Energy
Transformations
Heat Transfer
Heating Curves
Specific Heat
100
__________ energy is the energy of motion, either kinetic or potential
Mechanical
100
What kind of energy transformation occurs on a pool deck during a hot day
What is light (radiant) energy to thermal energy
100
The earth is heated by the sun through what form of heat transfer?
Radiation
100
What happens to temperature during a phase change?
STAYS THE SAME
100
Specific Heat is the amount of energy it takes to increase the temperature of 1 gram of a substance by 1 degree Celsius.
What are the units for specific heat?
J/g°C
200
What is the energy of the motion of particles?
Thermal/Heat
200
Identify the START and END forms of energy:
When a nuclear reactor splits an atom to boil water
Nuclear --> thermal
200
Heat transfer through touch is
Conduction
200
Name the phase change from D --> E
Evaporation/Boiling/Vaporization
200
In terms of specific heat, describe insulators vs. conductors
Insulators: High specific heat
Conductors: Low specific heat
300
What is the Law of Conservation of Energy?
Energy cannot be created or destroyed
300
Identify the START, MIDDLE and END forms of energy:
When a battery is connected to a bulb through a wire
Chemical --> electrical --> light
300
When something heats up, how is the movement of particles affected?
Particles move FASTER
300
Name a phase change that gains energy
Melting or Evaporating/boiling/vaporization
300
Which one do I choose if I want something that heats up quickly and cools back down quickly?
Copper (lowest specific heat)
400
If temperature goes down, what does that mean for the kinetic energy of particles?
Particles SLOW DOWN
400
When a ball rolls down a track, it has LESS kinetic energy at the bottom than the potential energy it had at the top. Where did the rest of the energy go?
LOST AS HEAT
400
What state of matter conducts heat the best AND WHY?
solid- particles closer together
400
Where is the kinetic energy of molecules INCREASING?
A to B, C to D, and/or E to F
400
I want to bake a loaf of bread, and I need a pan with a material that takes a while to heat up and will hold it's temperature for a long time.
Do I want something with a low or high specific heat?
High specific heat
Takes longer to heat up, and longer to cool down.
500
As a ball rolls down a hill, potential energy transforms into kinetic energy. What happens to total energy?
STAYS THE SAME
500
Identify the START, MIDDLE, and END forms of energy:
When a solar panel is used to power an electric fan
Light --> electrical --> mechanical (movement of blades)
500
Where should you put an ice pack to cool down a warm can the fastest? What type of heat transfer is this?
On TOP- cool liquid sinks, pushes warm liquid up against the ice pack
CONVECTION
500
Where on the heating curve is the potential energy increasing?
B to C AND D to E
500
A 50 gram piece of glass with the specific heat of 0.84 J/g°C is heated from 35°C to 46°C. How much heat is added to the glass?
(50g)(0.84J/g°C)(11°C)=
462J