Search found 32 matches

by Ashish Verma 2I
Sun Jan 13, 2019 6:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Different Concentrations [ENDORSED]
Replies: 1
Views: 25

Re: Different Concentrations [ENDORSED]

You can convert between partial pressure and molar concentrations using the Ideal Gas Law:



by Ashish Verma 2I
Sun Jan 13, 2019 6:17 pm
Forum: Ideal Gases
Topic: Definition of an Ideal Gas [ENDORSED]
Replies: 2
Views: 19

Re: Definition of an Ideal Gas [ENDORSED]

An ideal gas is one which perfectly obeys the Ideal Gas Law: PV = nRT.
All collisions between molecules are elastic, kinetic energy and momentum are conserved, and the law is obeyed exactly, without any discrepancies.
by Ashish Verma 2I
Sun Jan 13, 2019 6:15 pm
Forum: Ideal Gases
Topic: Pressure and Temperature [ENDORSED]
Replies: 2
Views: 43

Re: Pressure and Temperature [ENDORSED]

Temperature is directly proportional to the average kinetic energy of molecules of a gas. By increasing the pressure these molecules are placed in a more compact setting, causing them to bounce off each other more frequently, and thus move faster. As these molecules move faster, the temperature incr...
by Ashish Verma 2I
Sun Dec 09, 2018 1:46 pm
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 9
Views: 101

Re: Trend of Electronegativity

Electronegativity increases as you go up the periodic table as the energy level is lower so electrons are held closer to the nucleus with lower atomic radii and an increased effective nuclear charge. As you go across the periodic table electronegativity also increases as the energy level remains the...
by Ashish Verma 2I
Sun Dec 09, 2018 10:59 am
Forum: Biological Examples
Topic: Cisplatin
Replies: 2
Views: 33

Re: Cisplatin

In cisplatin the molecule is organized so that both binding sites are on the same side of the molecule so it can bind twice to the same strand of DNA stopping cell division.
by Ashish Verma 2I
Sun Dec 09, 2018 10:20 am
Forum: Calculating the pH of Salt Solutions
Topic: konstant?
Replies: 1
Views: 24

Re: konstant?

Do you mean the equilibrium constant? That represents the ratio of products over reactants in a reaction at equilibrium.
by Ashish Verma 2I
Sun Dec 09, 2018 10:18 am
Forum: Identifying Acidic & Basic Salts
Topic: Which salts produce which solutions
Replies: 1
Views: 32

Re: Which salts produce which solutions

Salts that contain the conjugate base of a weak acid will raise pH by removing protons from water to generate hydroxide. Sodium acetate is a good example of this.
by Ashish Verma 2I
Sun Dec 09, 2018 1:05 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E 7 7th edition
Replies: 1
Views: 25

Re: 2E 7 7th edition

The answer book is correct. The formula should be AX3E as there are three atoms bonded to the central atom, one oxygen atom and two chlorine atoms.
by Ashish Verma 2I
Sun Dec 09, 2018 12:49 am
Forum: Significant Figures
Topic: Quantum World, Test 2: SigFigs
Replies: 1
Views: 34

Re: Quantum World, Test 2: SigFigs

1 sig fig
by Ashish Verma 2I
Sun Dec 09, 2018 12:47 am
Forum: Bronsted Acids & Bases
Topic: Bronsted acid
Replies: 4
Views: 42

Re: Bronsted acid

Because it donates a proton to become a stable anion (Br-)
by Ashish Verma 2I
Sun Dec 09, 2018 12:46 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Strong/weak acids and bases
Replies: 2
Views: 42

Re: Strong/weak acids and bases

I think he just wanted us to memorize them but generally speaking many strong acids are either polyprotic or the conjugate acid of a halogen anion (with HF being a notable exception).
by Ashish Verma 2I
Sun Dec 09, 2018 12:45 am
Forum: Ionic & Covalent Bonds
Topic: Ionic vs.covalent bonding
Replies: 2
Views: 35

