Higher Chemistry Ionic / Covalent Bonding

Higher Chemistry Ionic / Covalent Bonding .

1 : Which of A - E describes a property of an 5: Which of the following is a substance ionic compound ? which can dissolve in water?

A: It will dissolve in hexane. A: Sodium chloride. B: Silicon dioxide. B: It will conduct when solid. Graphite. C: It has weak forces of attraction between its C: molecules. Iodine. D: D: It will be crystalline. Hydrogen. E: It is usually a liquid or a gas at room temp. E:

6: Which of the following, when liquid, will release hydrogen at 2: Which of the following compounds has the the positive electrode during greatest degree of ionic bonding? electrolysis?

A: Sodium chloride . A: Lithium hydride. B: Potassium fluoride. B: Hydrochloric acid. C: Caesium fluoride. C: Water. D: Lithium sulphide. D: Hydrogen fluoride. E: Magnesium bromide. E: Methane.

3: Which of the following is a covalent compound ? 7: Which of the following has the highest melting point ? A: Ammonia (NH ) 3 A: Silicon dioxide B: Magnesium oxide. B: Carbon dioxide. C: Sodium chloride. C: Sulphur dioxide. D: Barium fluoride. D: Nitrogen dioxide. E: Copper (II) sulphate. E: Water

4: Which of the following explains why molten lithium fluoride can conduct 8: Which of the electricity? following materials, being very hard, would make a good abrasive? A: Free electrons can carry electricity in Glucose. the molten salt. A: B: Lithium, being metallic, can Sodium chloride. conduct electricity. B: Phosphorus chloride. C: The fluoride ions can pass an electron C: directly to the lithium ions in the molten Silicon carbide. salt. D: Hydrogen bromide. D: Fluorine being non-metallic can E: conduct electricity. E: The ions in lithium fluoride are free to move Higher Chemistry Ionic / Covalent Bonding . Which of the following is a giant C: Water. 9: molecule? D: Silicon dioxide. A: Ammonia . E: Magnesium oxide. B: Hydrogen fluoride.