Chemistry A-Level
Proportionality
What Proportionality means in Chemistry A-Level, as defined for OCR.
Definition of Proportionality
Check what you remember
Read the wording for your board, then hide it and explain Proportionality in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Rate is directly proportional to concentration for a straight line through the origin, and proportional to the square of the concentration for an upward curve of increasing steepness.
Topics that use Proportionality
- How fast? (OCR A-Level)
Related terms
- Calculating rate and concentration from the rate equation
- Colorimetry
- Concentration–time graphs
- Constant half-life
- continuous monitoring
- Controlled comparison of experiments
- Deducing order from initial-rate data
- Deducing order with respect to a reactant
Using Proportionality in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
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