minijumbuk
┗(^o^ )┓三
- Joined
- Apr 23, 2007
- Messages
- 652
- Gender
- Male
- HSC
- 2008
I know this is a pretty stupid question to ask, but I'm dying without the answer
I know about observing the following factors:
- Colour change
- Heat change
- New substances formed
But, say if we add cold milk into hot tea. Initially brown, the milk slowly turns it into white. Now there is a heat change, and a colour change.
So how do we know if this physical or a chemical change? I know it's obviously a chemical change, but what conclusive evidence is there, that could be made simply by observation?
I know about observing the following factors:
- Colour change
- Heat change
- New substances formed
But, say if we add cold milk into hot tea. Initially brown, the milk slowly turns it into white. Now there is a heat change, and a colour change.
So how do we know if this physical or a chemical change? I know it's obviously a chemical change, but what conclusive evidence is there, that could be made simply by observation?