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📘 Reaction rate is concentration change per time

A reaction rate describes how quickly a measurable amount changes. For a reactant, use the decrease in concentration divided by the elapsed time; for a product, use the increase. The basic average-rate form is change in concentration divide

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. Measure the rateDefine reaction rate and extract labeled concentration-time data.Rate is concentration change over a defensible interval with the correct sign.
  2. Calculate from dataCalculate average and initial rates from tables and graph slopes.Subtract concentrations, divide by elapsed time, and read secant slopes.
  3. Compare and reportCompare intervals, relate species rates with coefficients, and audit the report.Stoichiometry and stated intervals make a rate defensible to another reader.

Questions this course answers

What is the denominator in an average reaction-rate calculation?

Average rate uses concentration change divided by the time interval between the measurements.

Why is a minus sign often used for a reactant rate?

A reactant's final-minus-initial concentration change is negative, so the minus sign reports a positive disappearance rate.

What does the slope of concentration versus time represent?

Slope is change in concentration divided by change in time.

Which interval is normally used for an initial rate?

Initial rate describes the reaction near its start using the earliest reliable measurements.

What must be checked before comparing species rates?

Stoichiometric coefficients connect species rates to a normalized reaction rate.

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