Energy Change in Reactions - Page 3
Questions
- How do you calculate the change in entropy for an isothermal process?
- How do we assess the enthalpy change in phase transitions?
- Is this reaction endothermic or exothermic? Gas burning in a Bunsen burner: #C_2H_6(g) + 3.5O_2(g) -> 2CO_2(g) + 3H2O(g) + 2855kJ#
- What will happen if there is no effective collision and low activation energy of reactants?
- How do you calculate the #DeltaH# for the combustion of #C_2H_5OH#?
- Thermal energy added to a substance during a change of state causes the substance's temperature to do what?
- How do you calculate the amount of heat (in kJ) required to heat 4.14 kg of water from 21.50 C to 33.85 C.?
- How can endothermic reaction be spontaneous?
- Describe what would happen to the temperature of water if a person poured 2 liters of water at 25 degrees C into a container that has 2 liters of water at 75 degrees C. What temperature would the mixture become?
- How would you explain an isothermal process?
- When electricity is produced from coal, the chemical energy in coal is first changed to what type of energy?
- Calculate the enthalpy change for the reaction.?
- Consider the following reaction: #2Mg(s) + O_2(g) -> 2MgO(s)#, #DeltaH = -1204kJ#. Is this reaction exothermic or endothermic? How do you calculate the amount of heat transferred when 2.4 grams of Mg(s) reacts at constant pressure?
- What is the energy of gases at #"0 K"#?
- What is the Second law of thermodynamics. How would you express it mathematically?
- Is the dissolution of a gas in a solvent exothermic?
- On a hot day a friend suggests that you can make your kitchen cooler by leaving the refrigerator door open. Would leaving the refrigerator door open cause the air temperature in the kitchen to decrease?
- Calculate the amount of energy released when 3.60 kg of butane (C4H10) is burnt in an unlimited supply of oxygen.?
- 3A chemical reaction produces 653 550 kJ of energy as heat in 142.3 min. What is the rate of energy transfer in kilojoules per minute.?
- The metabolism of one mole of glyceryl trioleate, #C_57H_104O_6#, a common fat, produces #3.510 ×10^4# kJ of heat. How many grams of the fat must be burned to raise the temperature of 50 g of water from 25.0C to 30.0C?