Search found 67 matches

by Shrayes Raman
Sun Jan 12, 2020 11:51 pm
Forum: Ideal Gases
Topic: Q vs. K
Replies: 10
Views: 21

Re: Q vs. K

Q is basically calculated the same way as K but can be calculated at any point in a reaction not just during equilibrium
by Shrayes Raman
Sun Jan 12, 2020 11:50 pm
Forum: Ideal Gases
Topic: partial pressures
Replies: 7
Views: 29

Re: partial pressures

The second part ratio represents K and K will be the same regardless of quantity
by Shrayes Raman
Sun Jan 12, 2020 11:49 pm
Forum: Ideal Gases
Topic: Understanding Q
Replies: 19
Views: 67

Re: Understanding Q

Q is calculated the same exact way as K just it can be anytime during reaction not just during equilibrium
by Shrayes Raman
Sun Jan 12, 2020 11:48 pm
Forum: Ideal Gases
Topic: Kc vs Kp
Replies: 5
Views: 16

Re: Kc vs Kp

Kc = Concentrions Kp = Partial Pressures. If given partial pressures use Kp and vice versa. This will tell you state of materials
by Shrayes Raman
Sun Jan 12, 2020 11:46 pm
Forum: Ideal Gases
Topic: Le Chatelier's Principle
Replies: 7
Views: 43

Re: Le Chatelier's Principle

Le Chateliers principle is basically the idea that a chemical reaction will adjust to maintain chemical equilibrium. For instance if you remove product more product is produced to maintain the equilibrium
by Shrayes Raman
Sun Jan 12, 2020 11:45 pm
Forum: Ideal Gases
Topic: The Laws
Replies: 7
Views: 26

Re: The Laws

I mean so far we have covered the ideal gas law/equation but we will probably learn more. PV=nRT
by Shrayes Raman
Sun Dec 08, 2019 12:14 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Alkaline vs. acidic solutions
Replies: 2
Views: 24

Re: Alkaline vs. acidic solutions

When the pH is lower than pKa the H+ will associate with conjugate base again... if pH is higher than pKa then H+ will disassociate.
by Shrayes Raman
Sun Dec 08, 2019 12:12 am
Forum: Amphoteric Compounds
Topic: 6A.17
Replies: 4
Views: 50

Re: 6A.17

Lavelle said that nonmetal oxides usually form acidic solutions
by Shrayes Raman
Sun Dec 08, 2019 12:09 am
Forum: Identifying Acidic & Basic Salts
Topic: Identifying Acidic and Basic Salts
Replies: 3
Views: 50

Re: Identifying Acidic and Basic Salts

There is a whole section in the Textbook dedicated to the helpful rules... You might find that helpful
by Shrayes Raman
Sun Dec 08, 2019 12:08 am
Forum: Polyprotic Acids & Bases
Topic: How can you tell if an acid/base is polyprotic?
Replies: 5
Views: 56

Re: How can you tell if an acid/base is polyprotic?

Molecules that have more than H+ tend to be polyprotic more often than not, especially when in the front of the name ie H2S04
by Shrayes Raman
Sun Dec 08, 2019 12:07 am
Forum: Identifying Acidic & Basic Salts
Topic: weak bases produce acidic solutions?
Replies: 3
Views: 28

Re: weak bases produce acidic solutions?

Weak bases and strong acids produce acidic solutions and vice versa
by Shrayes Raman
Sun Dec 08, 2019 12:04 am
Forum: Calculating the pH of Salt Solutions
Topic: 6D.11 [ENDORSED]
Replies: 2
Views: 110

Re: 6D.11 [ENDORSED]

Transition Metal cations form complexes that deprotanate some molecules leaving free H+ in the solution as H3O
by Shrayes Raman
Sun Dec 08, 2019 12:00 am
Forum: Air Pollution & Acid Rain
Topic: acid rain
Replies: 4
Views: 68

Re: acid rain

Understand the reasons behind its creation and the different molecules involved
by Shrayes Raman
Sun Dec 01, 2019 11:33 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: bronsted acid
Replies: 5
Views: 19

Re: bronsted acid

Donating a proton is a Bronsted Acid, Accepting a proton is a bronsted base.
by Shrayes Raman
Sun Dec 01, 2019 11:32 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Relative Acidity
Replies: 4
Views: 32

