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Signs Of Chemical Change

1) Bubbles of gas appear

2) A precipitate forms

3) A color change occurs

4) The temperature changes

5) Light is emitted

6) A change in volume occurs

7) A change in electrical conductivity occurs

8) A change in melting point or boiling point occurs

9) A change in smell or taste occurs

10) A change in any distinctive chemical or physical property occurs

Rusting

What actually happens is this: the acetic acid (that's what makes vinegar sour) reacts with sodium bicarbonate (a compound that's in baking soda) to form carbonic acid.

Picture explains this chemical reaction

Lets look at five!

Bubbles of gas appear

A change in color occurred

three important pigments (chlorophyll, carotenoids, and anthocyanins) break down to contribute to the color changing of leaves.

Light is emitted

When a chemical reaction is produced, a light or change in temperature can occur, the picture below explains the chemical reaction

A change in smell or taste occurs

When an egg begins to smell, (a rotten egg) a chemical reaction has taken place. This is the result of a chemical decomposition

( proteins ) + heat ---> product ( the egg boiled )

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