Reversible? Heating and Cooling 1
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  • Introduction
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 You have often added substances to water and seen them heated; the question is - do they stay like that forever? Do they go back to what they started like? Can they be made to return to their original state or is the change permanent?

This series of questions will give you a chance to look over some basic changes when materials are heated and cooled.

  • Question 1
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What happens to a solid like chocolate or butter when it is heated?

dissolves

melts

solidifies

  • Question 2
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Is this change reversible or irreversible?

Reversible

Irreversible

  • Question 3
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What happens to a liquid like water when it is heated?

boils

condenses

liquifies

  • Question 4
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Is this change reversible or irreversible?

Reversible

Irreversible

  • Question 5
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What happens when some sugar is stirred into water?

disappears

dissolves

melts

  • Question 6
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Is this change reversible or irreversible?

Reversible

Irreversible

  • Question 7
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You accidentally drop your padlock key into the toilet.  Is this an irreversible change - can you get it back?

Reversible

Irreversible

  • Question 8
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You accidentally drop your mobile phone into the toilet.  Is this an irreversible change - will it still work?

Reversible

Irreversible

  • Question 9
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You notice that an old nail holding your gate post together has a browny-looking substance on its surface. What do you think that is?

wood preserver

bird dropping

rust

  • Question 10
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Do you think that the nail has changed permanently or not?

Permanent change

Temporary change

Progress