Chemical Reaction in the World Around Us?

Question

What is a chemical reaction (besides rusting) that occurs around us in the world around?

Preferably a simple chemical reaction.

Answer 1

Silver tarnishing.
Burning natural gas for cooking.
Charcoal grill (burning charcoal).
Bleaching an ink or grass stain from clothing.
Copper pipes turning "green."
Cooking (think of boiling an egg).
Exploding gasoline vapor in an automobile engine.
Lighting a cigarette lighter (propane burning).
A burning candle (paraffin or wax).
Paper or leaves decomposing.
Electricity production from the chemicals in a battery.
Bread dough rising.
Fermentation of wine or beer.
Toast burning.
Making caramel.
Mixing Jello.
Treating hard water to remove minerals.
Acid rain dissolving limestone.
Ozone production by an electrical spark or lightening.
Oxygenation of exhaust gases by a catalytic converter on a car.
Baking a cake.
Making pickles.
just to name a few.

Answer 2

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The earth consists of 91 or 92 natural elements in many varied combinations. There is no one formula for the earth.

Answer 3

Perhaps somebody else can give you the actual formulae, but descaling a kettle is adding an acid to limescale (Calcium carbonate)

Answer 4

Digestion. Ripening of fruit, browning of cut fruit. burning of materials, cooking of protein.

Anything where you can see a color change or heat is given off.

Answer 5

couple are burning into ashes, decomposition (bursting of firecrackers), something that dissolves in water