Rate story
Keeps the chemistry bench honest by separating how often particles meet from how often those meetings actually react.
Temperature 3.1 Concentration 1.4
Concept module
Reaction Rate / Collision Theory
Keep one chemistry box visible so temperature, concentration, activation threshold, and catalysts can be read as changes in successful collisions instead of chemistry slogans.
The simulation shows a particle box with reactants moving inside it, plus visible cues for all collisions, successful collisions, and the barrier-clearing share. Sliders change temperature, concentration, and activation threshold, and a toggle applies a catalyst. A readout card reports the current temperature, concentration, threshold, successful share, and successful-collision rate so the learner can compare the visual box with the graph response. The current mixture makes about 32.73 collisions per second, and about 12.26 of them succeed. Some collisions are energetic enough to react, but unsuccessful hits still dominate the box. The collision frequency is moderate, so both crowding and energy still matter. With no catalyst, the only way to raise the successful fraction is to change the energy scale or the barrier itself.
Interactive lab
Keep the stage, graph, and immediate control feedback in one working view.
Time
0.00 s / 24.0 sLiveTemperature and concentration sweeps stay parameter-based while the time rail inspects the live collision box and the difference between all hits and successful ones.0.00 s24.0 s
Reaction rate and collision theory
Keep particle motion, activation threshold, and successful-collision rate on the same bench so chemistry still teaches through one visible cause-and-effect loop.
Graphs
Switch graph views without breaking the live stage and time link.
Rate vs temperature
Compare all collision attempts with the successful ones as temperature changes.
Temperature scale: 1.4 to 5.4Collisions per second: 0 to 64
Successful collisionsAll collisions
Controls
Adjust the live parameters and watch the bench respond.
Raise or lower how energetic the particles are.
Change how crowded the collision box is.
Raise or lower the energy barrier that collisions must clear.
More tools
Secondary controls, alternate presets, and less-used toggles stay nearby without crowding the main bench.
Show
More tools
Secondary controls, alternate presets, and less-used toggles stay nearby without crowding the main bench.
More presets
Presets
Predict -> manipulate -> observe
Keep the active prompt next to the controls so each change has an immediate visible consequence.
MisconceptionPrompt 1 of 1
A catalyst changes the barrier story without making the particles hotter. Look for the successful fraction to rise even when the motion cue barely changes.
Equation map
See each variable before you move it.
Select a symbol to highlight the matching control and the graph or overlay it most directly changes.
Temperature
3.1Changes how energetic and active the particles are inside the same collision box.
Graph: Rate vs temperatureGraph: Successful fractionOverlay: Energy cueOverlay: Collision pulses
Equations in play
Choose an equation to sync the active symbol, control highlight, and related graph mapping.
More tools
Detailed noticing prompts, guided overlays, and challenge tasks stay available without taking over the main bench.
Hide
More tools
Detailed noticing prompts, guided overlays, and challenge tasks stay available without taking over the main bench.
What to notice
Use the live box and the rate graphs together. These prompts are trying to keep the chemistry visual before it turns into slogans.
MisconceptionPrompt 1 of 1
A catalyst changes the barrier story without making the particles hotter. Look for the successful fraction to rise even when the motion cue barely changes.
Control: Use catalystControl: Activation thresholdOverlay: Energy cueOverlay: Threshold cue
Guided overlays
Focus one overlay at a time to see what it represents and what to notice in the live motion.
3 visible
Overlay focus
Energy cue
Show particle streaks so the temperature change stays visible in the box.
What to notice
- Heating the mixture makes the particles move more vigorously before you ever read the graph.
Why it matters
It keeps the temperature story visual instead of turning it into a hidden parameter.
Control: TemperatureGraph: Rate vs temperatureGraph: Successful fractionEquation
Challenge mode
Use the chemistry bench honestly: make the reaction meaningfully faster without simply cramming the box full of particles.
0/1 solved
ConditionCore
4 of 6 checks
More success, not just more hits
Build a setup where the reaction is clearly active even though concentration stays modest. Keep the threshold cue and collision pulses on so the rate story stays visible.
Graph-linkedGuided start2 hints
Suggested start
Stay with a fairly moderate concentration. The point is to improve success honestly rather than by crowding.
Matched
Open the Rate vs temperature graph.
Rate vs temperatureMatched
Keep the Threshold cue visible.
OnMatched
Keep the Collision pulses visible.
OnPending
Keep concentration modest, between 0.9 and 1.15.
1.4Matched
Raise the successful-collision rate into the 12 to 15 range.
12.26Pending
Make the successful share clearly strong, between 48% and 62%.
0.37The checklist updates from the live simulation state, active graph, overlays, inspect time, and compare setup.
