CH38 – Enthalpy

Dates

• P1 – Wednesday, April 26th
• P3 – Thursday, April 27th
• P5 – Wednesday, April 26th

Lab Recap

• What measurements were made?
• What is being determined?
• What are the givens?
• What calculations are needed?

New Idea – Enthalpy

• akin to energy of system (sort of)
• determined by measuring heat flow at constant pressure
• symbol = “H”
• changes in energy in a reaction = ΔH
• can be related to the moles of a reaction
• type of energy – units of energy

Enthalpy Practice

• Appendix 4 in the Textbook lists stuff
• ΔH_rxn, ΔH_f, ΔH_comb = many types of ΔH [LINK]
• combustion example methane
• connect mass of substance to energy released to water

Homework

• Finish work in LNB (due Class 39)
• Note: P1 students can turn in LNB on Monday if they wish

Notes

• Test 04 = Final Long Block Cycle of Semester (May 19, 22, 23)
• Practice worksheets in shared folder