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## PowerPoint Slideshow about ' Heat is defined to be' - lani

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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.

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 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) 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

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.

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