The Mega Yr 9 Chemistry Quiz

What is the smallest unit of matter?

• Molecule

• Atom

• Proton

• Electron

Which state of matter has a definite shape and volume?

• Solid

• Liquid

• Gas

• Plasma

In which state of matter do particles move the fastest?

• Solid

• Liquid

• Plasma

• Gas

Which of the following is an example of a physical change?

• Burning wood

• Rusting iron

• Melting ice

• Baking a cake

Which of the following is a chemical change?

• Dissolving salt in water

• Cutting a piece of paper

• Boiling water

• Frying an egg

What happens to molecules in a substance during a physical change?

• They form new substances

• Their structure changes permanently

• They remain the same, but their arrangement may change

• They disappear

Which of the following is a strong indicator of a chemical change?

• A change in shape

• The formation of a new substance

• A substance melting into a liquid

• A substance dissolving in water

What is happening when bubbles form in a liquid during a reaction?

• A physical change is occurring

• Gas is being produced as a result of a chemical change

• The substance is melting

• It is dissolving

When a candle burns, why is it considered a chemical change?

• The wax melts

• The candle changes shape

• The burning wick produces light and heat, forming new substances like carbon dioxide

• The wax can be reshaped

A glow stick emits light when it is bent and the chemicals inside mix. What type of evidence of chemical change is this?

• A temperature change

• Light production

• Formation of a precipitate

• Dissolving of a substance