AQA · Chemistry · 8462
GCSE Chemistry: Atoms, elements and compounds
Atomic structure and the periodic table · AQA GCSE Chemistry (8462), specification point 4.1.1.1. Cards are generated from the exam board's own specification for "Atoms, elements and compounds", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What is an atom?
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The smallest part of an element that can exist.
All substances are made of ?.
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atoms
Approximately how many different elements are there?
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About 100.
Where are all the known elements displayed?
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In the periodic table.
What is the chemical symbol for sodium?
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Na
How are compounds formed from elements?
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By chemical reactions.
Define a compound.
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A substance containing two or more elements chemically combined in fixed proportions.
What do chemical reactions always involve?
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The formation of one or more new substances (and often a detectable energy change).
How can a compound be separated into its elements?
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Only by chemical reactions — not by physical methods.
What two kinds of equation can represent a chemical reaction?
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Word equations, and symbol equations using symbols and formulae.
What is used to write the formula of a compound?
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The chemical symbols of the atoms from which it was formed.
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