Energy Change in Reactions - Page 5
Questions
- What is the amount of energy needed to start a chemical reaction?
- How can you best describe the transfer of heat that occurs when 1.40 mol of #H_2# reacts?
- How much energy is absorbed if 5 kg of aluminum is heated from 10-20 degrees C? (c of aluminum is 900 J/Kg)?
- What is a process that absorbs heat?
- During an isothermal process, 5.0 J of heat is removed from an ideal gas. What is the change in internal energy?
- Why are told that a sample of matter gives energy as it changes. Can you conclude type of change occurred? Why or not?
- For an isothermal process, S = __________?
- If 6.00 moles of a monatomic ideal gas at a temperature of 235 L are expanded isothermally from a volume of 1.26 L to a volume of 4.08 L. How would you calculate the work (W) done by the gas?
- How do you calculate work for isothermal processes?
- How much energy, in kilojoules, are released or absorbed from the reaction of 1 mole of #N_2#, nitrogen, with 3 moles of molecular hydrogen, #H_2#, to form 2 moles of ammonia, #NH_3#?
- What process transfers heat by electromagnetic waves?
- What are four examples of changes of energy?
- What is the transfer of energy through empty space called?
- How much heat is released when 2.00 kg of aluminum solidifies? How many kJ is this?
- What is the number of joules of heat energy released when 20 grams of water is cooled from 293 K to 283 K?
- Copper oxide reacts much faster with acid at 40°C than at 20°C. Why is this?
- How much energy must be transferred to raise the temperature of a cup of coffee (250 mL) from 20.5 C (293.7 K) to 95.6 C (368.8 K)? Assume that water and coffee have the same density (1.00 g/ mL), and specific heat capacity 4.184 J/ gK)?
- Can the entropy of an ideal gas change during an isothermal process?
- What is the difference between an exothermic process and an exothermic reaction?
- How do you determine the heat of formation of hydrogen peroxide from the given bond energies: #H_2(g) + O_2(g) -> H_2O_2(g)#? Bond energies: H-H = 432; O2 = 494, O-H = 459. O-O = 142?