Unit 3- Energy

Question 1

Potential energy-
Kinetic energy-
PE+KE= ?

Answer 1

Potential- stored
Kinetic- motion
PE+KE= total/mechanical energy

Question 2

Nonrenewable energy vs renewable
Electricity doesn’t belong to either.. why?

Answer 2

Nonrenewable- cannot be replenished in a short time
Renewable- can be replenished in a short time
Electricity is a secondary energy source- has to use another energy source to make it

Question 3

How are heat and temperature DIFFERENT

Answer 3

Heat- a measurement of total/mechanical energy in a substance
Temperature- a number related to the average KE of the molecules of a substance

Question 4

Law of conservation of energy:

Answer 4

Energy cannot be created nor destroyed, but only changed from one measure of storage into another or transferred from one object to another

Question 5

Endothermic

Answer 5

1) energy is absorbed b the system from the surroundings
2) loss of energy»temp decreases
3)particles/ions absorb energy from surroundings when rearranging

Question 6

Exothermic

Answer 6

1)energy is released from system to the surrounding
2)temp goes up»feels hot
3)release energy to surrounding as particles/ions rearrange

Question 7

Phase changes on an expo/endo graph

Answer 7

2) 334J/g- fusion/freezing or melting
4) 2260- vaporization/condensation
PE goes up, no temp or KE change
Q=HM

Question 8

Slope lines on an eco/endo graph

Answer 8

KE, temperature, speed, thermal all go up
1) 2.11- solid water
3) 4.184- liquid water
5) 2.00- gaseous water
Q=mc^T (F-i)

Question 9

The higher the specific heat, the more/less it resists temp change

Answer 9

More

Question 10

How does heat flow

Answer 10

From hot to cold until equilibrium is obtained
- final temp is always the same

Question 11

LOL charts

Answer 11

-only one change at a time

Hot Gas
—- —-
—. Liquid.
Cold Solid

-chemical is always at two