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(CHEM 1305 ) Phase Change Worksheet

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WS F Phase Change Problems Worksheet- Introductory Chemistry (CHEM 1305 )

1. In the diagram above, label all of the states of matter.
2. Assuming the above diagram is water, label the temperatures of the flat portions
of the diagram above.
3. In the first rising portion of the graph (a), describe what is happening as energy is
added. Discuss this in terms of the kinetic molecular theory.
4. In the 1st flat portion of the graph (b), describe what is happening as energy is
added. Discuss this in terms of bonding forces of attraction.
5. In the 2nd rising portion of the graph (c), describe what is happening as energy is
added. Discuss this in terms of the kinetic molecular theory.
6. In the 2nd flat portion of the graph (d), describe what is happening as energy is
added. Discuss this in terms of bonding forces of attraction.
7. In the 3rd rising portion of the graph (e), describe what is happening as energy is
added. Discuss this in terms of the kinetic molecular theory

8. What is the formula used for calculating the heat involved in a phase change?
9. During a phase change, how much does the temperature change? How much does
the KE change? Does the potential energy change?
10. What is the formula used to calculate the heat required to warm or cool one phase
of matter?
11. When you heat one phase of matter, how do you know that the KE changes?
12. What is meant by the negative sign in an answer like “-46.8 kJ”? When would
you use a positive sign?
– 2 –
13. If you must add 25 kJ to raise the temperature of an ice cube from -15°C to -10°C,
is this an endothermic or an exothermic process.
14. How much heat is required to raise 40 grams of water from 30°C to 70°C?
15. How much water can be raised from 25°C (room temperature) to 37°C body
temperature by adding the 2,000 kJ in a Snickers Bar?
16. Which releases more heat when it is lowered by 8°C, 100 grams of ice, water, or
steam? How much heat is released by the one which releases the most?
Water will release the most energy since the specific heat of liquid water is the
highest
17. How much heat does it take to melt 65 grams of ice at 0°C?
18. Calculate the amount of energy required to change 100 grams of solid ice at 0°C
to gaseous steam at 100°C. (Be aware of units: kJ or J?) How many steps does
this take?

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(CHEM 1305 ) Phase Change Worksheet

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