Solids have these charactaristics -

• molecules can rotate and slip past each other

• definite shape and volume

• low energy

• tightly packed molecules that vibrate

The characteristics of liquids are -

• indefinite shape and definite volume

• definite shape and indefinite volume

• more energy than solids

• take the shape of their container

The characteristics of gases are -

• definite volume, indefinite shape

• indefinite shape and volume

• medium energy

• high energy

PHASE changes are where one state of matter goes to another state of matter.

They are represented on the graph by ____________ lines.

• vertical

• diagonal

• flat

• angled

During a phase change (the FLAT lines on the graph), what stays the SAME?

• temperature

• heat energy

Just as in our ice lab, when there was both a solid (ice) and a liquid (water), the temperature ___________ until all the ice had melted.

• increased

• stayed constant (same)

During an EXOthermic reaction heat, ​ (a)   energy, is (b)   the environment.

• released into
• absorbed from
• thermal
• conductive

In an ENDOthermic reaction, heat is ​ (a)   the environment.

• absorbed from
• released into

Organize these options into the right categories

Groups:

(a) ENDOthermic (aborbs thermal energy)

,

(b) EXOthermic (releases heat energy)

• melting

• condensing

• evaporating

• freezing