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Question
Select the chemical changes from the following list of changes
Breaking of glass
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Solution
Breaking of glass is a PHYSICAL change as no change in composition takes place, no new substance is formed.
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3. Physical changes are
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- periodic,
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- irreversible.
Write true or false for the statement
Decomposition of leaves is a fast change.
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
Make a list of different types of changes with example.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Which of the following are physical changes and which are chemical changes ?
Freezing of water
Which of the following are physical changes and which are chemical changes ?
Glowing of an electric bulb
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Slow and fast change.
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
