GCSE Combined Science (AQA)

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Rate Changes & Graphs

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The rate and extent of chemical change Rate of reaction

Rate Changes & Graphs

7:24 Calculating Reaction Rates using Graphs
Spec 4.6.1.1
Previous Rate Calculations using Moles Next Calculating Rate from Graphs
  • Graphs visualize how the rate of reaction changes over time.
  • Two types of graphs: amount of reactant remaining and amount of product made.
  • X-axis represents time since the start of the reaction.
  • Y-axis represents the amount of reactant used or product formed.
  • Higher graph indicates more reactant left or more product made.
  • Rate can be calculated in units like grams per second or centimeters cubed per second.
  • Steeper line indicates a faster reaction.
  • Reactions are fastest at the start due to more reactant particles.
  • Reaction slows down as reactants are used up, shown by a flattening curve.
  • When the curve flattens completely, the reaction has stopped.
  • Comparing two reactions on one graph: steeper slope means faster reaction.
  • Tangents can be drawn to measure the slope more accurately.
  • Tangent lines help determine the rate of reaction at specific points.
  • Drawing tangents involves using a ruler to touch the curve at the point of interest without cutting through the graph.
  • Transparent rulers can help in drawing accurate tangents.
  • Exam questions will allow some leeway in drawing tangents.

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