1. | The SI unit of energy is |
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2. | How many calories are required to raise the temperature of 75.0 g of water from 20C to 50C? |
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3. | If 1 Calorie 4.18 kJ, how many kJ of energy can be released by an apple containing 125 Cal? |
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4. | The temperature of a 6.0-g sample of glass changed from 20C to 45C when it absorbed 550 J of heat. What is the specific heat of this glass sample? |
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5. | The enthalpy of a system is the same as its: |
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6. | When your body is warmed by an electric blanket during the winter, this process is said to be |
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7. | A student mixes two water solutions with an initial temperature of 25.0C to form a final solution with a mass of 65.0 g at 30.0C. What is the heat change, in kJ, for this reaction? |
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8. | Given the equation 2Mg(s) O2(g) y2MgO(s) 72.3 kJ, which of the following is true? |
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9. | Given the equation in question 18, how much heat is involved in the production of 5.0 mol of MgO? |
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10. | Given the equation Si(s) + 2Cl2(g) ------>SiCl2(g) ------>SiCl2(l) + 687 kJ, how much heat is produced when 106 g of Cl2 react? |
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11. | Which of the following statements is true? |
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12. | How much heat, in kJ, is required to melt 54.0 g of ice at 0C into water at 0C if ^Hfus for water = 6.01 kJ/mol? |
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13. | How much heat is required to convert 9.00 g of water at 100C into steam at 100C, if ^Hvap for water = 40.7 kJ/mol? |
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14. | If the molar heat of solution of NH4NO3 is 25.7 kJ/mol, how much heat (in kJ) would be required to dissolve 20.0 g of NH4NO3 in water? |
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15. | Calculate the enthalpy change, H in kJ, for the reaction H2O(s) ---->H2(g) + 1/2O2(g) Use the following: H2(g) + 12O2(g) ---->H2O(l) ^H= 285.9 kJ H2O(s) yH2O(l) H+6.0 kJ |
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