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Answers Chapter 12 Worksheet 1-1 Kinetics 4. Colorimeter = an instrument to measure colour intensity and equate it to concentration – you will be building one Cannot do this one yet as you haven’t studied equilibrium. 5. Fe2+(aq) + MnO4-(aq) Versus C2O42-(aq) + MnO4-(aq) Even though the C2O42- ion is at a higher concentration and the reaction is taking place at a higher temperature (both factors usually result in a higher rate of reaction) the reaction takes longer indicating a lower rate of reaction and must be due to the nature of the reactants. Surface area is not a factor as the reactants are all aqueous solutions. No catalyst is indicated. 6. lower 7. [HCl] time -beginning of reaction has a high concentration of HCl -conc of HCl decreases rapidly at first and then tapers off as HCl is used up and fewer collisions take place 8. –the use of the catalyst manganese dioxide to breakdown hydrogen peroxide for the foaming monster demo because it’s fun -in the production of any necessary chemical -the breakdown of NOx gases produced by combustion in your car engine—your car uses solid metal (Pt and Pd) in the catalytic converter to speed up this breakdown so fewer noxious(haha) chemicals are released into the air -Ni metal solid catalyst to turn vegetable oil into margarine (unfortunately you end up with trans fats too) 9. -herbicides and pesticides interfere with the metabolisms of plants and animals -the use of preservatives to slow down the rotting of food caused by chemicals released by bacteria -natural poisons plants and animals release for defense or the killing of prey -antibiotics prevent bacteria from reproducing themselves ↓-lots and lots of drugs man that interfere with metabolic processes 10. -decrease heat energy by the water absorbing heat energy and vaporizing -“blankets the fire to prevent O2 from colliding with the fuel 11. a) r = 0.11 g Zn/s b) r = 0.05 g Zn/s c) ↓ in concentration of HNO3 as the reaction takes place therefore ↓ number of collisions between HNO3 and Zn 12. a)yes bec an increase in the temperature of the HCl will increase the velocity of the reactant particles which will increase the number of collisions AND increase the number of effective collisions i.e. ones that have sufficient energy (activation energy) to react b) skipping this one for now until equilibrium c)yes, bec an increase in the surface area of the iron will increase the number of collisions btw the iron and the HCl 13. a) yes bec an increase in the temperature of the reactants will increase the rate by increasing the number of effective collisions b) no, none of the reactants or products are in a gaseous state and only gases are affected by pressure changes c) yes bec an increase in the concentration of the NaOCl will increase the number of collisions btw the NaOCl particles 14. r = 0.002 mol NO/s