Physical and Chemical Changes Revision Quiz

What is the process called when solid iodine changes directly into gas without becoming liquid first?

• a Evaporation

• b Condensation

• c Sublimation

• d Freezing

In which state(s) are the particles closely packed together?

• a Solids only

• b Gases only

• c Solids and liquids

• d Liquids and gases

Seren dissolves some salt in her soup. What is the salt?

• a the solution

• b the solvent

• c the solute

• d the mixture

Rohan is conducting an experiment in his science class. He has a sample of nitrogen at room temperature and begins to cool it down (nitrogen's boiling point -196°C). What will happen to the nitrogen when it reaches −196 °C?

• a It will evaporate.

• b It will boil.

• c It will condense.

• d It will freeze.

George and Leo are in the kitchen experimenting with different cooking techniques. Which of these changes is NOT a chemical reaction?

• a Frying an egg

• b Melting butter

• c Baking a cookie

• d Digestion in your body

The arrows on the diagram labelled A–D show changes of state.

Place the label on the correct letter.

a

b

c

d

Melting

Freezing/Solidification

Boiling/evaporating

Condensation

Neha is conducting an experiment with bromine, which has a melting point of –7 °C and a boiling point of 59 °C. At what temperature would bromine be in a gaseous state during her experiment?

• -10 °C

• 27 °C

• 60 °C

Emily is conducting an experiment with bromine, which has a melting point of –7 °C and a boiling point of 59 °C. At what temperature would bromine be in a gaseous state during her experiment?

• –10 °C

• 0 °C

• 60 °C

Leo is conducting an experiment to study the states of matter. He observes that bromine has a melting point of –7 °C and a boiling point of 59 °C. At what temperature would bromine be in a liquid state during his experiment?

• –10 °C

• 25 °C

• 65 °C

The sentences below describe the arrangement and motion of particles in a liquid. The particles are packed closely together with no gaps / packed closely together with some small gaps / spread far apart with large gaps.

• packed closely together with no gaps

• packed closely together with some small gaps

• spread far apart with large gaps