SS 2 CHEMISRY THIRM TERM

Which of the following process does not take place in domestic water treatment?

• A. Chlorination

• B. Flocculation

• C. Neutralization

• D. Sedimentation

Water is said to be temporarily hard when it contains

• A. Ca (HCO₃)₂ and Mg (HCO₃)₂ salts

• B. Ca (HCO₃)₂ and CaCO₃ SALTS

• C. Mg(HCO₃)₂ and CaSO₄ salts

• D. CaSO₄ and Ca(HCO₃)₂ salts

emporary hardness is removed by?
a) Ca(OH) b) NaOH c) Na2CO3 d) CaCO3?

1. A substance that turns white anhydrous CuSO₄ blue is A. water B.liquid ammonia C. hydrochloric acid D. molten sulphur

1. Distilled water is different from deionized water because A. distilled water is a product of condensed steam while deionized water is filtered laboratory water B. distilled water is always pure and sold in packs while deionized is not packaged for consumption C. distilled water is condensed steam but deionized water is produced using ion-exchange resins which absorbs undesired ions. D. distilled water is man-made while deionized water is both natural and artificial

In a saturated solution at a given temperature, the undissolved solutes are in equilibrium with

• A. the solvent

• B. dissolved solute particles

• C. the saturated solution

• D. insoluble solute particles

1. A graph of solubility against temperature is called a. sigmoid curve

b. supernant curve c. solubility curve d. dispersion curve

• The solubility of alcohols in water is due to a. their covalent nature b. hydrogen bonding c. their low boiling point d. their ionic character

1. Amount of a substance is expressed in a. mole b. grams c. kilograms d. mass

1.       Define the following:

          (a) Solubility (b) Saturated solution (c) Unsaturated solution

1. Determine the mass of CO₂ produced by burning 104g of ethyne [C₂H₂]a. 256g b.352g c. 416g d. 512g