SPS7d. Heating Curves and Phase Diagrams

What is the purpose of a heating/cooling curve?

• To calculate the volume changes of a substance during heating or cooling.

• To understand the phase changes and energy transfer during heating or cooling process.

• To determine the color changes of a substance during heating or cooling.

• To measure the temperature of a substance during heating or cooling.

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What does a heating curve represent?

• The relationship between mass and time during the process of heating a substance.

• The relationship between temperature and time during the process of heating a substance.

• The relationship between volume and time during the process of heating a substance.

• The relationship between pressure and time during the process of heating a substance.

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What does a cooling curve represent?

• The change in pressure of a substance as it cools down over time.

• The change in temperature of a substance as it cools down over time.

• The change in volume of a substance as it cools down over time.

• The change in temperature of a substance as it heats up over time.

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During a phase change, what happens to the temperature of a substance?

• decreases

• increases

• fluctuates

• remains constant

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What is the horizontal flat portion of a heating/cooling curve indicative of?

• The temperature at which the substance starts to boil

• The temperature at which the substance starts to freeze

• The temperature at which the substance reaches its maximum temperature

• Phase change

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• melting

• boiling

• phase change

• crystallization

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• 1, 2, 3

• 4, 5

• 1, 3, 5

• 2, 4

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A phase diagram is a graph that shows the ___ at a given temperature and pressure.

• state of matter

• phase changes

• changes in temperature

• changes in pressure

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The lines on a phase diagram are where ____ occur.

• temperature changes

• pressure changes

• phase changes

• no changes

At which point on the graph do all three phases coexist? 

• A

• B

• C

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