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Interpreting and sketching rate graphs for reactions

The rate and extent of chemical change • Rate of reaction

Key concepts

What you'll likely be quizzed about

  • The vertical axis displays the quantity of product formed or the quantity of reactant used, while the horizontal axis indicates time.
  • An upward-sloping curve signifies product formation, whereas a downward-sloping curve indicates reactant consumption.
  • Straight-line sections reflect a constant rate, while curved sections demonstrate a changing rate.
  • The curve's steepness at any point reveals the rate of change at that time.

Flashcards

Test your knowledge with interactive flashcards

How does increased pressure for gases affect a rate graph?

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Higher pressure increases particle concentration, elevating the initial slope and overall rate.

Key notes

Important points to keep in mind

Vertical axis: quantity (product formed or reactant used) ; horizontal axis: time.

Steep curve → fast change ; flat curve → slow change.

Product vs. time graphs rise; reactant vs. time graphs fall.

Plateau corresponds to reaction completion or equilibrium.

Tangent at a point yields instantaneous rate; use rise/run to calculate.

Average rate between two times uses a straight line between those points (secant).

State experimental conditions when comparing graphs (concentration, temperature, catalyst, surface area, pressure).

Include correct units for rate: quantity per unit time.

Use early-time slopes for initial rate comparisons.

Draw tangents carefully; pick two clear points on the tangent for slope calculation.

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