Calculating Gradients (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards

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Calculating Gradients
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Gradient of a graph

How steep a line is

Gradient in reaction rate graphs

Shows how quickly the reaction is happening

Purpose of calculating gradient

Determine rate of reaction at a particular moment

Why gradients useful for reactions

Rate of reaction often changes as reaction progresses

Definition of a tangent

Line touching curve at one point, doesn't cross it

Change in amount on graph

Difference between two y-axis points

Change in time on graph

Difference between two x-axis points

Formula for gradient

Change in AmountChange in Time\frac{\text{Change in Amount}}{\text{Change in Time}}

What gradient equals

Rate of reaction at that point

Why use tangents

Measure rate at specific moment, not just average

First step to calculate gradient

Draw a tangent at the point on the curve

Rate if 1010 cm³ change in 22 s

55 cm³/s

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