A Level Chemistry B OCR
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103 topics in 11 modules
☑️ Practical Skills 5 topics
- Planning Experiments
- Practical Techniques
- Presenting Results
- Analysing Results
- Evaluating Experiments
☑️ Elements of Life 17 topics
- The Atom
- Atomic Models
- Relative Mass
- The Mole and Equations
- Empirical and Molecular Formulas
- Titrations
- Titration Calculations
- Electronic Structure
- Ionic Bonding
- Covalent Bonding
- Giant Covalent and Metallic Structures
- Shapes of Molecules
- Periodic Trends
- Group 2
- Making Salts
- Tests for Ions
- Atomic Spectra and Nuclear Radiation
☑️ Developing Fuels 9 topics
- Gas Volumes
- Enthalpy Changes
- Hess's Law
- Catalysts
- Organic Groups
- Shapes of Organic Molecules
- Isomerism
- Addition Reactions of Alkenes
- Fuels
☑️ Elements from the Sea 8 topics
- Electrolysis
- Production of Halogens
- Oxidation States
- Redox Reactions
- Iodine-Sodium Thiosulfate Titrations
- Group 7 - The Halogens
- The Halogens and Atom Economy
- Equilibrium
☑️ The Ozone Story 6 topics
- Electronegativity
- Intermolecular Bonds
- Hydrogen Bonding
- Reaction Rates
- Haloalkanes
- The Atmosphere
☑️ Medicine 7 topics
- Organic Compounds
- Reactions of Alcohols
- Phenols
- Practical Techniques
- Thin Layer Chromatography
- Analytical Techniques
- Green Chemistry
☑️ The Chemical Industry 9 topics
- Rates of Reaction
- Orders and Rate Equations
- Half-Life
- Rate Equations
- The Rate Constant and the Arrhenius Equation
- Rates and Reaction Mechanisms
- Rates, Equilibria and the Chemical Industry
- Equilibrium Constants
- Nitrogen Chemistry
☑️ Polymers and Life 14 topics
- Amino Acids and Proteins
- DNA and RNA
- Protein Synthesis
- Enzymes
- Medicines
- Optical Isomers
- Organic Functional Groups
- Amines
- Amides
- Carboxylic Acids, Esters and Acyl Chlorides
- Polymers
- Nylons
- Mass Spectrometry
- NMR Spectroscopy
☑️ Oceans 8 topics
- Solubility
- Enthalpies and Dissolving
- Entropy
- Solubility Product
- Acids and Bases
- pH Calculations
- Buffers
- The Greenhouse Effect
☑️ Developing Metals 10 topics
- Redox Reactions
- Redox Titrations
- Electrochemical Cells
- Electrode Potentials
- Rusting
- Transition Metals
- Complex Ions
- Metal Complexes and Colour
- Transition Metal Catalysts
- Colorimetry and Visible Spectroscopy
☑️ Colour by Design 10 topics
- Benzene
- Reactions of Aromatic Compounds
- Dyes
- Colour
- Carbonyl Compounds
- Polyfunctional Molecules
- Organic Reactions
- Organic Synthesis
- Fats and Oils
- Gas-Liquid Chromatography
A Level Chemistry B OCR Revision Content
Take a look at the written content available for this course. Practice-question availability may vary.
A Level Chemistry B OCR - Practical Skills - Planning Experiments Content Preview
Practical Skills
Planning Experiments
Objective and Hypothesis
- Clearly define the aim or objective of your experiment. This should be a concise statement of what you hope to find out or achieve.
- Formulate a hypothesis based on your knowledge and understanding of the topic. This is a prediction of the outcome of the experiment.
Experimental Design
- Consider the variables in your experiment that you will control, measure or change.
- Independent variables are the factors you will deliberately change or control.
- Dependent variables are the factors you measure or observe.
- Any other factors that may affect the outcome should be kept constant or monitored as controlled variables.
- Devise a method to effectively control your variables and produce meaningful data.
Materials and Equipment
- List all the materials and equipment you will need to conduct the experiment.
- Select suitable measurement apparatus for your experiment (e.g., pipettes for accurate liquid measures, burettes for titration).
- Describe how you will set up and use the equipment.
Safety Precautions
- Consider the potential hazards associated with your experiment, and outline how you will manage these safely.
- Use appropriate personal protective equipment (such as goggles and lab coats), and follow all safety guidelines while conducting the experiment.
- Ensure correct disposal of waste materials produced during the experiment.
Data Collection Plan
- Plan how you will collect and record data from the experiment. This may involve tables, charts, or computer software.
- Design your data collection method to reduce the potential for errors or bias.
- Include ways to repeat measurements or replicate the experiment in order to validate your results.
Experimental Procedure
- Detail the step-by-step procedure you will follow to carry out the experiment.
- Consider whether a pilot test might be useful to identify any potential issues before the main experiment.
- Plan to document any observations or unexpected events during the experiment.
An effective experimental plan will provide a solid basis for your practical work, making your conduct of the experiment more efficient and your results more reliable.
Question: In the context of planning an experiment, what is the difference between an independent variable and a dependent variable?
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