Water and its changes of state revision quiz

What is the change of state observed when water freezes?

• solid to liquid

• liquid to gas

• liquid to solid

• gas to liquid

What is the process that causes water vapour to change to water?

• Melting

• Evaporation

• Condensation

• Boiling

Which of the following processes involve a heat gain?

• Melting

• Boiling

• Evaporation

• Condensation

• Freezing

Father heated a kettle of water in the kitchen. After 15 minutes, the water reached boiling point but he forgot to turn off the flame. What would the temperature of the water be at the 20th minute?

• 80°C

• 90°C

• 100°C

• 110°C

Maggie packed some hot soup into a container. Half an hour later, she observed water droplets forming on the container.

Which one of the diagrams correctly shows her observation?

• 1

• 2

• 3

• 4

Jane used a metal lid to cover a beaker of water at 50°C as shown in the diagram.

After some time, Jane noticed some water droplets were formed under the metal lid.

What could Jane do to increase the amount of water droplets formed under the metal lid?

• Lift the metal lid higher.

• Heat up the metal lid.

• Put the beaker of water over a flame.

• Add some ice cubes into the beaker of water.

In the kitchen, Ali heated a pot of ice cubes until it started to boil. Then he continued to let it boil for another 10 minutes.

Which one of the following graphs below shows the changes in the temperature of the pot of ice cubes correctly?

• 1

• 2

• 3

• 4

Peter took out two similar ice-cubes from the freezer and put them on two similar

plates. He crushed one of the ice-cubes. Then he placed both plates in an air-

conditioned room with a surrounding temperature of 10 °C. What would happen to the ice on the plates?

• Both the ice cube and the crushed ice will not melt.

• The ice cube will melt faster than the crushed ice.

• The crushed ice will melt faster than the ice cube.

• Both the ice cube and crushed ice will take the same amount of time to melt completely.

Refer to the diagram below carefully. A beaker of black and sweet coffee was heated over time. A cold surface was put above the beaker. What is the substance “X” formed on the cold surface?

• coffee powder

• coffee droplets

• sugar droplets

• water droplets

Study the picture carefully. While boiling water, Azman observed “white clouds” forming just above the spout of the kettle. What were these "white clouds"?

• steam

• smoke

• water droplets

• water vapour