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Do Now Wednesday, January 8, 2014. Write a definition for the following words: heat temperature. 3.5 minutes. Do Now Check. By the end of the day today, IWBAT… define and differentiate between heat, temperature, and thermal energy. - PowerPoint PPT Presentation
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Do NowWednesday, January 8,
2014Write a definition for the following words:• heat• temperature
3.5 minutesDo Now Check
By the end of the day today, IWBAT…• define and differentiate between heat, temperature, and thermal energy
Why it matters in LIFE: Heat and temperature impact our lives every single day – from what we decide to wear to how much our energy bill will be each month.
Why it matters in THIS CLASS: Don’t forget about your goal to succeed!
AgendaDo Now 5 minIntro to Thermo 20 minQuick Checks 10 minQuick Writes 10 min
Wednesday, 01/08/14TEKS:
P.6E: Describe how the macroscopic properties of a thermodynamic system such
as temperature, specific heat, and pressure are
related to the molecular level of matter, including
kinetic or potential energy of atoms
By the end of today, IWBAT…
Define and differentiate between heat, thermal energy,
and temperatureEssential Question:
How are heat, thermal energy,
and temperature
different?
Topic:Thermodynam
ics
You will receive trackers and cover sheets to accompany your C-Notes and Lab Assignments for this unit.
Unit 8: Thermodynamics
THERMODYNAMICS is the
study of changes in heat and energyThis unit will build on the ideas of
energy that we learned in unit 7
A Chemistry Review… All matter is made up of millions of tiny
particles These tiny particles are constantly in
motionPHYSICS CONNECTION:
When something is in motion, what type of
energy does it have?
Demo: Water and Food Coloring What did you notice? What can you say about higher
temperature and spread of the dye? What do you think temperature is really
measuring? What type of energy is motion related to? Why does the same object feel “hotter”
when its temperature is higher? How would you define temperature?
What is temperature? Temperature: A measurement of the
average kinetic energy possessed by the particles of an object
Thermometers read temperature If velocity increases, KE will increase, so
temperature increases (and vice versa)
What is temperature?
Faster molecules = more kinetic energy = higher temperature
Slower molecules = less kinetic energy = lower temperature
Kelvin: what Scientists useFahrenheit: what
America uses
Temperature Measured in:
Celsius: what the rest of the world uses Kelvin: what asdfuse sdfgCelsius: what the rest of the world
uses
Temperature
TC : Celsius TF : Fahrenheit TK : Kelvin
Conversions:TC = 0.56TF – 32TF = 1.8 TC + 32TK = TC + 273
What is thermal energy? Thermal energy: mechanical energy of
the particles in an object Measured in Joules
What is heat? Heat: the transfer of energy from areas
of high kinetic energy (fast-moving particles) to areas of low kinetic energy (slower-moving particles)
Demo Place one hand in the beaker of cold water and one
hand in the beaker of warm water. Hold them there for 30 seconds.
Place both hands in the tub of room temperature water. Hold them there for 30 seconds.
What do you observe about the hand that was in the hot water after it enters the room temperature water?
What do you observe about the hand in the cold water after it enters the room temperature water?
Describe what you think is occurring in each hand in regard to the transfer of heat energy.
Temperature ≠ Thermal Energy ≠ HeatTemperatur
e:A
measurement of how FAST the
molecules are moving
(AKA the kinetic
energy of the
molecules)
Heat:The
PROCESS of transferring
thermal energy from where it is
high to where it is
low
Thermal Energy:
The total mechanical energy of
the PARTICLES
of an object
Quick Checks What is matter made up of? What are these particles always doing? What type of energy do these particles
have? What is temperature? What unit of temperature does most of
the world use? What unit of temperature do we use in
America? What unit of temperature do scientists
use?
Quick Checks What is thermal energy? What is mechanical energy? How is thermal energy different from the
mechanical energy we learned about last unit?
What is heat? How is heat different from thermal
energy? How is heat different from temperature? How is thermal energy different from
temperature?
Which way will heat transfer?
System Surroundings
Direction of Heat Transfer
Living Room (T=78˚F)
Outside Air (T=93˚ F)
?
Living Room
Attic (T=120˚F)
?
Attic Outside Air ?
Answer the following questions in COMPLETE SENTENCES on the back of your C-notes. Each answer should be a minimum of 2 sentences
Quick Writes
Question #1
Explain the difference between heat, temperature, and thermal energy.
Question #2
What happens to the molecules in your hand when you put it in hot water? Molecules of water?
Question #3
What happens to the molecules in your hand when you put it in cold water? Molecules of water?