## Search found 30 matches

Fri Dec 07, 2018 7:42 pm
Forum: Bond Lengths & Energies
Topic: Double bond lengths
Replies: 2
Views: 343

### Re: Double bond lengths

I thought it was based on the atomic radius and if so how?
Fri Dec 07, 2018 7:40 pm
Forum: Lewis Acids & Bases
Topic: Why is water always a lewis base?
Replies: 2
Views: 132

### Re: Why is water always a lewis base?

An acid is considered to be electron deficient meaning it accepts electrons. Unlike water, it would not accept electrons rather it would be a hydrogen- donor, donating an H+ to a base. But it can also accept an H+ depending with what it is reacting.
Fri Dec 07, 2018 7:26 pm
Forum: Bronsted Acids & Bases
Topic: Cl- and F-
Replies: 4
Views: 229

### Re: Cl- and F-

HCL when disassociated it does so completely which makes it a strong acid because it won't go back with the H+ and therefore is able to donate the proton. On the other hand, HF will disassociate but not completely and therefore will go back with H+ making a weak acid because it is harder to take awa...
Fri Dec 07, 2018 7:19 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: TM and oxidation states
Replies: 1
Views: 102

### Re: TM and oxidation states

Transition metals can have many oxidation states because of their several electrons that have similar energies which meaning they can be removed or electron can be added.
Fri Dec 07, 2018 7:15 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculate pH or pOH [ENDORSED]
Replies: 2
Views: 132

### Re: Calculate pH or pOH[ENDORSED]

To calculate pH you would take the negative log of Hydronium or H+
and to find the pOH you would take the negative log of [OH-].

pH= -log [H+]
pOH= -log [OH-]
Fri Dec 07, 2018 2:01 pm
Forum: General Science Questions
Topic: Determining states
Replies: 1
Views: 206

### Re: Determining states

I do not believe we are supposed to memorize the states or be able to determine them for 14 A.
Fri Dec 07, 2018 1:59 pm
Forum: Dipole Moments
Topic: partial charge
Replies: 2
Views: 333

### Re: partial charge

That would be because of the electronegativity of Carbon being higher.
Fri Dec 07, 2018 1:57 pm
Forum: Bronsted Acids & Bases
Topic: Lewis Acids and Bases and Bronsted?
Replies: 5
Views: 253

### Re: Lewis Acids and Bases and Bronsted?

Lewis acids are electron acceptors and Lewis bases are electron donors.
Bronstad acids are proton donors and Bronsted bases are proton acceptors.
Fri Dec 07, 2018 1:54 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate and Monodentate
Replies: 1
Views: 97

### Re: Polydentate and Monodentate

A polydentate is a ligand that can donate multiple pairs while a monodentate can only donate one pair.
For example, water is monodentate that can only give up an H
and EDTA is polydentate that can donate multiple pairs.
Thu Dec 06, 2018 3:35 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Kw
Replies: 2
Views: 139

### Re: Kw

The pKw will always be 14 because there can't be a pH higher than 14.
Wed Dec 05, 2018 4:43 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: electron transitions
Replies: 2
Views: 424

### Re: electron transitions

It would be decreasing energy level making it a negative value and when that occurs energy is released.
Wed Dec 05, 2018 4:27 pm
Forum: Hybridization
Topic: Identifying Hybridization
Replies: 2
Views: 167

### Re: Identifying Hybridization

That will always represent H2O (water) which has a bent shape so it shall always be assumed there are two lone pairs.
Fri Nov 23, 2018 10:51 am
Forum: Hybridization
Topic: Imagining Hybridization
Replies: 2
Views: 136

### Re: Imagining Hybridization

Ex: Methane CH4
has an electron configuration of carbon is 1s 2s2 2p2 --> 2s2 2px1 2py1
the excited electron configuration becomes 2s1 2px1 2py1 2pz1 this is true because it forms 4 equal hybridized orbitals

Which is why it is called 2sp3
Fri Nov 23, 2018 10:35 am
Forum: Dipole Moments
Topic: Bond Angles
Replies: 8
Views: 382

### Re: Bond Angles

For planar geometries, you can just divide 360 by the number of angles, for example, a trigonal planar 360/3 and for 3-d geometries, it is best to memorize which should not be that hard.
Fri Nov 23, 2018 10:30 am
Forum: Ionic & Covalent Bonds
Topic: Ionic & covalent character
Replies: 6
Views: 498

