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Further detail
1. What distinguishes a chemical reaction from a physical change?
2. Which observation provides evidence that a chemical reaction may have occurred?
3. What happens in a direct combination reaction?
What is a chemical reaction?
A process breaking and forming bonds to produce new substances.
What indicates a chemical reaction may have occurred?
Gas evolution, colour change, temperature change, light emission, or precipitate formation.
How are chemical reactions classified?
By how atoms or ions rearrange and bind together.
What are direct combination reactions?
Reactions where two or more substances combine to form a new compound.
How does magnesium react when heated in oxygen?
It burns with a bright white flame forming white magnesium oxide.
Why is a direct combination reaction?
Because two substances combine to form a new compound.
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