## 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: 396

### 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: 332

### 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%
Fri Dec 01, 2017 5:13 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Kw= [H30+]*[OH-]
Replies: 4
Views: 325

### 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: 1241

### 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: 2976

### 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: 601

### 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: 1184

### 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: 914

### 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: 224

### 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: 656

### 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: 384

### 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: 1565

### 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: 330

### 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: 247

### 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: 374

### 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: 345

### 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: 316

### 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: 374

### 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%
Fri Oct 06, 2017 10:16 am
Forum: Limiting Reactant Calculations
Topic: Limiting Reacant Problems made easy
Replies: 2
Views: 331