WorksheetsTopic 3 Chemical Reactions
Total questions: 25
Worksheet time: 1hrs 5mins
Name
Class
Date
1.
What do you call people who are afraid of Santa Claus?
a)
Claus-trophobic
b)
Elfobia
2.
What are Chemical Reactions?
a)
It's when you mix substances.
b)
a process in which atoms rearrange to form new substances
c)
When something bubbles.
d)
letter and numbers showing the types and number of atoms
3.
Which of the following is NOT evidence that that a chemical reaction has occurred?
a)
produces light/heat
b)
production of a gas
c)
formation of a precipitate
d)
melting
4.
A different chemical substance is formed when _____.
a)
water boils
b)
metal rusts
c)
ice melts
d)
rock is crushed
5.
A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?
a)
cutting a piece of paper
b)
folding a piece of paper
c)
tearing a piece of paper
d)
burning a piece of paper
6.
In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.
a)
reactants
b)
products
c)
neutrals
d)
energizers
7.
If you combine two substances in a beaker at room temperature and the beaker feels cold to the touch, it means that the substances:
a)
have not reacted with each other
b)
have undergone an endothermic reaction
c)
have undergone a physical change
d)
have undergone an exothermic reaction
8.
In any chemical reaction, the mass of the products is always:
a)
slightly less than the mass of the reactants
b)
much less than the mass of the reactants
c)
the same as the mass of the reactants
d)
greater than the mass of the reactants
9.
The large number in front of a chemical formula or compound is the ___________.
a)
coefficient
b)
product
c)
physical
d)
chemical
10.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
Fe + S --> FeS
a)
balanced
b)
unbalanced
11.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
12.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
13.
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
14.
Which problem is balanced?
(Check ALL answers)
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
15.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
16.
Is this balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
17.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
18.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
19.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
20.
A common synthetic material that is found almost everywhere is ________.
a)
Coal
b)
Lumber
c)
Plastic
d)
Aerogel
21.
_______ is an example of a synthetic fabric.
a)
Wool
b)
Silk
c)
Cotton
d)
Nylon
22.
Materials made by humans through chemically changing natural resources are called?
a)
Nonrenewable Resources
b)
Synthetic Materials
c)
Renewable Resources
23.
Synthetic Materials tend to be ___________________ than Natural materials.
a)
less durable
b)
more durable
c)
just as durable
24.
The formation of a solid when two liquids combine is called?
a)
Solidification
b)
Freezing
c)
Precipitate
d)
Solubility
25.
How many atoms are in C6H12O6?
a)
1
b)
3
c)
24
d)
32
100 %
