An exergonic reaction proceeds with net release of free energy.
An endergonic reaction absorbs free energy
Answer: Chemical composition modification (or, physical signal would be color).
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These are dissolved in water to form colourless solutions, and then mixed together. This mixing leads to a double displacement reaction, essentially resulting in the metals 'swapping' their places in the two compounds, producing lead (II) iodide, and potassium nitrate.
