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WorksheetsIntroduction to Chemical Reaction Basic
Total questions: 26
Worksheet time: 30mins
Name
Class
Date
1.
An example of a chemical property is reactivity. This is
a)
a measure of how easily a substance combines with other substances to produce a new substance
b)
the danger to your health caused when a poisonous substance combines with chemicals in your body
c)
an indicator of how easily a substance catches fire. This creates a new substance
2.
A group of atoms bonded together.
a)
A Molecule
b)
The Coefficient
c)
The Subscript
d)
An Atom Party
3.
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
4.
How many molecules are in this chemical formula?
a)
4 Molecules
b)
6 Molecules
c)
2 Molecules
d)
5 Molecules
5.
How many oxygen atoms are in this chemical formula?
a)
6 oxygen atoms
b)
2 oxygen atoms
c)
3 oxygen atoms
d)
4 oxygen atoms
6.
The one or two letters used to represent elements
a)
Yield sign
b)
Coefficient
c)
Symbol
d)
Subscript
7.
Element or compound?
H2O
H2O
a)
element
b)
compound
8.
Element or compound?
O2
O2
a)
Element
b)
Compound
9.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
10.
A physical change is?
a)
It changes the object into something different
b)
Objects or substances undergo a change that does not change their chemical composition
c)
it is just like a chemical reaction
d)
Paper burning
11.
A chemical change is?
a)
a shoe lace cut in half
b)
doesn't change anything
c)
changes the look of an object
d)
change that results in the formation of new chemical substances
12.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
13.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
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.
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.
16.
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
17.
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
18.
Is this balanced?
2HgO → 2Hg + O2
2HgO → 2Hg + O2
a)
Yes
b)
No
19.
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
20.
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
21.
Which of the following IS a physical change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
22.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
23.
A candle is lite and placed placed under a jar. The candle will
a)
stay alight as is uses up the carbon dioxide and makes oxygen
b)
goes out as it uses up the oxygen and releases carbon dioxide.
c)
Will pop as the Hydrogen gas in the jar will burn
d)
goes out as the air in the jar is used up
24.
Eating chocolate on a hot day can be difficult.
a)
The chocolate will evaporate and become a liquid
b)
The hot air causes the chocolate to chemically react to form something sour.
c)
Energy is transferred from the hot air surrounding the chocalate causes it to melt.
25.
You can tell a new substance is formed when all but one of the below happens
a)
an odour is detected
b)
bubbles appear
c)
Light is emitted from a flame
d)
solid dry ice turns to a gas
26.
To produce Hydrogen you would need to have ...
a)
a metal such as zinc and a carbonate such as limetstone
b)
an acid such as hydrochloric acid plus a carbonate
c)
an metal such as magnesium plus an acid such as hydrochloric acid
d)
a balloon that you light
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