Question

what do you meant by the term chemical formula ?

write down the name of compound represented by the following ; in attachment !


which postulate state of Dalton's atomic theory is result of law of conservation of mass


Why is it not possible to see an atom with naked eyes

define the atomic mass unit ​

Answer 1

Answers

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a) the chemical formula of a compound represent the composition of a molecule of the compound in terms of the symbols of the element present in it .

For example - the chemical formula of water is H2O that tells us one molecule of water is made up off two hydrogen atom and one oxygen atom chemically combined together .

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c) The postulate of Dalton's atomic theory which say that atom can neither be created nor be destroyed in chemical reaction is the result of the law of conservation of mass .

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d) it is not possible to see an atom with naked eyes because an atom is very very small particle the radius of an atom is of the order of 10^-10 m which is extremely small .

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e) atomic mass unit is equal to 1/12 (one-twelfth) the mass of carbon 12 atom .

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b)Some compounds is present by the following formula ;

• Al2 (so4)3 = Aluminium Sulphate
• CaCl2 = calcium chloride
• K2SO4 = Potassium Sulphate
• CaCO3 = calcium carbonate
• KNO3 = Potassium Nitrate

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