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GCSE AQA Higher Combined Science Chemistry · Topic 11 of 11
Topic 11: Key ideas – GCSE AQA Higher Combined Science Chemistry revision notes
Choose a subtopic. Topic 11: Key ideas covers Key ideas in GCSE AQA Higher Combined Science Chemistry. 3 lessons in 1 subtopic.
Revise Topic 11: Key ideas for GCSE AQA Higher Combined Science Chemistry, including Key ideas. 3 lessons across 1 subtopic.
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Key ideas
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Frequently asked questions
What is Topic 11: Key ideas?
Topic 11: Key ideas covers Key ideas in GCSE AQA Higher Combined Science Chemistry. 3 lessons in 1 subtopic.
What is an atom?
An atom is the smallest particle of an element that retains its chemical properties. The Atoms, Elements and the Periodic Table notes cover this in full.
What is the periodic table in GCSE chemistry?
The periodic table is an arrangement of all known elements in order of increasing atomic number, showing repeating patterns in properties. The Atoms, Elements and the Periodic Table notes cover this in full.
What is covalent bonding?
Covalent bonding is the sharing of pairs of electrons between atoms to achieve stable electron configurations, typically between non-metal atoms. The Chemical Bonding and Molecular Shapes notes cover this in full.
What is the difference between exothermic and endothermic reactions?
An exothermic reaction releases energy to the surroundings, so the temperature increases, as in combustion. The Chemical Reactions and Energy notes cover this in full.
What is electron pair repulsion theory?
Electron pair repulsion theory says electron pairs repel each other, so they arrange themselves as far apart as possible in three-dimensional space. The Chemical Bonding and Molecular Shapes notes cover this in full.
What does periodic mean in the periodic table?
Periodic means repeating at regular intervals, like the seasons. The Atoms, Elements and the Periodic Table notes cover this in full.
What are examples of exothermic and endothermic reactions?
Combustion (burning) is an example of an exothermic reaction because it releases energy and heats up the surroundings. The Chemical Reactions and Energy notes cover this in full.
What is an element in chemistry?
An element is a substance made of only one type of atom, which cannot be broken down into simpler substances by chemical means. The Atoms, Elements and the Periodic Table notes cover this in full.