Preview

Payments are switched off, so the Bench Pass costs nothing yet: 40-row runs, saved runs, lab sheets and CSV are open to everyone.

Prices that will apply
Rate Benchchemical kinetics, worked

A chemical kinetics workbench

Find the rate law.
Show the work.

Paste the readings from your lab or your problem set. Rate Bench fits the integrated rate laws, the initial-rates table and the Arrhenius plot, then shows every number it used, so you can check each step against your own.

Open the order finder See a sample run

Bench Pass
$1.95 a month or $19.50 a year
Exam Week Pass
$1.00 for 7 days

Free during previewCompare the plans

0100200300400500-5-4-3-2t (s)ln [A]
Fig. 1 ln [A] against t for the sample run is the straightest of the three plots (R2 = 1.0000), so the decay is first order: k = 5.00 × 10−3 s−1, t½ = 139 s. Worked out by the order finder from the 6 readings in the sample.

How the order finder decides

Three plots. Only one is a straight line.

Each integrated rate law turns the decay into a straight line on its own axes. Rate Bench draws all three, fits each by least squares and reports the straightest. These are the sample’s plots, drawn now.

Zero orderR2 0.8909
010020030040050000.020.040.060.080.10t (s)[A]
[A] = [A]0 − kt
First orderR2 1.0000
0100200300400500-5-4-3-2t (s)ln [A]
ln [A] = ln [A]0 − kt
Second orderR2 0.8910
01002003004005000255075100125t (s)1/[A]
1/[A] = 1/[A]0 + kt

The bench

Four instruments for the rate chapter

01 Or Order finder Concentration against time in; the order, k and half-life out, with all three plots. Open 02 Ir Initial rates A table of experiments in; the rate law, every order and k out, with the ratio steps. Open 03 Ea Arrhenius k at two or more temperatures in; the activation energy, A and k at a new temperature out. Open 04 t½ Half-life Order, k and [A]₀ in; the half-life, a countdown of half-lives and [A] at any time out. Open

What a run gives you

Answers you can check, line by line

Rate Bench is for checking your own working and for seeing why a method works. Every result comes with the numbers behind it.

  1. The data as read. Paste two columns from a spreadsheet or type them; scientific notation like 2.5e-5 or 2.5×10^-5 is understood. Anything it cannot read is listed, never silently dropped.
  2. Every fit, not only the winner. Slopes, intercepts and R2 for all three plots, or the fitted order of every reactant.
  3. The textbook steps. Ratio steps for initial rates, the two-point Arrhenius form, half-life formulas with your numbers put in.
  4. Units on every constant. k comes with its units for the order found, from M−1 s−1 to M−2 min−1.

Pricing

Free at the bench. The Pass for the lab report.

Every instrument, every plot and every step of the working are free for runs of up to 8 data rows. The Bench Pass adds the paperwork: longer runs, saved runs, a printable lab sheet and CSV. Free during preview: payments are switched off, so the passes cost nothing yet.

Read the specification sheet

The plans at a glance
PlanPriceRows a run
Freeevery instrument and step$08
Bench Passsaved runs, lab sheets, CSV$1.95a month, or $19.50 a year40
Exam Week Pass7 days, never renews$1.00paid once40