Search found 101 matches

by Ayushi2011
Mon Mar 16, 2020 6:18 pm
Forum: General Rate Laws
Topic: rate laws
Replies: 8
Views: 125

Re: rate laws

Yes, rate is determine by the slowest step.
by Ayushi2011
Mon Mar 16, 2020 6:16 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Temperature vs. activation energy
Replies: 5
Views: 334

Re: Temperature vs. activation energy

More T, more activation energy because more collisions.
by Ayushi2011
Mon Mar 16, 2020 6:13 pm
Forum: Phase Changes & Related Calculations
Topic: state functions
Replies: 9
Views: 186

Re: state functions

State functions are path-independent.
by Ayushi2011
Mon Mar 16, 2020 6:12 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Exothermic rxns and heat
Replies: 6
Views: 101

Re: Exothermic rxns and heat

Q is negative as heat is being released.
by Ayushi2011
Mon Mar 16, 2020 6:12 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Final Exam #15
Replies: 3
Views: 192

Re: Final Exam #15

You use the van't hoff equation.
by Ayushi2011
Mon Mar 16, 2020 6:10 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Kelvin or Celsius?
Replies: 47
Views: 967

Re: Kelvin or Celsius?

Kelvin is always the unit for such equations.
by Ayushi2011
Mon Mar 16, 2020 6:09 pm
Forum: Van't Hoff Equation
Topic: Entropy
Replies: 2
Views: 155

Re: Entropy

I would calculate deltaH and then use deltaG = deltaH - TdeltaS to find entropy.
by Ayushi2011
Mon Mar 16, 2020 6:08 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U
Replies: 4
Views: 107

Re: Delta U

Depends on whether work is done or work is being done on the system.
by Ayushi2011
Mon Mar 16, 2020 6:07 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pH of acids
Replies: 11
Views: 300

Re: pH of acids

Strong acids dissociate completely, while weak acids don't which affects the ph.
by Ayushi2011
Mon Mar 16, 2020 6:06 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Approximating X
Replies: 13
Views: 149

Re: Approximating X

Use the 5% rule, if X is less than that then we can approximate.
by Ayushi2011
Mon Mar 16, 2020 6:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ATP QUESTION ON FINAL
Replies: 9
Views: 210

Re: ATP QUESTION ON FINAL

K depended on ADP, basically the same as ADP.
by Ayushi2011
Mon Mar 16, 2020 6:05 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: method
Replies: 4
Views: 103

Re: method

Pre equilibrium is probably the method i would use.
by Ayushi2011
Mon Mar 16, 2020 6:04 pm
Forum: Second Order Reactions
Topic: 2nd order
Replies: 6
Views: 172

Re: 2nd order

When the rate is affected by the concentration of two first-order reactants, it is a second order reaction.
by Ayushi2011
Mon Mar 16, 2020 6:03 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Catalyst
Replies: 3
Views: 64

Re: Catalyst

A catalyst will first appear to the left as a reactant, and then as a product in the following reactions because it speeds up the reaction but doesn't get used up.
by Ayushi2011
Mon Mar 16, 2020 6:02 pm
Forum: First Order Reactions
Topic: size
Replies: 6
Views: 111

Re: size

No, only stoichiometric coeffecients affect the rate of a reaction, not the size of the reactant molecules.
by Ayushi2011
Mon Mar 16, 2020 6:00 pm
Forum: Zero Order Reactions
Topic: 0 order
Replies: 7
Views: 118

Re: 0 order

It is independent of the concentration of the reactants.
by Ayushi2011
Mon Mar 16, 2020 5:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: calculating standard cell potential
Replies: 6
Views: 90

Re: calculating standard cell potential

You would do standard potential of cathode minus the standard potential of anode.
by Ayushi2011
Mon Mar 16, 2020 5:58 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst K vs Q
Replies: 5
Views: 104

Re: Nernst K vs Q

You use K when the reaction is at equilibrium, and Q when the reaction is not.
by Ayushi2011
Sat Mar 14, 2020 3:59 pm
Forum: Phase Changes & Related Calculations
Topic: Negative Work
Replies: 18
Views: 301

Re: Negative Work

When a system does work, the value of work is negative.
by Ayushi2011
Sat Mar 14, 2020 3:57 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Gibbs free energy
Replies: 9
Views: 143

Re: Gibbs free energy

G* means a substance is in its standard state.
by Ayushi2011
Sat Mar 14, 2020 3:54 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Steps to solve calorimeter problem
Replies: 3
Views: 101

Re: Steps to solve calorimeter problem

Use q=mcdeltaT for these problems. Take into account phase changes as well.
by Ayushi2011
Sat Mar 14, 2020 3:18 pm
Forum: Van't Hoff Equation
Topic: what does it do?
Replies: 13
Views: 248

Re: what does it do?

