Changes of State Recap
1. Fill in the gaps using the word bank.
vibrate
solid
a) In
a
flow
far apart
touching
____________,
the
gas
arrangement
compress
particles
are
slide
closely
packed
liquid
spaces
together
in
a
fixed
__________________ and can only _______________ in place.
b) In a ____________, the particles are still ________________ but can _____________ past
each other, which allows this state of matter to ____________.
c) In a ____________, the particles are very _________ _____________ from each other, and
there are large ________________ between them. This is why gases are easy to
______________________.
2. It’s a hot summer day, and you just bought your
favourite ice cream cone. But oh no! You dropped it
on the pavement, and now you have to figure out
what’s happening to your ice cream as it changes
state.
a) Your ice cream starts to drip and turn into a liquid.
What is this change of state called? [1]
___________________________________________________________________________
b) Explain what happens to the particles in the ice cream as it melts. [2]
Include these ideas in your answer:
 the energy and movement of the
particles.
 what happens to the positions of the
particles.
Include these key words in your answer:
 energy
 vibrate
 fixed position
 slide
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
Changes of State Recap
1. Fill in the gaps using the word bank.
vibrate
solid
a) In
a
flow
far apart
touching
____________,
the
gas
arrangement
compress
particles
are
slide
closely
packed
liquid
spaces
together
in
a
fixed
__________________ and can only _______________ in place.
b) In a ____________, the particles are still ________________ but can _____________ past
each other, which allows this state of matter to ____________.
c) In a ____________, the particles are very _________ _____________ from each other, and
there are large ________________ between them. This is why gases are easy to
______________________.
2. It’s a hot summer day, and you just bought your
favourite ice cream cone. But oh no! You dropped it
on the pavement, and now you have to figure out
what’s happening to your ice cream as it changes
state.
a) Your ice cream starts to drip and turn into a liquid.
What is this change of state called? [1]
___________________________________________________________________________
b) Explain what happens to the particles in the ice cream as it melts. [2]
Include these ideas in your answer:
 the energy and movement of the
particles.
 what happens to the positions of the
particles.
Include these key words in your answer:
 energy
 vibrate
 fixed position
 slide
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
c) You decide to save some of your melted ice cream by putting it back in
the freezer. What is the change of state when the liquid ice cream
turns back into a solid? [1]
________________________________________________________
d) Draw and label a "before and after" particle diagram to show what
happens to the particles during this process. [2]
e) After some time, the puddle of melted ice cream on the ground starts to disappear. What
process is causing the liquid to turn into a gas? [1]
___________________________________________________________________________
f) Your ice cream cone mixed with dirt. Is this a reversible or irreversible
change? Why? [2]
_______________________________________________________
_______________________________________________________
_______________________________________________________
c) You decide to save some of your melted ice cream by putting it back in
the freezer. What is the change of state when the liquid ice cream
turns back into a solid? [1]
________________________________________________________
d) Draw and label a "before and after" particle diagram to show what
happens to the particles during this process. [2]
e) After some time, the puddle of melted ice cream on the ground starts to disappear. What
process is causing the liquid to turn into a gas? [1]
___________________________________________________________________________
f) Your ice cream cone mixed with dirt. Is this a reversible or irreversible
change? Why? [2]
_______________________________________________________
_______________________________________________________
_______________________________________________________