Companion PDF worksheet for Edexcel IGCSE Physics Lecture 5 - Gravity, Weight and Drag. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.18 - Know and use the relationship between weight, mass and gravitational field strength. Specification Point 1.19 - Know that the stopping distance of a vehicle is made up of the sum of the thinking distance and the braking distance. Specification Point 1.20 - Describe the factors affecting vehicle stopping distance, including speed, mass, road condition and reaction time. Specification Point 1.21 - Describe the forces acting on falling objects and explain why falling objects reach a terminal velocity. Complete set of Chapter 1 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 2 - Acceleration. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.6 - Know and use the relationship between acceleration, change in velocity and time taken. Specification Point 1.7 - Plot and explain velocity-time graphs. Specification Point 1.8 - Determine acceleration from the gradient of a velocity−time graph. Specification Point 1.9 - Determine the distance travelled from the area between a velocity-time graph and the time axis. Specification Point 1.10 - Use the relationship between final speed, initial speed, acceleration and distance moved. Complete set of Chapter 1 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 4 - Balanced and Unbalanced Forces. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.15 - Calculate the resultant force of forces that act along a line. Specification Point 1.16 - Know that friction is a force that opposes motion. Specification Point 1.17 - Know and use the relationship between unbalanced force, mass and acceleration. Complete set of Chapter 1 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 3 - Forces. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.11 - Describe the effects of forces between bodies such as changes in speed, shape or direction. Specification Point 1.12 - Identify different types of force such as gravitational or electrostatic. Specification Point 1.13 - Understand how vector quantities differ from scalar quantities. Specification Point 1.14 - Understand that force is a vector quantity. Complete set of Chapter 1 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 9 - Formulae and Calculations. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.25 - Understand how to write word equations and balanced chemical equations (including state symbols). Specification Point 1.26 - Calculate relative formula masses (including relative molecular masses) from relative atomic masses. Specification Point 1.27 - Know that the mole is the unit for the amount of a substance. Specification Point 1.28 - Understand how to carry out calculations involving amount of substance, relative atomic mass and relative formula mass. Complete set of Chapter 2 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 24 - Making Salts. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.40C - Describe an experiment to prepare a pure, dry sample of a soluble salt, starting from an acid and alkali. Specification Point 2.41C - Describe an experiment to prepare a pure, dry sample of an insoluble salt, starting from 2 soluble reactants. Specification Point 2.43C - Practical: prepare a sample of pure, dry lead (II) sulphate. Complete set of Chapter 5 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 25 - Chemical Tests. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.44 - Describe tests for these gases: hydrogen, oxygen, carbon dioxide, ammonia and chlorine. Specification Point 2.45 - Describe how to carry out a flame test. Specification Point 2.46 - Know the colours formed in flame tests for the following cations: lithium, sodium, potassium, calcium and copper. Specification Point 2.47 - Describe tests for these cations: ammonium using sodium hydroxide solution and identifying the gas evolved. Copper, iron (II) and iron (III) using sodium hydroxide solution. Specification Point 2.48 - Describe tests for these anions: chloride, bromide and iodide using acidified silver nitrate solution. Sulphates using acidified barium chloride solution and carbonates using hydrochloric acid and identifying the gas evolved. Specification Point 2.49 - Describe a test for the presence of water using anhydrous copper (II) sulphate. Specification Point 2.50 - Describe a physical test to show whether a sample of water is pure. Complete set of Chapter 5 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 28 - Rates of Reaction. