Help!!?

a) can anyone give one example of a chemical reaction the requires energy?

b)can anyone give one example of a chemical reaction the releases energy?

c) can anyone give me one example of a chemical reaction the shows a change in colour?

Answer:
Photosynthesis

Respiration

Burning something. Peeing on a stick (if you're pregnant).
1. Burning wood. Wood won't turn charred, unless you add energy...fire.
2. A bomb-more specifically TNT-the released energy is the explosion
3. Putting iodine on starch turns it from purple to black
a CH4 + Cl2 = CClH3 + HCl

b Na(s) + 0.5Cl2(s) = NaCl(s)

c C6H6 + HBr
a) lab preparation of O2 from KClO3

b) combustion of carbon into CO2.

c) Add some H2O2 to an acidified oln of KMnO4 which is violet colored, the color immediately disappears turning the soln colorless.

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