Search found 11 matches

by Tiffany Chen 3E
Sun Jan 15, 2017 5:35 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Work Done by or on the System [ENDORSED]
Replies: 3
Views: 471

Re: Work Done by or on the System [ENDORSED]

An example of work being done by a system is when the gas is expanding on the piston and it moves outwards.
by Tiffany Chen 3E
Sat Dec 03, 2016 1:28 am
Forum: Calculating the pH of Salt Solutions
Topic: Equations for different types of problems
Replies: 2
Views: 509

Re: Equations for different types of problems

Also, I believe you use the H-H equation for buffers; otherwise the ICE table is used.
by Tiffany Chen 3E
Wed Nov 23, 2016 8:13 pm
Forum: Conjugate Acids & Bases
Topic: Autorpotolysis Note(pg 156 Course Reader)
Replies: 1
Views: 438

Re: Autorpotolysis Note(pg 156 Course Reader)

Autorpotolysis is when a proton is transferred between atoms. For example, when a molecule acting as an acid gives a proton to a molecule acting as a base. For example, take the reaction 2 H2O ----> H3O+ + OH-.
by Tiffany Chen 3E
Fri Nov 18, 2016 9:58 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH
Replies: 1
Views: 260

Re: pH

PoH is used to measure the concentration of hydroxide ions, and we use this scale to solve acid-base equilibrium problems.
by Tiffany Chen 3E
Fri Nov 11, 2016 4:46 pm
Forum: Naming
Topic: HW 17.33
Replies: 1
Views: 326

HW 17.33

For this problem, how do we know which atoms can be used to bind to a metal center? For example, for b) how do we know that we use one or two oxygen atoms to bind to the metal ion?
by Tiffany Chen 3E
Fri Nov 04, 2016 10:05 pm
Forum: Hybridization
Topic: Hybridization for expanded octets
Replies: 3
Views: 867

Re: Hybridization for expanded octets

Typically in hybrid orbitals, isn't it supposed to be written as sp3d? I know that in electron configurations, the d orbital is written before the s and the p. Does this follow the same rule or is it separate?
by Tiffany Chen 3E
Fri Oct 28, 2016 9:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 1
Views: 218

Lone Pairs

In question 4.11 b) of the homework, the solutions manual says it's Tshaped and to ignore the lone pairs on the sulfur. When I did the problem, I took into account that there were lone pairs and got Trigonal Pyramidal. Why do we ignore the two lone pairs?
by Tiffany Chen 3E
Fri Oct 21, 2016 3:25 pm
Forum: Lewis Structures
Topic: Octet Rule Exceptions? [ENDORSED]
Replies: 3
Views: 523

Re: Octet Rule Exceptions? [ENDORSED]

I'm having difficulty understanding the concept of empty d orbitals- I know that from period 3 and on that's when d orbitals come into play but what does it mean when they are empty and how do we determine that?
by Tiffany Chen 3E
Fri Oct 14, 2016 9:24 pm
Forum: Ionic & Covalent Bonds
Topic: Ionization Energy
Replies: 7
Views: 822

Re: Ionization Energy

Yes, the second ionization energy will always be more than the first for every atom because it will take more energy to remove the second electron, since before it is positively charged, making it easier to remove the electron. When it becomes neutral, it's harder to remove the electron.
by Tiffany Chen 3E
Fri Oct 07, 2016 12:26 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: D orbital shapes [ENDORSED]
Replies: 1
Views: 386

D orbital shapes [ENDORSED]

In atomic orbitals, What is the difference between the d (xy) and d (x^2-y^2) shapes, and what does that mean for the orbital?
by Tiffany Chen 3E
Sat Oct 01, 2016 2:32 pm
Forum: Empirical & Molecular Formulas
Topic: Mole Ratio: Whole Number Ratios vs. Decimal Ratios
Replies: 3
Views: 7201

Re: Mole Ratio: Whole Number Ratios vs. Decimal Ratios

You might want to recheck your calculations, when I did this problem mine matched the solutions manual. For example for C- 1.11 mg/12.01 g/mol= .0924 mmol. Divide that by 0.0113 mmol (the mmoles of N which was the smallest number out of the four) gives you 8.18 for C. Multiply that by 6 and you get ...

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