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Transcript
HâI A. B. C. D. 300 +290 +10 â10 â290 (Total 1 mark) 6. Which substance does not conduct electricity? A. B. C. D. Solid zinc Molten zinc Solid zinc chloride Molten zinc chloride (Total 1 mark) 7. 1.0 g of sodium hydroxide, NaOH, was added to 99.0 g of water. The temperature of the solution increased from 18.0 ºC to 20.5 ºC. The specific heat capacity of the solution is 4.18 J gâ1 Kâ1. Which expression gives the heat evolved in kJ molâ1? A. 2.5 ï´100.0 ï´ 4.18 ï´1000 40.0 B. 2.5 ï´100.0 ï´ 4.18 1000ï´ 40.0 C. 2.5 ï´100.0 ï´ 4.18 ï´ 40.0 1000 D. 2.5 ï´1.0 ï´ 4.18 ï´ 40.0 1000 (Total 1 mark) 8. Which is true for a chemical reaction in which the products have a higher enthalpy than the reactants? Reaction âH A. endothermic positive B. endothermic negative C. exothermic positive D. exothermic negative (Total 1 mark) 9. Consider the reaction between magnesium and hydrochloric acid. Which factors will affect the reaction rate? I. The collision frequency of the reactant particles II. The number of reactant particles with E ⥠Ea III. The number of reactant particles that collide with the appropriate geometry A. B. C. D. I and II only I and III only II and III only I, II and III (Total 1 mark) 511 Version 2 2014
