What is evaporation?
It is when a liquid turns into a gas.
Explain the process of evaporation.
It happens because some particles in the liquid gain heat energy making them move faster and further apart until they escape from the surface of the liquid.
Name a factor that speeds up evaporation.
Heat speeds up evaporation.
Name two ways that people use evaporation.
Drying our hair, drying our clothes, making some kinds of food.
Give an example of a solute.
salt, sugar, coffee powder (any solid that can be dissolved)
Give an example of a solvent that we use everyday.
The most common solvent is water.
What do we get when we mix a solute and a solvent?
A solution.
What happens to the solute when it is stirred into a solvent?
It dissolves.
What is condensation?
It is when a gas changes to a liquid.
Explain the process of condensation.
When gas particles cool down and lose heat energy, they change into a liquid.
Where in the water cycle does evaporation happen?
Water evaporates from rivers, lakes, seas, and plants.
What are formed when water vapour condenses in the atmosphere?
Clouds.
How does evaporated water in the atmosphere get back to Earth?
It falls as rain or snow.
What is the boiling point of pure water?
100 degrees Celcius.
What do we call the temperature at which a liquid boils?
The boiling point.
What is the change in state of matter during melting?
solid + heat = liquid
