Your notes from Friday for Knowledge of Skills required “to know” for chapter 5 test.
Chapter 5.1
1. Definitions Thermodynamics, Thermochemistry, Law of conservation of energy, system,
surroundings.
2. What does the law of conservation of energy state? Note a few statements follow this in the
text with some equations.
3. What is the difference between the system and the surroundings?
4. What is heat and how is it expressed?
5. What is temperature?
6. Why is the Kelvin scale never negative?
7. How do you calculate temperature in Celsius from Kelvin?
8. What is the difference between enthalpy and enthalpy change?
9. What is the difference between endothermic and exothermic reactions? Note need to consider
bonds breaking and bonds making.
10. What is the difference between enthalpy of reaction and standard enthalpy of reaction?
11. What are the three ways to represent exothermic and endothermic reactions?
12. Why is the H rxn negative for exothermic reactions if heat is “given off”?
13. Know how to do stochimetric reactions. See sample problem on page 225. Only mass to moles
will be tested.
14. In an endothermic reaction is the energy on the right side or left in a thermochemical equation?
15. Why does the enthalpy of evaporation stay even/constant/plateau between a liquid and a gas?
16. Know the enthalpies of evaporation, vaporization, condensation and freezing.
17. Why are the opposite sides equal.
18. Explain the chemical process that works in a hot pack or cold pack?
Chapter 5.2
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What is specific heat capacity? What is heat capacity? Compare and contrast these two?
What is the equation for heat change/heat transfer?
What is T and how do you calculate it?
What is a calorimeter.
What does Q of reaction equal and why?
When an acid and base neutralize what can you assume?
What is a coffee cup calorimeter? What is another name for it?
What can one assume is the value of heat capacity of a coffee cup calorimeter?
How does one use a calorimeter to determine the enthalpy of reaction?
Determine the enthalpy change of a chemical reaction and then write the thermochemical
equation? Sample problem page237.
Chapter 5.3
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What do you use to determine the quantity of heat that was released or absorbed in a chemical
reaction – answer coffee cup calorimeter.
Hess law explanation using enthalpy diagram?
What are the two ways you can calculate the enthalpy change of a chemical reaction?
What is the definition of the standard molar enthalpy of formation?
What are the two key ways one can manipulate an equation when using Hess’s Law?
Hess Law Calculations sample problem 235 and heat of formation calculations page 252 to
determine the enthalpy change of a reaction.