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प्रश्न
Name the elements which form water.
How will you justify that water is a compound?
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उत्तर
The elements which form water are Hydrogen and oxygen.
Justification: Water has entirely different properties (i.e. is a liquid, extinguishes fire) from the elements it is made up of i.e. Hydrogen a gas catches fire oxygen a gas supporter of combustion.
1. Energy is needed to form water on combining O2 with H2.
2. We can not separate the constituents of water by simple physical means.
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संबंधित प्रश्न
What are the different types of mixtures ?
Name the elements present in Sugar
Name the elements present in Ammonia
What is the proportion of element present in the following compound?
H2O
What is the proportion of element present in the following compound?
CaO
What is the proportion of element present in the following compound?
NO2
Name two compounds which dissolve in water.
State four differences between compounds and mixtures.
Tabulate a comparative chart – to differentiate between elements, compounds, and mixtures. Differentiate them with reference to properties
Write the chemical formula and name the elements present in the following compounds.
- Sodium chloride
- Potassium hydroxide
- Carbon dioxide
- Calcium oxide
- Sulphur dioxide
Assertion: Oxygen is a compound.
Reason: Oxygen cannot be broken down into anything simpler.
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 |
Mention the uses of the following compounds.
- Baking soda
- Bleaching powder
- Quick lime
Sodium chloride is used as table salt and for flavoring and preserving food.
Higher-Order Thinking questions:
Why is water considered a compound?
Reason out
Sand is also known as silica.
A compound has a definite ______.
A compound has a fixed ______.
Name the compounds used in fertilizers.
