temperature energy heat - college of dupage of temperature •define energy and distinguish among...
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![Page 1: Temperature Energy Heat - College of DuPage of temperature •Define energy and distinguish among types of energy ... different energy units •Apply specific heat concept to heat](https://reader035.vdocument.in/reader035/viewer/2022062907/5ab231f97f8b9ad9788d1668/html5/thumbnails/1.jpg)
Energy
Temperature
Energy
Heat
![Page 2: Temperature Energy Heat - College of DuPage of temperature •Define energy and distinguish among types of energy ... different energy units •Apply specific heat concept to heat](https://reader035.vdocument.in/reader035/viewer/2022062907/5ab231f97f8b9ad9788d1668/html5/thumbnails/2.jpg)
Learning objectives
• Perform conversions among different
scales of temperature
• Define energy and distinguish among types
of energy
• Perform simple energy calculations using
different energy units
• Apply specific heat concept to heat
calculations
• Determine caloric contents of food stuffs
based on composition of macronutrients
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Temperature is the
measure of hotness
• A fundamental unit. There
are three(3) temperature
scales
BPH20
FPH2O
Difference
(1) Fahrenheit (oF)
212° 32° 180°
(2) Celsius (centigrade) (oC)
100° 0° 100°
(3) Kelvin (K)
373 273 100
![Page 4: Temperature Energy Heat - College of DuPage of temperature •Define energy and distinguish among types of energy ... different energy units •Apply specific heat concept to heat](https://reader035.vdocument.in/reader035/viewer/2022062907/5ab231f97f8b9ad9788d1668/html5/thumbnails/4.jpg)
Temperature
conversions
• Conversion:
Kelvin to Celsius (K -> ºC) ºC = K - 273
Celsius to Kelvin (ºC -> K) K = ºC +
273
Celsius to Fahrenheit (ºC -> ºF)
i multiply ºC x 9/5
ii Add ºC x 9/5 + 32
Fahrenheit to Celsius (ºF -> ºC)
i add ºF - 32
ii multiply (ºF - 32) x 5/9
![Page 5: Temperature Energy Heat - College of DuPage of temperature •Define energy and distinguish among types of energy ... different energy units •Apply specific heat concept to heat](https://reader035.vdocument.in/reader035/viewer/2022062907/5ab231f97f8b9ad9788d1668/html5/thumbnails/5.jpg)
Working with temperature
conversions
![Page 6: Temperature Energy Heat - College of DuPage of temperature •Define energy and distinguish among types of energy ... different energy units •Apply specific heat concept to heat](https://reader035.vdocument.in/reader035/viewer/2022062907/5ab231f97f8b9ad9788d1668/html5/thumbnails/6.jpg)
Heat and chemical
reactions
• The burning candle is
a chemical reaction
• It releases energy
that heats the air
molecules
• Heat is flow of energy
from a higher to a
lower temperature
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Energy from chemical
reactions performs work
• Energy is capacity to do work
• In what way is a human like a
car?
• Both burn fuel to run
• Humans burn glucose
• C6H
12O
6+ O
2= CO
2+ H
2O
• Cars burn petrol
• C8H
18+ O
2= CO
2+ H
2O
![Page 8: Temperature Energy Heat - College of DuPage of temperature •Define energy and distinguish among types of energy ... different energy units •Apply specific heat concept to heat](https://reader035.vdocument.in/reader035/viewer/2022062907/5ab231f97f8b9ad9788d1668/html5/thumbnails/8.jpg)
Energy comes in many
forms
• Kinetic energy is energy due to motion
• Heat
• Rotation
• Vibration
• Translation
• Potential energy is energy due to position
or state
• Height
• Chemical
• Electrical
• Coiled spring
![Page 9: Temperature Energy Heat - College of DuPage of temperature •Define energy and distinguish among types of energy ... different energy units •Apply specific heat concept to heat](https://reader035.vdocument.in/reader035/viewer/2022062907/5ab231f97f8b9ad9788d1668/html5/thumbnails/9.jpg)
Energy can be
converted
• Processes convert
energy from one form
to another
• Falling down stairs
• (potential → kinetic
→ pain)
• Chemical reaction
• (potential →
heat/light)
• Battery
• (potential →
electrical)
• Engine
• (potential → heat →
kinetic)
![Page 10: Temperature Energy Heat - College of DuPage of temperature •Define energy and distinguish among types of energy ... different energy units •Apply specific heat concept to heat](https://reader035.vdocument.in/reader035/viewer/2022062907/5ab231f97f8b9ad9788d1668/html5/thumbnails/10.jpg)
But it never goes away
• Energy is conserved in any
process
• None is lost
• None is gained
• Law of Conservation of Energy:
Energy is neither created nor
destroyed in a chemical
reaction
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Perpetual motion is a thing
of smoke and mirrors
• Visit the
museum of
unworkable
machines to
view a history of
conmen and
failure
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Measuring energy: calories,
Calories and joules
• calorie is energy
required to raise
temperature of 1 g of
water 1 degree C
• Calorie is the food
version = 1,000 cal
• Raises temperature of
1 pint of water 3.8ºF
• Joule is SI unit derived
from mechanical work:
work done when force
of 1 Newton is applied
for 1 meter
1 cal = 4.18 J
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Common energy
conversions
• 10 g of octane is burnt to produce
8500 J. How much is that in
calories? 1 cal = 4.18 J
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Specific heat (capacity)
• Specific heat (capacity): energy required
to raise temperature of 1 g of substance
by 1ºC
• Units are J/gºC or cal/gºC
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Champagne from a
styrofoam cup: Measuring
heat change• Calorimetry is process
used to measure heat
change of reaction
• Heat change in
calorimeter is:
Q = mH2O
x ΔTH2O
x SHH2O
Weigh Measure Know