GCSE Chemistry (Triple) WJEC
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101 topics in 12 modules
☑️ The Nature of Substances and Chemical Reactions 15 topics
- Elements as Substances
- Compounds as Substances
- Representing Elements and Simple Molecules
- Formulae of Ionic Compounds
- Relative Atomic Mass and Relative Molecular (Formula) Mass
- Percentage COmposition of Compounds
- Fitlration, Evaporation, Chromatography and Distillation
- Chromatographic Data ANalysis and Rf Values
- Chemical Reactions
- Colour, Temperature Changes and Effervescence
- Representing Chemical Reactions
- The Percentage Yield
- Calculating the Formula of a Compound from Reacting Mass Data
- Calculating Masses of Reactants or Products from a Balanced Chemical Equation
- The Avogadro Constant
☑️ Atomic Structure and The Periodic Table 9 topics
- Atoms
- Relative Masses and Charges of Protons, Neutrons and Electrons
- Atomic Number, Mass Number, Isotope
- Order of Elements in the Modern Periodic Table
- Electronic Structures of the First 20 Elements
- Group 1 and Group 7
- Alkali Metals
- Chlorine and Iodine
- Group 0
☑️ Water 10 topics
- The Composition of Water
- The Need for Sustanable Water Supply
- Treatment of the Public Water Supply
- FLouridation
- Desalination of Sea Water
- Separation via Distillation
- Solubility and Solubility Curves
- Hardness in Water
- Softening Water
- The Health Benefits of Hard Water
☑️ The Ever-changing Earth 9 topics
- The Large Scale Structure of the Earth
- Plate Tectonics
- Plate Boundaries
- Formation of the Original Atmosphere by Gases
- Present Composition of the Atmosphere
- Roles of Respiration, Combustion and Photosynthesis
- Carbon Dioxide and Sulfur Dioxide Emission Consequences
- Addressing the Global Warming and Acid Rain
- Nitrogen, Oxygen, Neon and Argon
☑️ Rate of Chemical Change 4 topics
- Rate of Reaction
- The Effect of Changes in Temperature, Concentration and Surface Area on Rate of Reaction
- The Particle Theory
- Catalysts
☑️ Limestone 5 topics
- The Trend in Stabilities of Metal Carbonates and their Thermal Decomposition
- Calcium Carbonate, Oxide and Hydroxide
- The Cycle of Reactions involving Limestone and Products Made From it
- The Uses of Limestone in the Production of Iron and Steel, in Road-building
- The Social, Economic and Environmental Benefits and Drawbacks of Limestone Quarrying
☑️ Bonding, Structure and Properties 9 topics
- The Properties of Metals, Ionic Compounds, Covalent Substances
- Ionic Bonding
- The Accepted Structural Model for Giant Ionic Structures
- Forming Covalent Bonds
- Intermolecular Bonding
- Diamond, Graphite, Fullerenes, Carbon Nano-tubes and Graphene
- Individual Atoms not having Same Properties as Bulk Materials
- Nano-scale Particles
- The Properties and Uses of Smart Materials
☑️ Acids, Bases and Salts 7 topics
- pH Scale
- Solutions of Acids
- Reactions of Dilute Acids with Metals
- Neutralisation of Dilute Acids with Bases and Carbonates
- The Acid/Carbonate Reaction
- Preparation of Crystals of Soluble Salts
- TItration
☑️ Metals and their Extraction 9 topics
- Earth's Crust as the Source of Most Metals
- Extracting Unreactive Metals
- Relative Reactivities of Metals
- Reduction and Oxidation
- Industrial Extraction of Iron in the Blast Furnance
- Properties and Uses of Iron, Aluminium, Copper and Titanium
- General Properties of Transition Metals
- Alloys
- Economic Viability and Sustainability of Extraction Processes
☑️ Chemical Reactions and Energy 3 topics
- Exothermic and Endothermic Reactions
- The Activation Energy
- Bond Energy Data
☑️ Crude Oil, Fuels and Organic Chemistry 15 topics
- Crude Oil
- Fractional Distillation of Crude Oil
- Fractions
- Global Economic and Political Importance and Social and Environmental Impact of the Oil Industry
- The Combustion Reactions of Hydrocarbons and other Fuels
- The Combustion Reaction of Hydrogen
- The Fire Triangle in Fire-fighting and Fire Prevention
- Alkanes
- Alkenes
- Addition Polymerisation of Ethene and Other Monomers
- Ethanol
- Potassium Dichromate (VI)
- Names and Molecular and Structural Formulae for Alcohols
- Microbial Oxidation of Ethanol to Ethanoic Acid
- Infrared Spectroscopy
☑️ Reversible Reactions, Industrial Processes and Important Chemicals 6 topics
- Reversible Reactions
- Haber Process
- Ammonia
- The Sulfurid Acid
- Nitrogenous Fertilisers
- The Benefits and Problems of Nitrogenous Fertilisers for Crop Growth
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GCSE Chemistry (Triple) WJEC Revision Content
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GCSE Chemistry (Triple) WJEC - The Nature of Substances and Chemical Reactions - Elements as Substances Content Preview
The Nature of Substances and Chemical Reactions
Elements as Substances
- Elements are pure substances that consist of only one type of atom. They cannot be broken down into simpler substances by chemical means.
- The periodic table lists all the known elements. They are arranged according to their atomic number i.e., the number of protons in an atom of the element.
- Elements are grouped into 'groups' (vertical columns) and 'periods' (horizontal rows). Elements in the same group have similar properties because they have the same number of electrons in their outer shell.
- Elements can be classified as metals, non-metals, and metalloids. Metals are generally shiny, good conductors of heat and electricity, and ductile. Non-metals are generally dull, poor conductors of heat and electricity, and brittle. Metalloids have properties of both metals and non-metals.
- Some elements occur naturally on Earth, while others can only be created in a laboratory.
- Elements can combine with each other to form compounds, which have different properties from the elements that make them up.
- Symbols are used to represent elements. These symbols consist of one or two letters, with the first letter always capitalised.
- Each element has a unique set of properties, including melting point, boiling point, density, reactivity, and atomic structure.
- Isotopes are atoms of the same element that have different numbers of neutrons. Despite this, they have identical chemical properties to other atoms of the same element because chemical properties are determined by the number of electrons, which is the same for all atoms of a given element.
- Elements in Group 1 of the periodic table are called alkali metals and are highly reactive due to the single electron in their outer shell.
- The noble gases are in Group 8 or 0 of the periodic table. These elements are unreactive as they have a full outer shell of electrons.
Question: What distinguishes isotopes of the same element and why does this not affect their chemical properties?
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