1. a Classify the following substances as solids , liquids or gases at 20 °c.
Put your answers into a suitable table.
Orange juice; hydrogen; helium;
Granite; seawater; steel
Sulfur dioxide; polythene; diesel
b. Name two materials that would be difficult to classify as a solid, liquid, or a gas.
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2. Copy and compete the table below to describe the differences between solids, liquids and gases
Does it have its own
fixed shape?
solid
Liquid
Gas
Is it easy to compress?
Does it spread out or
Flow easily?
3. Copy and compete the sentences using, words from the following list:
Vibrate pressure around walls.
Quickly
gas space Solid
The particles in a…………………………………………… are fixed in position but they do ……………………………………..
In a liquid , the particles can move …………………………………………………. Slipping and sliding over each other.
In a ……………………………………………..,the particles move very …………………………………………… and there is a
lot of …………………………………………. Between particles. As they collide with the ………………………………… of
their container they produce a force that causes gas……………………………..
4. the arrows represent changes of state:
D
Box A
Box B
F
G
E
a) Which box contains:
I.
A solid?
II.
…………………………………………………….
A liquid?
III.
……………………………………………………..
A gas?
……………………………………………………
box C
b) Which state of matter is most easily compressed?
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c) Identify the changes of state labelled
D …………………………………………
E………………………………………….
F………………………………………….
G………………………………………..
d) Michael want to see how easily sulfur powder melts.
Sulfur burns in air to form toxic sulphur dioxide gas.
Give two safety precautions that Michael should take in her experiment.
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6. What do you think happens to their to the vibrations of the particles when you heat a solid?
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7. Use the particle theory to explain why liquids can be poured
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8. Use the particle theory to explain why it is easy to move through a gas.
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9. Copy and complete these sentences using the particle theory
a) Solids have a fixed shape because.
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…....................................................................................................................................................................
b) Liquids have no fixed because.
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c) Gases take a large volume because.
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10. Define the following words.
a) Condensing
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b) Melting
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c) Boiling
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f) Freezing
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