Summary:
OCR AS Chemistry gives comprehensive coverage of Units 1 and 2 of the OCR A-level specification. Each chapter explores the relevant specification content and includes a range of examples to equip students with the skills to succeed in the examination.
An important feature of the specification is the inclusion of centre-based practical assessment (Unit 3). A chapter is included to provide a clear discussion of the skills required for tackling this component. An accompanying online resource includes chapter summary worksheets and offers guidance on exam technique and sample exam-style questions, together with graded answers and detailed commentaries.
OCR AS Chemistry includes the following special features:
l examiner’s notes — invaluable content guidance and exam advice
l worked examples — detailed explanations of calculations and exam-type questions
l l stretch-and-challenge — extension topics and questions at the end of each chapter Answers to all review, extension and summary worksheet questions are provided in an accompanying Teacher Answer Guide, which is available for purchase by teachers.

• Comprehensive subject coverage of both units
• A chapter on laboratory chemistry and useful advice on the practical assessments
• Differentiated stretch and challenge material with each chapter
• Packed with questions and worked examples
• Integrated material on ‘how science works’ throughout the text
• Includes ‘mock’ exam papers
• Free online resource with exam-style questions and answers with commentaries
• Invaluable examiner advice
• A2 text to follow
• Written by Mike Smith & John Older, Principal Examiners
• Supporting Teacher Answer Guide provides answers to all the questions with detailed explanations (comprises resource pack plus CD — £49.99)

Table of Contents:
Introduction
Unit 1 Atoms, bonds and groups
Chapter 1 Structure of the atom
Atoms
Isotopes and mass spectra
Electrons
Summary
Chapter 2 Formulae and equations
Formulae
Equations
Ionic equations
Summary
Chapter 3 Relative atomic mass and the mole
Relative atomic mass
The mole
Summary
Chapter 4 Mole calculations
Converting masses to moles and moles to masses
Calculating molar masses
Calculating reacting masses from equations
Volumes of gases
Summary
Chapter 5 Solutions
Concentrations of solutions
Diluting solutions
Titrations
Summary
Chapter 6 Bonding and structure
Background
Ionic bonding
Covalent bonding
Shapes of simple molecules and ions
Metallic bonding
Bond polarity and polarisation
Intermolecular forces
Structure and physical properties
Summary
Chapter 7 Periodicity, group 2 and group 7
The periodic table
Types of reaction
Group 2
Group 7
Summary
Unit 2 Chains, energy and resources
Chapter 8 Basic concepts in organic chemistry
Functional groups
Naming organic compounds
Types of formulae
Isomerism
Bonding in organic compounds
Important terms
Calculations of empirical and molecular formulae, percentage yield and atom economy
Summary
Chapter 9 Fuels, alkanes and alkenes
Hydrocarbons as fuels
Alternative fuels
Alkanes
Alkenes
Summary
Chapter 10 Alcohols, halogenoalkanes and analysis
Alcohols
Halogenoalkanes
Modern analytical techniques
Summary
Chapter 11 Energy
Energetics
Reaction rates
Chemical equilibrium
Summary
Chapter 12 Resources
Infrared absorption and the greenhouse effect
Combustion and pollution
Other environmental factors
Green chemistry
Summary
Unit 3 Practical skills in chemistry 1
Chapter 14 Practical skills
Accuracy of measurements and significant figures
Measurement of mass
Measurement of volume
Measurement of temperature
Recording results
Errors and improvements in experimental procedure
Summary

About the Author(s):
Mike Smith is a Principal Examiner for AS and A-level chemistry and is currently Assistant Principal at Cadbury Sixth Form College. He has written numerous books including five Student Unit Guides for OCR chemistry, also published by Philip Allan Updates.
John Older is a Principal Moderator for AS and A-level chemistry. He was previously Vice Master and former Head of Chemistry at University College School in London.