How many types of physical change are possible? Watch

tropical-twist3
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My 10 yr old sister just asked me, I'm embarrassed that I don't know what she's on about, but it's in a quiz she was given for homework.
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Glutamic Acid
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It'll either be seven or three. Because that's how these things work.
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rottcodd
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Does it mean physical change as in change between different states of matter? In that case: solid to liquid, liquid to solid, liquid to gas, gas to liquid, gas to solid, solid to gas...And then maybe you include plasma as a state? Ask in the physics subforum if I were you.

Edit: If it was for 10 year olds homework, then it won't be what I just said. So ignore that, I'm talking out of my bum hole.
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mollymustard
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Reversable and irreversable.
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tropical-twist3
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oh ok, thanks!
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Glutamic Acid
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Well, all I could think of was puberty...
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tropical-twist3
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also, is making concrete a chemical change or physical change? I remember you mix sand with something..
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tropical-twist3
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(Original post by Glutamic Acid)
Well, all I could think of was puberty...
what so are you right or not?

ooh, its given three answers

a)3 b)4 c)5
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Mithra
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(Original post by tropical-twist3)
also, is making concrete a chemical change or physical change? I remember you mix sand with something..
Chemical . I always remember that because you can still let concrete set underwater :p:.

I would assume if its chemistry homework they will want evaporation, melting, freezing etc...
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tropical-twist3
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(Original post by rottcodd)
Does it mean physical change as in change between different states of matter? In that case: solid to liquid, liquid to solid, liquid to gas, gas to liquid, gas to solid, solid to gas...And then maybe you include plasma as a state? Ask in the physics subforum if I were you.

Edit: If it was for 10 year olds homework, then it won't be what I just said. So ignore that, I'm talking out of my bum hole.
thats what I thought but it doesn't say and I'm trying to think what it's aiming for in a 10 yr olds homework. questions I'm stuck on:

physical changes:
a)3 b)4 c)5
?

and


making concrete:
chemical or physical?


to be honest I should know them, but I'm unsure of the definitions they use at their age. with the concrete, I don't know if they mean physical change to just be gas>liquid, so then it would be chemical, but then I couldn't remember if any chemical reactions take place in making concrete or whether its just a mixture.
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tropical-twist3
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(Original post by Mithra)
Chemical . I always remember that because you can still let concrete set underwater :p:.

I would assume if its chemistry homework they will want evaporation, melting, freezing etc...
yeah I thought its likely to be that. I can't believe a ten yr old's homework has caused this confusion haha
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Mithra
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(Original post by tropical-twist3)
yeah I thought its likely to be that. I can't believe a ten yr old's homework has caused this confusion haha
Ooh thats a thought though, maybe they just mean physical as in from a liquid to a solid .

To be honest I'm not surprised about the confusion it has caused though :p:. Considering how often you are told that 'everything you have learnt in X up until now has been wrong', especially in the sciences, its not surprising that almost we could probably justify almost any answer on her homework .
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