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.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 30 - Dynamic Equilibria. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 3.19C - Know that a reversible reaction can reach dynamic equilibrium in a sealed container. Specification Point 3.20C - Know that at dynamic equilibrium the forward and reverse reactions occur at the same rate and the concentrations of reactants and products remain constant. Specification Point 3.21C - Understand why a catalyst does not affect the position of equilibrium in a reversible reaction. Specification Point 3.22C - Know the effect of changing either temperature or pressure on the position of equilibrium in a reversible reaction. Complete set of Chapter 6 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 35 - Organic Compounds Part 2. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.29C - Know that alcohols contain the functional group −OH. Specification Point 4.30C - Understand how to draw structural and displayed formulae for methanol, ethanol, propanol and butanol and name each compound. Specification Point 4.31C - Know that how ethanol can be oxidised. Specification Point 4.32C - Know how ethanol can be manufactured. Specification Point 4.33C - Understand the reasons for fermentation, in the absence of air, and at an optimum temperature. Specification Point 4.34C - Know that carboxylic acids contain the functional group -COOH. Specification Point 4.35C - Understand how to draw structural and displayed formulae for unbranched-chain carboxylic acids with up to four carbon atoms in the molecule, and name each compound. Specification Point 4.36C - Describe the reactions of aqueous solutions of carboxylic acids with metals and metal carbonates. Specification Point 4.37C - Know that vinegar is an aqueous solution containing ethanoic acid. Complete set of Chapter 7 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 16 - Group 1 Elements. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.1 - Understand how the similarities in the reactions of the group 1 elements with water provide evidence for their recognition as a family of elements. Specification Point 2.2 - Understand how the differences between the reactions of the alkali metals with air and water provide evidence for the trend in reactivity in group 1. Specification Point 2.3 - Use knowledge of trends in group 1 to predict the properties of other alkali metals. Specification Point 2.4C - Explain the trend in reactivity in group 1 in terms of electronic configurations. Complete set of Chapter 4 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 2 - Solutions and Solubility. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.4 - Understand how the results of experiments involving the dilution of coloured solutions and diffusion of gases can be explained. Specification Point 1.5 - Know what is meant by the terms: solvent, solute, solution and saturated solution. Complete set of Chapter 1 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 5 - Methods of Separation. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.10 Describe the following experimental techniques for the separation of mixtures: Simple distillation. Fractional distillation. Filtration. Crystallisation. Paper chromatography. Complete set of Chapter 1 Worksheets are available.

EdexcelCompanion PDF worksheet for Edexcel IGCSE Chemistry Lecture 4 - Elements, Compounds and Mixtures. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.8 - Understand how to classify a substance as an element, compound or mixture. Specification Point 1.9 - Understand that a pure substance has a fixed melting and boiling point, but that a mixture may melt or boil over a range of temperatures. Complete set of Chapter 1 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 7 - Atoms and Molecules. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.14 - Know what is meant by the terms atom and molecule. Specification Point 1.15 - Know the structure of an atom in terms of the positions, relative masses and relative charges of subatomic particles. Specification Point 1.16 - Know what is meant by the terms atomic number, mass number, isotopes and relative atomic mass (Ar). Complete set of Chapter 2 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 47 - Mutations. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 3.35B - Understand how a change in DNA can affect the phenotype by altering the sequence of amino acids in a protein. Specification Point 3.36B - Understand how most genetic mutations have no effect on the phenotype, some have a small effect and rarely do they have a significant effect. Specification Point 3.37B - Understand that the incidence of mutations can be increased by exposure to ionising radiation (for example, gamma rays, x-rays and ultraviolet rays) and some chemical mutagens (for example, chemicals in tobacco). Complete set of Chapter 5 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 28 - The Kidneys. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.72B - Understand how the kidney carries out its roles of excretion and osmoregulation. Specification Point 2.73B - Describe the structure of the urinary system, including the kidneys, ureters, bladder and urethra. Specification Point 2.74B - Describe the structure of a nephron, including the Bowman’s capsule and glomerulus, convoluted tubules, loop of Henle and collecting duct. Specification Point 2.75B - Describe ultrafiltration in the Bowman’s capsule and the composition of the glomerular filtrate. Specification Point 2.77B - Understand why selective reabsorption of glucose occurs at the proximal convoluted tubule. Specification Point 2.76B - Understand how water is reabsorbed into the blood from the collecting duct. Specification Point 2.78B - Describe the role of ADH in regulating the water content of the blood. Specification Point 2.79B - Understand that urine contains water, urea and ions. Complete set of Chapter 4 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 18 - Gas Exchange in Plants. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.40B - Understand the role of diffusion in gas exchange. Specification Point 2.41B - Understand gas exchange in relation to respiration and photosynthesis. Specification Point 2.42B - Understand how the structure of the leaf is adapted for gas exchange. Specification Point 2.43B - Describe the role of stomata in gas exchange. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 14 - The Digestive System. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.27 - Describe the structure and function of the human alimentary canal, including: the mouth esophagus, stomach, small intestine, large intestine and pancreas. Specification Point 2.28 - Understand how food is moved through the gut by peristalsis. Complete set of Chapter 2 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 25 - The Heart. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.65 - Describe the structure of the heart and how it functions. Specification Point 2.66 - Explain how the heart rate changes during exercise and under the influence of adrenaline. Specification Point 2.67 - Understand how factors may increase the risk of developing coronary heart disease. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 58 - Microorganisms for Food. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 5.5 - Understand the role of yeast in the production of food including bread. Specification Point 5.6 - Practical: investigate the role of anaerobic respiration by yeast in different conditions. Specification Point 5.7 - Understand the role of bacteria (Lactobacillus) in the production of yoghurt. Specification Point 5.8 - Understand the use of an industrial fermenter and explain the need to provide suitable conditions in the fermenter, including aseptic precautions, nutrients, optimum temperature and pH, oxygenation and agitation, for the growth of microorganisms. Complete set of Chapter 7 Worksheets are available.