Search found 15 matches

by Mohamad 1J
Fri May 04, 2018 4:26 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2.37
Replies: 2
Views: 81

Re: 2.37

So Zeff can be measured by Zeff = Z - S with Z being the atomic # and S being the number of inner shell electrons. That is why a) is false because the number of electrons will determine the Zeff. As for electron penetration, that is just saying how close an electron can get to the nucleus. Although ...
by Mohamad 1J
Fri May 04, 2018 4:05 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Cr and Cu exceptions
Replies: 3
Views: 116

Re: Cr and Cu exceptions

Yes, we do see that elements in same groups as Cr and Cu follow that same rule, or at least for n=5 level. Because we see that the electron configuration for Ag is [Kr] 4d^10 5s^1 instead of [Kr] 4d^9 5s^2. As for this happening in p orbitals, I am pretty sure that it is only possible for the d orbi...
by Mohamad 1J
Fri May 04, 2018 3:52 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chromium and Copper Electron Configurations
Replies: 2
Views: 710

Re: Chromium and Copper Electron Configurations

For the ground state of Chromium and Copper, we write the configuration as 3d^5 4s^1, and 3d^10 4s^1 respectively. This is because it is more stable with a half full or full 3d shell and a half full 4s shell then it would be with an almost half full or full 3d shell and a full 4s shell. As for ions,...
by Mohamad 1J
Sun Apr 29, 2018 10:58 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 900812

Re: Post All Chemistry Jokes Here

Q: What do you call a tooth in a glass of water?
A: One molar solution.
by Mohamad 1J
Sun Apr 29, 2018 10:57 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 900812

Re: Post All Chemistry Jokes Here

Q: Anyone know any jokes about sodium?
A: Na
by Mohamad 1J
Sun Apr 29, 2018 10:56 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 900812

Re: Post All Chemistry Jokes Here

Did you know that you can cool yourself to -273.15˚C and still be 0k?
by Mohamad 1J
Sun Apr 22, 2018 10:25 pm
Forum: Einstein Equation
Topic: Different equations
Replies: 4
Views: 195

Re: Different equations

Yea I have been having this problem as well. I find the best way is to try and quickly realize what you have, and what you are looking for. Always remember there the things we always know the constants and like the mass of an electron. So we always know some things, and then based on what is given t...
by Mohamad 1J
Sun Apr 22, 2018 10:17 pm
Forum: Properties of Electrons
Topic: History of experiments on the model of atom
Replies: 7
Views: 309

Re: History of experiments on the model of atom

I don't think so, I am pretty sure we just stick to the material covered in class and the problems given in the homework. The history and experiments behind the material are in the book just if we wanted to know how each thing was figured out.
by Mohamad 1J
Sun Apr 22, 2018 10:13 pm
Forum: DeBroglie Equation
Topic: Difference between DeBrogile and Light
Replies: 3
Views: 155

Re: Difference between DeBrogile and Light

You can decide which equation to use depending on what you are working with. If it is something with mass then you can use the DeBrogile equation, but as particles of light have no mass you cannot use that equation. So for light you would you the c=(wavelength)(frequency). Hope this helps!
by Mohamad 1J
Sun Apr 15, 2018 10:05 pm
Forum: SI Units, Unit Conversions
Topic: Avagrado's Number [ENDORSED]
Replies: 6
Views: 312

Re: Avagrado's Number [ENDORSED]

Avagadros number can be used to represent the number of molecules, atoms, and formula units. It is just the number we use to find out how much of one of those three is in what we are looking at.
by Mohamad 1J
Sun Apr 15, 2018 10:02 pm
Forum: SI Units, Unit Conversions
Topic: Do we have to convert final answer to make it simpler? [ENDORSED]
Replies: 4
Views: 204

Re: Do we have to convert final answer to make it simpler? [ENDORSED]

I think we just keep it in meters if anything put it in scientific notation.
by Mohamad 1J
Sun Apr 15, 2018 9:54 pm
Forum: Molarity, Solutions, Dilutions
Topic: Mass percentage
Replies: 8
Views: 348

Re: Mass percentage

I am pretty sure if it is a combustion problem you just assume whatever % is left is the oxygen, but for any other problem I believe it should add up to 100.
by Mohamad 1J
Sun Apr 15, 2018 9:49 pm
Forum: SI Units, Unit Conversions
Topic: Avogadro's Number [ENDORSED]
Replies: 11
Views: 406

Re: Avogadro's Number [ENDORSED]

Hi Kate,
Avagadros number is used to find the amount of blank in blank. It can be applied to the number of atoms in an element, the number of molecules in a compound, and even the amount of formula units in an ionic compound.
by Mohamad 1J
Sun Apr 15, 2018 9:45 pm
Forum: SI Units, Unit Conversions
Topic: Length Units
Replies: 15
Views: 494

Re: Length Units

Hey Perla,
Yes, the safest bet would be to always put the answer in proper SI units. Unless specifically said otherwise in the question.
by Mohamad 1J
Sun Apr 15, 2018 9:42 pm
Forum: SI Units, Unit Conversions
Topic: chemical formula [ENDORSED]
Replies: 4
Views: 206

Re: chemical formula [ENDORSED]

Hello!
So the placement matters when you start to have more than one element in the compound, so for H20 for example. This means there are 2 hydrogen atoms and one oxygen where if it was 2HO then it would be 2 hydrogen and 2 oxygen atoms. Hope that helps!

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