SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A physical change cannot be reversed
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A physical change is a change in state
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A physical change is a change in form
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A physical change is where new substances are formed
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Detailed explanation-1: -During a physical change the physical properties of a substance like shape, size or state of matter changes but there is no formation of a new substance. This change is reversible in nature and hence it is temporary in nature.
Detailed explanation-2: -The true statement about physical changes and chemical changes is-C) chemical changes always produce new substances. There are two types of change in nature-physical change and chemical change. It is a temporary change in which no new substances are formed but only the physical properties of substances are changed.
Detailed explanation-3: -Statement 1 is correct: A substance is said to undergo a physical change if only the physical properties such as the substance’s form, size, colour, state or appearance change.
Detailed explanation-4: -Cutting logs of wood into small pieces is a physical change because no new substance is produced or formed. Burning of wood, Ripening of fruit, and Cooking of food are chemical changes because a new substance is formed in them and they are not reversible.
Detailed explanation-5: -Physical changes include transitions from one state to another, such as from solid to liquid or liquid to gas. Cutting, bending, dissolving, freezing, boiling, and melting are some of the processes that create physical changes.