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 3.9 - Describe experiments to investigate the effects of changes in surface area of a solid, concentration of a solution, temperature and the use of a catalyst on the rate of a reaction. Specification Point 3.10 - Describe the effects of changes in surface area of a solid, concentration of a solution, pressure of a gas, temperature and the use of a catalyst on the rate of a reaction. Specification Point 3.11 - Explain the effects of changes in surface area of a solid, concentration of a solution, pressure of a gas and temperature on the rate of a reaction in terms of particle collision theory. Specification Point 3.12 - Know that a catalyst is a substance that increases the rate of a reaction, but is chemically unchanged at the end of the reaction. Specification Point 3.13 - Know that a catalyst works by providing an alternative pathway with lower activation energy. Specification Point 3.15 - Practical: investigate the effect of changing the surface area of marble chips and of changing the concentration of hydrochloric acid on the rate of reaction between marble chips and dilute hydrochloric acid. Specification Point 3.16 - Practical: investigate the effect of different solids on the catalytic decomposition of hydrogen peroxide solution. Complete set of Chapter 6 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 34 - Alkanes and Alkenes. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.19 - Know the general formula for alkanes. Specification Point 4.20 - Explain why alkanes are classified as saturated hydrocarbons. Specification Point 4.21 - Understand how to draw the structural and displayed formulae for alkanes with up to five carbon atoms in the molecule, and to name the unbranched-chain isomers. Specification Point 4.22 - Describe the reactions of alkanes with halogens in the presence of ultraviolet radiation, limited to mono-substitution. Specification Point 4.23 - Know that alkenes contain a particular functional group (C=C). Specification Point 4.24 - Know the general formula for alkenes. Specification Point 4.25 - Explain why alkenes are classified as unsaturated hydrocarbons. Specification Point 4.26 - Understand how to draw the structural and displayed formulae for alkenes with up to four carbon atoms in the molecule, and name the unbranched-chain isomers. Specification Point 4.27 -Describe the reactions of alkenes with bromine to produce dibromoalkanes. Specification Point 4.28 - Describe how bromine water can be used to distinguish between an alkane and an alkene. Complete set of Chapter 7 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 36 - Esters. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.38C - Know that esters contain the functional group -COO-. Specification Point 4.39C - Know that ethyl ethanoate is the ester produced when ethanol and ethanoic acid react in the presence of an acid catalyst. Specification Point 4.40C - Understand how to write the structural and displayed formulae of ethyl ethanoate. Specification Point 4.41C - Understand how to write the structural and displayed formulae of an ester, given the name or formula of the alcohol and carboxylic acid from which it is formed and vice versa. Specification Point 4.42C - Know that esters are volatile compounds with distinctive smells and are used as food flavourings and in perfumes. Specification Point 4.43C - Practical: prepare a sample of an ester such as ethyl ethanoate.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 18 - Atmospheric Gases. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.9 - Know the approximate percentages by volume of the four most abundant gases in dry air. Specification Point 2.10 - Understand how to determine the percentage by volume of oxygen in air using experiments involving the reactions of metals and non-metals with air. Specification Point 2.11 - Describe the combustion of elements in oxygen, including magnesium, hydrogen and sulphur. Specification Point 2.12 - Describe the formation of carbon dioxide from the thermal decomposition of metal carbonates, including copper (II) carbonate. Specification Point 2.13 - Know that carbon dioxide is a greenhouse gas and that increasing amounts in the atmosphere may contribute to climate change. Specification Point 2.14 - Practical: determine the approximate percentage by volume of oxygen in air using a metal or a non-metal. Complete set of Chapter 4 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 23 - Acids, Bases and Salts. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.34 - Know the general rules for predicting the solubility of ionic compounds in water. Specification Point 2.35 - Understand acids and bases in terms of proton transfer. Specification Point 2.36 - Understand that an acid is a proton donor and a base is a proton acceptor. Specification Point 2.37 - Describe the reactions of hydrochloric acid, sulfuric acid and nitric acid with metals, bases and metal carbonates to form salts. Specification Point 2.38 - Know that metal oxides, metal hydroxides and ammonia can act as bases, and that alkalis are bases that are soluble in water. Specification Point 2.39 - Describe an experiment to prepare a pure, dry sample of a soluble salt, starting from an insoluble reactant. Specification Point 2.42 - Practical: prepare a sample of pure, dry hydrated copper (II) sulphate crystals starting from copper (II) oxide. Complete set of Chapter 5 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 11 - Concentrations and Volumes. