1

Chemistry Practice Questions 1. Which statement about the molecules in solid iodine is correct? A The molecules are triatomic. B The molecules move at high speed. C There are strong covalent bonds between the molecules. D The molecules vibrate about fixed positions. 2. How many electrons does a potassium ion contain? A 18 B 19 C 20 D 21 3. Substance P has the following properties

1 it dissolves in an organic solvent 2 it has a low melting point 3 it does not conduct electricity in any state What is P? A Iron B Tetrachloromethane, CCl4 C Sodium nitrate D Magnesium chloride

4. Sodium carbonate reacts with excess dilute hydrochloric acid to produce carbon dioxide gas. After a while, the production of the gas stops. Why is this so? A All the reactants are used up. B Sodium carbonate is used up. C Dilute hydrochloric acid is used up. D Sodium carbonate contains impurities which stop the reaction. 5. Which two substances react to form a salt and water only? A ammonium nitrate and sodium hydroxide solution B zinc and dilute sulfuric acid C sodium carbonate and dilute hydrochloric acid D sodium hydroxide and dilute hydrochloric acid 6. Which statement about the compounds of Group I of the Periodic Table is correct? A They are simple molecular substances.

2

B They dissolve in an organic solvent. C They conduct electricity when in solid state. D They have high boiling points. 7. Copper and iron are each added to dilute hydrochloric acid. What gas (if any) is produced in each case?

Copper Iron

A No gas Hydrogen gas

B Hydrogen gas Hydrogen gas

C Water vapour Water vapour

D Hydrogen gas No gas

8. The table gives the relative concentrations of polluting gases in the air in four different cities. In which city is photochemical smog most serious?

Unburnt hydrocarbons

Ozone Carbon monoxide

A 10 10 88

B 20 29 90

C 40 48 10

D 49 1 11

9. What product is formed when steam reacts with an alkene?

A An alcohol B An alkane C An organic acid D A polymer

10. The first two carboxylic acids are methanoic acid and ethanoic acid. What is the formula of the next carboxylic acid in the homologous series?

A CH3COOH B C2H5COOH C C3H7COOH D C4H9COOH What are the uses of petrol and bitumen?

Use of petrol Use of bitumen

A To use in car engines To pave roads

B To use in buses To use as a biofuel

C To use in power stations To use as a biofuel

D To use for cooking To pave roads