Donald asks…
ORGANIC CHEM HELP!! DRAWING STEREOISOMERS!!! I’m stressing out :/?
Draw all possible stereoisomers for each of the following compounds. If no stereoisomers are possible, only draw one structure. (All hydrogen atoms are implied. If a chiral carbon atom is attached to a hydrogen atom, you should not show the hydrogen atom but use either a wedge or dashed bond and two sticks to establish stereochemistry where appropriate.)
(b) 4-bromo-2-pentene
(c) 2-bromo-4-chloropentane
(d) 3-chloro-1-butene
(e) 1-bromo-4-chlorocyclohexane
(f) 1,2-dimethylcyclopropane
I understand how chiral carbons work, but I don’t understand why I’m wrong when I make different chains with the dotted and wedged alternating on the chiral carbon…
PLEASE PROVIDE PICTURES!
admin answers:
There should be 4 isomers. 1. Trans double bond and the bromine in the R configuration. 2. Trans double bond and the bromine in the S configuration. 3. Cis double bond and the bromine in the R configuration. 4. Cis double bond and the bromine in the S configuration .
Daniel asks…
Determine Kintetic Energy with given Distance?
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Determine Kinetic Energy?
According to a model of the hydrogen atom, and electron orbits a proton. Assume the distance between the electron and proton is 0.5nm. determine the electron’s kinetic energy at point E*?
*Since there is no picture, “point E” is, if you were looking at a circle with a nucleus in the middle, E would be the very bottom of the circle, directly under the “nucleus.”
Answer: 2.3×10^(-19)J
I just need to know how I would go about doing the problem.
Thank you so much!
admin answers:
The force of attraction between the electron & proton “kqq/r^2″ equals the centripetal force “mv^2/r”
mv^2/r = kq^2/r^2
mv^2 = kq^2/r
Where “m” is the mass of the electron.
The kinetic energy is;
KE = (1/2)mv^2
So replacing the “mv^2″ gives;
KE = kq^2/2r
The location would be important if gravity was a significant force, but its miniscule compared to the electric force, so the location of point “E” is not important.
Carol asks…
Science help!!?
5: What is the bond between two non-metals called?
Covalent Bond.
Hydrogen Bond.
Ionic Bond.
6: What force bonds the nucleus together?
weak force
strong force
electronegativity
7: What is an atom?
A very basic unit of matter.
The scientists are still experimenting to find an answer.
It can’t be divided any further.
8: What is the name of the predicted gravity force carrier particle?
Newtonium
Gravitator
Graviton
9: Who identified the electron?
John Dalton
Antoine Lavoisier
Joseph John “JJ” Thomson
10: What is a common picture of model of an atom?
Similar to a bagel
An amorphous blob of protoplasm
Similar to a tiny solar system
11: Carbon has 2 electrons in its first shell. How many are in the second shell?
4 electrons
6 electrons
8 electrons
12: Water is a ____type of bond.
Non-Polar bond
Polar Covalent Bond
Ionic Bond
admin answers:
5. Covalent Bond
6. All of the bound protons and neutrons in an atom make up a tiny atomic nucleus, and are collectively called nucleons. The nucleons are bound together by a short-ranged attractive potential called the residual strong force.
7. A very basic unit of matter. It can be broken down into various particles like neutrons, protons etc. But they cannot exist isolated. Hence atom is the basic unit of matter.
8. Graviton
9. Joseph John “JJ” Thomson. If u check the source provided by me, the name given is G. Johnstone Stoney. But just read on for around 4 – 5 lines and u wil see the name Joseph John “JJ” Thomson.
10. Similar to a tiny solar system. The sun represents the nucleus, the planets represent electron and the orbits of planets represent orbits of electrons.
11. Carbon has an atomic no. Of 6.
Since 2 are in 1st shell completing a duplet. Hence there are 4 electrons in the outer shell or 2nd shell needing four more electrons to complete the octet.
12 Polar Covalent Bond
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