It relates equilibrium constant to temperature.
by Ayushi2011
Sat Mar 14, 2020 3:09 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: predicting entropy
Replies: 3
Views: 74

Re: predicting entropy

More the disorganization, more is the entropy which is why COF2 will have more entropy compared to BF3.
by Ayushi2011
Sat Mar 14, 2020 3:08 pm
Forum: *Nucleophiles
Topic: FInal
Replies: 6
Views: 207

Re: FInal

Do try and read and understand what the textbook says.
by Ayushi2011
Sat Mar 14, 2020 2:54 pm
Forum: General Rate Laws
Topic: Hw 7A.13
Replies: 8
Views: 129

Re: Hw 7A.13

Yes, because the power will be 1, making it a first order reaction.
by Ayushi2011
Sat Mar 14, 2020 2:49 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Textbook question 7.17
Replies: 4
Views: 71

Re: Textbook question 7.17

The slowest step is the rate determining step, if the catalyst doesn't affect this step, the rate of reaction doesn't change.
by Ayushi2011
Sat Mar 14, 2020 1:42 pm
Forum: General Rate Laws
Topic: Rate-determining step
Replies: 7
Views: 128

Re: Rate-determining step

They usually tell us which is the slow and fast step.
by Ayushi2011
Sat Mar 14, 2020 1:41 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts
Replies: 5
Views: 35

Re: Catalysts

It is introduced as a reactant, and then produced as a product in the following equations showing that it remains unconsumed in the reaction.
by Ayushi2011
Sat Mar 14, 2020 1:40 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation energy
Replies: 7
Views: 55

Re: Activation energy

Since its energy, its unit can be Joules or kJ.
by Ayushi2011
Sat Mar 14, 2020 1:39 pm
Forum: Zero Order Reactions
Topic: zero order reactions
Replies: 5
Views: 63

Re: zero order reactions

A zero order reaction is independent of concentration and only depends on the rate constant.
by Ayushi2011
Thu Jan 30, 2020 4:01 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Kw Equations
Replies: 10
Views: 153

Re: Kw Equations

[h3O+] + [OH-] = kw = 1x10^-14
by Ayushi2011
Thu Jan 30, 2020 3:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ka and Kb
Replies: 10
Views: 103

Re: Ka and Kb

Greater than 10^3 is a strong acid.
by Ayushi2011
Thu Jan 30, 2020 3:57 pm
Forum: Phase Changes & Related Calculations
Topic: Molar Heat Capacity at Cp s. Cv
Replies: 4
Views: 61

Re: Molar Heat Capacity at Cp s. Cv

P is the constant pressure and V indicates temperature.
by Ayushi2011
Thu Jan 30, 2020 3:56 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Equilibrium shift by pressure
Replies: 7
Views: 79

Re: Equilibrium shift by pressure

If the system is compressed, the reaction proceeds in the direction with the least moles of the gas, which can be either reactants or products.
by Ayushi2011
Thu Jan 30, 2020 3:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Negative pH
Replies: 9
Views: 65

Re: Negative pH

Very strong acids have extremely low PH, sometimes it can be negative.
by Ayushi2011
Thu Jan 30, 2020 3:52 pm
Forum: Ideal Gases
Topic: Inert Gas
Replies: 12
Views: 166

Re: Inert Gas

Inert gases won't cause any change in the chemical equilibrium (equilibrium constant) since they are unreactive.
by Ayushi2011
Thu Jan 30, 2020 3:51 pm
Forum: Phase Changes & Related Calculations
Topic: Units
Replies: 16
Views: 147

Re: Units

We record temperature in terms of how it changes, change in a celsius is same as a change in a kelvin.
by Ayushi2011
Thu Jan 30, 2020 3:50 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond enthalpies
Replies: 4
Views: 41

