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प्रश्न
Tabulate a comparative chart – to differentiate between elements, compounds, and mixtures. Differentiate them with reference to properties
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उत्तर
Properties
Elements – Elements have a definite set of properties. Elements classified into metal and non-metals each with its own properties.
Compounds – Compounds have a definite set of properties. Elements of a compound do not retain their original properties.
Mixtures – Mixture not have a definite set of properties. Components of a mixture do retain their original properties.
संबंधित प्रश्न
Write true or false
A heterogeneous mixture has a uniform composition throughout the mixture.
Write true or false
The constituents of a mixture can only be separated by chemical means.
The methods of separating components of a given mixture are based on the
Name the elements which form water.
How will you justify that water is a compound?
What is the proportion of element present in the following compound?
NO2
Write the molecular formulae of compound calcium oxide.
Write the molecular formulae of compound hydrogen sulphide.
Explain the term compounds.
Give the example of a compound containing hydrogen and oxygen.
Give the example of a compound containing nitrogen and oxygen.
Tabulate a comparative chart – to differentiate between elements, compounds, and mixtures. Differentiate them with reference to the term
What is the molecular formula of the following compound?
Hydrochloric acid
State true of false. If false, give the correct statement.
Compounds and elements are pure substances.
Write the chemical formula and name the elements present in the following compounds.
- Sodium chloride
- Potassium hydroxide
- Carbon dioxide
- Calcium oxide
- Sulphur dioxide
What are compounds? Give two examples.
Match the following.
| Iron | For making wires |
| Copper | Sewing needle |
| Tungsten | As a fuel for ignition in rocket |
| Boron | Making the filament of a bulb |
Write any two properties of a compound.
Complete the table
| Compound | Constituent elements |
| Sodium carbonate | Sodium, Carbon. Oxygen |
| Water | |
| Calcium oxide | |
| Sugar | Carbon, Hydrogen, Oxygen |
The other name for potassium hydroxide is caustic potash.
A compound has a fixed ______.
