SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which action creates a new substance?
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freezing your leftovers
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a match on fire
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mixing your peas and mashed potatoes
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crushing ice
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Explanation:
Detailed explanation-1: -(b) During the combustion of a match, cellulose in the match and oxygen from the air undergo a chemical change to form carbon dioxide and water vapor.
Detailed explanation-2: -When you rub the head of the matchstick on the striking surface of the matchbox, some heat is generated due to the friction. This heat breaks a small part of the red phosphorus chain. After that some red phosphorus transforms into white phosphorus. White phosphorus is a highly volatile chemical and ignites in the air.
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