Distinguish between the following t/rpa-qi ubaci*6.o5 tql)+w q e0l1 uderms:
1.Precision and accuracy.
2.Systematic error and random error.

  A student conducted a a migur5et.; :titration experiment. However, instead of rinsing his apparatus with distilled r.t :aug 5;eimwater, he rinses them with tap water only. What is likely the type of error?

A student is determining thegqh f4s3thaqv*1*3 w v*bc0k y rate of the reaction between $MgCO_3$ and HCl. List 3 sources of random errors.

  The diameter of a cylindrical sample12rp3t2b mp ht was measured using a vernier caliper at three different points along the sample. The diameters measured were: 13.50 mm, 13.51 mm, 13.50 mm. The true diameter of the sample is 12.14 mm. What is the likely type of error, and how can the errorhpr2213 m bptt be reduced?

  The enthalpy of neutralization for the reacia,w32iofft26 gg u 5ftion between sulfuric acid and potassium hydrwu2f3t6iifa2,og f 5goxide can be determined experimentally.
$H_2SO_4$(aq)+2KOH(aq)→$K_2SO_4$(aq)+2$H_2O$(l)
A student recorded the temperature of 20.0 cm$^3$ of 0.500 mold m$^{-3}$ sulfuric acid every minute. At four minutes,25.0cm$^3$ KOH(aq) is added to the solution, stirred immediately, and temperature recorded for another four minutes. The results are represented in the graph below.



1.Calculate the lowest concentration of aqueous KOH that must be used to ensure it is in excess.
n$_{KOH}$=  mol;C$_{KOH}$=  mold m$^{-3}$
2.Use the graph above to estimate a value for the maximum temperature change, ΔT.
ΔT=  °C
3.State one assumption you made in part (b).
4.Identify the anomalous result and suggest a possible type and source of error.
5.In another experiment with the same reactants, the student measured the initial and final temperatures and presented their results below:
Initial Temperature (°C ± 0.1°C) 24.8 25.1 24.9
Final Temperature (°C ± 0.1°C) 26.4 26.6 26.4
5.1.Calculate the average change in temperature (ΔT) giving its percentage uncertainty.
Average=  °C
5.2.Use sections 1 and 2 of the data booklet to calculate the energy released and its uncertainty. You may assume that the only source of uncertainty is from the temperature change.
Energy released (q)=  J

  25.00 cm$^3$ of 0.100 mold m$^{-3}$$HNO_3$ was titrated against 0.200 mold m$^{-3}$$NaOH$.The volumes of NaOH delivered for the three trials 14.00 cm$^3$ ,14.05 cm$^3$ and 14.00 cm$^3$.
Which statement below best describes these results?