Heating and Cooling Curves Flashcards

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Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

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What does a heating curve show?

A heating curve shows how the temperature of a substance changes over time as it is heated and changes state.

What is on the axes of a heating or cooling curve graph?

Time is on the horizontal (x) axis and temperature is on the vertical (y) axis.

On a heating curve, what does a sloping line going upwards mean?

A sloping line means the temperature is rising and the substance is in one state only, such as all solid or all liquid.

On a heating curve, what does a flat (horizontal) section mean?

A flat section means a change of state is happening and the temperature stays the same while the substance melts or boils.

Why does the temperature stay constant during melting or boiling on a heating curve?

The supplied energy is used to weaken or break forces between particles, not to raise their temperature.

Where on a heating curve can you find the melting point of a substance?

The melting point is the temperature of the flat section where the solid is changing to a liquid.

Where on a heating curve can you find the boiling point of a substance?

The boiling point is the temperature of the flat section where the liquid is changing to a gas.

What is a cooling curve?

A cooling curve is a graph that shows how the temperature of a substance changes over time as it cools and changes state.

On a cooling curve, what happens during a flat (horizontal) section?

The temperature stays constant while the substance changes state, such as gas condensing or liquid freezing.

How can you tell from a heating or cooling curve that a change of state has finished?

The change of state is finished when the flat section ends and the line starts to slope again, showing only one state is present.