Search found 7 matches

by ellienelson4F
Mon Nov 05, 2018 3:08 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm Material
Replies: 3
Views: 109

Re: Midterm Material

I believe Lewis acids and bases will not be tested.
by ellienelson4F
Mon Nov 05, 2018 3:05 pm
Forum: Lewis Structures
Topic: Lewis Structures for Ionic Bonds
Replies: 5
Views: 58

Re: Lewis Structures for Ionic Bonds

I think the reason you put the dots (8 electrons) around the anion and not the cation is to demonstrate which of the atoms has just gained a full shell. It explains the concept of the anion filling its outer shell while the cation has emptied its previously most outer shell.
by ellienelson4F
Mon Nov 05, 2018 3:01 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Alternative version of formula
Replies: 7
Views: 247

Re: Alternative version of formula

You can use both, but make sure you understand why they both work! The "dashes" represent bonds, which in the lecture formula is represented by the /2, so the numbers will come out the same for this reason.
by ellienelson4F
Mon Nov 05, 2018 1:50 pm
Forum: Lewis Structures
Topic: Lewis Structures for Ionic Bonds
Replies: 5
Views: 58

Re: Lewis Structures for Ionic Bonds

A lewis structure for a covalent bond will have shared pairs, of electrons while a lewis structure for an ionic bond will just demonstrate charge and valence electrons. Below is the lewis structure of NaCl, an ionic compound, so you can see the difference.
by ellienelson4F
Mon Nov 05, 2018 1:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Calculator for Midterm
Replies: 2
Views: 87

Re: Calculator for Midterm

Yes, you can have a simple scientific calculator but no graphing calculator. Exam info is on his website, here: https://lavelle.chem.ucla.edu/wp-conten ... ns_14A.pdf
by ellienelson4F
Sun Nov 04, 2018 11:32 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent
Replies: 3
Views: 42

Re: Ionic and Covalent

As a general rule of thumb, an ionic bond is between a metal and a nonmetal, while a covalent bond is between nonmetals. Remember that in an ionic bond one of the atoms will completely transfer an electron to the other in order to become stable (eg. in NaCl the one valence electron in sodium's outer...
by ellienelson4F
Sun Oct 07, 2018 5:52 pm
Forum: Empirical & Molecular Formulas
Topic: HW1 F19
Replies: 2
Views: 63

Re: HW1 F19

The first step of this problem is to assume you have 100g, and then convert each element to moles by dividing whatever the percent (now, grams because you have 100g) was, for example 49.48g C/12.0107g/mol. Once you have converted each element to moles, divide by the smallest number of moles to get w...

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