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प्रश्न
Define: Formula
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उत्तर
Formula: Formula is a short way of representing the molecule of an element or a compound
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संबंधित प्रश्न
Classify the following substances into compounds and mixtures:
Define Elements.
Define: Atom
Give reason: A frying pan is made up of steel but its handle is made up of wood.
Fill in the blank
The most abundant element in the earth’s crust is _______.
Indicate whether the following statement is true or false:
Molecules combine to form atoms
With reference to elements – define the term ‘molecule’. Give two examples each of a monoatomic, diatomic & polyatomic molecule.
The diagram represents fractional distillation for the separation of mixtures. Answer the following :
- Can two immiscible liquids be separated by this process?
- Separation of liquids by this process is based on which physical property?
- If methyl alcohol & water are to be separated, which liquid would remain in flask ‘X’ after condensation.
- Give a reason for the above answer.
- State the purpose of the fractionating column in the apparatus.
The first letter of an element is always written in ______ letter.
Give an account of elements known to us.
