Search found 100 matches

by Drew Myers 4G
Wed Mar 11, 2020 5:15 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation Energy and the Rate Constant
Replies: 4
Views: 55

Activation Energy and the Rate Constant

How does a change in the activation energy affect the rate constant?
by Drew Myers 4G
Wed Mar 11, 2020 5:14 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysis
Replies: 11
Views: 91

Catalysis

What is catalysis?
by Drew Myers 4G
Wed Mar 11, 2020 5:13 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Pre-Equilibrium Method
Replies: 4
Views: 100

Pre-Equilibrium Method

What is the pre-equilibrium method for determining the reaction rate?
by Drew Myers 4G
Wed Mar 11, 2020 5:12 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Frequency Factor
Replies: 6
Views: 123

Frequency Factor

What is the frequency factor, and how is it determined?
by Drew Myers 4G
Wed Mar 11, 2020 5:11 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Temperature and Reaction Rate
Replies: 6
Views: 111

Temperature and Reaction Rate

What is the relationship between temperature and the reaction rate?
by Drew Myers 4G
Wed Mar 11, 2020 5:10 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts
Replies: 2
Views: 53

Catalysts

How do catalysts speed up reactions?
by Drew Myers 4G
Wed Mar 11, 2020 5:09 pm
Forum: *Enzyme Kinetics
Topic: Adsorption vs. Absorption
Replies: 7
Views: 130

Adsorption vs. Absorption

What is the difference between adsorption and absorption?
by Drew Myers 4G
Wed Mar 11, 2020 5:08 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Microscopic Reversibility
Replies: 3
Views: 30

Microscopic Reversibility

When Lavelle said “microscopic reversibility is being assumed” in regards to the rate constants, k and k’, what does he mean?
by Drew Myers 4G
Wed Mar 11, 2020 5:07 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Molecularity
Replies: 4
Views: 58

Molecularity

What is molecularity?
by Drew Myers 4G
Wed Mar 11, 2020 5:06 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Fast Step/Slow Step
Replies: 7
Views: 96

Fast Step/Slow Step

How do you know what step in a rxn mechanism is the slow/fast step? What does a slow/fast step even mean?
by Drew Myers 4G
Sun Mar 08, 2020 9:57 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Bimolecular Molecularity
Replies: 2
Views: 58

Bimolecular Molecularity

Can someone give an example of an elementary step that has bimoleuclar molecularity and give its rate law?
by Drew Myers 4G
Sun Mar 08, 2020 9:56 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Termolecular Molecularity
Replies: 5
Views: 83

Termolecular Molecularity

Can someone give an example of an elementary step that has termolecular molecularity and give its rate law?
by Drew Myers 4G
Sun Mar 08, 2020 9:55 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Mechanism
Replies: 1
Views: 31

Reaction Mechanism

What exactly is a reaction mechanism?
by Drew Myers 4G
Sun Mar 08, 2020 9:54 pm
Forum: Second Order Reactions
Topic: How to Derive 2nd Order Integral Rate Law
Replies: 1
Views: 40

How to Derive 2nd Order Integral Rate Law

How do you derive the 2nd order integral rate law?
by Drew Myers 4G
Sun Mar 08, 2020 9:53 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation Variables
Replies: 4
Views: 79

Arrhenius Equation Variables

Can someone explain what each of the variables in the Arrhenius equation represent?
by Drew Myers 4G
Sun Mar 01, 2020 4:22 pm
Forum: First Order Reactions
Topic: First Order Reaction Rate
Replies: 4
Views: 73

First Order Reaction Rate

How do you get to ln[R] = -kt + ln[R]initial from -(1/a)(d[R]/dt) = k[R]^n (where n = 1)?
by Drew Myers 4G
Sun Mar 01, 2020 4:18 pm
Forum: General Rate Laws
Topic: Unique Rate
Replies: 3
Views: 72

Unique Rate

How do you get the unique rate from aR -> bP (with R being reactants and P being products)?
by Drew Myers 4G
Sun Mar 01, 2020 4:14 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Method 1
Replies: 3
Views: 74

Method 1

How do you use the method of initial rates to determine n and k?
by Drew Myers 4G
Sun Mar 01, 2020 4:11 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: delta G = -nFE(cell) Variables
Replies: 2
Views: 45

delta G = -nFE(cell) Variables

What do the variables in deltaG = -nFE(cell) all mean?
by Drew Myers 4G
Sun Feb 23, 2020 9:47 pm
Forum: Van't Hoff Equation
Topic: Constants in Van’t Hoff Equation [ENDORSED]
Replies: 4
Views: 82

Constants in Van’t Hoff Equation [ENDORSED]

Are deltaS and deltaH considered constant when comparing a reaction at two different temperatures, or are other variables in the equation constant?
by Drew Myers 4G
Sun Feb 23, 2020 9:46 pm
Forum: Van't Hoff Equation
Topic: K in Van’t Hoff Equation? [ENDORSED]
Replies: 1
Views: 76

K in Van’t Hoff Equation? [ENDORSED]

In the Van’t Hoff equation, is the K temperature or the equilibrium constant?
by Drew Myers 4G
Sun Feb 23, 2020 9:42 pm
Forum: Balancing Redox Reactions
Topic: Oxidation?
Replies: 10
Views: 170

Oxidation?

