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प्रश्न
Explain the terms ‘chemical formula’.
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उत्तर १
Chemical formula is a representation of a substance either element or compound by means of symbols.
उत्तर २
Chemical Formula: “A molecule of a substance element or compound could be represented by symbols. Representation known as chemical formula i.e. molecular formula of oxygen gas is O2 water H2O, hydrochloric acid HCl etc.
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संबंधित प्रश्न
Write the names and symbols of the first twenty elements that you have studied in class VI & VII.
Give two examples of the following :
Solid + Solid mixture
A student wants to have 3.011 × 1023 atoms each of magnesium and carbon elements. For this purpose, he will have to weigh :
Give two examples of the following:
Solid + Liquid mixture
Give a reason why elements are tabulated in a table called the ‘Periodic table’.
For writing a chemical formula – ‘symbols’ and combining capacity of an element with hydrogen i.e. ‘valency’ should be known. Explain the term – combining the capacity of an element i.e. valency.
Select the correct answer from the choice given below.
The symbol of mercury is
State the type of element for the following:
Chlorine
State the type of element for the following:
Aluminium
Give the symbol of the following element:
Sulphite
Write the radical of the following valency:
Aluminium
Write the radical of the following valency:
Calcium
Write the radical of the following valency:
Phosphate
Write the chemical formula of the following:
calcium sulphide
Give the formula of the following acid:
Sulphuric
Give the formula of the following gas:
Nitrous oxide
Give a reason – Magnesium [2, 8, 2] has valency 2+.
State the valency of the following metallic element and write symbol with the valency
Potassium
Give the qualitative and quantitative meaning of the term ‘symbol’.
What does the symbol '→' present in a chemical equation, mean?
