IB Question answers

1)D
2)A
3)D
4)B
5)C
6)B
7)C

11)a) To measure the rate of reaction, you can measure the mass of the reactants against time, measure the volume of carbon dioxide produced against time and measure the pH of the solution against time.

    


b)To increase the rate of reaction, you can increase the temperature which provides particles with more kinetic energy than the activation energy so the collision frequency increases. Using a catalyst provides an alternative route with a lower activation energy thus the rate of reaction increases. Lastly, increasing the concentration of the acid would speed up the reaction because there would be a higher collision frequency.

c)i)The volume produced stays the same because the lumps of magnesium are already in excess thus there is no effect on the reaction.

ii) The volume produced stays the same when temperature is increased because temperature increases the rate of reaction but the concentrations stay the same.