Re: Bond enthalpies

Breaking a bond is endothermic and forming one is exothermic, so it can be either.
by Ayushi2011
Fri Jan 24, 2020 12:24 pm
Forum: Ideal Gases
Topic: ICE table approximation
Replies: 10
Views: 78

Re: ICE table approximation

If K value is very small, we can approximate.
by Ayushi2011
Fri Jan 24, 2020 12:21 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: pKa and pKb
Replies: 17
Views: 202

Re: pKa and pKb

when you are given Ka and Kb, you take -log of that to find pka and pkb. Pka + Pkb = 14
by Ayushi2011
Fri Jan 24, 2020 12:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Ka and Kb
Replies: 10
Views: 122

Re: Ka and Kb

Strong acids and bases do have Ka and Kb.
by Ayushi2011
Fri Jan 24, 2020 12:19 pm
Forum: Phase Changes & Related Calculations
Topic: Steam vs. Boiling Water
Replies: 10
Views: 127

Re: Steam vs. Boiling Water

To put it in simpler terms, changing the state of a substance releases a lot more energy than the substance remaining in the same state. Water at 100C releases less heat than steam because the change in state from water to steam (vaporisation), releases more energy.
by Ayushi2011
Fri Jan 24, 2020 12:17 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Changes in Pressure
Replies: 9
Views: 89

Re: Changes in Pressure

Increasing pressure shifts the reaction to the side with the fewer moles of gas according to Le Chatelier's principle.
by Ayushi2011
Fri Jan 24, 2020 12:15 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Molar concentration of H3O
Replies: 6
Views: 64

Re: Molar concentration of H3O

If we assume that the concentrations of h3o+ and oh- is the same, the answer will be square root of kw which is 10^-7.
by Ayushi2011
Fri Jan 24, 2020 12:13 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: solvent
Replies: 10
Views: 56

Re: solvent

Only gaseous and aqueous substances will be included in the equilibrium constant equations.
by Ayushi2011
Sun Jan 12, 2020 8:01 am
Forum: Ideal Gases
Topic: PV = nRT
Replies: 16
Views: 161

Re: PV = nRT

P stands for pressure, V is volume, n is number of moles, R is ideal gas constant, T is temperature,
by Ayushi2011
Sun Jan 12, 2020 8:00 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 19
Views: 244

Re: Le Chatelier's Principle

The principle states that every time there is a shift from equilibrium, the effect of the shift will be counteracted to maintain equilibrium.
by Ayushi2011
Sun Jan 12, 2020 7:58 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Different K's
Replies: 5
Views: 81

Re: Different K's

Kp is equilibrium constant for pressure whereas Kc is for concentrations.
by Ayushi2011
Sun Dec 08, 2019 1:13 am
Forum: Sigma & Pi Bonds
Topic: Ionic bond --> sigma and pi bonds
Replies: 8
Views: 303

Re: Ionic bond --> sigma and pi bonds

Ionic bonds don't form sigma bonds, it is only for shared electrons.
by Ayushi2011
Sun Dec 08, 2019 1:10 am
Forum: Sigma & Pi Bonds
Topic: Hybridization for p
Replies: 2
Views: 115

Re: Hybridization for p

Pi bonds only use unhybridized p orbitals.
by Ayushi2011
Sun Dec 08, 2019 1:09 am
Forum: Dipole Moments
Topic: Melting and Boiling Points
Replies: 9
Views: 246

Re: Melting and Boiling Points

ionic dipole is stronger than hydrogen bonding, so needs a higher melting point in order to break the bonds.
by Ayushi2011
Sun Dec 08, 2019 1:08 am
Forum: Electronegativity
Topic: Electronegativity of Atoms We Should Know About
Replies: 3
Views: 148

Re: Electronegativity of Atoms We Should Know About

The trend is that electronegativity increases as we move across the period and decreases as we move down the group.
by Ayushi2011
Sun Dec 08, 2019 1:06 am
Forum: Amphoteric Compounds
Topic: 6A.17
Replies: 4
Views: 128

Re: 6A.17

Non metal oxides generally form acids and metal oxides form strong bases.
by Ayushi2011
Fri Dec 06, 2019 3:41 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Periodic Trends
Replies: 8
Views: 215

Re: Periodic Trends

smaller cations with less electron cloud have higher polarising power whereas larger anions with a large electron cloud and distortion have more polarizability.
by Ayushi2011
Fri Dec 06, 2019 3:39 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Resonance
Replies: 3
Views: 137