Re: Ionic vs.covalent bonding

Ionic bonding usually involves a metal cation and a non metal anion and a transference of charge.
Covalent bonding usually involves two nonmetal atoms and a sharing of electrons in a bond, (no charge only potential dipoles)
by Ashish Verma 2I
Sun Dec 09, 2018 12:43 am
Forum: Air Pollution & Acid Rain
Topic: Final
Replies: 2
Views: 41

Re: Final

Pages 490-491 in the 7th Edition have a small blurb on this.
by Ashish Verma 2I
Sun Dec 09, 2018 12:42 am
Forum: Air Pollution & Acid Rain
Topic: Final
Replies: 2
Views: 41

Re: Final

I don't think you need to know anything specifically about acid rain just the concepts involved in that example from the book regarding the reaction of carbonic acid (or a similar strong acid) and water.
by Ashish Verma 2I
Sun Dec 09, 2018 12:16 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Practice problem
Replies: 2
Views: 30

Re: Practice problem

The question focuses on using this quantum equation for hydrogen: E_{n}=\frac{hR_{h}}{n^2} Manipulating the equation with the information given, (the energy released as the electron went from one energy level to another) you get: E=\frac{hR_{h}}{n_{f}^2}-\frac{hR_{h}}{n_{i}^2} Where: E = The energy ...
by Ashish Verma 2I
Sat Dec 08, 2018 11:54 pm
Forum: Hybridization
Topic: Hybrid Orbitals
Replies: 1
Views: 12

Re: Hybrid Orbitals

It seems to be asking for they hybridization of the second carbon in the chain. That carbon is attached to two other carbons, the first in the chain with a single bond and the third with a triple bond. As such it has two regions of electron density and thus exhibits a hybridization of sp.
by Ashish Verma 2I
Sat Dec 08, 2018 11:51 pm
Forum: Amphoteric Compounds
Topic: Amphoteric vs. Amphiprotic
Replies: 1
Views: 29

Re: Amphoteric vs. Amphiprotic

An amphoteric substance can act as either an acid or a base. An amphiprotic substance is a more specific type of amphoteric substance that can easily accept or donate hydrogen ions.
by Ashish Verma 2I
Sat Dec 08, 2018 11:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pair locations
Replies: 1
Views: 22

Re: Lone pair locations

I would assume their orientation as in bond angles and shape and VSEPR formulas. How they would experience repulsion and orient themselves far apart from each other such as in a square planar shape.
by Ashish Verma 2I
Sat Dec 08, 2018 11:41 pm
Forum: Air Pollution & Acid Rain
Topic: practice problems?
Replies: 1
Views: 27

Re: practice problems?

There is an informational blurb with some example equations in section 6.E.4 on pages 490-491 of the seventh edition.
by Ashish Verma 2I
Sat Dec 08, 2018 11:38 pm
Forum: Conjugate Acids & Bases
Topic: Can someone check if I'm right
Replies: 2
Views: 43

Re: Can someone check if I'm right

Keep in mind the hydronium ion has a 1+ charge as H30+ but yes that is correct. Also note that both HSO4- and H20 are amphoteric. But yes you are correct. :)
by Ashish Verma 2I
Sat Dec 08, 2018 11:24 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability vs. Polarizing Power
Replies: 2
Views: 48

Polarizability vs. Polarizing Power

What is the difference between polarizability and polarizing power?
by Ashish Verma 2I
Sat Dec 08, 2018 11:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw and t shape angles
Replies: 2
Views: 25

Re: Seesaw and t shape angles

Less than 120, also in the case of T-Shape versus seesaw both sets of bonds you've referred to are less than 90 degrees but indicating which is specifically lower is not usually important as long as you state that they are each lower than 90.
by Ashish Verma 2I
Sat Dec 08, 2018 10:47 pm
Forum: Calculating the pH of Salt Solutions
Topic: Salt Solution pH — 7th Edition 6.D.11
Replies: 2
Views: 28

