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प्रश्न
State two characteristics of water which prove that it is a – compound.
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उत्तर
Characteristics of compounds
- Elements in a compound are present in a definite proportion. Example 2 atoms of hydrogen combine with 1 atom of oxygen to give 1 molecule of water (compound) H2 + O = H2O (water)
- Compounds have a definite set of properties
Example: The properties of the compound water are different from the properties of the elements of hydrogen and oxygen in the water.
संबंधित प्रश्न
Fill in the blank
In a _______ the substances are not combined chemically.
Select the correct alternative from the choices given for the following statement:
A set of mixture is
Write true or false
The constituents of a mixture can only be separated by chemical means.
What is the difference between a pure substance and a mixture ?
Define Compounds
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?
CO2
Name two compounds which dissolve in water.
Write the molecular formulae of compound calcium oxide.
Write the molecular formulae of compound lead sulphide.
What is the molecular formula of the following compound?
Hydrochloric acid
What is the molecular formula of the following compound?
Methane
Explain the difference between Mixture and compounds.
Write the chemical formula and name the elements present in the following compounds.
- Sodium chloride
- Potassium hydroxide
- Carbon dioxide
- Calcium oxide
- Sulphur dioxide
What is meant by compound?
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
Write any two properties of a compound.
Higher-Order Thinking questions:
Why is water considered a compound?
Reason out
Sand is also known as silica.
