The event always involves a chemical change is burning.
The changes experienced by matter can be:
- Physical changes: the nature of matter is not altered. The substance remains the same. Phase changes are physical changes.
- Chemical changes: there are chemical reactions and new substances are formed.
Which event always involves a chemical change?
- boiling. No. This is a phase change in which matter goes from liquid to gas.
- melting. No. This is a phase change in which matter goes from solid to liquid.
- conducting. No. Electrons flow during the conducting but no new substances appear.
- burning. Yes. A substance reacts with oxygen to form carbon dioxide and water.
The event always involves a chemical change is burning.
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