CHEMISTRY COMMUNITY

Adam_Alyafaie_1L

Lavelle you are a great teacher you really cares about your students. I appreciate the extra mile you went for us when it came to office hours and PLRs. I hope you have a fantastic break and continue teaching the way you have been.

PS please don't make the final hard.

Adam_Alyafaie_1L

From what I understand, torsional strain is when electron densities are to close(like in an eclipsed conformation) and steric strain is when atoms are too close together. However, when atoms are too close together aren't their electrons too close and thus it also has torsional strain? So do they go ...

Adam_Alyafaie_1L

Im pretty confused on the difference between common names and IUPAC. In the course reader it says that iso and neo are for common names but in the book they sometimes combine the use of iso with IUPAC. Also what is the difference between Neo and tert-. They both have the same structure so when do yo...

Adam_Alyafaie_1L

I know that you want to avoid having an intermediate molecule in your rate law but is it okay to have a catalyst in your rate late or are you suppose to substitute it somehow?

Adam_Alyafaie_1L

Do stoichiometric coefficients affect the integrated rate law of reactions. For example say a first order reaction was 2A-->B+C would the two have any effect on the equation k[A] or ln[A]=-kt + ln[A]0?

Adam_Alyafaie_1L

Yes you're exactly right. It goes the half reaction in the cathode(the reduction reaction) then the salt bridge then the half reaction in the anode(the oxidation reaction). If one of the half reactions does not have a solid then add pt(s) on the outside of that half reaction. Also if the two compone...

Adam_Alyafaie_1L

For number 3 on the chapter 14 book problems one of the half reactions is Cl2 + 2e --> 2Cl-. Im petty confident this is a reduction reaction because Cl gains electrons but the answer key says Cl2 is the oxidizing agent. Can someone explain?

Adam_Alyafaie_1L

So this notation translates to Ni(s) + Ag+(aq) --> Ni[2+](aq) +Ag(s). The charges are not balanced in this equation so you must break the reaction into its half-reactions which are: Ni(s)-->Ni[2+](aq) + 2e Ag+(aq) + e --> Ag(s) Now multiply the second reaction by two so the electrons cancel out. The...

Adam_Alyafaie_1L

So I am confused on when calculating the change in enthalpy under standard conditions in order to find the change in Gibbs free energy. Say they asked calculate the change in enthalpy for the formation of CO. Would you use the chemical reaction: 2C + O2 --> 2CO or C + 1/2O2 --> CO. How do you know w...

Adam_Alyafaie_1L

Hey so your question is on part b right? Think of it through the formula w=-NRTlnV2/V1 where V2 is final volume and V1 is the initial volume. Since we are going from a gas to a liquid the volume will decrease, lets say it goes from 2 to 1. Then you will get ln1/2 which will give you a negative numbe...

Adam_Alyafaie_1L

Since reversible reactions are isothermal will the change in internal energy always be zero meaning that heat and work will have the same magnitudes but different signs? Also in an isolated system, is temperature constant thus the change in internal energy is zero or is that only isothermal systems?...

Adam_Alyafaie_1L

Does Lavelle have any practice quizzes for us or do we only get practice midterms and finals?

CHEMISTRY COMMUNITY

Search found 12 matches

Re: Saying Thank You to Dr. Lavelle

Torsional Strain vs steric strain [ENDORSED]

Common names vs IUPAC

Catalyst

Stoichiometric coefficients

Re: Writing the Cell Diagram for Galvanic Cells

Redox reactions [ENDORSED]

Re: Redox Reactions

Standard enthalpies of formation

Re: Q 8.17

Isothermal systems [ENDORSED]

Practice quiz