Please select a subject first
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Give two example of the following:
The substances which do not change their state on heating.
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When sodium chloride is added to a definite volume of water and stirred well, a solution is formed, but there is no increase in the level of water. Why?
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What do you observe when a gas jar which appears empty is inverted over a gas jar containing Bromine vapours? Name the phenomenon.
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Why can a piece of chalk be broken easily into smaller pieces while a coal piece cannot be broken easily?
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If an object weighs 6 kg on earth. What will be its weight on moon ?
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If an object is taken to the moon from the earth what will be its mass ?
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Classify the following into solids, liquids and gases.
Oxygen, milk, common salt, wax, stone, water vapour, carbon-dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.
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Why do solids, liquids and gases differ in their physical states ?
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What are fluids ? Give two examples.
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Define interconversion of states of matter.
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What are the two conditions for the interconversion of states of matter ?
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How a liquid changes into its gaseous state ? Explain ?
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Water cycle is an example of inter conversion of states of water. Explain.
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State the general properties of a solid.
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Give reason for the following.
Pure substances have fixed melting or boiling points.
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Give reason for the following.
Electricity is not considered matter.
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