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Question
What do you understand by Phase changes? Explain. [2 MARKS]
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Solution
Definition: 1 Mark
Explanation: 1 Mark
Phase changes are changes that occur when substances are melted, frozen, boiled, condensed, sublimated, or deposited.
They are also termed as physical changes because they do not change the nature of the substance
Boiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water (H2O). If the bubbles were caused by the decomposition of a molecule into a gas (such as H2O →H2 and O2), then boiling would be a chemical change.
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Explanation: 1 Mark
Phase changes are changes that occur when substances are melted, frozen, boiled, condensed, sublimated, or deposited.
They are also termed as physical changes because they do not change the nature of the substance
Boiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water (H2O). If the bubbles were caused by the decomposition of a molecule into a gas (such as H2O →H2 and O2), then boiling would be a chemical change.
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