Question 17N.3.SL.TZ0.1c.ii
| Date | November 2017 | Marks available | [Maximum mark: 3] | Reference code | 17N.3.SL.TZ0.1c.ii |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Justify | Question number | c.ii | Adapted from | N/A |
In an experiment, data were collected on the variation of specific heat capacity of water with temperature. The graph of the plotted data is shown.
The uncertainty in the values for specific heat capacity is 5%.
Water of mass (100 ± 2) g is heated from (75.0 ± 0.5) °C to (85.0 ± 0.5) °C.
Using an appropriate error calculation, justify the number of significant figures that should be used for your answer to (c)(i).
[3]
percentage uncertainty in ΔT = 10%
«2% + 5% + 10%» = 17%
absolute uncertainty «0.17 × 4.198 =» 0.7 «kJ» therefore 2 sig figs
OR
absolute uncertainty to more than 1 sig fig and consistent final answer
Allow fractional uncertainties in MP1 and MP2
Watch for ECF from (c)(i)
Watch for ECF from MP1
Watch for ECF from MP2
Do not accept an answer without justification
