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State the process of condensation.Why is the rusting of iron classified as a slow change?What is an endothermic change?What are non-periodic changes?How can salt be recovered from a salt solution?Give two examples of natural changes.Write the chemical equation for respiration in living organisms.What are physical properties of a substance?Why is the digestion of food classified as a chemical change?What is a periodic change?Why is the ripening of a tomato considered a chemical change?Why do water droplets appear on the outer surface of a glass containing ice cubes?What is observed when a lighted matchstick is brought near the mouth of a test tube releasing hydrogen gas?Provide two examples of fast changes.Why is magnetising a piece of iron considered a physical change?What happens to the magnetic properties of iron when it is heated strongly with sulphur?Define a physical change.What are human-made changes?Name three substances that undergo sublimation.What is an exothermic change?Why is the curdling of milk an irreversible change?How does evaporation differ from boiling in terms of where it takes place?How can we demonstrate that mixing iron filings and sulphur powder is a physical change?Why is rainfall sometimes considered both a desirable and an undesirable change?Define a chemical change.
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Chapter: 02. Physical And Chemical Changes
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