Audio Guides for GCSE and A Level Science
#18 - Atmospheric Gases
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Explore atmospheric gases: air is 78% nitrogen, 21% oxygen, and contains trace gases like argon and carbon dioxide. Combustion and decomposition reactions show oxygen’s role in forming oxides. Carbon dioxide, a greenhouse gas, contributes to climate change by trapping heat in the atmosphere.
#17 - Group 7 Elements
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Explore Group 7 halogens: fluorine, chlorine, bromine and iodine, which decrease in reactivity down the group. They vary in state and color and participate in displacement reactions, where a more reactive halogen displaces a less reactive one from a compound.
#16 - Group 1 Metals
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Discover the alkali metals in Group 1, which react vigorously with water to form alkaline solutions. These soft, low-density metals become more reactive down the group due to weaker attraction between their outer electron and the nucleus.
#15 - Electrolysis
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Explore electrolysis, breaking down ionic substances using electricity. Ionic compounds conduct when molten or dissolved, allowing cations to gain electrons at the cathode and anions to lose electrons at the anode.
#14 - Metallic Bonding
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Understand that metallic bonding involves metals forming lattices of positive ions surrounded by delocalized electrons, explaining their conductivity, malleability, and ductility due to free electrons and sliding ion layers.
#13 - Covalent Bonding
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Learn that covalent bonding involves non-metals sharing electrons. Simple molecules have low melting points, while giant covalent structures like diamond and graphite have high melting points. Most don’t conduct electricity.
#12 - Ionic Bonding
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Understand that ionic bonding involves electron transfer, forming cations and anions. Strong electrostatic forces create stable lattice structures with high melting points, conducting electricity when molten or dissolved but not when solid.
#11 - Concentrations and Volumes
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Learn about concentrations and volumes in chemistry, focusing on solute, solvent, and solution calculations. Measure concentration in moles per dm³ and grams per dm³, and use formula triangles for moles, volume, and concentration.
#10 - Formulae and Calculations Part 2
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Learn advanced chemistry calculations, including reacting masses, percentage yield, and empirical formulas. Calculate product masses from balanced equations, compare theoretical and actual yields, and find empirical formulas through experiments. Understand the relationship between empirical and molecular formulas, and explore water of crystallisation for determining hydration in salts.
#9 - Formulae and Calculations
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Learn the essentials of chemical formulae and calculations: writing balanced equations, calculating relative atomic (Ar) and molecular mass (Mr), and understanding moles. Explore the law of conservation of mass, balance equations, and use state symbols.
#8 - The Periodic Table
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Learn about the periodic table, which organizes elements by atomic number. Understand groups, periods, and their connection to electron configurations. Explore the classification of metals, non-metals, and noble gases, focusing on properties like conductivity and reactivity.
#7 - Atoms and Molecules
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Discover the fundamentals of atoms and molecules, including their structures and properties. Learn about protons, neutrons, and electrons, and how atoms form molecules.
#6 - Paper Chromatography
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Explore paper chromatography, a key method for separating mixtures based on solubility. Learn how chromatograms reveal compositions and Rf values identify substances by comparing solute and solvent distances.
#5 - Methods of Separation
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Explore key methods for separating mixtures: distillation, filtration, crystallization, and chromatography. Learn how these techniques isolate components based on boiling point, solubility, and particle size.
#4 - Elements, Compounds and Mixtures
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Learn to classify substances as elements, compounds, or mixtures. Discover elements with single atoms, compounds with bonded elements, and mixtures as physically combined substances. Understand the unique properties of pure substances and the variable behavior of mixtures.
#3 - Calculating Solubility
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Learn to calculate solubility and interpret solubility curves. Understand factors like temperature and pressure, and measure solubility in grams per 100 grams of solvent. Explore temperature effects on solubility through experiments and master plotting and reading solubility curves.
#2 - Solutions and Solubility
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Discover solutions and solubility: how solutes dissolve in solvents, forming solutions.
#1 - States of Matter
A complete set of concise, modern audio guides for Edexcel IGCSE Chemistry (4CH1).
Edexcel IGCSE Chemistry - The Companion Audio Guide
Discover the basics of the three states of matter: solids, liquids and gases. Understand how particle arrangement, movement and energy define each state and explore key transitions like melting, freezing and evaporation.