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प्रश्न
What is meant by H20 and 3H2O
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उत्तर
H20 represents one molecule of water. 3H20 represents 3 molecules of water.
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संबंधित प्रश्न
State four differences between compounds and mixtures.
Give two applications of chromatography.
Give two examples of the following.
Non-metals which are lustrous
Fill in the blank
A liquid non-metal is _______.
Tick (√) the correct alternative from the choice given for the following statement.
Sugar is a compound which consists of the elements
Tick (√) the correct alternative from the choice given for the following statement.
Brass and bronze are
Complete the statement given below by filling in the blank with the correct word.
The basic unit of an element is an __________.
Give a reason for the following statement :
Brass & bronze are examples of mixtures, while copper sulphate & lead nitrate are examples of compounds.
Classify the following as elements and compounds.
Water, Common salt, Sugar, Carbon dioxide, Iodine and Lithium
Match the following.
| Atom | Building block of matter |
| Element | Atoms of different kinds |
| Compound | Atoms of the same kind |
| Molecule | Smallest unit of a substance |
