Search found 24 matches

by Tauhid Islam- 1H
Thu Jan 23, 2020 11:42 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pKa vs pH
Replies: 4
Views: 16

Re: pKa vs pH

pH=-log(concentration of H3O ions) while pKa=-log(acidity constant which is the ratio between the concentrations of hydronium ions times concentration of the acid's conjugate base divided by concentration of the acid)
by Tauhid Islam- 1H
Thu Jan 23, 2020 11:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating Kp
Replies: 6
Views: 20

Re: Calculating Kp

Partial pressures of a gas are also considered concentrations of the gas. ICE tables can be used for both molar concentrations and partial pressure.
by Tauhid Islam- 1H
Thu Jan 23, 2020 11:32 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: removing H2 from N2 + 3H2 -> 2NH3
Replies: 7
Views: 21

Re: removing H2 from N2 + 3H2 -> 2NH3

Decreasing H2 in the reaction means overall there are less reactants compared to products and the ratios between products and reactants are not at the equilibrium constant Kc, so inorder to get to the equilibrium ratio, you have to produce more reactants so the reaction shift towards the left, makin...
by Tauhid Islam- 1H
Thu Jan 23, 2020 11:19 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Molar concentration of H3O
Replies: 6
Views: 12

Re: Molar concentration of H3O

If you are just given Kw, then wouldn't the molar concentration of H3O be 1.0*10^-7?
by Tauhid Islam- 1H
Thu Jan 23, 2020 11:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ignoring solids & liquids for K
Replies: 2
Views: 10

Re: ignoring solids & liquids for K

I think it's because they are dissociated ions in the solution, and not solids or liquids. They are in an aqueous state meaning that the solid dissolved in the solvent (water i believe) and now exists as ions in the solvent.
by Tauhid Islam- 1H
Thu Jan 23, 2020 11:14 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ice Tables
Replies: 3
Views: 18

Re: Ice Tables

Your E row represents the expressions of change the species goes through inorder to reach their equilibrium points. After you calculate x or the change, you plug that into the E row and there you the concentrations of the species at equilibrium.
by Tauhid Islam- 1H
Thu Jan 23, 2020 11:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q<K
Replies: 11
Views: 37

Re: Q<K

When Q is less than K, we know that in the system, there are more reactants compared to products, so for the system to reach the ratios of products to reactants that is detonated by K, the forward reaction is favored where you would end up making more products to get the ratio to be K.
by Tauhid Islam- 1H
Thu Nov 21, 2019 2:06 am
Forum: Dipole Moments
Topic: Melting points
Replies: 15
Views: 103

Re: Melting points

Melting point and boiling points are determined by how strongly one molecule of a substance is attracted to another molecule of the same substance or another substance, essentially these forces are called intermolecular forces. These stronger these forces, the more energy required to break them and ...
by Tauhid Islam- 1H
Thu Nov 21, 2019 2:01 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Covalent Bonds
Replies: 4
Views: 28

Re: Coordination Covalent Bonds

Wait so the bond between the ligand and the TM doesn't form because of the charges from the TM and the ligand? I thought the bond forms because of the net charges, but I don't really know.
by Tauhid Islam- 1H
Thu Nov 21, 2019 1:45 am
Forum: Hybridization
Topic: hybridization
Replies: 11
Views: 57

Re: hybridization

Look at the lewis structure to help figure out the hybridization of an atom. If a central atom has four areas of electron density around it, then you need a hybridization that corresponds to those four areas. In this case, sp 3 . If an atom has three areas of electron density, the hybridization is ...
by Tauhid Islam- 1H
Thu Nov 21, 2019 1:27 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle of bent
Replies: 17
Views: 84

Re: Bond Angle of bent

The way I always remember it is by determining the electron geometries by observing the molecule by its areas of election density. This means that if a molecule has two bonds and two lone pairs, the electron geometry is tetrahedral because it has four areas of electron concentration. If the molecule...
by Tauhid Islam- 1H
Thu Nov 21, 2019 1:17 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Best Approach to Find IMFs
Replies: 11
Views: 76

Re: Best Approach to Find IMFs

The part that confused me what the induced-dipole induced dipole IMFs. From what I remember from discussion section, the larger the non-polar molecule, the easier it is to disperse the charges within the molecule, making the IMFs stronger, compared to if you had shorter non-polar molecules interacti...
by Tauhid Islam- 1H
Thu Nov 21, 2019 1:01 am
Forum: Hybridization
Topic: for test 2
Replies: 7
Views: 54

Re: for test 2

I'm pretty sure he said that it won't be on test 2 during lecture.
by Tauhid Islam- 1H
Sat Oct 12, 2019 7:13 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 73
Views: 1636

Re: Rydberg equation [ENDORSED]

