lesson 2

when ice gains thermal energy, the kinetic energy .....................

• decreases

• remains constant

• increases

• doubled

When particles of substances gain more thermal energy, attraction force between molecules ..............................

• increases ( becomes stronger )

• isn't affected

• decreases ( becomes weaker )

Melting point of ice is .......

• 0C

• 100 C

• Less than 0

• more than 100

•When a liquid substance continues to gain thermal energy, its temperature gradually rises until it reaches the boiling point.

• first statement is true , 2nd statement is false

• Both statements are true

• Both statement are wrong

• first statement is false, second statement is true.

The increase in particle energy leads to a rise in temperature for both ice and water as in ....................... and ..................... processes.

• melting and freezing

• melting and evaporation

• freezing and condensation

• condensation and melting

water starts to boil at ....................

• 100 C

• 0 C

• 150 C

• Less than 100 C

As the temperature of a gas increases, the average kinetic energy of its particles ..........................

• becomes zero

• increases

• remains constant

• decreases

What happens to the temperature of water as it freezes?

• It fluctuates

• It increases

• It remains constant

• It decreases

During the process of condensation, the energy of the particles ..........................

• is converted to kinetic energy

• remains constant

• decreases

• increases