A substance is heated at a constant rate. The graph shows its temperature over time. What is happening during the period where the temperature remains constant at 80°C?
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Worked Solution
Step 1: A horizontal line on a heating graph indicates a change of state.
Step [2-9]: During a change of state, temperature remains constant because the heat energy is used to overcome the forces of attraction between particles.
Step [2-9]: Since the substance is being heated, this is likely the boiling point.
Correct answer: The substance is boiling.
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