CHEMISTRY COMMUNITY

Diana_Visco_1l

n = total # of e- transferred in the redox reaction.
Fe2+ goes to Fe ----- 2 e- are transferred, but there are 2 moles, so 2X2= 4.
n= 4

Diana_Visco_1l

n = total # of e- transferred in the redox reaction.
Fe2+ goes to Fe ----- 2 e- are transferred, but there are 2 moles, so 2X2= 4.
n= 4

Diana_Visco_1l

All the Newman Projections we have done thus far have been a between TWO carbon atoms. The other carbon atoms are considered if they are bonded to the carbon atoms we are examining. They are drawn on the outside of the circle, whereas the carbon atoms being specifically analyzed are in the center of...

Diana_Visco_1l

Ensure that you are focussing on the "priority rules," in regards to breaking apart double bonds and giving precedence to elements with higher atomic #. Also looking at the line structure and where H atoms are bonded helps establish the geometry and provides a visual representation of wher...

Diana_Visco_1l

This thought process works if the described alcohol is an alkane (only single bods present). If the molecule is an alkene (double bond) then, the before the suffix of the alcohol, you must indicate where the double bond is located. This is because an alcohol isn't a terminal atom, numbers are vital ...

Diana_Visco_1l

Some simple, yet enjoyable jokes:

Every dipole has its moments.

It takes alkynes to make a world!

Diana_Visco_1l

According to IUPAC, double bonds and triple bonds take precedence in the order of which the structure is named (this is an exception where alphabetical order doesn't appear).

Diana_Visco_1l

Making bad chemistry jokes because all the good ones Argon...

Diana_Visco_1l

The rate of adsorption is governed by the rate of arrival of molecules at the surface and the proportion of incident molecules which undergo adsorption. The rate of adsorption (per unit area of surface) as a product of the incident molecular flux, F , and the sticking probability , S . R(ads) = S . ...

Diana_Visco_1l

The larger this ratio, the smaller the rate (hence the negative sign.) This means that high temperature and low activation energy favor larger rate constants, and thus speed up the reaction. And because these terms occur in an exponent, their effects on the rate are quite substantial. Therefore, tem...

Diana_Visco_1l

Zero order: mol/s
First Order: s^-1
Second Order: L * mol^-1 * s^-1
Third Order: L^2 * mol ^-2 * s^-1

Diana_Visco_1l

SHORT BUT SWEET...

How about the chemical workers… are they unionized?

Diana_Visco_1l

How many grams of water can be heated from 25.0 degrees Celsius to 100 degrees Celsius by the heat released from converting 49.7g of PbO to Pb? The converting reaction is: PbO(s) + C(s) --> Pb(s) + CO(g) deltaH = -106.9kJ How do I go about setting up this problem in order to solve it? q = (n)ΔH (49...

Diana_Visco_1l

When discussing the relationship between entropy in regards to the stability of a system, when a maximum heat source is reached, the point can be considered "stable." The state of maximum thermodynamic stability is reached when entropy is maximized and enthalpy is maximized.

Diana_Visco_1l

Q: What do you get when you mix sulfur, tungsten, and silver?
A: SWAG

Diana_Visco_1l

A coffee cup calorimeter occurs at constant pressure because it is exposed to the atmosphere, because it is partially unsealed. Therefore, volume is allowed to fluctuate. In contrast, a bomb calorimeter, occurs at constant volume and pressure is allowed to fluctuate because it is completely sealed f...

Diana_Visco_1l

An irreversible process occurs due to the finite gradient between the two states of a particular system. In the irreversible process the initial state of the system and surroundings cannot be restored from the final state and increases decisively and it cannot be reduced back to its initial value. A...

Diana_Visco_1l

It helps to think of a sigma bond as a single bond and a pi bond as a double bond.