Re: Resonance

I don't think resonance has got to do with strength per se. It is more about stabilizing the atom by delocalising the electrons. it also maintains a constant bond length in the compound.
by Ayushi2011
Fri Dec 06, 2019 3:37 pm
Forum: Lewis Acids & Bases
Topic: electron withdrawing
Replies: 2
Views: 53

Re: electron withdrawing

Higher the electronegativity of an atom, the more electron it draws, making the acid stronger.
by Ayushi2011
Fri Dec 06, 2019 3:35 pm
Forum: Hybridization
Topic: hybridization of lone pairs
Replies: 4
Views: 59

Re: hybridization of lone pairs

We mainly look at regions of electron density rather than bonding or lone pairs, in case of hybridization.
by Ayushi2011
Fri Dec 06, 2019 3:34 pm
Forum: Dipole Moments
Topic: Melting and Boiling Points
Replies: 9
Views: 246

Re: Melting and Boiling Points

I think the hierarchy is ionic>ionic-dipole>hydrogen>dipole-dipole>london forces (in terms of strength of interaction). Higher the strength, higher the temperature it needs to break the bond so higher melting point.
by Ayushi2011
Fri Dec 06, 2019 3:32 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 3
Views: 118

Re: Resonance

I believe resonance stabilises a compound. Strength depends on the length of the bond, and other factors like electron repulsion, radius etc.
by Ayushi2011
Fri Dec 06, 2019 3:30 pm
Forum: Ionic & Covalent Bonds
Topic: intermolecular vs intramolecular
Replies: 8
Views: 196

Re: intermolecular vs intramolecular

inter is between two molecules and intra is within the same molecule.
by Ayushi2011
Sun Nov 17, 2019 4:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: lone pairs
Replies: 3
Views: 33

Re: lone pairs

Lone pair-lone pair electron repulsion is the highest, so they need to be placed away from each other as we want minimum repulsion for most stability.
by Ayushi2011
Sun Nov 17, 2019 4:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Do we have to memorize the names of shapes and/or the bond angles?
Replies: 7
Views: 90

Re: Do we have to memorize the names of shapes and/or the bond angles?

I think we memorise shapes and bond angles relative to each other, like why would a particular bond angle be smaller than another etc.
by Ayushi2011
Sun Nov 17, 2019 4:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: regions of electron density
Replies: 10
Views: 86

Re: regions of electron density

Regions where electrons are found, as the name suggests, the region where the electrons are most dense around an atom.
by Ayushi2011
Sun Nov 17, 2019 4:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR on the test or final
Replies: 4
Views: 77

Re: VSEPR on the test or final

It covers both, whatever covered after midterm!
by Ayushi2011
Sun Nov 17, 2019 4:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion
Replies: 6
Views: 63

Re: Repulsion

Bonding pairs have least repulsion, then lone pairs with bonding pairs, and lone pairs with each other have the highest repulsion.
by Ayushi2011
Sun Nov 17, 2019 4:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs and bond angles
Replies: 4
Views: 38

Re: Lone pairs and bond angles

Lone pair decreases bond angle because it causes repulsion with other lone pairs and bonding pairs.
by Ayushi2011
Sun Nov 17, 2019 4:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Dipole moments
Replies: 4
Views: 67

Re: Dipole moments

The arrow points to the atom that pulls electrons towards itself, so the most electronegative one.
by Ayushi2011
Sun Nov 17, 2019 4:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Do we name things by their electron geometry or molecular geometry?
Replies: 2
Views: 32

Re: Do we name things by their electron geometry or molecular geometry?

We name things according to molecular geometry because electron geometry takes into account lone pairs. We don't take lone pairs into account while writing the structure, just to find out how to minimize repulsion.
by Ayushi2011
Sun Nov 17, 2019 4:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR repulsion model
Replies: 8
Views: 124

Re: VSEPR repulsion model

If there is repulsion between lone pairs, it would change the structure of the atom. We need to figure out how the lone pairs need to be arranged in each structure to minimise repulsion and find most stability.
by Ayushi2011
Sun Nov 17, 2019 4:17 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: AXE formula
Replies: 32
Views: 4706

Re: AXE formula

This notation lets us know the number of bonding pairs and lone pairs which makes it easier to draw structures.
by Ayushi2011
Sun Nov 03, 2019 5:49 pm
Forum: Einstein Equation
Topic: eV
Replies: 4
Views: 186

Re: eV

M stands for mega with value 10^6.
by Ayushi2011
Sun Nov 03, 2019 5:48 pm
Forum: *Black Body Radiation
Topic: Info for Midterm
Replies: 10
Views: 314

Re: Info for Midterm

Won't be tested on the midterm.
by Ayushi2011
Sun Nov 03, 2019 5:47 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: What are the octet exceptions?
Replies: 11
Views: 127

Re: What are the octet exceptions?

