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Question                                                      On what       Open/Closed?
                                                              strand of     Suitable for thinking
                                                              Blooms would time?
                                                              you place it?
Predict if a candle burning is a physical or chemical
change? Justify your answer.
Describe what you see when a candle burns.
When I blow the candle out I can still light the wick
and I don’t have to even touch it. How is this working?
Can you summarise the physical changes that are taking
place?
Where do the atoms from a candle go when it’s burnt?
What would you expect to happen to the mass of the
candle when it burns?
Will the candle burn for longer or shorter in a larger
beaker?
Why do you think the candle will burn for longer?
What further experiments could we do to prove that
oxygen is definitely being used up in burning?
Describe how you would carry the experiments out.
Why do you think the beaker starts to ‘go misty’?
Is the ‘misty substance’ wax?
If I tell you that the chemical elements in a candle are
carbon and hydrogen. What do you think the liquid formed
on the sides of the beaker might be?
Explain how the misty substance might have been formed?
Can you link the misty substance to the fact that oxygen is
required for burning?
How could we test to see what happens to the carbon in
the wax?
The limewater has turned milky. What does that prove?
If you measured the total mass of the beaker and the
candle before and after burning (assuming nothing
could leave or enter the beaker) what would happen?
Using the symbols C, H and O can you draw a picture to
show why the mass of the beaker would stay the same?
How can you explain a chemical change, try and use
the words ‘atom’ , ‘re-arrangement’, ‘created’ and
‘destroyed’ in your answer.
If I burnt a piece of magnesium instead what would
happen to its mass? Can you explain why?
How have your views about burning changed?
What pieces of evidence forced you to change your
mind?

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Questioning mini bite

  • 1. Question On what Open/Closed? strand of Suitable for thinking Blooms would time? you place it? Predict if a candle burning is a physical or chemical change? Justify your answer. Describe what you see when a candle burns. When I blow the candle out I can still light the wick and I don’t have to even touch it. How is this working? Can you summarise the physical changes that are taking place? Where do the atoms from a candle go when it’s burnt? What would you expect to happen to the mass of the candle when it burns? Will the candle burn for longer or shorter in a larger beaker? Why do you think the candle will burn for longer? What further experiments could we do to prove that oxygen is definitely being used up in burning? Describe how you would carry the experiments out. Why do you think the beaker starts to ‘go misty’? Is the ‘misty substance’ wax? If I tell you that the chemical elements in a candle are carbon and hydrogen. What do you think the liquid formed on the sides of the beaker might be? Explain how the misty substance might have been formed? Can you link the misty substance to the fact that oxygen is required for burning? How could we test to see what happens to the carbon in the wax? The limewater has turned milky. What does that prove? If you measured the total mass of the beaker and the candle before and after burning (assuming nothing could leave or enter the beaker) what would happen? Using the symbols C, H and O can you draw a picture to show why the mass of the beaker would stay the same? How can you explain a chemical change, try and use the words ‘atom’ , ‘re-arrangement’, ‘created’ and ‘destroyed’ in your answer. If I burnt a piece of magnesium instead what would happen to its mass? Can you explain why? How have your views about burning changed? What pieces of evidence forced you to change your mind?