Make a chart on A4 sheet of evidence of chemical reactions i. e. showing characteristics of chemical reactions with colours 2D and 3D pictures.
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Which of the following is a chemical reaction?
Freezing liquid mercury.
Adding yellow to blue to make green.
Cutting a piece of paper into two pieces.
Dropping a sliced orange into a vat of sodium dydroxide.
Filling a balloon with natural air.
Solution
A, B, C, & E involve only physical changes. A sliced orange has acid (citric acid) that can react with sodium hydroxide, so the answer is D.
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