Re: Relative Acidity

Delocalization of electrons lessens the instability caused by having one area of lone pair electrons spreading this out helps.
by Shrayes Raman
Sun Dec 01, 2019 11:31 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: electronegativity
Replies: 4
Views: 21

Re: electronegativity

Periodic trends say that the closer to fluorine an atom is the more electro negative.
by Shrayes Raman
Sun Dec 01, 2019 11:27 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strength of Acids - Example from Lecture
Replies: 6
Views: 34

Re: Strength of Acids - Example from Lecture

Draw the Lewis structure and see that the Cl form a ring around central carbon and then the lone pairs on the Cl pull on the Oxygen delocalizing the electrons which increases stability.
by Shrayes Raman
Sun Dec 01, 2019 11:23 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: The pH Scale
Replies: 7
Views: 57

Re: The pH Scale

Know the how to calculate the pH ie -log() and pOH and know how to interpret results
by Shrayes Raman
Sun Dec 01, 2019 11:21 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid and water
Replies: 2
Views: 17

Re: Acid and water

The acid "donates" a H+ to to the surrounding H2O and forms H3O+. To get pH take negative log of the H+/H3O+ (They will be the same)
by Shrayes Raman
Wed Nov 27, 2019 2:34 am
Forum: Hybridization
Topic: Hybridization of PF5
Replies: 4
Views: 26

Re: Hybridization of PF5

Sp3 four regions of electron density
by Shrayes Raman
Wed Nov 27, 2019 2:33 am
Forum: Hybridization
Topic: 2F.15
Replies: 3
Views: 24

Re: 2F.15

Bond angle increases with more s character... Sp2 has more than Sp3 etc
by Shrayes Raman
Wed Nov 27, 2019 2:32 am
Forum: Hybridization
Topic: Bond angle/s character
Replies: 3
Views: 22

Re: Bond angle/s character

Sp3 has less s character than sp2 so so will have more than sp2... This means the bond angle will increase as a trend
by Shrayes Raman
Wed Nov 27, 2019 2:31 am
Forum: Hybridization
Topic: Composition of each bond
Replies: 2
Views: 31

Re: Composition of each bond

Be able to identify the bonds
by Shrayes Raman
Wed Nov 27, 2019 2:29 am
Forum: Hybridization
Topic: sigma or pi?
Replies: 20
Views: 102

Re: sigma or pi?

If a Lewis structure includes a double bond it will have a pi bond in the double bond
by Shrayes Raman
Wed Nov 27, 2019 2:28 am
Forum: Hybridization
Topic: Sigma and Pi Bonds
Replies: 21
Views: 70

Re: Sigma and Pi Bonds

Sigma bonds allow rotation as they have one axis of connection whereas pi bonds have two.
by Shrayes Raman
Mon Nov 18, 2019 10:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 3
Views: 26

Re: Lone Pairs

They have much stronger repulsion that lone pair bonding or bonding orbitals thus they take up more space or rather push the other bonds away
by Shrayes Raman
Mon Nov 18, 2019 10:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Formal Charge
Replies: 2
Views: 13

Re: Formal Charge

I think you should first draw most stable lewis structure and base vespr off that
by Shrayes Raman
Mon Nov 18, 2019 10:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shapes
Replies: 6
Views: 33

Re: Shapes

I think we need to know all of the ones that are listed in the notes and in the textbook in 2E
by Shrayes Raman
Mon Nov 18, 2019 10:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.5
Replies: 4
Views: 221

Re: 4.5

Since the lewis dot structure show a lone pair on the Cl there will be a repulsion from the lone pair causing a 120 degree bent shape.
by Shrayes Raman
Mon Nov 18, 2019 10:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: dipole dipole
Replies: 5
Views: 36

Re: dipole dipole

Larger molecules i.e. Iodine will have a larger dipole moment
by Shrayes Raman
Mon Nov 18, 2019 10:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Pi bond
Replies: 4
Views: 27

Re: Pi bond

Yes because the double bond does not allow rotation as it would break.
by Shrayes Raman
Mon Nov 18, 2019 10:44 pm
Forum: Hybridization
Topic: Hybridization
Replies: 4
Views: 26

Re: Hybridization

Hybridization is not a bond necessarily, rather a model for how atomic orbitals of different energies fuse to form bonding orbitals
by Shrayes Raman
Wed Nov 13, 2019 12:10 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: Hydrogen bonding
Replies: 5
Views: 31