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.34C - Understand how to carry out calculations involving amount of substance, volume and concentration of solution. Specification Point 1.35C - Understand how to carry out calculations involving gas volumes and the molar volume of a gas. Complete set of Chapter 2 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 10 - Formulae and Calculations Part 2. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.29 - Calculate reacting masses using experimental data and chemical equations. Specification Point 1.30 - Calculate percentage yield. Specification Point 1.31 - Understand how the formulae of simple compounds can be obtained experimentally, including metal oxides, water and salts containing water of crystallisation. Specification Point 1.32 - Know what is meant by the terms empirical formula and molecular formula. Specification Point 1.33 - Calculate empirical and molecular formulae from experimental data. Complete set of Chapter 2 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 12 - Ionic Bonding. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.37 - Understand how ions are formed by electron loss or gain. Specification Point 1.38 - Know the charges of several atomic and molecular ions. Specification Point 1.39 - Write formulae for compounds formed between the ions listed in 1.38. Specification Point 1.40 - Draw dot-and-cross diagrams to show the formation of ionic compounds by electron transfer, limited to combinations of elements from groups 1, 2, 3, 5, 6 and 7. Specification Point 1.41 - Understand ionic bonding in terms of electrostatic attractions. Specification Point 1.42 - Understand why compounds with giant ionic lattices have high melting and boiling points. Specification Point 1.43 - Know that ionic compounds do not conduct electricity when solid, but do conduct electricity when molten and in aqueous solution. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 15 - Electrolysis. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.55C - Understand why covalent compounds do not conduct electricity. Specification Point 1.56C - Understand why ionic compounds conduct electricity only when molten or in aqueous solution. Specification Point 1.57C - Know that anion and cation are terms used to refer to negative and positive ions respectively. Specification Point 1.58C - Describe experiments to investigate electrolysis, using inert electrodes, of molten compounds and aqueous solutions and to predict the products. Specification Point 1.59C - Write ionic half-equations representing the reactions at the electrodes during electrolysis and understand why these reactions are classified as oxidation or reduction. Specification Point 1.60C - Practical: investigate the electrolysis of aqueous solutions. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 14 - Metallic Bonding. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.52C - Know how to represent a metallic lattice by a 2-D diagram. Specification Point 1.53C - Understand metallic bonding in terms of electrostatic attractions. Specification Point 1.54C - Explain typical physical properties of metals, including electrical conductivity and malleability. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 20 - The Uses of Metals. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.22C - Know that most metals are extracted from ores found in the Earth’s crust and that unreactive metals are often found as the uncombined element. Specification Point 2.23C - Explain how the method of extraction of a metal is related to its position in the reactivity series, illustrated by carbon extraction for iron and electrolysis for aluminium. Specification Point 2.24C - Be able to comment on a metal extraction process, given appropriate information. Specification Point 2.25C - Explain the uses of aluminium, copper, iron and steel in terms of their properties. Specification Point 2.26C - Know that an alloy is a mixture of a metal and one or more elements, usually other metals or carbon. Specification Point 2.27C - Explain why alloys are harder than pure metals. Complete set of Chapter 4 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 32 - Crude Oil. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.7 - Know that crude oil is a mixture of hydrocarbons. Specification Point 4.8 - Describe how the industrial process of fractional distillation separates crude oil into fractions. Specification Point 4.9 - Know the names and uses of the main fractions obtained from crude oil. Specification Point 4.10 - Know the trend in colour, boiling point and viscosity of the main fractions.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 27 - Bond Energies. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 3.5C - Draw and explain energy level diagrams to represent exothermic and endothermic reactions. Specification Point 3.6C - Know that bond-breaking is an endothermic process and that bond-making is an exothermic process. Specification Point 3.7C - Use bond energies to calculate the enthalpy change during a chemical reaction. Complete set of Chapter 6 Worksheets are available.