Concept module
Keep one reaction recipe visible so stoichiometric ratios read as complete batches, not detached worksheet proportions.
Interactive lab
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Stable links
Starter track
Step 1 of 30 / 3 completeNext after this: Limiting Reagent and Leftover Reactants.
This concept is the track start.
Why it behaves this way
Stoichiometric ratios become easier to trust when one recipe card stays visible beside the actual supply bins. This bench keeps the recipe, the two reactant supplies, and the finished product tray on one run so the idea of a full batch never turns into detached worksheet algebra.
The key move is to count complete recipe batches, not isolated particles. If the recipe says 2 A plus 3 B, then every finished batch has to spend those packets together.
Key ideas
Frozen walkthrough
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View plansreactantAAmountValue
reactantBAmountValue
recipeAValue
1. Read one complete batch from the recipe card
2. Count how many copies of that recipe fit
3. Read the product tray as finished batches
Batch count
Common misconception
If one reactant has the larger number written next to it, that must mean it always makes more product.
Product comes from complete recipe batches, not from whichever supply has the larger raw count.
The supply ratio only works cleanly when it matches the recipe ratio shown on the same bench.
Mini challenge
Make a prediction before you reveal the next step.
Check your reasoning against the live bench.
Quick test
Misconception check
Question 1 of 2
Use the live bench to test the result before moving on.
Accessibility
The simulation shows two reactant supply bins, one product tray, and a recipe card that states how many packets of A and B one full batch needs.
A readout card reports the current recipe, the maximum possible batches, which supply is limiting, the actual output, and how much of each reactant is left after the run.
Graph summary
One graph scans possible batches against the A supply, a second scans possible batches against the B supply, and a third compares actual product with the theoretical product as percent yield changes.
Graph hover, compare mode, and the shared overlays stay tied to the same recipe bench instead of opening a separate chemistry-only view.
Carry the recipe into the next reaction step
Open the next concept, route, or track only when you want the current model to widen into a larger branch.
Use one recipe bench to see which reactant caps the output first and why the other reactant can remain in excess.
Compare actual output with the same theoretical recipe cap so percent yield stays visual and honest on one shared bench.
Keep one chemistry box visible so temperature, concentration, activation threshold, and catalysts can be read as changes in successful collisions instead of chemistry slogans.