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Grade 12 chemistry urgent

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Cecilia
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Related questions

Unit 3: Energy Changes and Rates of Reaction
 
Answer the following questions
What is enthalpy?
2. What is the difference between temperature and thermal energy?
3. What is the difference between the system and the surroundings?
4. What is the difference between endothermic and exothermic?
5. What is activation energy?
6. Calculate how much energy it takes to raise the temperature of 125 grams of aluminum from 100 to 245 degrees C. The specific heat of aluminum is 0.900J/g degree C.
7. Calculate the heat change needed to raise the temperature of 1000 g of water from 5.0 degrees C to 95.0 degrees C.
8. How much energy is given off by the water in question number two if the 1000 g of water
9. Determine the specific heat of copper if it takes 10,500J of energy to raise 520.0 grams of it from 27.0 degrees C to 245.0 degrees C
10. Determine the specific heat of an unknown element if it takes 540J to raise the temperature of 55.6 grams of this element from 5.0 to 95.0 degrees C.
11. Determine the enthalpy of the following reaction:
 
 
Using the following bond enthalpy values:
Bond Bond Energy
 C-C        347
 C=C       611
 C-H        414 
 C=O       736 
 O=O       498 
 O-H        464
 
12. Calculate \Delta \mathrm{H} for this reaction:
 
 
 
using the following three equations:
                                             
                                   
           
 

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