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lifesaver
Give 20 points!
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gift
Win 25 points!
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fairy
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25
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lifesaver
Give 25 points!
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15
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Claculat the energy needed to heat 60 g of aluminum from 100 C to 250 C. The specific heat of Al is 0.89 J/(g.c)
8.01 KJ or 8010 J
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thief
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25
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fairy
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25
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fairy
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25
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banana
Go to last place!
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15
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How much heat is required to vaporize 343 g of liquid ethanol C2H5OH? (Hvap=38.6 KJ)
287 KJ
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15
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How much heat is released when 1255 g of water condenses to a liquid at 100C? ^Hcond= -40.7 Kj/mol
2834.5 KJ
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15
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What does the letter q represent in this equation? q=m x c x ^t
heat absorbed or released
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15
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Calculate the energy released when 4570 g of iron cools from 1000 C to 20 C. The specific heat of iron is 0.45 J/(g.c)
-2015.37 KJ or -2015370J
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15
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How much heat is released by the combustion of 206 g of hydrogen (H2)? ^Hcomb = -286 KJ/mol
29166 KJ
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10
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What is one difference between an endothermic and an exothermic reaction?
exo- heat released to surroundings, temp of system goes down endo- heat absorbed by system, temp of system goes up
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15
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What does the first law of thermodynamics say?
energy cannot be created or destroyed only changed
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