1. Which unit is used to measure mass? Test yourself
2. Which is heavier, a kilogram of iron or a kilogram of feathers?
Explain your answer.
3. Make a table with the headings 'Gases, 'Liquids' and 'Solids' to
compare the arrangement of particles and their behaviour within
these three states of matter.
4. Railway lines are made of steel, which expands and contracts when
the temperature changes. Draw a diagram and use the particle
model of matter to explain what happens to the railway tracks
when the temperature increases and decreases.
5. You burn some toast in the kitchen. A minute later
calls out from the bedroom 'What is burning?'Use the particle
your
friend
model of matter, with diagrams, to explain how your friend knew
something was burning even though they could not see it and
did not hear you.
If there are five people in a shop and then 10 more people come
in, has the store become more or less dense with people?
Identify two factors that affect density.​