Distinguish between the followios vh7/9ykpx *s-k5 pang terms:
1.Precision and accuracy.
2.Systematic error and random error.

  A student conducted a titration experimentjzvv+f(,p hsf2+0p fz3h ; toc. However, instead of rinsing his apparatus with distilled water, he rinses them with tap water only. Wh fo+vh zsvzp,p;(tffjch0+3 2at is likely the type of error?

A student is determining the7 gvu0jfh,y5d(dtdzvu t u( -bc6ab;( rate of the reaction between $MgCO_3$ and HCl. List 3 sources of random errors.

  The diameter of a cylindrical sample was measured using a vernk(b9, )3iqgz rqbr5rbier caliper at three different points along the sample. The diameters measured were: 13.50 mm, 13.51 mm, 13.50 mm. The true di izq)g9,k( r3rb5bqbrameter of the sample is 12.14 mm. What is the likely type of error, and how can the error be reduced?

  The enthalpy of neut-aqp/rv6fvja; signr u32 c,. ralization for the reaction between sulfuric acid and potassium hydroxide can be determined experimentalrngv .;uj,3a 6- fv2cr pi/sqaly.
$H_2SO_4$(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?