WorksheetsConservation of Mass and Balancing Equations
Total questions: 20
Worksheet time: 13mins
Name
Class
Date
1.
The number in front of a compound or element is a
a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
2.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
3.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
4.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
5.
Evidence of a chemical reaction include:
a)
Phase change
b)
No new substance
c)
Bubbles forming
d)
Shape change
6.
Anything that has mass & takes up space
a)
gravity
b)
force
c)
matter
d)
volume
7.
Substance that cannot be broken into simpler substances
a)
element
b)
molecule
c)
gram
d)
proton
8.
Substance made up of chemically combined elements
a)
atom
b)
element
c)
electron
d)
compound
9.
Number written below & to the right of a chemical symbol
a)
subscript
b)
reactant
c)
product
d)
coefficient
10.
Substances that form as the result of a chemical reaction
a)
products
b)
reactants
c)
coefficients
d)
subscripts
11.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
12.
Electrons in the outermost orbit or shell
a)
quarks
b)
molecules
c)
valence
d)
compounds
13.
How many iron atoms are in
Fe(NO3)2
Fe(NO3)2
a)
1
b)
2
c)
3
d)
6
14.
Highly reactive metals in first column of periodic table
a)
halogens
b)
noble gases
c)
alkali metals
d)
metalloids
15.
Highly reactive non-metals in second to last column on periodic table
a)
noble gases
b)
metalloids
c)
alkali metals
d)
halogens
16.
Is this chemical equation balanced?
2Na + Cl2 ----> 2NaCl
2Na + Cl2 ----> 2NaCl
a)
Yes
b)
No
17.
The total amount of matter (atoms) before and after a chemical reaction remains the same.
a)
True
b)
False
18.
Which are the reactants in the following reaction?
2Mg + O2 ---> 2MgO
2Mg + O2 ---> 2MgO
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
19.
Balance this equation:
MgCl2 --> Mg4+ Cl2
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
20.
Mg + ___ HCl → MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
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