Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.3.9 - Forensic psychology. Offender profiling: the top-down approach, including organised and disorganised types of offender; the bottom-up approach, including investigative psychology; geographical profiling. Complete set of Chapter 16 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.1 - Use the following units: ampere, coulomb, joule , ohm, second, volt and watt. Specification Point 2.2 - Understand how the use of insulation, double insulation, earthing, fuses and circuit breakers protects the device or user in a range of domestic appliances. Specification Point 2.3 - Understand why a current in a resistor results in the electrical transfer of energy and an increase in temperature, and how this can be used in a variety of domestic contexts. Specification Point 2.14 - Know that current is the rate of flow of charge. Complete set of Chapter 2 Lectures are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 38 - Condensation Polymers. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.48C - Know that condensation polymerisation, in which a dicarboxylic acid reacts with a diol, produces a polyester and water. Specification Point 4.49C - Understand how to write the structural and displayed formula of a polyester, showing the repeat unit, given the formulae of the monomers from which it is formed including the reaction of ethanedioic acid and ethanediol. Specification Point 4.50C - Know that some polyesters, known as biopolyesters, are biodegradable. Complete set of Chapter 7 Worksheets are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 8.2 - Know that the universe is a large collection of billions of galaxies, that a galaxy is a large collection of billions of stars and that our solar system is in the Milky Way galaxy. Specification Point 8.3 - Understand why gravitational field strength, g, varies and know that it is different on other planets and the Moon from that on the Earth. Specification Point 8.4 - Explain that gravitational force causes moons to orbit planets, causes the planets to orbit the Sun, causes artificial satellites to orbit the Earth and causes comets to orbit the Sun. Specification Point 8.5 - Describe the differences in the orbits of comets, moons and planets. Specification Point 8.6 - Use the relationship between orbital speed, orbital radius and time period. Complete set of Chapter 8 Lessons are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 13 - Covalent Bonding. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.44 - Know that a covalent bond is formed between atoms by the sharing of a pair of electrons. Specification Point 1.45 - Understand covalent bonds in terms of electrostatic attractions. Specification Point 1.46 - Understand how to use dot-and-cross diagrams to represent covalent bonds in a variety of molecules. Specification Point 1.47 - Explain why substances with a simple molecular structures are gases or liquids, or solids with low melting and boiling points. Specification Point 1.48 - Explain why the melting and boiling points of substances with simple molecular structures increase, in general, with increasing relative molecular mass. Specification Point 1.49 - Explain why substances with giant covalent structures are solids with high melting and boiling points. Specification Point 1.50 - Explain how the structures of diamond, graphite and fullerene influence their physical properties, including electrical conductivity and hardness. Specification Point 1.51 - Know that covalent compounds do not usually conduct electricity. Complete set of Chapter 3 Worksheets are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 2.1 - Use the following units: ampere, coulomb, joule , ohm, second, volt and watt. Specification Point 2.2 - Understand how the use of insulation, double insulation, earthing, fuses and circuit breakers protects the device or user in a range of domestic appliances. Specification Point 2.3 - Understand why a current in a resistor results in the electrical transfer of energy and an increase in temperature, and how this can be used in a variety of domestic contexts. Specification Point 2.14 - Know that current is the rate of flow of charge. Complete set of Chapter 2 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 3.1 - Know that chemical reactions in which heat energy is given out are described as exothermic, and those in which heat energy is taken in are described as endothermic. Specification Point 3.2 - Describe simple calorimetry experiments for reactions such as combustion, displacement, dissolving and neutralisation. Specification Point 3.3 - Calculate the heat energy change from a measured temperature change using the expression Q = mcΔT. Specification Point 3.4 - Calculate the molar enthalpy change (ΔH) from the heat energy change, Q. Specification Point 3.8 - Practical: investigate temperature changes accompanying some of the following types of change: salts dissolving in water, neutralisation reactions, displacement reactions and combustion reactions. Complete set of Chapter 6 Lessons are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 1.11 - Understand how a chromatogram provides information about the composition of a mixture. Specification Point 1.12 - Understand how to use the calculation of Rf values to identify the components of a mixture. Specification Point 1.13 - Practical: understand how a chromatogram provides information about the composition of a mixture. Complete set of Chapter 1 Lectures are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 11 - Circuits Part 1. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.7 - Explain why a series or parallel circuit is more appropriate for particular applications, including domestic lighting. Specification Point 2.8 - Understand how the current in a series circuit depends on the applied voltage and the number and nature of other components. Specification Point 2.9 - Describe how current varies with voltage in wires, resistors, metal filament lamps and diodes, and how to investigate this experimentally. Specification Point 2.10 - Describe the qualitative effect of changing resistance on the current in a circuit. Specification Point 2.11 - Describe the qualitative variation of resistance of light-dependent resistors (LDRs) with illumination and thermistors with temperature. Specification Point 2.12 - Know that lamps and LEDs can be used to indicate the presence of a current in a circuit. Specification Point 2.13 - Know and use the relationship between voltage, current and resistance. Complete set of Chapter 2 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 18 - Energy. