CHEMISTRY COMMUNITY

Jenny_Thompson_3I

In most cases, substituents favor the equatorial position because it leads to more stability of the molecule overall. For example, when substituents are in the axial position it can lead to steric strain with the other axial molecules, which makes the structure less stable.

Jenny_Thompson_3I

The final will be from 3pm - 6pm and the rooms will be released soon

Jenny_Thompson_3I

It is because of the fact that the C-Cl bond is polar. Since Cl is negative, the electrons will be more drawn to that atom so a dipole moment will occur. The Cl will be slightly negative and the C will be slightly positive, this is what makes it and electrophile. Since the C carries a slight positiv...

Jenny_Thompson_3I

Many times it depends on the formal charge of the central atom. If the formal charge is negative then the species will be a nucleophile and will be attracted to positively charged particles.

Jenny_Thompson_3I

"Did you know that you can cool yourself to -273.15˚C and still be 0k?" "Helium walks into a bar, The bartender says "We don't serve noble gasses in here." Helium doesn't react." "The optimist sees the glass half full. The pessimist sees the glass half empty. The c...

Jenny_Thompson_3I

You determine the Ecell value from the two half reactions you write from either the cell diagram given or the balanced chemical equation. The formula for calculating the Ecell is E(cathode) - E(anode) and these values you get from the chart of standard E values that is found in the back of the book....

Jenny_Thompson_3I

A salt bridge is when you have two different solutions that are in different beakers while a porous disc is used in a concentration cell in which you have two solutions that are the same but are at different molarities. Also, a porous disc is used when there is only one beaker while a salt bridge is...

Jenny_Thompson_3I

A reaction that is reversible occurs when the external and internal pressures are the same and the system is at equilibrium (for example 1.00 atm), therefore when the system expands it does so when there are extremely small changes in the external pressure that is reestablished when the system expan...

Jenny_Thompson_3I

Since O2 is a diatomic molecule it is impossible to know whether or not the O molecules are changing positions, thus giving us w=1. And the ln(1) is 0, which them means the S=0 so there is no change in entropy.

Jenny_Thompson_3I

For a reaction that is exothermic it will have a negative enthalpy since it is releasing energy. A reaction that is endothermic will have a positive enthalpy since it is absorbing energy.

Jenny_Thompson_3I

To solve this question you are still using an ICE box but you are working backwards in order to find the concentration of HClO. Since you are given the pH you can find the concentration of H3O+ and then use that information to find the concentration of HClO.

Jenny_Thompson_3I

HF is a weak acid due to the fact that it has a short and strong bond. For example HI is a stronger acid due to the fact that it has a large atomic radius and a short bond length, making it easier to break apart. Since HF has a smaller atomic bond it has a longer bond length making it more difficult...

Jenny_Thompson_3I

For this you need to set up the ICE box that was described in the course reader and lecture and the solve for x using the quadratic equation.

Jenny_Thompson_3I

The atoms that are outside the coordination complex do not have any effect on the coordination number. With the example you gave the charge for the coordination complex is +2 and the charge of each K is +1, so the 2 K atoms create an compound with an overall charge of 0. The coordination complex and...

Jenny_Thompson_3I

The difference between bonding and antibonding is determined from whether or not the molecular orbital is in phase or out of phase. In phase will produce bonding while out of phase will produce antibonding. The phase is determined from the molecular wave function that is a linear combination of two ...

Jenny_Thompson_3I

You want the lone pair electrons to be as far away from each other, so for example if you have two sets of lone pairs they would be 180 degrees apart from each other. For just one lone pair, it does not really make to much of a difference where you place the electrons because the lone pair will be a...

Jenny_Thompson_3I

Electronegativity is calculated by using both electron affinity and ionization energy, so it is not a value that is calculated from an experiment. Since it is not a measured quality, it does not have units. Hope this helps!

Jenny_Thompson_3I

Another note to this when you are imputing the velocity into the equation you need to multiply it by 2 due to the fact that there is a +/- sign in front of it. This will account for both the positive and negative uncertainty of the velocity.

Jenny_Thompson_3I

The difference between the d(xy) and d(x^2, y^2) is what axis the orbitals lay on in a three dimensional space. This changes the orientation and direction of the orbital. The x, y, and z axis are used to describe which planes the orbitals lie in.

Jenny_Thompson_3I

Since the wavelength produced by the baseball's movement is so small, there is now way that we can detect this wavelength. The baseball is technically producing a wave, but it is impossible to detect. We are able to detect the wavelike properties of an election due to the fact that it is so small, w...

Jenny_Thompson_3I

The main concept was that Dr. Lavelle said that increasing the intensity of white light (the light source) does not lead to electrons being removed. In order to remove electrons from the metal you must have a light source with a shorter wavelength. Then in your increase the intensity of this shorter...

Jenny_Thompson_3I

I also took AP Chemistry my sophomore year so I would recommend doing this. Going through the homework problems and working them all along with reading the text book. Any questions you have on the homework problems, I would go to office hours and ask the TA/UA for help and he/she can walk you throug...

Jenny_Thompson_3I

Thank you Megan! That was extremely helpful and I though that was the path I should go on so thank you for confirming.

Jenny_Thompson_3I

Are the quizzes that are provided in the Chem Workbook due to our TA's before we take each quiz and can you actually replace a quiz grade from the quizzes taken from the Chem Workbook?

Jenny_Thompson_3I

For problem M.19 I am having trouble figuring out where to start due to the fact that it only gives the amounts of carbon dioxide, water, and nitrogen for the products. Are we to just assume that caffeine is composed of carbon, oxygen, hydrogen, and nitrogen and then work backwards using the masses ...

CHEMISTRY COMMUNITY

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Re: substituents

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Homework Problem M.19 Help