ICAS Chemical Sciences (Matter and Materials)

Question 1

What is the name for liquid water turning into water vapour?

Accepted Answer

Evaporation

Answer

Evaporation is a liquid changing into a gas. Condensation is the reverse: gas turning back into liquid.

Question 2

Which of these is a chemical change?

Accepted Answer

Paper burning

Answer

Burning makes new substances (ash, carbon dioxide, water vapour) and cannot be reversed, so it is a chemical change. The others are physical changes where the substance stays the same.

Question 3

Which method is best for separating sand from water?

Accepted Answer

Filtration

Answer

Sand doesn't dissolve in water. Pouring the mixture through filter paper lets the water pass and traps the sand.

Question 4

At what temperature does pure ice melt at normal air pressure?

Accepted Answer

0 °C

Answer

Pure water ice melts at 0 °C at standard atmospheric pressure. 100 °C is the boiling point, and 32 is the melting point in Fahrenheit, not Celsius.

Question 5

Which state of matter has a fixed shape and a fixed volume?

Accepted Answer

Solid

Answer

The particles in a solid are tightly packed and held in place, so a solid keeps its own shape and volume. Liquids take the shape of their container, and gases fill it completely.

(ICAS) ICAS Practice Test

(ICAS) ICAS Practice Test

ICAS Chemical Sciences (Matter and Materials)