Heat is defined to be
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Heat is defined to be. The amount of microscopic translational and rotational kinetic energy in an object Energy that is transferred to an object because of a temperature difference The temperature of an object in terms of degrees Kelvin. Energy transferred (Q).

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Heat is defined to be
Heat is defined to be

  • The amount of microscopic translational and rotational kinetic energy in an object

  • Energy that is transferred to an object because of a temperature difference

  • The temperature of an object in terms of degrees Kelvin.



200 g of water at 100o is poured into 200 g of water at 0o. The resulting temperature will settle down to be

  • 0o

  • 50o

  • 100o

  • Greater than 50o but less than 100o

  • Less than 50o but more than 0o


cwater=4186 J/kg oCcgold=129 J/kg oCI use a heating element to put heat into a kg of water and a kg of gold at the same rate. Which changes temperature faster?

  • 1 kg water

  • 1 kg gold

  • They both heat up at the same rate.

Q is energy transferred


Put 100g al at 100 o c into 500g water at 20 o c what is the final t what will the final t be
Put 100g Al at 100o C into 500g water at 20o C. What is the final T?What will the final T be?

  • 100o

  • 97o

  • 20o

  • 23o

  • 60o

cAl= 900 J/kg oC

cH2O = 4186 J/kg oC


You put 0.4 kg of lead into a bucket containing 1.2 kg of pure acetone. Why in the world did you do that?


Idolatry even non believers find something to believe in
Idolatry (Even non-believers find something to believe in) pure acetone. Why in the world did you do that?

"As I study ancient scripture, I am more and more convinced that there is significance in the fact that the commandment 'Thou shalt have no other gods before me' is the first of the Ten Commandments." - President Spencer W. Kimball (Aug 1977 Ensign)


It also takes energy to melt a solid or turn a liquid into gas
It also takes energy to melt a solid or turn a liquid into gas

Latent heat of fusion vs. vaporization


You place equal weights of ice (at 0 gaso C) and boiling water (at 100o C) into a well-insulated container. What is the final temperature.

  • 0o C

  • Between 0oand 50o C

  • 50o C

  • Between 50o Cand 100o C

Lf 3.33x105 J/kg

Lv 2.26x106 J/kg

c ice 2090 J/kg·oC

water 4186 J/kg·oC

steam 2010 J/kg·oC


You place a mass gasmi at temperature Ti into a mass mw of water at temperature Tw. What will be the final temperature, and how much ice will there be?


You place equal weights of ice (at -20 gaso C) and water (at 0o C) into a well-insulated container. How much boiling water must be added to produce only water at 0o C.


L gasf 3.33x105 J/kg

Lv 2.26x106 J/kg

c ice 2090 J/kg·oC

water 4186 J/kg·oC

steam 2010 J/kg·oC


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