Search found 20 matches
- Sat Dec 09, 2017 6:38 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Inert gases
- Replies: 4
- Views: 622
Re: Inert gases
If the volume is limited by a steel container then yes it has no effect on equilibrium, but if the gas is in open space then adding inert gas adds to pressure.
- Sat Dec 09, 2017 6:37 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Assuming X is small
- Replies: 2
- Views: 514
Re: Assuming X is small
I am not sure about how small the initial concentration x should be. But Ka or Kb should be less than 10 ^-3.
there is also the 5% rule where x/initial concentration * 100 should be less than 5%
there is also the 5% rule where x/initial concentration * 100 should be less than 5%
- Fri Dec 01, 2017 5:13 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Kw= [H30+]*[OH-]
- Replies: 4
- Views: 617
Re: Kw= [H30+]*[OH-]
Acids and bases ionize in water. So both are aqueous. The reaction takes place in water, so it is not a limited concentration.
- Fri Dec 01, 2017 5:10 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Solids when using ICE [ENDORSED]
- Replies: 8
- Views: 3392
Re: Solids when using ICE [ENDORSED]
Liquids are not compressed by pressure, so it does not change the speed of the reaction. That is why it is not in the equilibrium constant equation.
- Wed Nov 22, 2017 4:12 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Determine the Charge on Ligands
- Replies: 4
- Views: 8020
Re: Determine the Charge on Ligands
We can also see how much the charge is by determining the charges of all the atoms that are not part of the ligand. So if for Co(NH3)5Cl is the ligand and it is bonded to Cl then we know Cl is Cl- with negative 1 charge and this makes the ligand positive 1 charge.
- Wed Nov 22, 2017 4:06 pm
- Forum: Hybridization
- Topic: Pi Bonds vs. Sigma Bonds
- Replies: 7
- Views: 1100
Re: Pi Bonds vs. Sigma Bonds
Overall all single bonds are sigma bonds and in double or triple bonds. All bonds except the first one are pi bonds. So a double bond has 1 pi bond and a triple bond has 2 pi bonds. Both double and triple bonds have 1 sigma bond.
- Sun Nov 19, 2017 1:51 am
- Forum: Air Pollution & Acid Rain
- Topic: Acid Rain Damage [ENDORSED]
- Replies: 5
- Views: 1747
Re: Acid Rain Damage [ENDORSED]
In the soil acid rain can make the acidity much more acidic and less basic. This can kill plant life that needs a certain pH in order to survive. This water run off enters lakes where fish die from inability to filter the acidity of the water resulting in more death. Overall it makes the environment...
- Sun Nov 19, 2017 1:48 am
- Forum: Naming
- Topic: Roman Numerals
- Replies: 3
- Views: 2105
Re: Roman Numerals
Roman numerals are only correlated with the charge on the cation. The positive charge changes for certain transition metal cations and this is why different elements have different roman numerals. However this is only used for transition metals, which form positive ions or cations. Negative ions wit...
- Sat Nov 11, 2017 5:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: See-saw [ENDORSED]
- Replies: 2
- Views: 413
Re: See-saw [ENDORSED]
This is the same case with other polar bonds such as the bent structure. This is due to the same reason as chem_mod said where it is due to the lone pair that creates electron - electron repulsion and pushes the bonds away.
- Sat Nov 11, 2017 5:49 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Quick Determination of FC [ENDORSED]
- Replies: 6
- Views: 1112
Re: Quick Determination of FC [ENDORSED]
I think to really understand formal charge people need to know that it assumes covalent bonds are shared equally when in that's not true when atoms are electronegative. This means that at time even though due to formal charge the atom may have a full shell, but in actuality the other bonded atom pul...
- Sun Nov 05, 2017 10:49 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: Sulfur Dioxide?
- Replies: 3
- Views: 644
Re: Sulfur Dioxide?
