2.3 explaining changes of state

Question 1

what happens when solids are heated?

Answer 1

they expand

Question 2

when a solid is heated, what transfers to the particles in the solid?

Answer 2

heat energy

Question 3

what happens when attractive forces are not strong enough to hold solids in a fixed position?

Answer 3

the solid melts

Question 3

how do solids melt?

Answer 3

they melt when they are heated more strongly

Question 4

what happens when liquids are heated?

Answer 4

they evaporate and boil

Question 5

as heat energy is transferred to the particles, they _____ _____.

Answer 5

move more

Question 6

what happens when the attractive forces become weak?

Answer 6

the particles can get enough energy to break the weak forces holding them together, and can move freely

Question 7

what are gas particles like?

Answer 7

gas particles are spread far apart

Question 8

what happens when gas reaches a cold surface?

Answer 8

some heat energy from the particles transfers to the surface and the particles move less and get closer to form a liquid

Question 9

what happens when a liquid cools?

Answer 9

they gain less energy; the less energy particles have, the less they are able to move or slide past one another

Question 10

what happens when the particles of liquid have so little energy?

Answer 10

eventually the particles have so little energy that they cannot move or flow anymore because they turned to a solid and start to arrange in a fixed pattern