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Worksheets7H - Atoms, Elements and Molecules
Total questions: 20
Worksheet time: 15mins
Name
Class
Date
1.
What happens in all chemical changes?
a)
A gas is produced.
b)
Heat energy is given out.
c)
Elements change into a compound.
d)
One or more new substances are formed.
2.
A compound contains:
a)
only one type of atom.
b)
only one element.
c)
only two elements joined together.
d)
at least two elements joined together.
3.
Which of the following particle diagrams show molecules of a mixture of elements?
a)
A
b)
B
c)
C
d)
D
4.
The particle diagram above shows:
a)
an element.
b)
a compound.
c)
a mixture of elements.
d)
a mixture of compounds.
5.
Which of the following lists contains only elements?
a)
air, iron, iodine, magnesium
b)
zinc, gold, aluminium, oxygen
c)
nitrogen, copper, mercury, water
d)
chlorine, argon, sodium, limestone
6.
The correct way to write the chemical symbol for the element calcium is:
a)
ca
b)
CA
c)
Ca
d)
cA
7.
Which of these elements is used to build bridges?
a)
Iron
b)
Gold
c)
Oxygen
d)
Carbon
8.
We need to recycle some of our metals more because recycled metals …
a)
have better properties.
b)
do not corrode as easily.
c)
produce more carbon dioxide.
d)
save our limited natural resources.
9.
Which list contains only non-metal elements?
a)
oxygen, nitrogen, argon, silicon
b)
chlorine, oxygen, sulfur, iron
c)
bromine, helium, carbon, air
d)
gold, silver, platinum, mercury
10.
Which list contains only typical properties of metals?
a)
good conductor of heat, brittle, low melting point
b)
poor conductor of heat, strong, high melting point
c)
good conductor of electricity, strong, high melting point
d)
poor conductor of electricity, weak, low melting point
11.
Metals like aluminium are used to make cooking pots because they are …
a)
brittle and good conductors of heat.
b)
malleable and good conductors of heat.
c)
brittle and poor conductors of heat.
d)
malleable and poor conductors of heat.
12.
All metals are …
a)
solids.
b)
strong.
c)
brittle and easily broken.
d)
conductors of electricity.
13.
Which of the following shows the particles in a mixture of compounds?
a)
A
b)
B
c)
C
d)
D
14.
When iron and sulfur react they form:
a)
a new element.
b)
a mixture of elements.
c)
a new compound.
d)
a mixture of compounds.
15.
The reaction between calcium and oxygen forms:
a)
calcium oxate.
b)
calcium oxide.
c)
calcium oxygen.
d)
calcium carbonate.
16.
When metals and non-metals form a compound, the compound will usually:
a)
be easily broken up.
b)
have the same properties as the elements.
c)
take up a larger volume than the elements.
d)
have different properties to the elements.
17.
The breakdown of a compound into simpler substances is called a thermal:
a)
filtration.
b)
precipitation.
c)
elementation.
d)
decomposition.
18.
When iron and sulfur are mixed and heated, what changes might you see to tell you a reaction has started?
a)
A gas is given off.
b)
A solid is formed.
c)
The mixture changes into a liquid.
d)
The mixture glows red.
19.
What is the missing substance in this equation? copper carbonate ? copper oxide + ???
a)
carbon
b)
water
c)
oxygen
d)
carbon dioxide
20.
To break down the compound silver oxide into its elements you would need to:
a)
heat it.
b)
dissolve it water.
c)
mix it with oxygen.
d)
change it into a new compound.
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