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प्रश्न
Tabulate a comparative chart – to differentiate between elements, compounds, and mixtures. Differentiate them with reference to Separation of compound
उत्तर
Separation of compound
Elements –Elements occur on their own or as compounds and can be separated by chemical and physical methods. Example: Iron, copper.
Compounds – Elements in a compound are chemically combined and can be separated by chemical methods only. Example: Iron Sulphide, copper oxide.
Mixtures – Components in a mixture can be separated by physical methods only.
Example: Iron + sulphur
संबंधित प्रश्न
Write true or false
Handpicking can be used as a separation technique if the particle size of the constituents of the mixture is the same.
State four important characteristics of compounds
Name the elements present in Sugar
Name the elements present in Marble
What is the proportion of element present in the following compound?
CaO
Name two compounds which dissolve in water.
State three differences between water and air.
Give the example of a compound containing carbon and oxygen.
What is the molecular formula of the following compound?
Hydrochloric acid
Explain the difference between Mixture and compounds.
What are compounds? Give two examples.
Assertion: Oxygen is a compound.
Reason: Oxygen cannot be broken down into anything simpler.
Assertion: Air is a compound.
Reason: Air consists of carbon dioxide.
State whether true or false. If false, correct the statement.
A compound cannot be broken into simpler substances chemically.
State whether true or false. If false, correct the statement.
Aspirin is composed of 60% Carbon, 4.5% Hydrogen and 35.5% Oxygen by mass. Aspirin is a mixture.
Sodium chloride is used as table salt and for flavoring and preserving food.
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is known to form the largest number of compounds.
Write any two properties of a compound.
Reason out
Sand is also known as silica.
