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This topic is all about chemical reactions and how we can tell that a chemical reaction has taken place.
Not all changes are chemical reactions.
For example when ice melts, it changes from being a solid to a liquid this is a physical change not a chemical reaction. Also when nail varnish dries it look different on the nails to how it looked in the bottle but no new substance has been produced so no chemical reaction has taken place.
Ice melting is an example of a physical change and not a chemical reaction. No new substance has been made.
Some examples of chemical reactions include:
Mixing two solutions to produce a gas.
A leaf growing on a tree.
Petrol burning in a car engine.
Burning wood on a fire.
Food digesting in the stomach.
Making toast from bread.
Mould forming on stale bread.
A chemical reaction is a chemical change which results in one or more new substances being formed. The change is usually not reversible.
A physical change has no new substance or substances being made. The change is reversible.
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