WorksheetsChemical Reactions
Total questions: 14
Worksheet time: 52mins
Name
Class
Date
1.
When chemicals react with each other to make new chemicals, it's called _____
a)
a physical reaction
b)
a chemical reaction
c)
a chemical equation
d)
rusting
2.
The chemical H2O is commonly known as _____
a)
vinegar
b)
salt
c)
sugar
d)
water
3.
Water is _____
a)
two parts O and one part H
b)
two parts H and one part O
c)
one part H and one part O
d)
two parts H and two parts O
4.
The H in H2O stands for _____
a)
hydrogen
b)
helium
c)
hafnium
d)
half-and-half
5.
The O in H2O stands for _____
a)
hydrogen
b)
oxygen
c)
okay
d)
only water
6.
What element in the air causes iron to rust?
a)
oxygen
b)
nitrogen
c)
hydrogen
d)
helium
7.
What tiny particles separate and recombine with elements during chemical reactions?
a)
protons
b)
electrons
c)
neutrons
d)
photons
8.
Car engines and motorcycle engines work by combining _____
a)
gasoline and oxygen
b)
gasoline and hydrogen
c)
gasoline and nitrogen
d)
hydrogen and oxygen
9.
Fire is a chemical reaction involving fuels, like paper and wood, with _____ in the air
a)
nitrogen
b)
hydrogen
c)
oxygen
d)
water vapour
10.
Which gas is found in some types of fire extinguishers?
a)
oxygen
b)
hydrogen
c)
nitrogen
d)
carbon dioxide
11.
Where was dynamite invented?
a)
Sweden
b)
England
c)
Austria
d)
the United States
12.
Everything is made of _____
a)
chemicals
b)
water
c)
air
d)
earth
13.
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.
14.
Jane shook, then opened a bottle of soda, and it fizzed over. Is this evidence of a chemical reaction?
a)
yes
b)
no
100 %
