SS1 REVISION 1ST TERM

A compound contains 7.75% hydrogen, 37.21% carbon and 55.04% chlorine. Determine the empirical formula of the compound. [H=1, C=12, Cl=35.5]

• C₃H₃Cl

• C₂H₅Cl

• C₃H₈Cl

• C₅H₂Cl

The mass number of an element whose atom contains 13 electrons, 13 protons and 14 neutrons is

• 13

• 26

• 27

• 40

The hexagonally arranged planes in graphite are held together by

• covalent

• electrostatic forces

• hydrogen bonds

• van der Waals forces

The number of atoms present in one molecule of ammonium tetraoxosulphate(VI) is

• 6

• 10

• 12

• 15

What is the empirical formula of an oxide of copper containing 4.48g of copper and 1.12g of oxygen? [Cu=64, O=16]

• Cu₂O₃

• Cu₂O

• CuO₂

• CuO

Calculate the percentage by mass of sodium in Sodium trioxonitrate(V)

• 16.5%

• 56.5%

• 27.0%

• 85%

Calculate the mass number of X in the compound XCO₃ if the relative molecular mass is 100

• 100

• 40

• 50

• 60

Which law states that “all pure samples of a particular chemical compound contains similar elements combined in the same proportion by mass”?

• Law of Reciprocal

• Law of Definite proportion

• Law of Multiple proportion

• Law of conservation of mass

The major difference between (i) SO₃ and (ii) SO₃^2- is that

• (i) is a molecule, while (ii) is an atom

• (i) is a radical, while (ii) is a molecule

• (i) is a molecule, while (ii) is a radical

• (i) is a radical while, (ii) is an atom

The numerical coefficients in a balanced equation gives

• The number of moles of reactant and products

• The molar mass of the reactants and products

• The number of moles of reactant only

• The number of molecules and atoms of the product only