1
Q
Are changes of state physical or chemical changes
A
physical changes as they can be reversed
2
Q
why do solids expand as they are heated
A
as the particles vibrate more, they are pushed further apart. volume increases
3
Q
real life example of problems with solid expansion
A
railway tracks can buckle
4
Q
why is gas the only state of matter that can be compressed
A
only state of matter with space between the particles, when they are compressed, this space decreases
Physics Year 9 GCSE
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