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chemical reactions
chmical or physical changes and testing gases
Question | Answer |
---|---|
frost forming | physical - reversible, still water |
burning toast | chmical - change colour, change taste, not reversible |
dissolving instant coffee | physical - still coffee, is reversible |
iron nail rusting | chemical - changing colour, new material, not reversible |
hydrogen | light it - pop |
carbon dioxide | add lime water- milky |
Chlorides | are made when hydrochloric acid is used. |
Sulphates | are made when sulphuric acid is used. |
Nitrates | are made when nitric acid is used. |