Recent content by kalery

I'm still in Intro Physics, and I'm a little perplexed by the concept of tunneling. An alpha particle escapes the nucleus by overcoming a potential energy barrier created by Coulombic repulsion with the protons of the nucleus, but this is a spontaneous process and does not require E input...

Here's why I think he may have made up the pKa values: The pKa's for phthalic acid (the 1,2-dicarboxylic acid of benzene) are pKa1 = 2.98 and pKa2 = 5.28. What this would mean is that somehow phthalic acid is more acidic than 3-bromo-4-nitrophthalic acid (pKa1 = 3.50), which we know cannot be...

Thank you for responding. I read over these thoughtful replies several times. Interesting comments! I still think the professor's reasoning for his answer is specious and incorrect. Without verifiable published pKa's, it's my word against his *sigh*

Nope. Ionic bonds are stronger than covalent bonds.

Ionic compounds melt at higher temperatures, because it takes more energy to break the crystal lattice structures they form. In general, the stronger and more polar the bonding for the molecule, the higher the melting point.

Homework Statement Two protons have different pKas: 3.50 and 4.25. The molecule is 2-bromo-3-nitrophthalic acid (if I'm naming it correctly). Assign the correct pKa to each proton. http://uploader.ws/upload/200805/pkablank.jpgHomework Equations A lower pKa means a stronger acid, which means...

it's a highly oxidized salt

hmmm

Question 1: part c) H2S is a product, not a reactant. part d) You're missing a chiral center. The 4-position Carbon is chiral for the elimination products. It's not quite symmetrical. bonus looks correct!

On problem #3 you need to convert the mass to kilograms when calculating the mass-per-unit-length in the velocity equation. Your numbers will turn out more reasonable. 22 m/s on a short string seems a bit much :p

The fact that a real image is projected onto the screen in part 1 suggests you have a concave mirror. When an object is placed outside the focal length of the mirror in part 2, the image is real, inverted, and diminished.

On question 1, the sound waves travel to the ocean surface, then travel back to the boat. Going down, gravity acts, which means you need an equation for constantly accelerating motion (y,yo,.5gt^2 etc). Going up, you can apply the simple velocity equation t=d/v. Using this information in...

Hydroxide deprotonates weak acids and hydronium ion alike. In a basic solution, hydroxide abstracts acidic protons from both molecules.

HOFO can be written as a neutral species, I think. H-O-F=O with two lone pairs on Fluorine The central atom of SiCl2Br2 is Si, and its geometry is tetrahedral, with no lone pairs.The electron dot structure is hard to input here, so I'll describe it. C with a single bond (:) to H and a single...

Sulfuric acid acidifies your system and protonates any ammonia that is formed.