Search found 9 matches

by Charlotte Shieh 1F
Wed Nov 08, 2017 6:52 pm
Forum: Lewis Acids & Bases
Topic: Lewis Acids and Bases
Replies: 2
Views: 225

Lewis Acids and Bases

In the textbook, Lewis acids and bases don't appear till Ch. 12, but Dr Lavelle mentioned them in lectures. I was wondering whether we'd be expected to know about them for the midterm?
by Charlotte Shieh 1F
Wed Nov 08, 2017 6:32 pm
Forum: Octet Exceptions
Topic: Radical Lewis Structures
Replies: 4
Views: 980

Re: Radical Lewis Structures

Just to add, when drawing the lewis structure you place the unpaired electron on the atom which is more electronegative.
by Charlotte Shieh 1F
Wed Nov 08, 2017 6:27 pm
Forum: Dipole Moments
Topic: Drawing dipole moments [ENDORSED]
Replies: 3
Views: 357

Drawing dipole moments [ENDORSED]

Would we be required to draw dipole moments in questions where we are asked to draw the lewis structure of a molecule?
by Charlotte Shieh 1F
Sun Oct 29, 2017 10:43 pm
Forum: *Shrodinger Equation
Topic: Significance of Schrodinger's Equation [ENDORSED]
Replies: 1
Views: 239

Significance of Schrodinger's Equation [ENDORSED]

I understand that Ψ^2 represents the electron density distribution and hence allows us to find the probability of an electron occurring, but what exactly is the significance of the original wave function (HΨ=EΨ)? What does it help us find/calculate?
by Charlotte Shieh 1F
Sun Oct 29, 2017 10:27 pm
Forum: Trends in The Periodic Table
Topic: Factors Affecting Energy of an Electron
Replies: 3
Views: 471

Re: Factors Affecting Energy of an Electron

A factor that affects electron energies in multi-electron atoms would be shielding. So an electron in an outer shell would experience reduced electrostatic attraction (effective nuclear charge), as inner electrons would shield electrostatic attraction between the positive nucleus and the outer elect...
by Charlotte Shieh 1F
Tue Oct 17, 2017 4:57 pm
Forum: Properties of Light
Topic: Color of visible light
Replies: 11
Views: 684

Color of visible light

If an atomic spectra lies within the visible light spectrum (Balmer series), would we be expected to know what color light it is?
by Charlotte Shieh 1F
Tue Oct 17, 2017 4:49 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Why don't we use the Rydberg equation from the book?
Replies: 8
Views: 437

Re: Why don't we use the Rydberg equation from the book?

Dr Lavelle hasn't talked about similar equations for other atoms, and we wouldn't be expected to know them, at least at our current level.
by Charlotte Shieh 1F
Sat Oct 07, 2017 12:25 am
Forum: SI Units, Unit Conversions
Topic: Significant Figures [ENDORSED]
Replies: 9
Views: 926

Re: Significant Figures [ENDORSED]

Generally, you would round significant figures according to the value given in the question. For example, if the question gives you 3 sig figs, you would round your percentage to 3 sig figs. If there are 2 values in the question, you would choose the one with the least number of sig figs to base you...
by Charlotte Shieh 1F
Thu Oct 05, 2017 4:34 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E.15 [ENDORSED]
Replies: 10
Views: 941

Re: E.15 [ENDORSED]

you find what the metal M is by subtracting the molar mass of (OH)2 from 74.10. you will find that M is calcium, so you just have to calculate the molar mass of CaS (which is the sulfide of the metal)

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