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?

Which of the following are chemical changes 1 growth of a plant 2 rust

1.	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?
Answer» l 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.