### Re: Ionic & covalent character

Although both characteristics can be seen in a compound one will be most dominant, which will most likely determine the name of the character in the compound. (At least that is how I see it)
Thu Nov 15, 2018 10:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion Strength
Replies: 5
Views: 205

### Re: Repulsion Strength

It also helps in determining the shape of a molecule. Whether it is bent and therefore also the angles.
Thu Nov 15, 2018 10:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 3
Views: 149

### Re: Lone Pairs

It mostly depends on the repulsion;

Lone-lone pair > lone - bonding pair > bonding-bonding pair replusion.
Thu Nov 15, 2018 10:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Formula for determining bond angle
Replies: 6
Views: 310

### Re: Formula for determining bond angle

It mostly depends on how many electron density areas there are in a shape and in order to give the angle, I would memorize them.
Sat Nov 10, 2018 6:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing Lewis Structures with VSPER
Replies: 5
Views: 246

### Re: Drawing Lewis Structures with VSPER

If I am not mistaken I remember Dr. Lavelle saying that the correct way to draw the Lewis structure would be with the 120-degree spacing, but it is fine to draw it without the spacing.
Sat Nov 10, 2018 6:40 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: E- configuration
Replies: 3
Views: 233

### Re: E- configuration

If the d- orbital is is full and you have to take away electrons then the d -orbital would be written first followed by the s - orbital because it is more favorable to take away electrons from it. It also depends on what the coefficient is . Ex: Zn: [Ar] 4s^2 3d^10 ---> would be [Ar] 3d^10 4s^2
Sat Nov 10, 2018 6:33 pm
Forum: Ionic & Covalent Bonds
Topic: Relation between strong acid and weak bond
Replies: 3
Views: 206

### Re: Relation between strong acid and weak bond

A weak bond would be a strong acid because an acid is an electron acceptor meaning that it has fewer electrons and therefore the bond is weaker.
Fri Nov 02, 2018 8:12 am
Forum: Electronegativity
Topic: Electron Configuration
Replies: 2
Views: 115

### Re: Electron Configuration

The f- block are the elements that are outside the periodic table, but they go between La (57) and Ha (72). You can just look at the periodic table.
Fri Nov 02, 2018 8:08 am
Forum: Properties of Electrons
Topic: De Broglie Formula vs. Speed of Light Formula
Replies: 5
Views: 421

### Re: De Broglie Formula vs. Speed of Light Formula

De Broglie is only used when the question explicitly says use the de Broglie equation to find whatever it is they are asking.
Thu Nov 01, 2018 6:49 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ground State to Ion with D subshell
Replies: 2
Views: 141

### Re: Ground State to Ion with D subshell

The electrons are removed first from the S orbital because they are the ones with less influence on the nucleus.
Thu Oct 25, 2018 8:53 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 14
Views: 990

### Re: Work Function

You would just rearrange the equation EK = h v - workfunction
to solve. The Ek should be given if you are looking for workfunction.
Thu Oct 25, 2018 8:49 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbital Shape for Larger Quantum Numbers
Replies: 3
Views: 147

### Re: Orbital Shape for Larger Quantum Numbers

For all nf

l = 3 always

(i.e 5f ---> n=5, l= 3)
Thu Oct 25, 2018 8:46 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: quiz 2: 5-s orbital
Replies: 3
Views: 131

### Re: quiz 2: 5-s orbital

We have to memorize/ know that
s-orbital=1 orbitals = 2 e-
p-orbital=3 orbitals= 6 e-
d-orbital=5 orbitals= 10 e-
f-orbital= 7 orbitals = 14 e-

To find e-, simply multiply by 2
Thu Oct 18, 2018 2:54 pm
Forum: Properties of Light
Topic: Test 2 [ENDORSED]
Replies: 15
Views: 567

### Re: Test 2[ENDORSED]

Quantum will be tested on Test 2. You can look in the syllabus for the exact description.
Thu Oct 18, 2018 2:53 pm
Forum: Einstein Equation
Topic: Photons and E=hv
Replies: 5
Views: 562

### Re: Photons and E=hv

E=hv is the same as Energy(photon) = to hv, in other words, it is proportionate to the frequency.
Tue Oct 16, 2018 8:02 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module
Replies: 3
Views: 1201

### Re: Photoelectric Effect Module

Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. Answer the following three questions. A. What is the kinetic energy of the ejected electron? How would one go about to solve this problem? What equation wou...