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Energy Review

Energy Review. Test: Monday 3/31 (period 7) and Tuesday 4/1 (period 6) After school review Friday 3/29. Heating/Cooling Curve. During the polar vortex, people were taking boiling water and throwing it to watch it freeze.

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Energy Review

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  1. Energy Review Test: Monday 3/31 (period 7) and Tuesday 4/1 (period 6) After school review Friday 3/29

  2. Heating/Cooling Curve • During the polar vortex, people were taking boiling water and throwing it to watch it freeze. • Draw a heating curve and calculate the enthalpy change if water at 100 C is thrown into -7C air and freezes solid!

  3. Hess’s Law

  4. Systems and Surroundings Problem • Calculate the mass of iron that would heat up 100 mL of water by 3 degrees Celsius if the iron was initially heated to 80 C and the final temperature of the water was 26 C.

  5. Drawing an energy diagram • N2 + 2O2 + 16.4 kCal2 NO2 • Draw an energy diagram, label reactants, products and enthalpy change, and identify if the reaction is endothermic or exothermic. • Also, you must label enthalpy change in joules!!!

  6. Determining molar enthalpy change • Given the equation below, what would be the enthalpy change if 40 g of nitrogen monoxide was reacted with excess oxygen gas.

  7. Distinguish between: • Enthalpy, energy, heat, temperature, entropy. • Specific heat of: water, air, metals • Draw a graph showing the relative location of each was a function of x (mass per unit of energy) and y (temp) • Explain how this is important in terms of climate and everyday applications.

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