Re: Salt Solution pH — 7th Edition 6.D.11

You're right it would dissociate into the K+ and F- ions; however, F- is the conjugate base of hydofluoric acid, HF, which is a WEAK acid not a strong acid, and therefore does still affect pH.
by Ashish Verma 2I
Sat Dec 08, 2018 10:38 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Pi bonds
Replies: 1
Views: 25

Re: Pi bonds

I'm not sure but I believe that this is outside the scope of our course as it is from section 2.G.1 in the textbook and the entire 2.G section is absent from the syllabus.
by Ashish Verma 2I
Sat Dec 08, 2018 10:16 pm
Forum: Lewis Acids & Bases
Topic: Lewis Acid
Replies: 6
Views: 48

Re: Lewis Acid

Bromine is in Group 4 of the Periodic Table while Fluorine is in Group 2. Based on periodic trends and atomic mass, Bromine is a heavier atom with a much larger atomic radius. As such, the single bond in HBr is much longer than the single bond in HF. Longer bonds are weaker so hydrobromic acid has a...
by Ashish Verma 2I
Mon Oct 15, 2018 9:06 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module
Replies: 3
Views: 62

Photoelectric Effect Module

I had a question about one of the parts of the Photoelectric Effect Module Post Assessment. Question 30 specifically. The given information is as follows: Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 10^5 m/s. The work function for sodium is 150.6 kJ/mol. The ...
by Ashish Verma 2I
Mon Oct 15, 2018 8:28 pm
Forum: *Particle in a Box
Topic: Hw assignment?
Replies: 7
Views: 170

Re: Hw assignment?

I believe we are still on the quantum section for homework since we haven't covered anything further so we aren't prepared for homework on sections that have never been discussed in lecture. Also my TA allowed us to do homework from the high school chem review section for both Week 1 and Week 2 sinc...
by Ashish Verma 2I
Mon Oct 15, 2018 8:25 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: What the equation is used for
Replies: 5
Views: 61

Re: What the equation is used for

I'm confused as well and am not entirely sure but I think the equation is more conceptually used to prove that at this scale the means of measurement affects the outcome like Dr. Lavelle emphasized. I think it just proves that by measuring either momentum or distance of an electron in this type of a...
by Ashish Verma 2I
Fri Oct 05, 2018 4:17 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: diatomic elements
Replies: 12
Views: 265

Re: diatomic elements

One cheap mnemonic device to remember these is: Never Have Fear Of Ice CoLd Bread
Never: Nitrogen
Have: Hydrogen
Fear: Fluorine
Of: Oxygen
Ice: Iodine
CoLd: Chlorine
Bread: Bromine
by Ashish Verma 2I
Fri Oct 05, 2018 2:32 am
Forum: Molarity, Solutions, Dilutions
Topic: (Typo??) HW L.35 - 7th edition
Replies: 3
Views: 111

Re: (Typo??) HW L.35 - 7th edition

I have the seventh edition book and solutions manual and I had the exact same issue as you. My third equation in the book is also listed as FeBr_2+Na_2CO_3->NaBr+CO_2+Fe_3O_4 But since the solutions manual uses Fe_3Br_8 I'm assuming that's a typo like you said and just using that as the first reacta...
by Ashish Verma 2I
Fri Oct 05, 2018 12:55 am
Forum: Significant Figures
Topic: Significant Figures for E.21 (b)
Replies: 4
Views: 53

Significant Figures for E.21 (b)

Question E.21 (b) asks you to calculate the moles and number of molecules in 25.92 mg of hydrogen fluoride. I tried to solve the question but ended up getting an answer with the incorrect number of significant figures and I can't explain why: \frac{25.92 mg HF}{1}*\frac{1gHF}{1000mgHF}*\frac{1molHF}...

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