Brainlag PlusGradients, mean rates, rate as 1000 ÷ time, proportional or linear, reading lines of best fit and tangents.
Rates from graphs
mean rate = change in quantity ÷ change in time
rate at one moment = gradient of the tangent (Higher)
A straight line through the origin means directly proportional. A straight line that misses the origin is linear but not proportional.
In the disappearing cross experiment, use 1000 ÷ time as a measure of rate: a shorter time means a faster reaction.
The rest of this lesson and its 9 practice questions are in Plus.
Screen 1 of 2, free to read.
- 9 exam-style questions, marked as you go, each with a worked solution
- The Rates of reaction simulation beside every question
- Anything you get wrong is saved to your flashcards