Name: ______Date: ______Period: ___
WS 1: Heat, Calorimetry, and Heating Curves
Terms and Concepts from the Notes
Kinetic energy is the energy of ______of matter that can be observed and measured.
Potential energy is energy that is ______inside matter, hidden from observation.
Temperature (T):
- a measure of the ______energy of the particlesin a sample
- measured in ______or ______
Specific Heat Capacity (c):
- amount of ______required to raise 1 ______of a substance by 1 ______.
- measured in ______(the c of water is 4.18 ______)
Calorimetry:
label each
variable in
the equation
When heat (q) is absorbed by a system, part of it (c) goes into storage as ______energy in the stretching of bonds or attractions,but part of it is used to make the molecules move around with more______energy, which raises the ______(∆T).
1.Calculate the amount of heat (q) released when 25.0 g of water at 25.0°C cools to 0.0°C.
2.Calculate the specific heat capacity (c) of a 35 g sample of an unknown metal that releases 6700 J of heat when it cools from 94oC to 29oC.
Heating Curve for Water:
3.In Section I:Heat is being absorbedas ______energy which raises the ______of the ______(state of matter).
4.In Section II:Heat is being absorbedas ______energy to overcome the ______between molecules to change the state from______to ______(a phase changecalled ______).
Heat of Fusion (∆Hfus) : ______required to change 1g of______to ______.
5.In Section III: Heat is being absorbed as ______energy which raises the ______of the ______by ___oC per gram for every ______J of heat absorbed as shown in the equation:
q = ____ x ____ x ____
6.In Section IV: Heat is being absorbed as ______energy to overcome the ______between molecules to change the state from ______to ______(a phase change called ______).
Heat of Vaporization (∆Hvap) : ______required to change 1g of ______to ______.
The ∆Hvap is larger than the ∆Hfus because ______
______.
OVER
7.Equal masses (100g) of three liquids initially at 25oC absorb the same amount of heat.
Liquid A’stemperature rose 20oC, liquid B’s rose10oC, and liquid C’s rose5oC.
Liquid ___ must have the highest specific heat capacity because its temperature rose the
______ amount because the molecules absorbed most of the heat as ______energy instead of as ______ energy.
- A student sets the dial on her hot plate at Medium to heat up some water.
After 10 minutes of heating on the Medium setting, the water begins to boil.
She decides that she needs “very hot” water so she turns the dial to High.
After waiting another 10 minutes on High, the boiling water’s temperature will be
higher / thesame / lower because the added heat is used to...
______
______
Can you define or apply all of these terms appropriately? (can you use them in conversation?)
kinetic energy (KE)temperature (T) calorimetry∆Hfus
&
potential energy (PE) heat (q)specific heat capacity (c)∆Hvap
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