Practice Questions

1. D-if water is produced it is a neutralisation reaction
2. A
3. D-mol dm-3 time-3
4. B
5. C-catalyst reduces activation energy by taking an alternative route.
6. B
7. C

11. A) measure mass of reactants (g) on top pan balance
            Volume of CO2 produced (cm3),
           pH, measured using pH probe, of solution (time it takes to reach 7)

B) Increase in temperature means increase in average kinetic energy of particles hence more frequent collision. Higher number of particles with average kinetic energy>Ea.

Increase in surface area of MgCO3 hence more particles on the surface for successful collisions.

Adding a catalyst-alternative route provided with lower activation energy hence more particles with average kinetic energy>Ea therefore more collisions.

C) i) Stay the same because MgCO3 is already in excess. HCl is the limiting factor.
    ii) Stay the same because mass of reactants as well as the concentration stays the same. Only reaction takes place faster because higher collision frequency.