WorksheetsChemical Reactions Review
Total questions: 32
Worksheet time: 29mins
Name
Class
Date
1.
What is a reactant?
a)
what is produced from a chemical reaction
b)
the substances in a chemical reaction.
c)
what you use to find the arrow
2.
(reactants ----> products)
is how you would write the eqution?
is how you would write the eqution?
a)
true
b)
false
3.
Do all reactions have to follow the Law of conservation of Mass
a)
yes, they do have to follow it
b)
no, they dont have to follow it
4.
You are allowed to change the subscripts to balance the equation
a)
false
b)
true
5.
What is the Law of conservation of Mass
a)
mass cant be created or destroyed in a chemical reaction
b)
you must add all the masses together
c)
you must multiply the masses together
6.
The yield symbol is....
a)
:
b)
---->
c)
#
d)
+
7.
Reactions that give out heat to the surrounding are classified as one of the following:
a)
Spontaneous
b)
Sluggish
c)
Exothermic
d)
Endothermic
8.
To slow down a chemical reaction you will do one of the following:
a)
Place the reactants in hot water
b)
Place the products in ice bath
c)
Place the reactants in a ice bath
d)
Keep stirring the reactants with a stirring rod
9.
What is concentration?
a)
Refers to the number of reactants in a given volume
b)
Refers to the number of particles in a given volume
c)
Refers to the number of factors in a given volume
10.
particles that move faster because of temperature are
a)
not likely to react
b)
likely to react
c)
not likely to react and collide
d)
likely to react and collide
11.
Rate of chemical reaction means
a)
amount of product formed
b)
speed of reaction
c)
concentration of reacting particles
d)
combining reactants with products
12.
How many hydrogen atoms are in this chemical formula:
a)
4 hydrogen atoms
b)
1 hydrogen atom
c)
2 hydrogen atoms
d)
3 hydrogen atoms
13.
This is used to represent the number of each atom being represented.
a)
A Exponent
b)
The Coefficient
c)
A Molecule
d)
The Subscript
14.
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
15.
Is this balanced?
2HgO → 2Hg + O2
2HgO → 2Hg + O2
a)
Yes
b)
No
16.
4Si + S8 --> 2Si2S4
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Double displacement
17.
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)
Single diplacement
d)
Double displacement
18.
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Combustion
19.
Which chemical reaction switches 2 elements?
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
20.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
21.
Surface Area of reactants Increase
a)
Reactions go faster
b)
Reactions go slower
22.
Temperature of reactants Increase
a)
Faster
b)
Slower
23.
This picture is an example of burning a hydrocarbon which is what type of reaction?
a)
Combustion
b)
Single Relplacement
c)
Double Replacement
d)
Decomposition
24.
What are the coefficients if the following equation is properly balanced? Al + O2 → Al2O3
a)
4:3:2
b)
2:3:2
c)
2:1:1
d)
8:6:4
25.
Which of the following is NOT an indication of a chemical reaction?
a)
Formation of a precipitate
b)
Formation of a gas (bubbling)
c)
Heat is given off
d)
Mixing two chemicals together
26.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
27.
Why does a higher temperature increase the rate of a reaction?
a)
it increases both the frequency and energy of particle collisions
b)
it only increases the frequency of particle collisions
c)
it only increases the energy of particle collisions
d)
it reduces the activation energy of the reaction
28.
A ______________ is a substance that increases the rate of a reaction without being used up during the reaction.
a)
catalyst
b)
product
c)
reactant
d)
solute
29.
What is the name given to a catalyst in the human body?
a)
Biology
b)
Catalyst
c)
Chemical
d)
Enzyme
30.
More collisions correspond to a:
a)
Faster reaction rate
b)
Slower reaction rate
c)
Constant reaction rate
31.
When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?
a)
Endothermic
b)
Decomposition
c)
Exothermic
d)
Indothermic
32.
Temperature is...
a)
A measure of the potential energy stored in a substance
b)
The same as heat
c)
A measure of the random motions of the components of a substance
100 %