This is because there are two resonance structures that are possible, but they are not as common and this can be shown through formal charge. They contribute to the resonance structure in small amounts. The third structure with the least formal charge is the best blend of all three and contributes t...
- Thu Oct 26, 2017 9:09 pm
- Forum: Hybridization
- Topic: Exceptions to Electron Orbitals
- Replies: 3
- Views: 4245
Exceptions to Electron Orbitals
I wanted to know all the exceptions that we will be required to know for the test. I mean the exceptions to the orbital rule. Electrons fill orbitals in ascending order, but sometimes electrons will fill up a later orbital and leave an earlier orbital empty. These are exceptions and I wanted to know...
- Thu Oct 26, 2017 9:02 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Orbital Shape
- Replies: 3
- Views: 514
Re: Orbital Shape
No we do not need to know the shapes because we won't be expected to draw them.
- Sat Oct 21, 2017 7:42 pm
- Forum: *Shrodinger Equation
- Topic: Shrodinger Equation [ENDORSED]
- Replies: 1
- Views: 396
Re: Shrodinger Equation [ENDORSED]
It is used as a probability distribution. This means that we can use it as a chance to see what the chances are for a certain velocity, mass, ect. The wavelength gives the chance to find a particle at a position.
- Sat Oct 21, 2017 7:40 pm
- Forum: Properties of Light
- Topic: Mathematical Error with 1.55 (a) [ENDORSED]
- Replies: 2
- Views: 584
Re: Mathematical Error with 1.55 (a) [ENDORSED]
You also need to convert meters to centimeters BY MULTIPLYING not DIVIDING.
- Fri Oct 13, 2017 8:33 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Atomic Spectroscopy vs Photoelectric Effect
- Replies: 3
- Views: 591
Re: Atomic Spectroscopy vs Photoelectric Effect
The photoelectric effect is not when n goes to infinity because the energy of the photon subtract work function = kinetic energy. Kinetic energy can vary and does not mean that the electron has separated from the atom. The electron could have traveled between certain orbitals and not out of the atom.
- Fri Oct 13, 2017 8:29 pm
- Forum: Properties of Electrons
- Topic: Wave Properties of Electrons
- Replies: 3
- Views: 489
Re: Wave Properties of Electrons
To add the other answer - Diffraction is when the waves go in multiple direction with multiple dimensions. This is due to the crystal splitting the light into its various wavelengths Destructive is when the waves come from the same source and from 2 different planes. The waves have the same intensity.
- Fri Oct 06, 2017 10:27 am
- Forum: Limiting Reactant Calculations
- Topic: M18 hELP!
- Replies: 3
- Views: 1373
Re: M18 hELP!
I think both of the replies above have the wrong mass of X2A
x = 108
A=166
so 108* 2 = 216
216+ 166 = 382
unless I am wrong I think that is the proper molar mass that must be pultiplied by .004 mol of X2A
resulting in 1.53 g of X2A
.985/1.53 * 100 = 64.4%
x = 108
A=166
so 108* 2 = 216
216+ 166 = 382
unless I am wrong I think that is the proper molar mass that must be pultiplied by .004 mol of X2A
resulting in 1.53 g of X2A
.985/1.53 * 100 = 64.4%
- Fri Oct 06, 2017 10:16 am
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reacant Problems made easy
- Replies: 2
- Views: 621
- Fri Oct 06, 2017 10:14 am
- Forum: Limiting Reactant Calculations
- Topic: Theoretical Yield [ENDORSED]
- Replies: 6
- Views: 768
Re: Theoretical Yield [ENDORSED]
If we have 30. g of Na and unlimited Cl2 what is the percent yield of NaCL if 22. g were created when the reaction went to completion? We can convert 30. g Na to moles because it is limiting and Cl2 is excess. 30g na / 23 g na = 1.3 mol Na. Now we can do the molar ratio of Na to NaCl. 1 mol NaCl/ 1 ...