SSC
CHEMISTRY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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catalyst
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energy
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activation energy
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decomposition
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chemical changes
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Detailed explanation-1: -In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed. The distinction between physical and chemical change is not clear cut.
Detailed explanation-2: -Matter is capable of undergoing changes, which are classified as either physical or chemical.
Detailed explanation-3: -Answer: Solution: Change in state of matter is a physical change because of the physical condition and appearance changes but not the chemical composition.
Detailed explanation-4: -Physical changes are changes in the physical properties of substances. No new substances are formed in these changes. These changes may be reversible. In chemical changes new substances are produced.