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Reversible? Heating and Cooling 1

In this worksheet, students will be helped to review a variety of changes to a selection of materials, asking them to decide whether the change can be reversed or not.

'Reversible? Heating and Cooling 1' worksheet

Key stage:  KS 2

Curriculum topic:  Properties and Changes of Materials

Curriculum subtopic:  Reversible Changes

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

 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?

 

Questioning child

 

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

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

dissolves

melts

solidifies

Is this change reversible or irreversible?

Reversible

Irreversible

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

boils

condenses

liquifies

Is this change reversible or irreversible?

Reversible

Irreversible

What happens when some sugar is stirred into water?

 

Sugar in water

disappears

dissolves

melts

Is this change reversible or irreversible?

Reversible

Irreversible

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

Reversible

Irreversible

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

Reversible

Irreversible

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

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

Permanent change

Temporary change

  • Question 1

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

CORRECT ANSWER
melts
EDDIE SAYS
When chocolate is heated the little particles of chocolate start to move around so much the chocolate loses its structure and becomes a liquid - that's melting.
  • Question 2

Is this change reversible or irreversible?

CORRECT ANSWER
Reversible
EDDIE SAYS
If the molten chocolate is cooled down, the little particles slow down (less energy) and the chocolate becomes solid again (although it will be a bit of a different shape as you may have found on a hot day after putting your choc bar into the fridge!).
  • Question 3

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

CORRECT ANSWER
boils
EDDIE SAYS
The little particles of water get so much heat energy they whizz around really fast and start to jump out of the liquid as steam - that's boiling.
  • Question 4

Is this change reversible or irreversible?

CORRECT ANSWER
Reversible
EDDIE SAYS
If steam is cooled down by touching a cold surface, the particles lose lots of energy and cool back down into liquid water - that's condensation!
  • Question 5

What happens when some sugar is stirred into water?

 

Sugar in water

CORRECT ANSWER
dissolves
EDDIE SAYS
The sugar mixes with the water and breaks up into tiny particles of sugar too small to see ... but they are still there!
  • Question 6

Is this change reversible or irreversible?

CORRECT ANSWER
Reversible
EDDIE SAYS
The sugar is still in the water, although really tiny. If you evaporate the water away carefully, the sugar crystals are left behind, so it is reversible. If you do it too quickly you just get a brown sticky goo!
  • Question 7

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

CORRECT ANSWER
Reversible
EDDIE SAYS
Um - it rather depends on whether you've flushed the toilet! Let's assume you haven't - then it depends on whether you're prepared to put your hand down there...! But scientifically it's definitely reversible - the steel key will not react with the water immediately (and takes ages to go rusty).
  • Question 8

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

CORRECT ANSWER
Irreversible
EDDIE SAYS
Let's assume that you haven't spent loads and loads on a fully waterproof phone - that means that your phone is very sensitive to water and a dip in the toilet is likely to be terminal - you're going to need a new phone as all the circuit boards will have ceased to work. That's an irreversible change.
  • Question 9

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?

CORRECT ANSWER
rust
EDDIE SAYS
Rust forms on the surface of iron and steel objects left in a damp atmosphere: the air and water react with it to form rust.
  • Question 10

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

CORRECT ANSWER
Permanent change
EDDIE SAYS
Rust is a new substance formed from the iron and the air and water - it cannot easily be changed back into iron, so the change is irreversible (permanent).
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