14 de gen. 2013

REVERSIBLE OR IRREVERSIBLE?

Watch the video and answer to these questions:


Is evaporating water a reversible or irreversible change? Why?
Is condensating water a reversible or irreversible change? Why?
Is freezing water a reversible or irreversible change? Why?
Is melting water a reversible or irreversible change? Why?
Is mixing salt with water a reversible or irreversible change? Why?
Is mixing cement with water a reversible or irreversible change? Why?
Is burning a reversible or irreversible change? Why?