Search found 15 matches

by Jacqueline Zhang 2A
Sun Mar 06, 2016 3:39 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetics vs. Thermodynamics
Replies: 1
Views: 456

Kinetics vs. Thermodynamics

How do you know whether a reaction is under thermodynamic or kinetic control? for thermodynamic is it based on stability of the products? and for kinetics is it based on the rate of product formation? How does temperature affect them?
by Jacqueline Zhang 2A
Sun Feb 28, 2016 11:34 pm
Forum: *Nucleophiles
Topic: Ambident Nucleophile
Replies: 2
Views: 442

Re: Ambident Nucleophile

An ambident nucleophile is a molecule that can act as a nucleophile attacking from two or more different sides. For example, SCN− (thiocyanate) can act as a nucleophile with either the S or the N attacking.
by Jacqueline Zhang 2A
Tue Feb 23, 2016 9:49 am
Forum: *Nucleophiles
Topic: Determining nucleophilicity
Replies: 5
Views: 886

Re: Determining nucleophilicity

As you go across the periodic table row, nucleophilicity decreases (electronegativity)
and as you go down a column, nucleophilicity increases.
by Jacqueline Zhang 2A
Sat Feb 06, 2016 2:34 pm
Forum: Balancing Redox Reactions
Topic: Oxidation Numbers
Replies: 3
Views: 410

Re: Oxidation Numbers

1. Free elements are have oxidation number of 0 (ex: H2, O2, F2, Br2, I2, Cl2 mentioned in the first reply) 2. For ions, it is the charge 3. Oxygen is -2 and Hydrogen is +1 4. For neutral compound, the sum is 0 so you can apply the rules listed above and solve for the oxidation number of the element...
by Jacqueline Zhang 2A
Sun Jan 24, 2016 2:28 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Determining Higher Molar Entropy 9.27
Replies: 2
Views: 506

Re: Determining Higher Molar Entropy 9.27

For comparing molar entropies between gases:
Check which one has greater mass (the greater the mass of the molecules, the closer together are the energy levels)
or
Larger and more complex molecules have higher molar entropies than smaller/simpler ones
by Jacqueline Zhang 2A
Sat Jan 09, 2016 11:14 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Molar Heat Capacities
Replies: 1
Views: 304

Molar Heat Capacities

Why is it that gases have two molar heat capacities while liquids and solids only have one molar heat capacity?
by Jacqueline Zhang 2A
Thu Dec 03, 2015 1:22 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Application of Electronegativity to Acid Strength
Replies: 3
Views: 519

Re: Application of Electronegativity to Acid Strength

Why is the stability of the conjugate base important for the strength of an acid?
by Jacqueline Zhang 2A
Wed Nov 18, 2015 3:46 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1360234

Re: Chemistry Jokes

Why is the pH of Youtube so stable?


Because it constantly buffers.
by Jacqueline Zhang 2A
Sun Nov 15, 2015 3:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Draw Out Examples of Polydentates?
Replies: 1
Views: 382

Draw Out Examples of Polydentates?

I was wondering if anyone could draw examples of how a bidentate, tridentate, and a hexadentate would look like? I'm having trouble visualizing how they look like.
by Jacqueline Zhang 2A
Mon Nov 02, 2015 11:04 pm
Forum: Limiting Reactant Calculations
Topic: Fall 2010 Midterm Question 1B
Replies: 3
Views: 435

Re: Fall 2010 Midterm Question 1B

How do you calculate how much of B is used and the maximum amount of product that can be produced for this question?
by Jacqueline Zhang 2A
Mon Oct 26, 2015 5:12 pm
Forum: Hybridization
Topic: Quiz 2 Material
Replies: 2
Views: 571

Re: Quiz 2 Material

The website says

(10/19/2015)
Quiz 2 covers Chapters 3 and 4 (up to and including hybridization).

under announcements so it seems like molecular orbital theory will not be on the quiz
by Jacqueline Zhang 2A
Sun Oct 18, 2015 7:46 pm
Forum: Lewis Structures
Topic: Halogens
Replies: 1
Views: 381

Halogens

What are bridging bonds? Why is it that halogens form bridging bonds?
by Jacqueline Zhang 2A
Sun Oct 11, 2015 4:14 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect - Properties of Particles
Replies: 2
Views: 672

Photoelectric Effect - Properties of Particles

How does the photoelectric effect show that electromagnetic radiation has the properties of particles?
by Jacqueline Zhang 2A
Sat Oct 03, 2015 4:54 pm
Forum: Empirical & Molecular Formulas
Topic: Tips on Rounding?
Replies: 3
Views: 527

Tips on Rounding?

If I can't multiple anything to make the decimal number a full number, is it fine to just round?
Ex: Would 15.287 be fine as 15? Or would that be inaccurate?

Could anyone list some some common multiples I could use to multiple with the decimal number to get a full number?

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