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No dignity

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1. Light
2. Heat

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a= solid
b= melting
c- liquid
d= boiling
E=gas

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3.  Name quantities that are not in the form of energy?

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3.  Name quantities that are not in the form of energy?

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1. Pressure
2. Air

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4.  Define and explain using your own example.

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4.  Define and explain using your own example.

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1. System: The mixture
2.  Surroundings: Everything else

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8. Compare to 150 g of gold a 100 g sample has _____ specific heat.

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8. Compare to 150 g of gold a 100 g sample has _____ specific heat.

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answer ; Same

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13. How much water in grams can you completely evaporate with 9500J of energy?

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13. How much water in grams can you completely evaporate with 9500J of energy?

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9500/7220=mL.31

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7 . energy released in exothermic chemical reactions. where does this energy go ?

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7 . energy released in exothermic chemical reactions. where does this energy go ?

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released in exothermic...

energy goes in surroundings

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6. Define specific heat and give the units

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6. Define specific heat and give the units

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answers;
specific heat - The heat required to raise the tempature of a substance with a specific mass

Units -

temp=t

mass=m

heat=Q

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12. What is the heat in joules required to melt 25.0 grams of ice?

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12. What is the heat in joules required to melt 25.0 grams of ice?

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25g x 534L/G = 13,350J

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5. Identify the system and surroundings when water freezes on a citrus fruit.

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5. Identify the system and surroundings when water freezes on a citrus fruit.

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Citrus = System
Water= surroundings

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Melting point: 0 degrees
boiling point: 100 degrees
condensation: E
melting: B-C
liquid: C-D

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Melting soild salts, reaction of barium hydroxide octahydrate crystals with dry ammonium chloride

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Crystallizing liquid salts (as in sodium acetate in chemical handwarmers

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When Endothermic chemical reaction is contained all the energy stays in the system, A process or reaction that asorbs energy in a form of heat

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When the Exothermic chemical reaction is released than all the energy goes to the surroundings