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Directions/Instructions:
Read the description of your performance task in the
activity proper. Consult the rubric for grading in the last page.
Activity Proper:
"Creating a Heating Curve: Team Assessment"
Graph the heating curve of ethanol using the information given. Check off
each box as you add additional information to your graph so that none is missed.
Each team member must complete his/her own graph. Refer to the sample Heating
Curve Template for Ethanol below.
Background Information on Ethanol:
Boiling point 60 °C
Melting point -105 °C
Starting temperature = -120 °C
1. After two minutes, frozen cold ethanol starts to melt. It takes two minutes to
melt completely.
2. After eight more minutes, it begins to boil. It boils for six minutes.
3. Heat is added for two more minutes until ethanol reaches 80 °C.
4. Label "Melting" where this takes place.
5. Label "Vaporization" where this takes place.
6. Label "Phase Change" where a phase change occurs.
7. Indicate where ethanol is only a SOLID, only a LIQUID, and only a GAS.
8. Of the three phases, label which phase has: Weakest IMF (intermolecular
force), Strongest IMF, and Medium IMF.k

Sagot :

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