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GCSE Combined Science · key term
A comparison made by dividing one quantity by another, or expressing their relative sizes using a colon.
Used by OCR
Specification C6.1e, P2.1c, P4.3k, P6.1c · Chemistry Paper 2, Physics Paper 1, Physics Paper 2
A comparison in which dividing one quantity by another shows how many times as large it is.
A comparison made by dividing one quantity by another, or written in the form .
Label the order of a ratio. After three half-lives, remaining activity : initial activity is 1 : 8; the reverse ratio is 8 : 1.
Simplify all the atom counts by the same common factor. The final ratio must contain whole numbers and be in its simplest form.
An empirical formula gives a ratio, not necessarily the actual number of atoms in one molecule. Do not use atomic numbers or relative atomic masses when you are given atom counts.
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A comparison of two quantities by division, written in a stated order, such as remaining activity : initial activity.
Specification M1 · Biology, Chemistry, Physics, Combined Science
A comparison of quantities in a stated order. For example, a carbon-to-hydrogen atom ratio of means twice as many hydrogen atoms as carbon atoms.
Revise: Determining Empirical FormulaeAn empirical formula gives the simplest whole-number ratio of those atoms. It describes their proportions rather than the size of the molecule.
A comparison of two quantities by division, showing their relative sizes.
A comparison of quantities by division, often written using a colon, such as . The order of the quantities matters.
