PHYSICAL SCIENCES GRADE 12 PAPER 2 ERRATA - NSC PAST PAPERS AND MEMOS SEPTEMBER 2017

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PHYSICAL SCIENCES
GRADE 12
PAPER 2 
NSC PAST PAPERS AND MEMOS
SEPTEMBER 2017

The Physical Sciences P2 Grade 12 September was written on Monday, 06 September 2017. During the course of marking a number of corrections and additions that needed to be  affected was brought to our attention. In order to ensure that a standardised approach to  marking is adopted across the Province and ensure that learners are not disadvantaged the  examiner and moderator were asked to prepare an errata which should address all the  concerns raised. 

ERRATA  

QUEST. 

    

MARKS

4.2.2 

Bonds shifted during the printing  process with regard to the table – candidates will not be able to  answer 4.2.2.

Mark out of 149 and scale up to 150

  
       

4.2.3 

24 dm3 used for Vm in place of  22.4 dm3

n(O2) = V/Vm = 96/22.4 = 4.29 mol
n(C6H14) = 2/19 x 4.29 = 0.45 mol
Net energy released= 0.45 × – 4 163 
= - 1 873.35 kJ

  
       

7.2.3 

Concentration used is 0.2  mol.dm-3 in place of 0.1 mol.dm-3

n = cV = 0.1 x 20/1000 
= 0.002 mol (2 x 10-3 mol) 
Positive marking from 7.2.2

  
       

7.2.4 

  

n(H2X) = ½ x (0.002) = 0.001 mol
c(H2X) = n/V = 0.001/(40/1000)
=  0.025 mol.dm-3 
pH = - log[H3O+] = - log(0.025) = 1.6
POSITIVE MARKING FROM 7.2.3

  
Last modified on Monday, 26 July 2021 08:50
Published in 2017 September Grade 12 Trial Examinations

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