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.1 - Use a variety of energy units. Specification Point 4.2 - Describe energy transfers involving energy stores. Specification Point 4.3 - Use the principle of conservation of energy. Specification Point 4.4 - Know and use the relationship between efficiency, useful energy output and total energy output. Specification Point 4.5 - Describe a variety of everyday and scientific devices and situations, explaining the transfer of the input energy in terms of the above relationship, including their representation by Sankey diagrams. Complete set of Chapter 4 Worksheets are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 6.1 - Use the following units: ampere (A), volt (V) and watt (W). Specification Point 6.2 - Know that magnets repel and attract other magnets and attract magnetic substances. Specification Point 6.3 - Describe the properties of magnetically hard and soft materials. Specification Point 6.4 - Understand the term magnetic field line. Specification Point 6.5 - Know that magnetism is induced in some materials when they are placed in a magnetic field. Specification Point 6.6 - Practical: investigate the magnetic field pattern for a permanent bar magnet and between two bar magnets. Specification Point 6.7 - Describe how to use two permanent magnets to produce a uniform magnetic field pattern. Complete set of Chapter 6 Lessons are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 9 - Mains Electricity. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.1 - Use the following units: ampere, coulomb, joule , ohm, second, volt and watt. Specification Point 2.2 - Understand how the use of insulation, double insulation, earthing, fuses and circuit breakers protects the device or user in a range of domestic appliances. Specification Point 2.3 - Understand why a current in a resistor results in the electrical transfer of energy and an increase in temperature, and how this can be used in a variety of domestic contexts. Specification Point 2.14 - Know that current is the rate of flow of charge. Complete set of Chapter 2 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 1 - Distance and Speed. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.1 - Understand how to use some common units in physics. Specification Point 1.3 - Plot and explain distance−time graphs. Specification Point 1.4 - Know and use the relationship between average speed, distance moved and time taken. Specification Point 1.5 - Practical: investigate the motion of everyday objects such as toy cars or tennis balls. Complete set of Chapter 1 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 6 - Paper Chromatography. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.11 - Understand how a chromatogram provides information about the composition of a mixture. Specification Point 1.12 - Understand how to use the calculation of Rf values to identify the components of a mixture. Specification Point 1.13 - Practical: understand how a chromatogram provides information about the composition of a mixture. Complete set of Chapter 1 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 31 - Organic Compounds. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.1 - Know that a hydrocarbon is a compound of hydrogen and carbon only. Specification Point 4.2 - Understand how to represent organic molecules using empirical formulae, molecular formulae, general formulae, structural formulae and displayed formulae. Specification Point 4.3 - Know what is meant by the terms homologous series, functional group and isomerism. Specification Point 4.4 - Understand how to name compounds relevant to this specification using the rules of IUPAC nomenclature. Specification Point 4.5 - Understand how to write the possible structural and displayed formulae of an organic molecule given its molecular formula. Specification Point 4.6 - Understand how to classify reactions of organic compounds as substitution, addition and combustion. Complete set of Chapter 7 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 22 - Titrations. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.33C - Describe how to carry out an acid-alkali titration. Complete set of Chapter 5 Worksheets are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 2.7 - Explain why a series or parallel circuit is more appropriate for particular applications, including domestic lighting. Specification Point 2.8 - Understand how the current in a series circuit depends on the applied voltage and the number and nature of other components. Specification Point 2.9 - Describe how current varies with voltage in wires, resistors, metal filament lamps and diodes, and how to investigate this experimentally. Specification Point 2.10 - Describe the qualitative effect of changing resistance on the current in a circuit. Specification Point 2.11 - Describe the qualitative variation of resistance of light-dependent resistors (LDRs) with illumination and thermistors with temperature. Specification Point 2.12 - Know that lamps and LEDs can be used to indicate the presence of a current in a circuit. Specification Point 2.13 - Know and use the relationship between voltage, current and resistance. Complete set of Chapter 2 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 4.1 - Use a variety of energy units. Specification Point 4.2 - Describe energy transfers involving energy stores. Specification Point 4.3 - Use the principle of conservation of energy. Specification Point 4.4 - Know and use the relationship between efficiency, useful energy output and total energy output. Specification Point 4.5 - Describe a variety of everyday and scientific devices and situations, explaining the transfer of the input energy in terms of the above relationship, including their representation by Sankey diagrams. Complete set of Chapter 4 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 1.22 - Practical: investigate how extension varies with applied force for helical springs, metal wires and rubber bands. Specification Point 1.23 - Know that the initial linear region of a force-extension graph is associated with Hooke’s law. Specification Point 1.24 - Describe elastic behaviour as the ability of a material to recover its original shape after the forces causing deformation have been removed. Complete set of Chapter 1 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 3.1 - Use the following units: degree (°), hertz (Hz), metre (m), metre/second (m/s) and second (s). Specification Point 3.2 - Explain the difference between longitudinal and transverse waves. Specification Point 3.3 - Know the definitions of amplitude, wavefront, frequency, wavelength and period of a waves. Specification Point 3.4 - Know that waves transfer energy and information without transferring matter. Specification Point 3.5 - Know and use the relationship between the speed, frequency and wavelength of a wave. Specification Point 3.6 - Use the relationship between frequency and time period. Complete set of Chapter 3 Lessons are available.