January 30, 2017

To check which bond is most polar, you must first find an electronegativity table (easily found by googling). You will then identify 2 atoms that make the bond, and find their electronegativity difference. Whoever has the highest electronegativity difference, is most polar.

Ex: Which bond is most polar H-Cl or C-Br?

Answer: H-Cl because it's electronegativity different is 3-2.1=0.9 which is great then that for C-Br (2.8-2...

January 28, 2017

How many HNMR signals does cyclohexane have?

January 26, 2017

3 Ways to make your studying more productive: 1. Use different resources. Use a combination of textbook, youtube videos, and google. When you learn material from different resources, you are able to understand this material broadly and in different scenarios.

January 24, 2017

Which atom has the greatest attraction for the electrons in a chemical bond? (1) hydrogen (2) oxygen (3) silicon (4) sulfur

January 23, 2017

1. Simple things can make us happy! A sunny day, a cloud shaped like Mickey Mouse, yummy snack, funny movie, and playing in the snow! To be happy we don't need anything too complicated. 2. Spend time doing things we love. Why not? There is only one life and we should enjoy it. Children draw beautiful pictures, dance and watch cartoons. We should spend less time worrying about tomorrow and more time enjoying today,...

January 19, 2017

What is the electron configuration of an ion needed for DNA Polymerase to work properly? A. [Ar]4s2 B. [Ne] 3s2 C. [Ne] D. [Ar]3d10

January 18, 2017

Which two elements have the most similar chemical properties? (1) beryllium and magnesium (2) hydrogen and helium (3) phosphorus and sulfur (4) potassium and strontium

January 16, 2017

CHASM: Charge, Hydrophobicity or solubility, Affinity, Stability, and Molecular weight or size.

C- charge – Ion Exchange Chromatography

Cation and Anion Exchange: charged beads get attached to the proteins of the right charge

H: Salting out: Hydrophobicity

When you add salt such as NaCl to a solution of protein and water, eventually protein will precipitate out. The more hydrophobic protein the less salt it needs to precipi...

January 13, 2017

The question about saturation of molecules is asked very often on organic chemistry exams. It is a very easy one to answer! A saturated molecule has all single bonds. An unsaturated molecule has double bonds or triple bonds.

Therefore, alkanes are always saturated while alkenes and alkynes are always unsaturated.

Saturated hydrocarbons, due to the lack of double and triple bonds, can pack very well. That is why butter is...

January 11, 2017

The weight of H2SO4 (molecular weight 98.1) in 50.0 milliliters of a 6.00-molar solution is

(A) 3.10 grams
(B) 12.0 grams
(C) 29.4 grams
(D) 294 grams
(E) 300. grams

Answer:

Molarity= moles of solute/Liters of solution

We plug in molarity and volume (convert ml to L by dividing by 1000), to get 6M = moles/ 0.05L

moles = 0.3 moles of H2SO4

Now, we have to cover moles to grams

0.3 moles of H2SO4 ( 98.1 grams/mole) = 29.43 grams.

...

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