Download ENERGY TRANSFER IN TEMPERATURE

ENERGY TRANSFER IN
TEMPERATURE
INSTRUCTED BY MS. SORN
DO NOW- THURSDAY (T) : 3/30/17
• QUESTION/ PROMPT:
• What heats Earth’s atmosphere?
ANSWER:
The atmosphere is heated by radiant energy
from the Sun- solar energy.
ATTENDANCE
TODAY’S HOMEWORK – WRITE
INTO PLANNER :
“ARGUE: CER” + STUDY FOR QUIZ
TOMORROW
KEY VOCAB WORDS 5, 6, 7
• 5. INSULATOR (n)
• Definition: A material or an object that does not easily allow heat,
electricity, light, or sound to pass through it
• 6. THERMAL (adj)
• Definition: Relating to heat
• 7. POTENTIAL (adj)
• Definition: The energy possessed by a body as a result of its position or
condition rather than its motion
HOMEWORK REVIEW
• 1. What is heat? Heat is the motion of molecules (atoms) within
an object.
• 2. What heats Earth’s atmosphere? The atmosphere is heated by
radiant energy from the Sun- solar energy.
• 3. What are the two ways energy can transfer from one material
to another? There is heat transfer by radiation and conduction
(and convection).
HOMEWORK REVIEW
4. Explain two ways that Earth’s atmosphere gets heated.
1) Air molecules are warmed by conduction
2) Water molecules are warmed by radiation coming up from Earth.
5. Thermometers measure temperature. What is temperature? Temperature is
a measure of the average kinetic energy of the molecules in a material.
• 6. Explain why the alcohol level in a thermometer goes down when the
weather gets cold. Molecules in cool air have less kinetic energy. The alcohol
molecules have lost kinetic energy (motion) and slowed down, causing the
liquid level to go down.
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COLLECTING HOMEWORK –
“HEATING THE ATMOSPHERE”
+
SIGNED SYLLABUS
GRAPHIC ORGANIZER
NOTES: ENERGY TRANSFER IN
TEMPERATURE
3/30/17
ESSENTIAL QUESTIONS
BIG IDEAS
1. What is energy of motion
called? Elaborate.
1. Energy of motion is called kinetic energy.
Different states of matter (solid, liquid, gas, even
plasma) will have molecules vibrating in
different manners. The faster molecules move,
the greater their energy.
2. Describe the rule of heat flow.
2. Heat flows from a hotter location (more
energy) to a cooler one (less energy).
NOTES: ENERGY TRANSFER IN
TEMPERATURE
3/30/17
ESSENTIAL QUESTIONS
3. How does heat transfer by
radiation work?
4. How does heat transfer by
conduction work?
BIG IDEAS
3. Radiant energy travels in the form of rays (aka
electromagnetic waves). When solar energy hits a
molecule, the energy can be absorbed. Kinetic
energy is thereby increased.
4. Energy transfers from one place to another by
contact and is known as conduction. A “hot”
molecule with a lot of KE collides with a “cold
molecule with little KE and is transferred at the
point of contact.
NOTES: ENERGY TRANSFER IN
TEMPERATURE
3/30/17
ESSENTIAL QUESTIONS
BIG IDEAS
5. How does heat transfer to the
atmosphere?
5. Land and sea that has been warmed by solar
radiation actually reradiate energy. Absorbed
energy is transferred by conduction when hot
water molecules bang into oxygen and nitrogen
molecules in the air.
6. Which tool measures
temperature?
6. Thermometers measure temperature (the
average kinetic energy of the molecules in a
material).
SAMPLE CER
Claim: Johnny has about 10
minutes available to shop before
the chocolate in his car melts.
SAMPLE CER
Evidence: The chocolate’s melting point is
38°C. At 0 minutes, the temperature is 27°C. At 10
minutes the temperature is 37°C. At 20 minutes the
temperature is 43°C. Energy is entering the car
(depicted by the arrows heading into the
windshield). Energy is trapped in the car (depicted
by the arrows in the car)
SAMPLE CER
• Reasoning:
• The chocolate in Johnny’s car has a melting point of 38°C. At time zero
minutes, Johnny stops in the mall’s parking lot and the temperature in the car is
27°C. Since the car is out in the open, it is susceptible to absorbing heat by
radiation. Radiation is the transfer of energy across space from an area of
higher temperature to an area of lower temperature. In this scenario, the area
of higher temperature would be the sun and the area of lower temperature
would be the inside of the car. After ten minutes, the transfer of energy by
radiation causes the temperature of the car to increase to 37°C, which is only
one degree lower than the chocolate’s melting point. When the time elapsed
reaches 20 minutes, the temperature becomes 43°C, which is five degrees
higher than the chocolate’s melting point. Since the chocolate’s melting point is
38°C, it would begin to melt shortly after ten minutes have elapsed.
•