The current mixture makes about 32.73 collisions per second, and about 12.26 of them succeed. Some collisions are energetic enough to react, but unsuccessful hits still dominate the box. The collision frequency is moderate, so both crowding and energy still matter. With no catalyst, the only way to raise the successful fraction is to change the energy scale or the barrier itself.
Equation detailsDeeper interpretation, notes, and worked variable context.
Threshold story
Explains why heating the mixture can raise the successful share even before concentration changes.
Temperature 3.1 Activation threshold 2.8
Catalyst story
Shows that a catalyst changes the barrier side of the story instead of simply heating the particles.
Activation threshold 2.8 Catalyst Off
Progress
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Stable links
Starter track
Step 1 of 20 / 2 completeRates and Equilibrium
Next after this: Dynamic Equilibrium / Le Chatelier's Principle.
1. Reaction Rate / Collision Theory2. Dynamic Equilibrium / Le Chatelier's Principle
This concept is the track start.
Short explanation
What the system is doing
Reaction rate becomes easier to trust when the collision story stays visible. This module keeps one particle box, one activation threshold, and one live rate readout together so temperature, concentration, and the barrier all stay attached to the same cause-and-effect bench.
The key distinction is that more collisions are not automatically more reaction. Concentration mostly changes how often particles meet, while temperature and barrier changes decide how many of those meetings are energetic enough to succeed.
Key ideas
01Reaction rate depends on successful collisions, not just on how often particles hit each other.
02Raising temperature increases both how often particles collide and how likely those collisions are to clear the barrier.
03A catalyst changes the barrier story without having to make the particles hotter.
Worked example
Read the full frozen walkthrough.
Frozen walkthrough
Use the current chemistry bench instead of a detached worksheet. The same controls drive the particle box, the response graphs, and these substitutions.
Live worked examples are available on Premium. You can still read the full frozen walkthrough on the free tier.
View plansFrozen valuesUsing frozen parameters
For the current mixture, how do all collisions and successful collisions differ?
Temperature
3.1
Concentration
1.4
Activation threshold
2.8
1. Read how often the particles collide
At the current temperature and concentration, the box makes about 32.73 collision attempts each second.
2. Read how many of those hits clear the threshold
Only about 37.46% of those collisions clear the effective barrier.
3. Turn that into a reaction rate
That leaves about 12.26 successful collisions each second and about 20.47 unsuccessful ones.
Current successful-collision rate
The box is busy, but most hits still fail the barrier test, so all-collision count and successful-collision rate need to be kept separate.
Common misconception
If concentration increases, then the reaction must speed up because every extra collision is automatically a successful one.
Higher concentration mainly creates more collision attempts.
Whether those attempts become reactions still depends on how many collisions clear the activation threshold.
Mini challenge
Make the reaction noticeably faster without relying on a very crowded box.
Prediction prompt
Decide whether you should change the collision frequency, the barrier, or the successful fraction before you try it.
Check your reasoning
You need a setup where a decent share of collisions clears the barrier even though concentration stays moderate.
That is the cleanest way to separate more collisions from more successful collisions. The rate rises because the successful fraction improves, not because the box is simply packed.
Quick test
Misconception check
Question 1 of 3
Answer from the live chemistry story, not from a memorized slogan.
Which statement is the most honest one?
Choose one answer to reveal feedback, then test the idea in the live system if a guided example is available.
Accessible description
The simulation shows a particle box with reactants moving inside it, plus visible cues for all collisions, successful collisions, and the barrier-clearing share. Sliders change temperature, concentration, and activation threshold, and a toggle applies a catalyst.
A readout card reports the current temperature, concentration, threshold, successful share, and successful-collision rate so the learner can compare the visual box with the graph response.
Graph summary
One graph compares all collision attempts with successful collisions as temperature changes, a second does the same for concentration, and a third shows the successful fraction against temperature.
Graph hover, compare mode, and the shared overlays all stay tied to the same chemistry bench instead of opening a separate view.
Keep the chemistry branch moving
Keep moving through the concept map.
These suggestions come from the concept registry, so the reason label reflects either curated guidance or the fallback progression logic.
Carry the collision story into a reversible system that re-balancesRates and Equilibrium
Dynamic Equilibrium / Le Chatelier's Principle
Watch a reversible chemistry bench keep changing microscopically while the mixture settles toward a new balance after each disturbance.
Useful comparisonThermodynamics
Temperature and Internal Energy
Compare average particle motion with whole-sample energy, vary amount and heating, and see why a phase-change shelf breaks naive temperature-only reasoning on one compact thermal bench.
Useful comparisonThermodynamics
Ideal Gas Law and Kinetic Theory
Connect pressure, volume, temperature, and particle number on one bounded particle box, then read the same pressure changes back as changes in particle speed and wall-collision rate.