Few candidates attempted this question. The few that attempted it were not able to get good graphs as a result of poor readings from the set-up.
Many candidates did not record the initial value of the volume V0. Those that did record it to the wrong number of decimal place e.g.

V0 = 10cm3 instead of 10.00cm3. Few other candidates failed to express v-1 to 3d.p or 3s.f.
However, the values of V were well determined.
Part (b) was poorly handled. Many candidates were unable to state correctly the quantity that increase 0,e pressure) and decrease (i.e volume) nor were they able to use kinetic theory to explain what Is responsible for pressure in the vessel.
The expected answers are:
(jj) Initial volume V0 read and recorded correctly to at least 1 d.p in cm3

1. Five values of M correctly recorded in gm
2. Five values of V correctly read and recorded to at least 1 d.p in cm3 and in trend

(Trend: As M increases, V decreases)

1. Five values of V'1 correctly evaluated to at least 3 d.p
2. Composite table showing M, V and V1

Candidates are also expected to:
plot five points on graph distinguish between the axes

1. chose reasonable scales draw line of best fit
2. determine the slope of the graph
3. evaluate k = s 1
4. State any two of the following precautions in acceptable language.
5. Avoided parallax error in reading the syringe
6. Syringe was firmly clamped
7. Repeated readings ( Shown on table)

(b)   (i)       (α) Pressure increases
                     (β) Volume decreases

        (ii)The collision of the molecules of the gas with the walls of the