Search found 10 matches

by Alyssa Ishimoto 1A
Tue Mar 14, 2017 4:21 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Homework question
Replies: 2
Views: 348

Re: Homework question

The structure would be trans because the ethyl on the left side of the molecule has priority and the bromo group on the right side of the molecule has priority.
by Alyssa Ishimoto 1A
Thu Mar 09, 2017 3:01 pm
Forum: *Cycloalkenes
Topic: neo vs tert
Replies: 3
Views: 804

Re: neo vs tert

A neo group has three methyl groups at the end and must have at least 5 carbons total. Usually there is a secondary carbon that connects the neo group to the main chain. A tert butyl group is a branching chains that also has three methyl groups but the tertiary carbon connects the three methyl group...
by Alyssa Ishimoto 1A
Wed Mar 01, 2017 5:23 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 & Extra Credit
Replies: 2
Views: 395

Re: Quiz 3 & Extra Credit

Quiz 3 will entail the part of kinetics that was not covered in quiz 2. Catalysts, enzymes, the Arrhenius equation will be included in quiz 3. Quiz 3 will also include the section of organic chem we have learned so far.
by Alyssa Ishimoto 1A
Wed Feb 22, 2017 6:36 pm
Forum: *Electrophiles
Topic: Electrophiles and nucleophiles
Replies: 3
Views: 422

Re: Electrophiles and nucleophiles

Electrophiles "love" electrons so they are missing a lone pair of electrons or one electron and therefore want to gain electrons to get a complete shell. Nucleophiles "love" positively charged nuclei. They have a lone pair of electrons and want to donate these electrons.
by Alyssa Ishimoto 1A
Wed Feb 15, 2017 10:33 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: When do you add Pt?
Replies: 3
Views: 451

Re: When do you add Pt?

You add Pt(s) when the half reaction has no solid metal that can conduct electricity. If the half reaction contains Ag(s) or Zn(s), then those solid metals act as the electrode. However, if the half reaction contains no solids, then you add Pt(s). In addition, if the half reaction has a nonconductin...
by Alyssa Ishimoto 1A
Tue Feb 07, 2017 2:27 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams/Salt Bridge
Replies: 2
Views: 302

Re: Cell Diagrams/Salt Bridge

The double line can be used to denote a salt bridge or a porous bridge. It shows that the two half reactions are separated.
by Alyssa Ishimoto 1A
Mon Jan 30, 2017 7:57 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Spontaneity
Replies: 4
Views: 633

Re: Spontaneity

Work is done on the system when the system gains energy. For example, when a gas is compressed by a piston, work is being done on the system. Work is done by the system when the system loses energy. For example, when a gas expands against a piston, work is being done by the system.
by Alyssa Ishimoto 1A
Tue Jan 24, 2017 1:09 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Ch 8 Exercise 77
Replies: 3
Views: 497

Re: Ch 8 Exercise 77

A kekule structure of benzene shows that benzene is a ring with alternating double and single bonds between the carbon atoms and single bonds between the hydrogen atom and carbon atom. Resonance causes the bonds between the carbon atoms to be single bonds 50% of the time and double bonds the other 5...
by Alyssa Ishimoto 1A
Wed Jan 18, 2017 10:28 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units [ENDORSED]
Replies: 5
Views: 700

Re: Units [ENDORSED]

You must always use kJ/mole for standard enthalpy of formation because it is the formation of 1 mole of a compound from its elements. But you can use KJ for reaction enthalpy.
by Alyssa Ishimoto 1A
Wed Jan 11, 2017 4:46 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Standard Enthalpy of Formation
Replies: 1
Views: 267

Re: Standard Enthalpy of Formation

Standard enthalpy of formation for elements in their most stables form is zero so you are correct. Therefore, since graphite is the most stable form of carbon and gaseous hydrogen and gaseous oxygen are also the most stable forms, the only change in enthalpy of the reaction would be ethanol.

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