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The change of water from one state to another during the water cycle helps us to obtain __________ water.
clean
Matter can exist in different states, such as ________, ________ and _________.
solid, liquid and gas
Water in the __________ state is called water vapour
gaseous
Water vapour that is formed when water boils is also called _________________.
steam
Ice ______ heat and turns to water. This process is __________________.
gains heat. Melting
Water ______heat and turns to hot water vapour. This process is ____________.
gains heat. Boiling.
When ice is melting, does the temperature increase, decrease or stay the same?
stay the same
Describe freezing
Freezing is the process where a substance changes from liquid state to solid state at a fixed temperature.
Where did the water droplets on the underside of a pot cover come from? The pot of water is boiling on the stove. Describe.
The steam from the boiling water rose and touched the cooler underside of the pot cover, lost heat and condensed to form water droplets.
W____, t______ and e_____ s_______ a_____ can affect how quickly evaporation takes place.
water, temperature and exposed surface area
______________ and ___________are 2 important processes that happen naturally on the Earth so that rain can occur.
Evaporation and Condensation
The melting point of X is 44 degrees Celsius and its boiling point is 280 degrees Celsius.
At which temperature would X have a fixed shape and volume?
A - 40 B - 90 C - 200 D - 300
A - 40 degrees Celsius
Explain why there are droplets of water at the outer surface of a can of coke.
The warm water vapour in the surrounding touched the cooler outer surface of the can, lost heat and condensed to form water droplets.
The boiling point of Y is 90 degrees Celsius and its freezing point is 28 degrees Celsius.
What is the state of X at 40 degree Celsius?
Liquid
Why did the mist from the mouth of a kettle disappear after a while?
The mist gained heat and evaporated to form water vapour which was invisible.
What happened to the water in a wet hankerchief?
The water evaporated.