Fifth Class science · A.2 · Matter
Physical and chemical changes
Some changes only move things around (like melting), while others create a completely different substance—like when baking soda and vinegar mix.
See worked examples
Ines mixes lemon juice and baking soda. What happens?
- It becomes a solid block
- It just gets colder
- A gas forms (right)
Sam and Jonah are curious. A piece of paper burns and turns to ash. What kind of change occurs?
- Chemical (right)
- Physical
- Same
Luca mixes lemon juice and baking soda. What happens?
- It becomes a solid block
- A gas forms (right)
- It just gets colder
Tip: Some changes only move things around (like melting), while others create a completely different substance—like when baking soda and vinegar mix.
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