OCR Chemistry B _Salters'_ by malj


									OCR Chemistry B (Salters’)

   Chemistry in Practice

         Andrew Jones
      Principal Moderator
• Skill I     Competence               12 marks

• Skill II    Measurement              12 marks

• Skill III   Analysis & Evaluation    12 marks

• Skill IV    Observation              12 marks

• Skill V     Interpretation           12 marks

                               TOTAL   60 marks
               Skill I Competence
• This Skill assesses the ability of Candidates to
  carry out practical work.

• It is based upon performance throughout the year.

• There are three strands of competence:

  -   safe working;

  -   manipulative skills, including resolving problems;

  -   organisation.
• You must cover all six types of practical activity
  (21 opportunities as part of the course).

• Use the OCR Mark Descriptors (see Practical
  Skills Handbook).

• Choose the ‘best-fit’ mark for each activity type.

• Use the pro-forma available on Interchange as an
  ‘aide-mémoire’ – can use words or numbers (this
  represents best practice).

• Review the process at the end of the first term to
  provide a ‘working mark’ - complete assessment in
  April (needs to reach moderator by 15th May).
• The six types of practical activity are:

  -   performing a titration;

  -   making thermochemical measurements;

  -   qualitative test-tube experiments;

  -   experiments involving ICT;

  -   preparing an organic compound;

  -   collaborating with other students.
     Titration   Thermo-    Qualitative   ICT   Organic prep   Collaborative

EL      1.2                     4.1       1.3

DF                 2.1                    2.2       4.4

ES      4.1                     2.2       4.4       6.3             4.1
        5.1                     4.4

A       3.2                     9.1       6.2                       3.3

PR                              2.1                 4.3
          Skills II, III, IV and V
• OCR provide:
  - Tasks for Candidates;
  - Mark Schemes for Teachers;
  - Instructions for Teachers and Technicians.

• The Tasks are taken under controlled conditions –
  they cannot be taken away.

• Candidates cannot use books or notes – they are
  only permitted the Data Sheet.
• A Candidate cannot modify answers after that
  Task has been completed.

• A Candidate cannot repeat the same Task, but can
  do a different Task to assess the same Skill.

  In this case the best mark is used for the Skill.

• Candidates should not take a Task until they have
  had opportunity to develop the necessary skills.

• When complete mark strictly according to the OCR
  Mark Scheme.
• Skills II and III may be coupled assessments from
  the same Task, partially coupled, or completely

• Skills IV and V also may be coupled, partially
  coupled or decoupled.

• There will always be three choices of Task for each
  Skill per year.
           Skill II (Measurement)
• Examples here include various types of volumetric
  analysis and thermochemical experiments.

• Assessment is made of the ability to:

  -   make measurements and to record data;

  -   work accurately when compared to a teacher
      Skill III (Analysis and Evaluation)
• Assessment is made of the ability to:

  -   carry out a calculation from given data;

  -   calculate percentage uncertainty associated
      with measurement;

  -   comment upon the limitations of practical
            Skill IV (Observation)
• Examples here include observing test-tube
  reactions from Group II, Group VII, Organics.

• Assessment is made of the ability to:

  -   make and record accurate observations.
            Skill V (Interpretation)
• Assessment is made of the ability to:

  -   identify patters or trends in reactions;

  -   identify types of reactions;

  -   write equations (including ionic) for reactions.
• Centres will be required to submit marks to OCR on an MS1
  or electronic equivalent.

• OCR will request a sample of work to include marked Tasks
  for Skills II, III, IV, and V to be sent to a named

• Also sent to the moderator will be:

  -   the mark for Skill I (+ supporting documents);

  -   the Centre Authentication Form (CCS160);

  -   the marks summary spreadsheet.

To top