Which of the following are chemical changes 1 growth of a plant 2 rustening of iron 3 mixing of iron fillings and sand 4 cooking of food 5 digestion of food 6 freezing of water 7 burning of a candle?
Answers
Chєmícαl chαngє :- A type of change in which a new substance is formed after the reaction.
--------------
Q) Which of the following are chemical changes ?
1) Growth of a plant ✔
2) Rusting of iron ✔
:3) Mixing of iron fillings and sand ✘
4) Cooking of food ✔
5) Digestion of food ✔
6) Freezing of water ✘
7) Burning of a candle ✔
--------------
Extra info :-
▪ Growth of a plant is a chemical change as there are many changes happening during the growth process.
▪ Rusting of iron is a chemical change as iron reacts with air to produce a new substance rust.
▪ During cooking, the chemical composition of the food changes, hence it is chemical change.
▪ Digestion is also a chemical change as the food gets broken down into simpler substances.
▪ Burning of candle produces, heat therefore it is also a chemical change.
Among these Rusting of iron, cooking of food, Burning of a candle are chemical changes.