Water and Changes of State

Water exists in three states: solid, liquid & gas,

• False

• True

When ice ​ (a)   and melts, it changes state from ​ (b)   to ​ (c)   .

• gains heat
• loses heat
• solid
• liquid
• gas

Which of these processes involves HEAT LOSS?

• Condensation

• Melting

• Freezing

• Boiling

• Evaporation

Which of these processes involves HEAT GAIN?

• Condensation

• Melting

• Freezing

• Boiling

• Evaporation

Evaporation occurs at ​ (a)   while boiling occurs at ​ (b)   .

• any temperature
• 0°C

The melting and freezing point of pure water is ​ (a)   °C while the boiling point of water is ​ (b)   °C.

• 0
• 100
• 25
• 37

Water in its gaseous state (steam) can be seen.

• True

• False

When steam is cooled by the surrounding air, it condenses into water droplets (liquid).
This forms the "white clouds" that we are able to see.

• False

• True

In which process(es) does/do water change state from liquid to gas?

• Freezing

• Boiling

• Evaporation

• Condensation

Impurities like salt ​lowers the melting point of pure water, allowing it to remain ​ (a)   below 0°C.

• liquid
• solid
• gas