Per què suren els cossos?

 [youtube]https://www.youtube.com/watch?v=5gEiV6gHb1M[/youtube]

[youtube]https://www.youtube.com/watch?v=jnWbhqIDJVI#t=13[/youtube]

[youtube]https://www.youtube.com/watch?v=XKvL-T-Xk4Q[/youtube]

[youtube]https://www.youtube.com/watch?v=eHecjZvrCT8[/youtube]

[youtube]https://www.youtube.com/watch?v=Oih8sTeDMFk[/youtube]

[youtube]https://www.youtube.com/watch?v=9NNjeJ_EpZk[/youtube]

[youtube]https://www.youtube.com/watch?v=NfbaMniJgz0[/youtube]

 Separació de mescles

Canvis físics i canvis químics

[youtube]https://www.youtube.com/watch?v=L1eVzXi45Ic[/youtube]

[youtube]https://www.youtube.com/watch?v=RsoqI6XD19U[/youtube]

[youtube]https://www.youtube.com/watch?v=bJObalggF0s[/youtube]