OCR GCSE Chemistry A · J248
Specification CM6.1iv · Paper 2 (Foundation), Paper 4 (Higher)
A number showing how many times as large one value is as another; it is calculated as new value divided by original value for the same quantity.
Revise: Proportionality in RatesConvert them to the same unit before dividing, so that the scale factor has no unit. For example, a rate scale factor of 2 means that the second rate is twice the first; a scale factor of 0.5 means that it has halved. Comparing the two scale factors shows whether rate changes in the same proportion as the chosen factor.