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

1. What is the mass of magnesium which completely reacts with 100 cm3 of 0.25 mol/dm3 sulfuric acid? 2. What apparatus can be used to measure 21.5 cm3 of hydrochloric acid accurately? 3. Aqueous silver nitrate is added to an unknown solution P. No precipitate is observed. What ions are absent from P? A chloride B sulfate C nitrate D sodium 4. Name a compound that has both ionic and covalent bonds. 5. Carbon and chlorine can react to form a compound D. State the type of bonding in compound D and the formula of D. 6. The outer shell of an atom of element E contains 5 electrons. (a) To which group of the Periodic Table does E belong? (b) Draw a dot and cross diagram to show the bonding in the compound of E with hydrogen. 7. Dissolving ammonium sulfate in water is an example of A exothermic reaction B endothermic reaction C precipitation reaction D neutralization reaction 8. State the oxidation numbers of iron in FeO and Fe2O3. 9. Chlorine reacts with water to ...

Chemistry Practice Questions 1. Which of the following cannot reduce iron(III) oxide to iron? A Coke B Carbon monoxide C Carbon D Limestone 2. Solid Q is insoluble in water. It gives off a gas when heated and also when treated with dilute sulfuric acid. Identify Q. A Carbon B Zinc oxide C Sulfur D Copper(II) carbonate 3. Which of the following has the most number of electrons? A Calcium ion B Fluorine ion C potassium atom D Chlorine atom 4. Which of the following properties allows water and ethanol to be separated by distillation? A They have different densities. B They have different reactivities. C They have different mass numbers. D They have different boiling points. 5. Which of the following sets consists of elements w...