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Chemistry

Chemistry
Aims
A course based on this specification should encourage candidates to:

  • develop their interest in, and enthusiasm for, science
  • develop a critical approach to scientific evidence and methods
  • acquire and apply skills, knowledge and understanding of how science works and its essential role in society
  • acquire scientific skills, knowledge and understanding necessary for progression to further learning.

 

 

6 Assessment Objectives

6.1 The scheme of assessment will require candidates to demonstrate the abilities detailed under assessment objectives below in the context of the subject content in Sections 10–13.

 

 

6.2 Assessment Objective 1 (AO1) Knowledge and understanding of science and how science works

Candidates should be able to:

a) demonstrate knowledge and understanding of the scientific facts, concepts, techniques and terminology in the specification

b) show understanding of how scientific evidence is collected and its relationship with scientific explanations and theories

c) show understanding of how scientific knowledge and ideas change over time and how these changes are validated.

 

 

6.3 Assessment Objective 2 (AO2) Application of skills, knowledge and understanding

Candidates should be able to:

a) apply concepts, develop arguments or draw conclusions related to familiar and unfamiliar situations

b) plan a scientific task, such as a practical procedure, testing an idea, answering a question, or solving a problem

c) show understanding of how decisions about science and technology are made in different situations, including contemporary situations and those raising ethical issues

d) evaluate the impact of scientific developments or processes on individuals, communities or the environment.

 

 

6.4 Assessment Objective 3 (AO3) Practical, enquiry and data handling skills

Candidates should be able to:

a) carry out practical tasks safely and skilfully

b) evaluate the methods they use when collecting first-hand and secondary data

c) analyse and interpret qualitative and quantitative data from different sources

d) consider the validity and reliability of data in presenting and justifying conclusions.

 

 

7 Scheme of Assessment

7.1 Assessment Units The Scheme of Assessment comprises four or five units: Chemistry 1 or (Chemistry 1a and 1b), Chemistry 2, Chemistry 3 and the Chemistry centre-assessed unit.

The objective tests are available as paper-based and from November 2007 as on-screen tests in centres.

 

 

Chemistry 1 Written Paper 45 minutes
25% of the marks 45 marks
The unit comprises a written paper with short answer questions.
The questions assess the subject content in Sections 10 (up to 9 marks) and 11 (at least 36 marks). The paper is available at Foundation and Higher Tier. All questions are compulsory.
Either Chemistry 1 or (Chemistry 1a and Chemistry 1b) should be taken.

 

Chemistry 1a Objective Test 30 minutes
12.5% of the marks 36 marks
The unit comprises an objective test with matching and multiple choice questions. The questions assess the content in Sections 10 (at least 7 marks) and 11a (up to 29 marks). The test is
available at Foundation and Higher Tier. All questions are compulsory.

 

Chemistry 1b Objective Test 30 minutes
12.5% of the marks 36 marks
The unit comprises an objective test with matching and multiple choice questions. The questions assess the content in Sections 10 (at least 7 marks) and 11b (up to 29 marks). The test is
available at Foundation and Higher Tier. All questions are compulsory.

 

Chemistry 2 Written Paper 45 minutes
25% of the marks 45 marks
The unit comprises a written paper with short answer questions. The questions assess the
subject content in Sections 10 (up to 9 marks) and 12 (at least 36 marks). The paper is available at Foundation and Higher Tier. All questions are compulsory.

 

Chemistry 3 Written Paper 45 minutes
25% of the marks 45 marks
The unit comprises a written paper with short answer questions. The questions assess the
subject content in Sections 10 (up to 9 marks) and 13 (at least 36 marks). The paper is available at Foundation and Higher Tier. All questions are compulsory.

 

Chemistry Centre-Assessed Unit
25% of the marks 40 marks
The unit comprises an Investigative Skills Assignment, which is normal class practical work
followed by an externally set, internally assessed test taking 45 minutes, and a Practical Skills Assessment which is a holistic practical skills assessment. The unit assesses parts of the content in Section 10 (these are detailed in Section 17).

 

7.2 Weighting of Assessment Objectives
The approximate relationship between the relative percentage weighting of the Assessment
Objectives (AOs) and the overall Scheme of Assessment is shown in the following table:

 

 

Assessment Objectives

Unit Weightings (%)

Overall Weighting of AOs (%)

Chemistry 1

Chemistry 2

Chemistry 3

Chemistry Centre Assessed Unit

AO1
AO2
AO3

12
13
-

12
13
-

12
13
-

-
5
20

36
44
20

Overall Weighting (%)

25

25

25

25

100

 

8 Summary of Subject Content
8.1 How Science Works

10.1 The thinking behind the doing

10.2 Fundamental ideas

10.3 Observation as a stimulus to investigation

10.4 Designing an investigation

10.5 Making measurements

10.6 Presenting data

10.7 Using data to draw conclusions

10.8 Societal aspects of scientific evidence

10.9 Limitations of scientific evidence

 

8.2 Chemistry 1

 

11.1 How do rocks provide building materials?

 

Chemistry 1a

11.2 How do rocks provide metals and how are metals used?

11.3 How do we get fuels from crude oil?

 

Chemistry 1b

11.4 How are polymers and ethanol made from oil?

11.5 How can plant oils be used?

11.6 What are the changes in the Earth and its atmosphere?

 

 

8.3 Chemistry 2

12.1 How do sub-atomic particles help us to understand the structure of substances?

12.2 How do structures influence the properties and uses of substances?

12.3 How much can we make and how much do we need to use?

12.4 How can we control the rates of chemical reactions?

12.5 Do chemical reactions always release energy?

12.6 How can we use ions in solutions?

 

 

8.4 Chemistry 3

13.1 How was the periodic table developed and how can it help us understand the reactions of elements?

13.2 What are strong and weak acids and alkalis? How can we find the amounts of acids and alkalis in solutions?

13.3 What is in the water we drink?

13.4 How much energy is involved in chemical reactions?

13.5 How do we identify and analyse substances?