Search found 15 matches
- Fri May 04, 2018 4:26 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2.37
- Replies: 2
- Views: 353
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 ...
- Fri May 04, 2018 4:05 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Cr and Cu exceptions
- Replies: 3
- Views: 529
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...
- Fri May 04, 2018 3:52 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Chromium and Copper Electron Configurations
- Replies: 2
- Views: 2153
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,...
- Sun Apr 29, 2018 10:58 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3638611
Re: Post All Chemistry Jokes Here
Q: What do you call a tooth in a glass of water?
A: One molar solution.
A: One molar solution.
- Sun Apr 29, 2018 10:57 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3638611
Re: Post All Chemistry Jokes Here
Q: Anyone know any jokes about sodium?
A: Na
A: Na
- Sun Apr 29, 2018 10:56 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3638611
Re: Post All Chemistry Jokes Here
Did you know that you can cool yourself to -273.15˚C and still be 0k?
- Sun Apr 22, 2018 10:25 pm
- Forum: Einstein Equation
- Topic: Different equations
- Replies: 4
- Views: 539
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...
- Sun Apr 22, 2018 10:17 pm
- Forum: Properties of Electrons
- Topic: History of experiments on the model of atom
- Replies: 7
- Views: 846
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.
- Sun Apr 22, 2018 10:13 pm
- Forum: DeBroglie Equation
- Topic: Difference between DeBrogile and Light
- Replies: 3
- Views: 513
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!
- Sun Apr 15, 2018 10:05 pm
- Forum: SI Units, Unit Conversions
- Topic: Avagrado's Number [ENDORSED]
- Replies: 6
- Views: 1139
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.
- 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: 510
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.
- Sun Apr 15, 2018 9:54 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Mass percentage
- Replies: 8
- Views: 1035
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.
- Sun Apr 15, 2018 9:49 pm
- Forum: SI Units, Unit Conversions
- Topic: Avogadro's Number [ENDORSED]
- Replies: 11
- Views: 1412
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.
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.
- Sun Apr 15, 2018 9:45 pm
- Forum: SI Units, Unit Conversions
- Topic: Length Units
- Replies: 15
- Views: 1522
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.
Yes, the safest bet would be to always put the answer in proper SI units. Unless specifically said otherwise in the question.
- Sun Apr 15, 2018 9:42 pm
- Forum: SI Units, Unit Conversions
- Topic: chemical formula [ENDORSED]
- Replies: 4
- Views: 955
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!
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!