19.1 Internal Energy + Temp

Question 1

Conditions for Energy Transfer

Answer 1

• one object exerts force on another, work is done

- one object is hotter than the other, transfer through heat

Question 2

Define the INTERNAL ENERGY of an object

Answer 2

The sum of the random distribution of the Kinetic Energy and Potential Energy Energies of objects particles

Question 3

The INTERNAL ENERGY of an object INCREASES if:

Answer 3

• energy transfer by heating

- work is done on the object

Question 4

If the INTERNAL ENERGY of an object remains CONSTANT then either:

Answer 4

• no energy transfer by heat or work done

- energy transfer by heating and work done balance out, there is no resultant energy transfer

Question 5

Define the FIRST LAW OF THERMODYNAMICS

Answer 5

Change of Internal Energy = Total Energy Transfer by

heating and work done

Question 6

Define the CELSIUS SCALE of temperature:

Answer 6

• Units are Degrees Celsius, °C
• ICE POINT, 0°C, ice also melts at this point
• STEAM POINT, 100 °C

Question 7

Define the ABSOLUTE SCALE of temperature:

Answer 7

• Units are Kelvins, K

- ABSOLUTE ZERO, 0K, lowest possible temperature

Question 8

Convert °C into K

Answer 8

Temperature in °C = °C Value - 273.15K

Question 9

Define ABSOLUTE ZERO

Answer 9

The lowest possible temperature, objects at this temperature have minimal internal energy