Edexcel GCSE Chemistry · 1CH0
Specification 7.5 · Paper 2
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GCSE Chemistry · key term
The change in a measured quantity divided by the time taken over a stated interval.
Used by Edexcel and OCR
Specification 7.5 · Paper 2
Specification CM5.2i, CM5.2iii, C5.2b, CM5.3ii · Paper 2 (Foundation), Paper 4 (Higher)
The change in a measured quantity divided by the time interval over which that change occurs.
The change in a measured quantity divided by the time taken for that change.
The rate over a time interval, found from the total change in a measured quantity divided by the time interval.
The change in a measured quantity divided by the time taken over a specified interval.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The change in the measured quantity divided by the time taken over a stated period.
Revise: Calculations for rateIf one run produces 30 cm³ of gas in 20 s and another produces 30 cm³ in 40 s, their mean rates are 1.5 cm³/s and 0.75 cm³/s.
Read values at the two times specified. For a mean rate, divide the change in the measured quantity by the time interval, not by the time shown at the second point.
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