Agenda:
1. New seating assignments.
2. Do a powerpoint review of conduction, convection,
radiation, basic heat principles, temperature
conversion, specific heat calculation.
3. Do a Kahoot review of conduction, convection, and
radiation. Actual names or initials ONLY. Initials cannot
spell anything inappropriate.
4. Take the test. No talking. No phones.
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What’s coming up next week?
1. IPR cutoff today at 4pm. Progress reports go home on
Friday. All missing work needs to get to me by the end
of class so I can grade it during my conference period.
This test will not be on the IPR.
2. We will cover Lab Safety on Thursday. That day we will
talk about lab safety, ensure that we know where all the
safety equipment is, and take a quiz on lab safety.
There will also be a contract to take home and get
signed by a parent.
3. On Monday next week we will start our new unit. We will
be covering States of Matter and Phase Changes.
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Review: Heat
Transfer
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1. During the summer it’s cooler in the
basement of your home than the upstairs.
Conduction
Convection
Radiation
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2. You sit in front of a fireplace and feel the
warmth coming from it.
Conduction
Convection
Radiation
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3. Your feet burn when you walk barefoot on a
black road on a hot summer day.
Conduction
Convection
Radiation
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4. The reason why the black top is hot in the
first place.
Conduction
Convection
Radiation
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5. The handle of metal spatula gets hot while
sitting in a hot skillet.
Conduction
Convection
Radiation
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6. Eric the cat heats himself on a cold winter
day by sitting on the hood of a warm engine.
Conduction
Ah… this is
better
Convection
Radiation
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7. The best place to put a heater is at floor
level.
Conduction
Convection
Radiation
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8. The red alcohol in a thermometer rises
when the bulb of it is put in boiling water.
Conduction
Convection
Radiation
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9. Sunlight is absorbed by the Earth after it
has made a 100,000,000 mile journey through
empty space.
Conduction
Convection
Radiation
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10. Packing cans of soda in a cooler full of
ice will cause them to become very cold.
Conduction
Convection
Radiation
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Learning Check – Test question just like this!
When you heat 200 g of water for 1 minute, the water
temperature rises from 10°C to 18°C.
400 g
200 g
If you heat 400 g of water in the same pan with the
same amount of heat for 1 minute, to what
temperature do you expect it to rise?
1) 8°C
2) 14°C
3) 26°C
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Solution
2) 14°C
Heating twice the mass of water using the same
amount of heat will raise the temperature only half as
much. Since 200 g heated up by 8 degrees, 400 g will
heat up by only 4 degrees. 10 + 4 = 14°C.
400 g
200 g
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How many joules of heat are needed to raise the temperature of
10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum
is 0.90 J/g°C?
m=
∆T =
c=
Q = mc ∆T = (10.0 g) x (0.90 J/g°C) x (33 °C)
Q = 297 J
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Converting from Celsius to Fahrenheit
A person with hypothermia has a
body temperature of 34.8 °C. What
Is that temperature in °F?
TF = 1.8(TC) + 32 °
TF = (1.8)(34.8 °C) + 32 °
= 62.6 ° + 32 °
= 94.6 °F
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Converting from Celsius to Kelvin
What is normal body temperature of 37 °C in kelvins?
2) 310 K
TK
=
=
=
TC + 273
37 °C + 273
310. K
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Solution
The normal temperature of a chickadee is 105.8 °F.
What is that temperature on the Celsius scale?
c) 41.0 °C
TC =
TF – 32 °
1.8
=
(105.8 – 32 °)
1.8
=
73.8 °F = 41.0 °C
1.8 °
tenth’s place
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5 heat transfer in general
9 conduction, convection, radiation
(definition and identify)
3 heat rising and cold sinking (which
direction do they move and why)
2 what are thermal conductors and
insulators (definition and identify)
4 calculating a temperature conversion
4 specific heat in general, but only one
calculation
Formulas will be provided for the test
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TF = 1.8(TC) + 32 °
TC = (TF – 32 °) / 1.8
TK =
TC + 273
TC =
TK - 273
Q = mc(Tf – Ti)
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