Higher Chemistry Unit 1 Section 1 Reaction Rates Multiple Choice Questions This is designed to be used by teachers to help students develop skills in answering multiple choice questions.

Higher Chemistry Unit 2 - Section 1 Fuels Multiple Choice Questions 1.Excess marble chips (calcium carbonate) were added to 25cm3 of hydrochloric acid, concentration 2 moll-1. Which measurement, taken at regular intervals and plotted against time, would give the graph shown? A. temperature B. volume of gas produced C. pH of solution D. mass of the beaker and contents Answer D.

Higher Chemistry Unit 2 - Section 1 Fuels Multiple Choice Questions 2. The same reaction was carried out at four different temperatures and the times taken for the reaction recorded. Temperature /oC Time / s The results show that A. a small rise in temperature results in a large increase in reaction rate B. the activation energy increases with increasing temperature C. the rate of the reaction is directly proportional to the temperature D. the reaction is endothermic Answer A.

Higher Chemistry Unit 2 - Section 1 Fuels Multiple Choice Questions 3. In area X A. molecules always form an activated complex B. no molecules have the energy to form an activated complex C. collisions between molecules are always successful in forming products D. all molecules have the energy to form an activated complex Answer D.

Higher Chemistry Unit 2 - Section 1 Fuels Multiple Choice Questions 4.Excess zinc was added to 100cm3 of hydrochloric acid, concentration 1 moll-1 Graph I refers to this reaction. Graph II could be for A. excess zinc reacting with 100cm3 hydrochloric acid, concentration 2 moll-1 B. excess zinc reacting with 100cm3 of sulphuric acid, concentration 1 moll-1 C. excess zinc reacting with 100cm3 of ethanoic acid, concentration 1 moll-1 D. excess magnesium reacting with 100cm3 of hydrochloric acid, concentration 1 moll-1 Answer D.

Higher Chemistry Unit 2 - Section 1 Fuels Multiple Choice Questions 5. When copper carbonate reacts with excess acid, carbon dioxide is produced. The curves shown were obtained under different conditions. The change P to Q could be brought about by A. increasing the concentration of the acid B. decreasing the mass of copper carbonate C. decreasing the particle size of the copper carbonate D. adding a catalyst Answer B.

Higher Chemistry Unit 2 - Section 1 Fuels Multiple Choice Questions 6. The continuous use of large extractor fans greatly reduces the possibility of an explosion in a flour mill because A. A build up in the concentration of oxygen is prevented B. Local temperature rises a prevented by the movement of air C. Particles of flour suspended in the air are removed D. The slow accumulation of carbon monoxide is prevented Answer C.