Diana_Visco_1l

The bond order is 2.5 and not enough for triple bond. Thus the molecule will have a double bond and is a table molecule.
* Bond order is a special relationship for Bond length (thus strength)

Diana_Visco_1l

The bar is the metric unit of pressure. 1 bar = 100,000 Pascal. 1 atm = 1.01325 bar.

Diana_Visco_1l

When Kc>1 you can also say that kforward>kreverse and inversely if Kc<1 then k reverse>k forward. To favor either the reactants or the products in equilibrium is to say the formation of either the reactants or products is favored, as indicated by the rate constants. If a reaction is not at equilibri...

Diana_Visco_1l

Okay so... (en)2 = 0 charge. (CN) = -1 charge (Cl) = -1 charge (Cl) = -1 Charge. By addition, you get: -1 + -1 + -1 = -3. The compound as a whole is not an ion (not a cation or anion)so it has a neutral charge of 0. In this case to make this compound 0, the metal has to have an oxidation number of 3...

Diana_Visco_1l

The sodium atom on the outside of the parenthesis accounts for a charge of 1+. The ammine is 0 and the Chlorine is -3 ( -1 x 3 atoms). And because the compound is not an ion, you know the total number of oxidation numbers must equal zero (neutral). So... 1 + 0 -3 + x = 0. SOLVE FOR X (oxidation numb...

Diana_Visco_1l

Here's a very witty, yet simple humorous joke for your afternoon.

Diana_Visco_1l

Follow these steps. 1) Find lewis structures for all ions. 2) Ensure you draw structures correctly. 3) Examine the type of bonds being formed (i.e. single, double, triple, etc). Note: The more bonds that appear between two atoms/ions, the more energy is present, and the closer the pull of electrons ...

Diana_Visco_1l

To add on...Molecular orbital theory allows us to understand the probability of finding the electrons at particular points around the molecule. MO Theory also allows us to understand bond order which is significant for the understanding of reactivities. Prior to learning about MO, we learned about t...

Diana_Visco_1l

When analyzing the ionic character of a compound its important to realize the electronegativity difference between the elements in the compound. For example, C has an electronegativity is 0.8. Where C (2.6 EN) - O (3.4 EN) = 0.8 EN. The same thing goes for CS2 = C (2.6 EN) - (2.6) = 0. The greater t...

Diana_Visco_1l

In regards to resonance structures, what factors determine which atoms/ions exhibit the greatest resonance stabilization?

Diana_Visco_1l

When solving problems for wavelength, yes its important to understand what the question's units contain, it's important to understand the SI unit system. When using the speed of light formula, and Broglie formula the standard SI unit is m. Thus, you must convert your wavelength (if given in nm) to m...

Diana_Visco_1l

To all those chemists that have been agitated by atoms...

Don't trust atoms, they make up everything.

- Your Fellow Chemistry Student,
Diana Visco

Diana_Visco_1l

HI, in response to your question...To better understand the periodic table and trends, it is extremely helpful to know the name of common compounds and polyatomic ions. A few resources that have helped me over the few years when I have taken chemistry, include resources like Kahn Academy, Fernbank.e...

CHEMISTRY COMMUNITY

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Re: Winter 2013 Final Q4

Re: Winter 2013 Final Q4

Re: Newman Projection

Re: Z and E how to tell the difference

Re: Numbering alcohols

Re: Post All Chemistry Jokes Here

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Re: Activation Energy

Re: Units of rate constant k

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Re: Quiz 1 Preparation Answers (#11)

Re: Entropy and Stability

Re: Post All Chemistry Jokes Here

Re: Calorimeters [ENDORSED]

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Re: Determining Oxidation [ENDORSED]

Re: Naming coordination compounds

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Re: Bond length, 2012 Midterm Question 6B

Re: What is MO theory for? [ENDORSED]

Re: CO2 vs. CS2 ionic character

Re: Electrons in Resonance [ENDORSED]

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Re: How familiar should we be with Naming compounds? [ENDORSED]