Chemistry Unit 3 CST and TST Day

Learning Objective: Students will learn aboutthermodynamics in chemical reactions by conducting a lab and will analyze and interpret their data in writing using technical vocabulary (exothermic, endothermic, spontaneous, enthalpy) and science ideas (energy transfer).

Questions:

1. What are some possible sources of error in the lab (from yesterday)? (brain)
2. What factors will determine if a reaction is spontaneous or not? (book or brain)
3. What can be said about a reaction with H = 62.4 kJ/mol and S = 0.145 kJ/(mol·K)?

Answer choices for number 3:

• A. It is spontaneous at 500 K.
• B. It is spontaneous at 298 K.
• C. It is always spontaneous.
• D. It is never spontaneous.