Re: Hydrogen bonding

Hydrogen bonds occur due to the highly electro negative atoms interacting with hydrogens electrons
by Shrayes Raman
Wed Nov 13, 2019 12:09 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: melting points
Replies: 5
Views: 29

Re: melting points

NaCl has a ionic as opposed to a covalent bond which is stronger that HCl and there for melts at a higher temp
by Shrayes Raman
Sun Nov 03, 2019 10:39 pm
Forum: Lewis Structures
Topic: Delocalized Electrons
Replies: 4
Views: 21

Re: Delocalized Electrons

Delocalization refers to the fact that certain electron groups don't need to be in a particular place as they have a blend of resonance structures
by Shrayes Raman
Sun Nov 03, 2019 10:38 pm
Forum: Ionic & Covalent Bonds
Topic: Homework 2D #15
Replies: 5
Views: 46

Re: Homework 2D #15

This question is referencing the atomic trend of greater radius as atoms get bigger so they have weaker bonds as the electrons are easier to "push out"
by Shrayes Raman
Sun Nov 03, 2019 10:36 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability and Covalent Character
Replies: 5
Views: 48

Re: Polarizability and Covalent Character

Ionic bonds can have covalent character if the electrons are pulled from one atom to the other in a way creating a sharing system not unlike covalent bonds
by Shrayes Raman
Sun Nov 03, 2019 10:33 pm
Forum: Sigma & Pi Bonds
Topic: Double bond
Replies: 15
Views: 107

Re: Double bond

Calculate formal charge of all the atoms of a molecule and see if the most stable configuration includes a double bond. They can help to stabilize the structure
by Shrayes Raman
Sun Nov 03, 2019 10:30 pm
Forum: Octet Exceptions
Topic: Octet Exceptions
Replies: 7
Views: 62

Re: Octet Exceptions

P-Block elements in periods or higher have unfilled d sub-shells so they can have expanded octets
by Shrayes Raman
Sun Oct 27, 2019 11:01 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 6
Views: 46

Re: Resonance

A molecule with more resonance structures gives a better opportunity to have lower energy electrons and thus become stable.
by Shrayes Raman
Sun Oct 27, 2019 10:59 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 8
Views: 38

Re: Resonance

There are multiple possible ways in which a molecule can be pictured in Lewis dot form. This is what resonance refers to.
by Shrayes Raman
Sun Oct 27, 2019 10:58 pm
Forum: Resonance Structures
Topic: Arrangement of Atoms
Replies: 3
Views: 17

Re: Arrangement of Atoms

Molecules want to be in their most stable form. This is achieved when the individual atoms have their lowest formal charge.
by Shrayes Raman
Sun Oct 27, 2019 10:57 pm
Forum: Resonance Structures
Topic: Octet
Replies: 13
Views: 82

Re: Octet

Octet refers to the usual number of preferred valence electrons for atoms. There are exceptions like He H and Li, but for the most part atoms just want 8 valence electrons.
by Shrayes Raman
Sun Oct 27, 2019 10:55 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 14
Views: 69

Re: Covalent Bonds

Only formed between two non-metals as they are the most likely to share electrons (covalently bond) between atoms to fill valence shell.
by Shrayes Raman
Sun Oct 27, 2019 10:54 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons
Replies: 16
Views: 110

Re: Valence Electrons

For S and P block elements look at the last digit on the group number.
by Shrayes Raman
Fri Oct 18, 2019 12:09 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Radiation Type
Replies: 5
Views: 32

Re: Radiation Type

In my discussion we were told to know the rough idea of where things were, and visible light is 400-700ish.
by Shrayes Raman
Fri Oct 18, 2019 12:08 am
Forum: DeBroglie Equation
Topic: the m in the de broglie equation
Replies: 5
Views: 34

Re: the m in the de broglie equation

Not always atom. Whatever the object or particle is in the context of the problem.
by Shrayes Raman
Fri Oct 18, 2019 12:07 am
Forum: *Shrodinger Equation
Topic: Nodal Planes
Replies: 6
Views: 29

Re: Nodal Planes

f have 3 nodal planes
by Shrayes Raman
Fri Oct 18, 2019 12:06 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Momentum
Replies: 7
Views: 75

Re: Momentum

Moment or p (not actually p but looks like it!) is a product of mass and velocity. Its possible to encounter a question where this might be asked for. However, from what I have seen the velocity part is more important. That's also what leads to momentum uncertainty.
by Shrayes Raman
Fri Oct 18, 2019 12:04 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Homework Problem 1B.27
Replies: 6
Views: 66

