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Question
Tabulate a comparative chart – to differentiate between elements, compounds, and mixtures. Differentiate them with reference to Separation of compound
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Solution
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
RELATED QUESTIONS
Name the process by which the components of following mixtures can be separated.
- Iron and sulphur
- Ammonium chloride and sand
- Common salt from sea water
- Chaff and grain
- Water and mustard oil
- Sugar and water
Write true or false
A heterogeneous mixture has a uniform composition throughout the mixture.
What is the difference between a pure substance and a mixture ?
Name the elements which form water.
How will you justify that water is a compound?
Name the elements present in Ammonia
Name the elements present in Marble
What is the proportion of element present in the following compound?
CO2
What is the proportion of element present in the following compound?
NO2
State three differences between water and air.
Write the molecular formulae of compound calcium oxide.
Write the molecular formulae of compound hydrogen sulphide.
Write the molecular formulae of compound lead sulphide.
Explain the term compounds.
State two characteristics of water which prove that it is a – compound.
What are compounds? Give two examples.
Assertion: Air is a compound.
Reason: Air consists of carbon dioxide.
Sodium chloride is used as table salt and for flavoring and preserving food.
Which of the following are not compounds?
- Chlorine gas
- Potassium chloride
- Iron
- Iron sulphide
- Aluminium
- Iodine
- Carbon
- Carbon monoxide
- Sulphur powder
Higher-Order Thinking questions:
Why is water considered a compound?
