## Search found 20 matches

Sun Mar 18, 2018 11:04 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetically controlled reactions
Replies: 2
Views: 291

### Re: Kinetically controlled reactions

To my understanding, if a product has low activation it is the kinetic product. Whereas if it had higher activation energy, it'd be the thermodynamic product and favored under thermodynamic control.
Sun Mar 18, 2018 9:28 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8023
Views: 1404277

### Re: Post All Chemistry Jokes Here

What do you call a tooth in water?

A molar solution.
Sun Mar 18, 2018 2:01 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Maximum Work
Replies: 3
Views: 372

### Re: Maximum Work

I'm not sure how to mathematically prove it, but delta G is supposed to represent the maximum amount of work possible at constant pressure and temperature. Because G = H-TS = U+PV-TS.
Sun Mar 18, 2018 1:34 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Value of “k” in Kinetics
Replies: 5
Views: 447

### Re: Value of “k” in Kinetics

If k is greater than 1, the products would be favored, while if k is less than 1, the reactants would be favored. That is because k is products/reactants.
Sun Mar 18, 2018 1:31 am
Forum: Experimental Details
Topic: Activated Complex vs. Transition State
Replies: 2
Views: 1301

### Re: Activated Complex vs. Transition State

To my understanding, the activated complex is referring to all possible intermediate molecules. The transition state is the intermediate with highest potential energy.
Sun Mar 18, 2018 1:19 am
Forum: Phase Changes & Related Calculations
Topic: Energy from constant pressure versus constant volume RXN
Replies: 2
Views: 266

### Re: Energy from constant pressure versus constant volume RXN

I'm not sure what you mean by energy coming from a reaction, but to my understanding when the volume is changing energy would be used in the expansion. So, less energy would be coming out from that.
Sun Mar 18, 2018 1:10 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Replies: 5
Views: 525

I believe you are correct, as to my understanding energy in this process is only transferred as work.
Wed Feb 28, 2018 11:02 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: 15.17 a [ENDORSED]
Replies: 3
Views: 239

### Re: 15.17 a[ENDORSED]

How I think this is done, is that you must first isolate [A], [B], and [C]. For example, starting with experiments 1 and 4, you see that the initial rate is the same, 2.0, and [A] and [B] remain the same between the experiments, however [C] changes and is independent of the initial rate. This means ...
Wed Feb 28, 2018 8:05 am
Forum: First Order Reactions
Topic: Half-life of first order reactions [ENDORSED]
Replies: 4
Views: 321

### Re: Half-life of first order reactions[ENDORSED]

To my understanding, half-life doesn't change because the rate it's getting rid of a substance is proportional to the amount. So, if there's more of a substance then it'll dissipate at a faster rate. Zero-order reaction, on the other hand, I think eliminates a given amount of a substance at interval...
Sun Dec 10, 2017 10:19 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Cl -2
Replies: 2
Views: 226

### Re: Cl -2

Those are just two different ways of writing the same thing, to my understanding. You're still ending with 4s^1, one way is just summarized more at the beginning.
Thu Dec 07, 2017 8:24 pm
Forum: Amphoteric Compounds
Topic: Is water both amphoteric and amphiprotic? [ENDORSED]
Replies: 2
Views: 688

### Re: Is water both amphoteric and amphiprotic?[ENDORSED]

To my understanding, water is amphiprotic because it can donate a proton. It can also act like an acid or base making it amphoteric as well.
Thu Dec 07, 2017 2:04 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Isoelectrinic
Replies: 2
Views: 256

### Re: Isoelectrinic

To my understanding, isoelectronic ions are ions with the same number of electrons. For example, F- and Na+ as they both have 10 electrons.
Wed Dec 06, 2017 12:18 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.5
Replies: 4
Views: 382

### Re: 4.5

First off, assuming you had no problem creating the Lewis Structure, you'd see that Cl is the central atom with two double bonds to each O, and one lone e- pair. This shows that there are three e- densities around Cl, and they want to be as far apart as they can from one another. The shape that woul...
Wed Dec 06, 2017 12:07 am
Forum: Ionic & Covalent Bonds
Topic: 3.29
Replies: 2
Views: 443

### Re: 3.29

Coulombic Attraction is the attractive force between any two oppositely charged atoms. To determine which is the strongest, simply multiply the charges on the two atoms to see which is greater. For example, Ga^3+, O^2- would require multiplying 3 x 2 = 6. You can follow these steps with the other tw...
Tue Dec 05, 2017 11:40 pm
Forum: Hybridization
Topic: sp3 hybridization
Replies: 6
Views: 532

### Re: sp3 hybridization

To my knowledge, having lone pairs does not change the sp3 hybridization as long as the intended shape is still tetrahedral. H2O, for example, is in a bent shape but has the electron pairs needed to attempt a tetrahedral shape, and it is sp3 hybridized.
Mon Dec 04, 2017 10:31 pm
Forum: Identifying Acidic & Basic Salts
Topic: 12.65
Replies: 1
Views: 297

### Re: 12.65

To my understanding, KF is basic because F- is an exception, being the only halogen that can affect the pH of a solution. I believe this is because F- can form stronger bonds than say Br, even though they are in the same group. My knowledge ends here though, if anyone has a better explanation.
Mon Dec 04, 2017 10:13 pm
Forum: Amphoteric Compounds
Topic: 12.17 part b
Replies: 3
Views: 430

### Re: 12.17 part b

When you drew out the structure, you saw that there are 3 double-bonds between S and the O's. To my understanding, because these bonds are between atoms of different electronegativity, SO3 will act as a Lewis Acid. When exposed to an appropriate Lewis Base, one pi-electron pair should shift towards ...
Mon Dec 04, 2017 10:02 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 11.73 d
Replies: 2
Views: 210

### Re: 11.73 d

To my understanding, when pressure increases then equilibrium shifts to the side with the least moles of gas. So, one mole of Cl2 versus two moles of Cl. Cl2 would be favored, I believe.
Thu Nov 09, 2017 4:06 pm
Forum: Lewis Structures
Topic: Structure of C2H3N [ENDORSED]
Replies: 2
Views: 2078

### Structure of C2H3N[ENDORSED]

When I attempted to draw this, I put two double bonds on a C, so it looked like C=C=N for that part of the structure. I was told a triple bond between the C and N would be preferred, removing the double bond between the C's. Is this a general rule that an atom doesn't want multiple double bonds to o...
Sat Oct 14, 2017 2:57 pm
Forum: Photoelectric Effect
Topic: general curiosity about atom stability [ENDORSED]
Replies: 2
Views: 243

### Re: general curiosity about atom stability[ENDORSED]

To my understanding, for the first part of your question, the most stable state of an atom is indeed n=1 which is also called the ground state, when their energy level is lowest.