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AP Chemistry · Concept Labs · don't just watch it — manipulate it

Use the model as evidence.

Select one scientific instrument, make a prediction, manipulate its controls, and use the observation to answer and explain. The model is the workspace—not a decorative preview.

Change instrument · Beer–Lambert law

Choose an instrument

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Spectroscopy · Guided investigation

Beer–Lambert law

Change one variable at a time. Record what the model shows before explaining why.

  1. 01

    Prediction

  2. 02

    Interactive model

  3. 03

    Controls

  4. 04

    Observation

  5. 05

    Question

  6. 06

    Explanation

Prediction · commit before using the instrument

What should the model show?

You double the concentration and keep the path length fixed. The absorbance A will: