)
3
d)
4
4.
The right side of the equation below is called the
a)
products
b)
reactants
5.
The left side of the equation below is called
a)
Products
b)
Reactants
6.
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
a)
Coefficient
b)
reactant
c)
subscript
d)
product
7.
Which of the following is NOT a sign of a chemical reaction?
a)
Color changes
b)
Cutting into fourths
c)
Light is produced
d)
Gas is formed
8.
Which statement is not a description of a chemical reaction?
a)
A solid is dropped into a beaker of liquid and a gas is released.
b)
Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
c)
A solid is dropped into a beaker of liquid and an explosion occurs.
d)
A liquid is heated on a hot plate and its temperature rises.
9.
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
10.
Which of the following is not evidence of a chemical reaction?
a)
Formation of a precipitate
b)
Production of gas
c)
Change in temperature
d)
Change in state of matter
11.
A chemical reaction is...
a)
when a substance is mixed with another substance
b)
when a substance undergoes a change to form a new substance
c)
when a substance is dissolved into another substance
d)
when a substance is heated or exposed to another substance
12.
Mass cannot be ____ or _____.
a)
made, changed
b)
created, destroyed
c)
rearranged, unmade
d)
stagnant, unchanging
13.
A precipitate is...
a)
a solid that falls out of a liquid solution
b)
a reactant in a reaction
c)
a clear substance
d)
the mass of a product
14.
Which of the following is NOT an example of a chemical reaction?
a)
Wood Burning
b)
A cake baking in an oven
c)
Melting Ice Cream
d)
Mixing Vinegar and Baking Soda
15.
How many atoms of Carbon are in one molecule of table sugar (C12H22O11) ?
a)
12
b)
22
c)
11
d)
1
16.
What is the small number written after a chemical symbol called?
a)
Coefficient
b)
Subscript
c)
Product
d)
Reactant
17.
According to the law of conservation of mass...
a)
sometimes atoms are lost
b)
sometimes atoms are gained
c)
atoms are never lost nor gained
d)
atoms are lost and gained
18.
A compound is made up of
a)
one or more different atoms.
b)
one or more atoms.
c)
one or more mixtures.
d)
one or more solutions.
19.
You know a chemical reaction has occurred if
a)
there is a precipitate.
b)
there is a color change.
c)
there is a temperature change.
d)
All of these answers are evidence.
20.
What is H2SO4
made up of?
made up of?
a)
2 hydrogen, 1 sulfur, 4 oxygen
b)
1 hydrogen, 2 sulfur, 4 oxygen
c)
2 hydrogen & 4 sodium
d)
1 hydrogen & 6 sodium
21.
How many elements are represented in the compound?
Na2CO3
Na2CO3
a)
1
b)
2
c)
3
d)
4
22.
Two clear liquid chemicals are mixed and a solid substance forms, this is an example of what?
a)
Temperature change
b)
Precipitate
c)
Gas production
d)
Odor change
23.
Which type of change always produces a new substance?
a)
Physical change
b)
Chemical change
c)
Endothermic
d)
Scary
24.
Chopping a tree branch with an axe is an example of which type of change?
a)
Physical
b)
Chemical
c)
Endothermic
d)
Exothermic
25.
How many elements are represented in the compound?
Na2CO3
Na2CO3
a)
1
b)
2
c)
3
d)
4
26.
What is C3H8
(methane) made up of?
(methane) made up of?
a)
1 carbon & 1 hydrogen
b)
3 carbons & 8 hydrogens
c)
8 carbons & 3 hydrogen
d)
11 carbons & 11 hydrogen
27.
What is NaHCO3
(Baking Soda) made up of?
(Baking Soda) made up of?
a)
1 sodium, 1 hydrogen,
1 carbon, 3 oxygen
1 carbon, 3 oxygen
b)
1 sodium, 1 hydrogen, 3 cobalt
c)
1 nitrogen, 1 hydrogen, 3 cobalt
d)
1 nitrogen, 1 hydrogen, 3 cobalt
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