Generally d-block elements because the d-orbital can accommodate more valence electrons.
by Ayushi2011
Sun Nov 03, 2019 5:46 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: When would 3d orbital be filled before the 4s orbital?
Replies: 8
Views: 76

Re: When would 3d orbital be filled before the 4s orbital?

4s is lower in energy than 3d, causing it to get filled up first.
by Ayushi2011
Sun Nov 03, 2019 5:40 pm
Forum: DeBroglie Equation
Topic: When to use the DeBroglie equation?
Replies: 6
Views: 93

Re: When to use the DeBroglie equation?

Any particle with wavelike properties that has momentum. They will give us the mass and velocity.
by Ayushi2011
Sun Nov 03, 2019 5:39 pm
Forum: Lewis Structures
Topic: Dino Nuggets - 12C
Replies: 3
Views: 56

Re: Dino Nuggets - 12C

We always want to put the least electronegative atom in the center.
by Ayushi2011
Sun Oct 27, 2019 10:17 am
Forum: Trends in The Periodic Table
Topic: atomic Radii
Replies: 11
Views: 127

Re: atomic Radii

Adding more electrons would definitely increase the atomic radius because the electrons keep getting added to the outermost shell.
by Ayushi2011
Sun Oct 27, 2019 10:14 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals in relation to arrows
Replies: 10
Views: 214

Re: Orbitals in relation to arrows

A spin quantum number of +1/2 means the spin is in the upward direction, and vice versa for -1/2. Two electrons of opposite spin are always placed in one orbital
(by Hund's rule)
by Ayushi2011
Sat Oct 26, 2019 8:46 pm
Forum: Trends in The Periodic Table
Topic: Stable Structures
Replies: 5
Views: 97

Re: Stable Structures

Formal charge needs to be calculated. If the formal charge of the central atom is 0, the atom is stable.
by Ayushi2011
Sat Oct 26, 2019 8:45 pm
Forum: Properties of Electrons
Topic: Mass of an Electron
Replies: 14
Views: 230

Re: Mass of an Electron

The mass of an electron will always be given to us, because it is a set mass.
by Ayushi2011
Sat Oct 26, 2019 8:44 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Polar v nonPolar
Replies: 4
Views: 703

Re: Polar v nonPolar

You can also determine polarity from structure. If the structure of the compound is symmetric in terms of distribution of elements around the central atom, it is non polar. If the compound has a charge and is asymmetric, it is polar.
by Ayushi2011
Thu Oct 17, 2019 3:58 pm
Forum: Photoelectric Effect
Topic: Unit of measurements for E=hv
Replies: 6
Views: 83

Re: Unit of measurements for E=hv

The unit is Joules, but in relation to photoelectric effect it is Joules per photon, since that is the particle whose energy we're trying to calculate.
by Ayushi2011
Thu Oct 17, 2019 3:56 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Atomic Radius
Replies: 18
Views: 172

Re: Atomic Radius

The value of atomic radius will always be given to us.
by Ayushi2011
Thu Oct 17, 2019 3:55 pm
Forum: DeBroglie Equation
Topic: DeBroglie Equation Use
Replies: 5
Views: 88

Re: DeBroglie Equation Use

The equation is used to calculate wavelength of a particle with linear momentum. The equation is wavelength(lambda) = h/m*v where h is Planck's constant (6.626*10^-34 Js) , m = mass of particle, v = velocity with which the particle is moving. the formula could also be lambda = h/p(momentum) as momen...
by Ayushi2011
Thu Oct 17, 2019 3:51 pm
Forum: Quantum Numbers and The H-Atom
Topic: Ryberg's Constant
Replies: 7
Views: 102

