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WorksheetsChemical Reactions and Review 35 ques
Total questions: 35
Worksheet time: 1hrs 12mins
Name
Class
Date
1.
This variable in an experiment is the one being deliberately changed by the scientist.
a)
dependent variable
b)
independent variable
c)
data
d)
control group
2.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction.
3.
What is the little number after an element in a chemical equation called?
Example: H2
Example: H2
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
4.
Balance this equation:
Fe + S → FeS
Fe + S → FeS
a)
Fe + 2S → FeS2
b)
2Fe + S → 2FeS
c)
3Fe + 2S → 3FeS
d)
It's already balanced.
5.
Is this balanced?
2HgO → 2Hg + O2
2HgO → 2Hg + O2
a)
Yes
b)
No
6.
Is this balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
7.
In the equation,
2Mg + O2 → 2MgO,
which are the reactants?
2Mg + O2 → 2MgO,
which are the reactants?
a)
Mg and O2
b)
MgO
c)
Mg and MgO
d)
O2 and MgO
8.
At the end of a chemical reaction, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is double the mass
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
9.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
c)
The total number of atoms in a reaction
10.
Balance the problem: N2 + O2 → NO
a)
N2 + O2 → 2NO
b)
2N2 + O2 → 2NO
11.
Which of the following correctly balances this equation?
_H2+_Cl2 → _HCl
_H2+_Cl2 → _HCl
a)
2H2 + Cl2 → 4HCl
b)
H2+Cl2 → 2HCl
c)
3H2 + 3Cl2 → HCl
d)
H + Cl → HCl
12.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
60
13.
What is the name of this chemical formula?
H2O
H2O
a)
Water
b)
Dihydrogen Monoxide
c)
Monohydrogen Dioxide
14.
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.
15.
When materials combine to form new compounds it is a chemical change. Which example is a chemical change?
a)
baking powder fizzing
b)
water boiling
c)
ice melting
d)
sugar cube dissolving
16.
Which is an example of a chemical reaction?
a)
paper cut into small pieces
b)
chocolate melting in a pan
c)
flour and sugar mixed in a bowl
d)
cookies baking in an oven
17.
Coefficients tell us how many ________ there are of an element in a compound.
a)
Elements
b)
Atoms
c)
Molecules
18.
How many ELEMENTS are in the compound H2O
a)
1
b)
2
c)
3
d)
4
19.
How many ELEMENTS are in the compound O2
a)
1
b)
2
c)
3
d)
4
20.
How many ATOMS of Carbon are in 3C2H4O
a)
2
b)
3
c)
4
d)
6
21.
How many ATOMS of Oxygen are in 3Fe2O3
a)
2
b)
3
c)
6
d)
9
22.
How many TOTAL atoms are in 2CaO2
a)
2
b)
3
c)
5
d)
6
23.
What is the name of the following element?
Na
Na
a)
Sodium
b)
Sulfur
c)
Potassium
d)
Zinc
24.
The products of respiration are
a)
carbon dioxide and water
b)
glucose and oxygen
c)
methane and oxygen
d)
iron oxide
25.
carbon dioxide reacts with water in the presence of sunlight to form glucose and oxygen
a)
combustion
b)
photosynthesis
c)
respiration
d)
rust
26.
The chemical formula for glucose is
a)
CH4
b)
C6H12O6
c)
CO2
d)
H2O
27.
The chemical formula for methane is
a)
CH4
b)
C6H12O6
c)
CO2
d)
Fe2O
28.
_________________ are the elements and compounds that enter into a chemical reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
29.
You know you 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.
30.
The atom is made of three distinct parts. They are
a)
quarks, positrons, electrons
b)
neutrons, positrons, ions
c)
protons, neutrons, electrons
d)
solids, liquids, gases
31.
Which of these is a compound?
a)
Copper
b)
Carbon Dioxide
c)
Sodium
d)
Zinc
32.
Which of these is an element?
a)
Carbon
b)
Water
c)
Salt
d)
Sugar
33.
A candle wick burning is an example of a _________________________
a)
physical reaction
b)
condensation
c)
neutrons
d)
chemical reaction
34.
_____________________ is a chemical reaction in plants to produce glucose (sugar).
a)
Photosynthesis
b)
Decomposition
c)
Foliage
d)
Respiration
35.
The smell your dog makes after eating to much people food is caused by
a)
Chemical Change
b)
Physical Change
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