Reversible Changes Quiz

What happens when you burn wood?

• It turns into a tree

• It turns into firewood

• It turns into charcoal

• It turns into smoke and ash

What happens when vinegar and bicarbonate of soda are mixed?

• They form a solid

• They form a gas

• They form bubbles of carbon dioxide

• They form a liquid

What is an example of a reversible reaction?

• Mixing vinegar and bicarbonate of soda

• Burning wood

• Heating a raw egg

• Freezing water into ice

What is a reversible reaction in the context of chemical reactions?

• A reaction where you can get back the substances you started with

• A reaction that cannot be changed back

• A reaction that involves heat

• A reaction that involves mixing substances

What is an example of an irreversible change?

• Burning wood

• Melting an ice cube

• Stirring sand into water and then filtering it out

• Freezing water into ice

What happens when you heat a raw egg?

• It turns into a chicken

• It turns into an omelette

• It turns into a boiled egg

• It turns into a scrambled egg

What happens in a chemical reaction?

• The reaction can always be reversed

• No change occurs

• New materials are always formed

• The substances remain the same

What is the difference between irreversible and reversible reactions?

• Irreversible reactions cannot be changed back, reversible reactions can

• There is no difference

• Irreversible reactions can be changed back, reversible reactions cannot

• Irreversible reactions involve heat, reversible reactions do not

What is an example of a chemical reaction?

• Mixing oil and water

• Burning a candle

• Freezing water into ice

• Stirring sand into water

What is the effect of heating on substances in chemical reactions?

• It has no effect

• It can prevent a chemical reaction

• It can cause an irreversible change

• It can cause a reversible change