CLASS XI CHEMISTRY HOLIDAY HOME WORK 2016

WRITING CHEMICAL FORMULAE

1. Give the formulae of the following radicals

a. bicarbonate

b. hydrogen sulphate

c. nitrate

d. phosphate

e.ammonium ion

f. lead ion

g. silver ion

h. nitrite

i. carbonate

j. magnesium ion

2. Write all the possible formulae of the compounds in the above question and write their names?

3. Convert the following into equations and balance them;

a. magnesium ribbon burns in air to give magnesium oxide

b. lead nitrate on heating decomposes to give lead oxide, nitrogen dioxide and oxygen

c. ethane burns in oxygen to evolve carbon di oxide gas and water vapour

d. iron displaces copper sulphate solution to give ferrous sulphate and copper

e. aqueous barium chloride react with aqueous sodium sulphate to give aqueous sodium choloride and precipitate of barium sulphate.

f. hydrogen sulphide gas combines with sulphur di oxide gas to give water and sulphur.

4. Calculate the molar masses of the following:

a. aluminium chloride

b. potassiumcarbonate

c. bariumsulphate

d.ammoniumhydrogencarbonate

e. butane

f.ethanoic acid

g. ethanol

h. calcium phosphate

i. lithiumbromide

j. sodiumoxide.

5. Calculate the number moles in

a. 0.56 mg of iron

b. 3.55 g chlorine

c. 3.01 x 10 23 atoms of helium

d. 0.32 g oxygen

e. 1.06 mg sodium carbonate

6. round of the following to three significant figures

a. 23.456

b.0.01238

c.15483

d.1.546487

e.01.157962

f.0.0045738

g.1.000456

h.456721.

7. Express the above in scientific notation?

8. Define

a. amu

b. gram molar mass

9. State the following laws

a. Gay Lussac's of combining volumes

b. Avagadro's law

c. Law of definite proportions

d. Law of multiple proportion

10. Give multiples for the following pico, femto, giga , tera, mega, nano , deci, deca, milli.