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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
Define: Elements-
Give the names and symbols of five familiar substances which you think are elements.
Match the formulas of the following of acids with their correct names:
Acids – (a) HCI (b) HNO3 (c) H2SO4 (d) H2CO3
Names – (1) Carbonic acid (2) Sulphuric acid (3) Hydrochloric acid (4) Nitric acid
Elements are mainly classified into metals and non-metals. State six properties of metals which differ from non-metals.
Give the symbol of the following element:
Sulphur [sulphide]
Give the symbol of the following element:
Copper
State the type of element for the following:
Sulphur
State the type of element for the following:
Chlorine
State the type of element for the following:
Radon
Write the radical of the following valency:
Aluminium
Write the radical of the following valency:
Zinc
Write the radical of the following valency:
Carbonate
Write the chemical formula of the following:
magnesium oxide
Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Tin
write symbol with the variable valency
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Bisulphate
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Sulphate
What does the symbol '→' present in a chemical equation, mean?
What does the symbol '(aq.)' present in a chemical equation, mean?
The pictorial symbol for water given by the alchemists was
What is the significance of the symbol of an element?
