Home-Based Learning Thanlyin (January Chapter End Test)

What is matter?

Answer explanation

Matter is anything that has mass and occupies space.

Define melting point.

Answer explanation

The temperature at which a solid changes to a liquid state at one atmospheric pressure is called melting point of the solid.

Define Freezing.

Answer explanation

Freezing is the process in which a liquid becomes sufficiently cold to change into a solid.

Define vaporisation.

Answer explanation

The temperature at which a solid changes to a liquid state at one atmospheric pressure is called melting point of the solid.

What is chemistry?

Answer explanation

Chemistry is a study of matter and the changes it undergoes.

Define ondensation.

Answer explanation

Condensation is the change from a gaseous state to its liquid state.

Define sublimation.

Answer explanation

Sublimation is the change of solid state directly into gaseous state without melting.

Define deposition.

Answer explanation

Deposition is the direct solidification of a vapour by cooling; the reverse of sublimation.

Define physical change.

Answer explanation

A physical change is a change in which no new substances are formed. There may be a temporary change in colour, temperature and state of the substances but no new substances are formed in the physical change.

There are five categories that classified chemistry on the time line.

• TRUE

• FALSE