CHEMISTRY COMMUNITY

Shelby Slaughter 3D

I would assume its identical to the formula sheet in the course reader before the practice exams, see page 125

Shelby Slaughter 3D

The Carbon atoms in cyclobutane, unlike cyclopropane, can rotate to stagger the hydrogen atoms and relieve torsional strain. Cyclopropane must be planar, and cyclobutane takes a butterfly confirmation because it is more stable this way than as planar.

Shelby Slaughter 3D

its the number of the carbon in the parent chain that the chlorine of butanol is attached to

Shelby Slaughter 3D

The Introduction to Organic Chemistry text keeps referring to carbocations in Chapter 4. What exactly are these?

Shelby Slaughter 3D

Will we need to know the details of radioactive decay?

Shelby Slaughter 3D

Standard reduction potentials measure the potential difference between two electrodes. If the electrodes are made of the same material there is no difference. The different concentrations of the solutions only affect E cell, not standard E cell. See the diagram on page 53 in the course reader.

Shelby Slaughter 3D

To calculate K the concentration of products must be over concentration reactants. For Ka calculations the H+ concentration value must be on top, so in order to get an total equation producing H+ the equation containing HF must be the anode, even though standard Ecell is negative and therefore not f...

Shelby Slaughter 3D

For 14.9a Ce goes from having a charge of +8 to +6, therefore n=2 (be careful to notice stoichiometric coefficients!)

Shelby Slaughter 3D

But if 0K was reached would the residual entropy theoretically be zero, or still just infinitely small?

Shelby Slaughter 3D

What does the answer of this question mean when it says that "it would be possible for the molecule to be disordered"?

Shelby Slaughter 3D

I believe that Hc is the standard enthalpy of combustion, or the enthalpy change per mole of something burned during combustion. So, I would say it is used for combustion reactions. However, I am unsure if reactants and products must be in standard state. The text book only say "under standard ...

Shelby Slaughter 3D

Hf is for standard enthalpy of formation which is the standard reaction enthalpy for forming one mole of a substance from its elements, but only when its elements are in their most stable form. Where have you seen Hc??

Shelby Slaughter 3D

Yes you are correct, they are both kj/mole as it states in our course reader.

Shelby Slaughter 3D

The same reaction is used in question 12.65, I was wondering why it is (h20)6? Why not 5 or 4 or even 3?

Shelby Slaughter 3D

I've heard that it stands for potential, but other sources say it was just chosen at random. Here is a short article about it.http://cultureofchemistry.fieldofscienc ... ds-ph.html

Shelby Slaughter 3D

Ligands are supposed to be arranged alphabetically so aqua comes before oxalato!

Shelby Slaughter 3D

Unless questions in the homework and the practice quizzes require this knowledge, which I do not believe they do, we do not have to worry about it!

Shelby Slaughter 3D

The oxidation state of Oxygen is -2 , and since there are three oxygen the overall charge of oxygen in this molecule is -6. Because there are two thallium atoms their charges must each be +3 each to balance the oxidation states.

Shelby Slaughter 3D

I was wondering if we are able to check quiz grades online? I can't find a CCLE link and the grades section on myUCLA is blank.

Shelby Slaughter 3D

I heard they're starting a whole new chem channel devoted to as xenon tv products.

Shelby Slaughter 3D

Are pencils or pens preferred on quizzes?

Shelby Slaughter 3D

As to your first question, be sure to stick to the greater than or equal to symbol unless the minimum is asked for, otherwise it could result in lost points. But to your second question you are correct, for example if a problem listed plus or minus six the uncertainty would be tweleve.

Shelby Slaughter 3D

First, you see in example m4 that the mystery compound contains only Carbon, Hydrogen, and Oxygen. The goal is to find the amount of each of these elements (moles). In terms of variables you need to use the mass of carbon dioxide produced and its molar mass to find the moles of CO2 (n= m/M). Once yo...

Shelby Slaughter 3D

In the audio visual module Professor Lavelle posted about empirical and molecular formulas he mentioned that a 3.89 would be fine to round up to 4 but a decimal more like 3.75 would signal that you need to multiply by something else (four). I would say 3.87 is close enough to 4 to be rounded. Usuall...

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