O level Chemistry Tuition and Notes by ex-Sec School teacher

1. Choose from the following substances to answer the questions below. Copper(II) sulfate solution, potassium chloride solution, potassium dichromate(VI) solution, potassium iodide solution, magnesium sulfate solution, aqueous ammonia, zinc sulfate solution Each substance can be used once, more than once, or not at all. Name a substance which, (a) reacts with chlorine in a displacement reaction, (b) can be used to test for sulfur dioxide, (c) can oxidize hydrogen peroxide, (d) gives a white precipitate with aqueous sodium hydroxide which dissolves in excess sodium hydroxide to form a colourless solution, (e) is blue in colour, (f) gives a white precipitate with aqueous silver nitrate. Answers: (a) potassium iodide solution (b) potassium dichromate(VI) solution (c) potassium dichromate(VI) solution (d) zinc sulfate solution (e) copper(II) sulfate solution (f) potassium chloride solution 2. Ethanol is a liquid fuel. Ethanol can be manufactured either from glu...

Organic Chemistry 1. When an organic compound W reacts with hydrogen in the presence of a nickel catalyst, propane is formed. What could W be? A propanol B ethane C propene D ethanol 2. When an organic compound X is exposed to air, butanoic acid is formed. What could X be? A butane B ethyl ethanoate C 1-butene D butanol 3. If the substance CH2 = CHCH = CHCH = CH2 was reacted with excess hydrogen in the presence of a catalyst until no further reaction took place, what would be the product? A hexanol B hexane C 1-hexene D propane 4. Warming with acidified potassium manganate(VII) can be used to identify A ethanol B ethanoic acid C ethyl ethanoate D chloroethane 5. Which one of the following compounds hydrolyses to form ethanoic acid? A methyl propanoate B ethyl ethanoate ...

Acids and Bases 1. Which one of the following can be added to lemon juice to increase its pH? A lime juice B baking powder C concentrated hydrochloric acid D ethanoic acid 2. Which one of the following can react with both acids and alkalis? A sulphur dioxide B carbon monoxide C zinc oxide D sodium oxide 3. Which one of the following has the highest pH? Aqueous ammonia is a weak alkali while sodium hydroxide is a strong alkali. A 1.00 mol/dm3 aqueous ammonia B 2.00 mol/dm3 aqueous ammonia C 1.50 mol/dm3 sodium hydroxide D 5.00 mol/dm3 ethanoic acid 4. Which one of the following acids require the largest volume of 1.00 mol/dm3 potassium hydroxide to neutralize? A 1.50 dm3 0.20 mol/dm3 HCl B 1.00 dm3 0.50 mol/dm3 H3PO4 C 1.00 dm3 1.00 mol/dm3 HCl D 1.00 dm3 1.30 mol/dm3 CH3COOH 5. What volume of 1.00 mol/dm3 rubidium hydroxide, RbOH, is required to neutralize 25.0 cm3 of 0.500 mol/dm3 hydrochloric acid? A 12.5 cm3 B 25.0 cm3 C ...

Acids and Bases 1.Which one of the following can be added to lemon juice to increase its pH? A lime juice B baking powder C concentrated hydrochloric acid D ethanoic acid 2.Which one of the following can react with both acids and alkalis? A sulphur dioxide B carbon monoxide C zinc oxide D sodium oxide 3.Which one of the following has the highest pH? A 1.00 mol/dm3 aqueous ammonia B 2.00 mol/dm3 aqueous ammonia C 1.50 mol/dm3 sodium hydroxide D 5.00 mol/dm3 ethanoic acid 4.Which one of the following acids require the largest volume of 1.00 mol/dm3 potassium hydroxide to neutralize? A 1.50 dm3 0.20 mol/dm3 HCl B 1.00 dm3 0.50 mol/dm3 H3PO4 C 1.00 dm3 1.00 mol/dm3 HCl D 1.00 dm3 1.30 mol/dm3 CH3COOH 5.What volume of 1.00 mol/dm3 rubidium hydroxide, RbOH, is required to neutralize 25.0 cm3 of 0.500 mol/dm3 hydrochloric acid? A 12.5 cm3 B 25.0 cm3 C 50.0 cm3 D 100 cm3 6.An element burns in air to form a compound which reacts with both acids and alkali...