Science 1

a technique by which an insoluble substance is formed in a solution by a chemical reaction is called ...

• precipitation

• precipitate

The insoluble sunstance formed is called the ...

• precipitate

• precipitation

The liquid left behind is called the ...

• supernate

• precipate

When a solid changes to a gas directly without going through a liquid stage is called ...

• sublimation

• precipitation

Sublimation is commonly used as a technique to ..... substances.

• purify

• precipitate

Daily applications of sublimation are ...

• dye sublimation is used in the colour printing

• dry ice sublimes at room temperature

• the sublimation of moth balls

• precipitation

The complete removal of water from food and other materials is called ...

• freeze-drying

• precipitation

Freeze-drying is used to ..... food

• preserve

• precipate

The force of attraction between objects and the earth is ...

• gravity

• precipitation

Force that pulls all objects downwards towards the centre of the earth is called ...

• gravitational

• frictional