Re: Ryberg's Constant

Do use the one given by Dr. Lavelle. Since Rydberg's constant is frequency, the unit is s^-1 or Hz.
by Ayushi2011
Thu Oct 17, 2019 3:51 pm
Forum: Quantum Numbers and The H-Atom
Topic: Ryberg's Constant
Replies: 7
Views: 102

Re: Ryberg's Constant

Do use the one given by Dr. Lavelle. Since Rydberg's constant is frequency, the unit is s^-1 or Hz.
by Ayushi2011
Thu Oct 17, 2019 3:49 pm
Forum: Einstein Equation
Topic: unit of energy
Replies: 7
Views: 574

Re: unit of energy

It is a unit of energy. 1keV = 1.602 * 10^-16 J. Normally an eV = 1.602 *n10^-19 J but since this is Kilo electron volt, the power to 10 is raised to -16.
by Ayushi2011
Thu Oct 17, 2019 3:47 pm
Forum: Properties of Light
Topic: EM Spectrum
Replies: 3
Views: 64

Re: EM Spectrum

I think you need to know which series corresponds to which energy level and region (UV, infrared, etc). It might help to go over wavelengths of some of the regions as well.
by Ayushi2011
Thu Oct 10, 2019 11:44 pm
Forum: Balancing Chemical Reactions
Topic: Importance of the State of Molecules
Replies: 6
Views: 323

Re: Importance of the State of Molecules

Doesn't hurt to write it down because its just additional helpful information!
by Ayushi2011
Thu Oct 10, 2019 11:33 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 Grading
Replies: 12
Views: 449

Re: Test 1 Grading

I had no idea we get 10 points for just being there!
by Ayushi2011
Thu Oct 10, 2019 11:31 pm
Forum: Limiting Reactant Calculations
Topic: Can't Find Limiting Reactant
Replies: 4
Views: 233

Re: Can't Find Limiting Reactant

hey! You first have to balance the equation = 2AL + 6HCL --> 2ALCL3 + 3H2. You then calculate how many grams of product does each reactant give by calculating molar masses and using molecular weights of each. Using Al, we get: (5.43gAl/26.981g/molAl)*(2mol/2mol)*133.481g/molAlCl3 = 26.86g of AlCl3 D...
by Ayushi2011
Thu Oct 10, 2019 11:16 pm
Forum: Empirical & Molecular Formulas
Topic: Mass Percentage Question
Replies: 9
Views: 485

Re: Mass Percentage Question

I'd start by first finding the how many elements are there in the compound, and then find the molecular mass of the compound. Since we know the number of elements, we divide the molecular mass of each element by the total mass of the compound we just found, to get mass percentage.
by Ayushi2011
Wed Oct 09, 2019 6:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 3456

Re: Week 2 Homework Problems [ENDORSED]

You can do either! I did both just to review all topics.
by Ayushi2011
Sat Oct 05, 2019 3:53 pm
Forum: Limiting Reactant Calculations
Topic: M5
Replies: 2
Views: 83

M5

Could someone explain how to find the excess reactant in M5? I'm slightly confused.
by Ayushi2011
Sat Oct 05, 2019 3:52 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 3456

Re: Week 2 Homework Problems [ENDORSED]

He specified to do either fundamentals or quantum world or both for Homework 2!
by Ayushi2011
Sat Oct 05, 2019 3:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 3456

Re: Week 2 Homework Problems [ENDORSED]

He specified to do either fundamentals or quantum world or both for Homework 2!
by Ayushi2011
Thu Oct 03, 2019 11:17 pm
Forum: Molarity, Solutions, Dilutions
Topic: E 27
Replies: 6
Views: 108

Re: E 27

For part b, I'd find the moles of a kilogram of water which is 1000g/(18.02g/mol) which is 55.49 moles. Since 1 mole has 6.022x10^23 molecules, 55.49 moles will have 55.49x(6.023x10^23)molecules which is 3.34x10^25 molecules.
by Ayushi2011
Thu Oct 03, 2019 4:04 pm
Forum: Empirical & Molecular Formulas
Topic: Tips for Finding Which Number to Multiply a Decimal By to Get a Whole Number
Replies: 10
Views: 243

Re: Tips for Finding Which Number to Multiply a Decimal By to Get a Whole Number

What generally works for me is trial and error. I sort of keep multiplying low value numbers until I find one that converts all the decimals into whole numbers, or at least close. It may not be the most efficient way but it definitely does give me the right answer.

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