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WorksheetsQ2LC2: Reactions Review
Total questions: 20
Worksheet time: 28mins
Name
Class
Date
1.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
2.
Balance this equation-
__P4 + __O2 --> __P2O3
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
3.
The law of conservation of mass states that....
a)
Matter can be made
b)
Matter can be destroyed
c)
Matter can neither be made or destroyed
4.
When balancing equations what does the arrow symbol ("→") stand for?
a)
subscript
b)
equals
c)
it is just an arrow
d)
yield
5.
Which of the following is evidence of a chemical reaction?
a)
fizzing
b)
water changing to ice
c)
saltwater
d)
paper being cut in half
6.
Which of the following symbols is not a correct indication of the phase of a substance in a reaction?
a)
(s)=solid
b)
(g)=grams
c)
(l)=liquid
d)
(aq)= aqueous
7.
This appears on the left side of a chemical formula, and represents how many molecules there are.
a)
An Atom
b)
The Subscript
c)
A Molecule
d)
The Coefficient
8.
How many oxygen atoms are in this chemical formula?
a)
7 oxygen atoms
b)
4 oxygen atoms
c)
3 oxygen atoms
d)
1 oxygen atoms
9.
How many molecules are in this chemical formula?
a)
5 molecules
b)
4 molecules
c)
2 molecules
d)
6 molecules
10.
What are the reactants in the following chemical equation?
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
H2
b)
O2
c)
2H2 + O2
d)
2H2O
11.
__Na3PO4+__KOH v→ __NaOH + __ K3PO4
a)
1, 3, 3,1
b)
2, 2, 3,1
c)
1, 2, 2,1
d)
3, 3, 3,1
12.
What type of chemical reaction is the equation below?
2Fe + 6NaBr → 2FeBr3 + 6Na
2Fe + 6NaBr → 2FeBr3 + 6Na
a)
single replacement
b)
double replacement
c)
synthesis
d)
decomposition
13.
Combustion reactions take with which element as a reactant in order to produce water and carbon dioxide?
a)
oxygen
b)
carbon
c)
nitrogen
d)
hydrogen
14.
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.
15.
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
16.
Identify the type of reaction:
Ca + O --> CaO
Ca + O --> CaO
a)
Decomposition
b)
Synthesis
c)
Double Replacement
d)
Combustion
17.
Which chemical reaction breaks down into 2 substances?
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
18.
PbCl2 + AgNO3 ---> Pb(NO3)2 + AgCl
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
19.
What is the left part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
20.
What is the right part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
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