States of Matter and Chemical Reactions

What are solids, liquids, and gases made of?

• Cells

• Atoms

• Rocks

• Fibres

In which state of matter are the particles furthest apart?

• Solid

• Liquid

• Gas

• Plasma

Which process describes how smells spread through the air?

• Conduction

• Evaporation

• Diffusion

• Filtration

What happens to particle movement when temperature increases?

• They slow down

• They stop moving

• They move in circles

• They move faster

Why does a balloon burst if it gets too hot?

• The balloon shrinks

• The gas condenses

• Gas pressure increases

• The particles disappear

What causes gas pressure?

• The size of the balloon

• Collisions of gas particles with surfaces

• The shape of the container

• The colour of the gas

Which of these is a physical change?

• Burning wood

• Baking a cake

• Melting ice

• Rusting metal

Which change is usually reversible?

• Frying an egg

• Mixing vinegar and baking soda

• Melting chocolate

• Burning a candle

What happens to particles when a solid melts?

• They stop moving

• They break apart

• They move further apart and slide past each other

• They disappear

What does a flat section on a cooling curve graph represent?

• The sample has frozen

• The sample is boiling

• The thermometer is broken

• No change is happening