What does the Energy value that we calculate in the Rydberg's Equation represent? The energy of the emitted EMR? or the energy (gained or lost) of the electron as it is moving between discreet energy levels? Or is it the same?
by Tauhid Islam- 1H
Sat Oct 12, 2019 7:07 pm
Forum: Properties of Electrons
Topic: Balmer and Lyman Series
Replies: 3
Views: 39

Re: Balmer and Lyman Series

Yes, I think the question is trying to convey the concept that when an electron is moving between energy levels, mainly falling from a higher energy level to n=1(Lyman series) and from a higher energy level to a n=2(Balmer series), EMR is emitted in different forms, from visible light to ultraviolet...
by Tauhid Islam- 1H
Sat Oct 12, 2019 6:58 pm
Forum: DeBroglie Equation
Topic: Circular standing waves
Replies: 4
Views: 25

Re: Circular standing waves

From my understanding, the radius of electron corresponds to its energy level. The farther away the electron is from the nucleus, the greater the radius, meaning the greater the quantized energy level, which corresponds to a specific frequency or wavelength the electron has. The concept is that thes...
by Tauhid Islam- 1H
Sat Oct 12, 2019 6:43 pm
Forum: Properties of Light
Topic: Absorption Spectra
Replies: 1
Views: 35

Absorption Spectra

Hello! I'm having trouble understanding what exactly an Absorption Spectra is. I know that its related to spectroscopic experiments which analyzes the relationship between electromagnetic radiation and matter like how light refracts when passing through a prism, but the connections between these exp...
by Tauhid Islam- 1H
Sat Oct 12, 2019 6:21 pm
Forum: Properties of Electrons
Topic: Derivation of De Broglie Equation
Replies: 4
Views: 34

Re: Derivation of De Broglie Equation

if i remember correctly, i think Dr. Lavelle said that you can use the De Broglie equation to solve for the frequency of an electron as the equation relates the frequency of an object to its mass and its velocity. This equation would work for any object I believe as all matter has both wave-like and...
by Tauhid Islam- 1H
Sun Oct 06, 2019 6:31 pm
Forum: Student Social/Study Group
Topic: Turning in Extra HW problems
Replies: 10
Views: 112

Re: Turning in Extra HW problems

I think it's easier to manage for the TAs if we just submit the five required HW problems. But doing the assigned problems would help your comprehension of the material. I doubt there is any extra credit associated with turning in extra problems, but you can always ask the TAs. It might just be more...
by Tauhid Islam- 1H
Sun Oct 06, 2019 6:25 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 73
Views: 1636

Re: Rydberg equation [ENDORSED]

The Rydberg equation is used in to find the wavelength of light emitted when an electron moves between energy levels. This one of the concepts covered under the quantum mechanics of the atom. is the equation just for when an electron is moving from a higher energy level to a lower energy level, thu...
by Tauhid Islam- 1H
Sun Oct 06, 2019 6:17 pm
Forum: Molarity, Solutions, Dilutions
Topic: M1V1=M2V2
Replies: 11
Views: 134

Re: M1V1=M2V2

M1V1=M2V2 is a concept that means the amount of moles in the solution remains constant whether you are changing the concentration of the solution or the volume of the solution. So by adding water to a solution with a certain morality of a certain molecule or ion, you are increasing the volume of the...
by Tauhid Islam- 1H
Sun Oct 06, 2019 6:09 pm
Forum: Molarity, Solutions, Dilutions
Topic: Volumetric Analysis
Replies: 2
Views: 36

Re: Volumetric Analysis

I think the 100. mL of the diluted solution is referring to 1.00 L of 0.50 m HNO 3 (aq) from part a. So if you have 1L of 0.50M of HNO3, and you are taking 100mL or .1L of that solution and you are trying to figure out how many mL of NaOH you need to neutralize the solution. If you just have HNO3 in...
by Tauhid Islam- 1H
Sun Oct 06, 2019 5:48 pm
Forum: Molarity, Solutions, Dilutions
Topic: Help on G21
Replies: 1
Views: 27

Re: Help on G21

So the question is asking for the molarity of each ion in the solution. Knowing that molarity is the amount of moles of ion per liter of the entire solution, you know you have to convert all three KCl, K2S and K3PO4 from grams to moles of K+. Use their respective atomic masses to figure out how many...
by Tauhid Islam- 1H
Sun Oct 06, 2019 5:31 pm
Forum: Limiting Reactant Calculations
Topic: How to determine limiting reactants
Replies: 3
Views: 51

Re: How to determine limiting reactants

From my understanding in a chemical reaction, there are reactants that are interacting with one another to produce the products. Some of the reactants are used up faster in the chemical reaction compared to the other reactants. Thus, the reactant that runs out the fastest limits how long the reactio...

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