Re: Homework Problem 1B.27

The question says plus or minus 5 which gives a maximum indeterminacy of 10. Use 10 in your calculation.
by Shrayes Raman
Fri Oct 11, 2019 8:47 am
Forum: Properties of Light
Topic: Clarification on Frequency
Replies: 8
Views: 86

Re: Clarification on Frequency

Increasing the intensity is not the same as changing the frequency. When we change frequency we are changing the energy of each photon of the incoming em radiation. When we change intensity we change the number of the photons coming in.
by Shrayes Raman
Fri Oct 11, 2019 8:44 am
Forum: Properties of Light
Topic: "Work Function" (from Post-Assessment Module)
Replies: 4
Views: 45

Re: "Work Function" (from Post-Assessment Module)

The work function refers to the energy required to eject an electron. This is subtracted from the initial energy of the incoming photon to find the energy of the photon as it leaves
by Shrayes Raman
Fri Oct 11, 2019 8:42 am
Forum: Properties of Light
Topic: Waves/Particles
Replies: 14
Views: 122

Re: Waves/Particles

Photons are the particles that are used in the particle way of thinking about light.
by Shrayes Raman
Fri Oct 11, 2019 8:42 am
Forum: Properties of Light
Topic: Waves/Particles
Replies: 14
Views: 122

Re: Waves/Particles

Photons are the particles that are used in the particle way of thinking about light.
by Shrayes Raman
Fri Oct 11, 2019 8:41 am
Forum: Properties of Electrons
Topic: Energy Levels
Replies: 8
Views: 53

Re: Energy Levels

One photon would be emitted with each successive drop in energy level.
by Shrayes Raman
Fri Oct 11, 2019 8:37 am
Forum: Properties of Electrons
Topic: Energy of Electron
Replies: 10
Views: 95

Re: Energy of Electron

At the quantum level, the an electron can only occupy a certain energy level. This means that a specific amount of energy, i.e. a quantized amount is required to raise an electrons energy. This energy differs across the elements.
by Shrayes Raman
Fri Oct 11, 2019 8:35 am
Forum: Properties of Light
Topic: Speed of light
Replies: 9
Views: 53

Re: Speed of light

When the photo-electric experiment was done, it was tested under a vacuum. Therefore we are assuming that the speed of light is in vaccum and therefore constant.
by Shrayes Raman
Fri Oct 04, 2019 12:57 am
Forum: Limiting Reactant Calculations
Topic: Reviewing High School Chem Tips
Replies: 10
Views: 65

Re: Reviewing High School Chem Tips

I would look at Khan Academy or Boseman science.
by Shrayes Raman
Thu Oct 03, 2019 4:27 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Fundamentals E1
Replies: 4
Views: 65

Re: Fundamentals E1

The 144pm is an atomic radius. The length of the atom is the diameter. Therefore, convert from radius to diameter (r*2 = d) to get 288pm. Then multiply by Avogadro Number to get total length.
by Shrayes Raman
Thu Oct 03, 2019 4:23 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Mass
Replies: 10
Views: 87

Re: Molar Mass

Molar mass is the mass of 1 mole (6.0223 x 10^23) of what ever atom. It is represented in grams.
by Shrayes Raman
Thu Oct 03, 2019 4:21 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number?
Replies: 16
Views: 163

Re: Avogadro's Number?

Avogadro's Number is used to convert from moles to actually number of atoms and vise versa. If a problem asks for specifically the number of atoms (not in moles), then you will need to multiply the moles by Avogadro's number. If you need to convert from actual number of atoms to moles then simply di...
by Shrayes Raman
Thu Oct 03, 2019 4:14 pm
Forum: Empirical & Molecular Formulas
Topic: Law of Conservation of Mass?
Replies: 4
Views: 49

Re: Law of Conservation of Mass?

This is not possible. The Law of Conservation of Mass tells us that the mass of the reactants must be equivalent to the mass of the products. Therefore, in this example the mass of the reactants 7g and 5g add to 12g, which is not equal to 14g. This means that this is not a possible reaction.
by Shrayes Raman
Wed Oct 02, 2019 9:08 pm
Forum: SI Units, Unit Conversions
Topic: Homework 2
Replies: 7
Views: 65

Re: Homework 2

I believe that our homework will be due by the next discussion section i.e. 10/8 for 1A.

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