Which material can easily burn when exposed to heat?, Paper, Glass, Stone, What happens to an iron nail when it is left outside for a long time?, It melts, It rusts, It disappears, Which material can decompose naturally?, Banana peel, Plastic bottle, Glass jar, What happens when vinegar is mixed with baking soda?, It freezes, It produces bubbles, Nothing happens, Why is it important to know the chemical properties of materials?, To use and dispose of materials safely., To make materials heavier., To change their color.

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