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A. Is straining cooked pasta from water a physical or chemical separation?
B. Is using a fuel cell to separate water into hydrogen and oxygen a physical or chemical separation?
C. Which type(s) of matter (mixtures/compounds/elements) could be separated by physical methods ?
D. Which type(s) of matter (mixtures/compounds/elements) would need to be separated by chemical methods?
Explain all of the above .

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A) Answer is: physical separation, because there is no reaction and new substance is not synthesise.

B) Chemical separation, old bonds are broken and new ones are formed.

Chemical reaction: 2H₂O → 2H₂ + O₂.

C) Mixtures, because there are no chemical bonds between substances in the mixture.

D) Compounds, because chemical bonds betwwen elements in the compounds must be broken.

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