How do you know which part of a redox reaction is the oxidation?
by Drew Myers 4G
Sun Feb 23, 2020 9:41 pm
Forum: Balancing Redox Reactions
Topic: Reduction?
Replies: 13
Views: 154

Reduction?

How do you know which part of a redox reaction is the reduction?
by Drew Myers 4G
Sun Feb 16, 2020 8:21 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: S = kblnW explanation
Replies: 4
Views: 60

S = kblnW explanation

Can someone explain what the variables in the equation stand for?
by Drew Myers 4G
Sun Feb 16, 2020 8:20 pm
Forum: Calculating Work of Expansion
Topic: Using Calculus to prove the equation
Replies: 4
Views: 142

Using Calculus to prove the equation

Can someone explain how to use calculus to prove
w = -PΔV?
by Drew Myers 4G
Sun Feb 16, 2020 8:16 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: S = 0
Replies: 18
Views: 318

S = 0

When does entropy equal zero?
by Drew Myers 4G
Sun Feb 16, 2020 8:11 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous
Replies: 13
Views: 167

Spontaneous

Can someone clarify how to prove when a reaction is spontaneous using Gibbs Free Energy?
by Drew Myers 4G
Sun Feb 16, 2020 8:10 pm
Forum: Van't Hoff Equation
Topic: Variable Explanations
Replies: 3
Views: 43

Variable Explanations

Can someone explain what each variable represents in the Van’t Hogg Equation?
by Drew Myers 4G
Sun Feb 02, 2020 1:30 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Definition of First Law
Replies: 9
Views: 86

Definition of First Law

Can someone give a definition of the first law of thermodynamics?
by Drew Myers 4G
Sun Feb 02, 2020 1:28 pm
Forum: Calculating Work of Expansion
Topic: 4C.13
Replies: 2
Views: 33

4C.13

How do you solve this question? It tells you the initial temperature of the water (at 400g), and the initial temperature of the ice (at 50.0g), so how do you find the final temperature when given that information?
by Drew Myers 4G
Sun Feb 02, 2020 1:27 pm
Forum: Calculating Work of Expansion
Topic: 4A.13
Replies: 2
Views: 47

4A.13

I’m confused as to how to start this question. It tells you that deltaV=0, so from that I know deltaU = q. Beyond that, I have no idea what to do.
by Drew Myers 4G
Sun Feb 02, 2020 1:23 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Systems
Replies: 4
Views: 98

Systems

Can someone differentiate an open, closed, and isolated system?
by Drew Myers 4G
Sun Feb 02, 2020 1:21 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U = Q
Replies: 8
Views: 45

Delta U = Q

When does delta U only equal to q (when does w = 0)?
by Drew Myers 4G
Sun Jan 26, 2020 1:21 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 6C.13
Replies: 3
Views: 56

6C.13

How do you solve this problem since it only gives you pKa and asks for the ranking of them as a base?
by Drew Myers 4G
Sun Jan 26, 2020 1:19 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Kw Equations
Replies: 10
Views: 168

Kw Equations

What are the equations that are equivalent to Kw (1.0 x 10^-14)?
by Drew Myers 4G
Sun Jan 26, 2020 1:17 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Method Three
Replies: 1
Views: 19

Method Three

Can someone give a quick explanation of how to use Method Three as explained in lecture?
by Drew Myers 4G
Sun Jan 26, 2020 1:16 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Method Two
Replies: 2
Views: 34

Method Two

Can someone give a quick explanation of how to use Method 2 as explained in lecture?
by Drew Myers 4G
Sun Jan 26, 2020 1:16 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Method One (Hess’s Law)
Replies: 4
Views: 55

Method One (Hess’s Law)

Can someone give a quick explanation of how to use Hess’s Law?
by Drew Myers 4G
Sun Jan 19, 2020 2:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in K when reaction is endothermic?
Replies: 2
Views: 25

Change in K when reaction is endothermic?

What happens to K when the temperature changes as a result of the reaction being endothermic?
by Drew Myers 4G
Sun Jan 19, 2020 2:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in K from Exothermic Reaction?
Replies: 2
Views: 29

Change in K from Exothermic Reaction?

What happens to K when the temperature changes as a result of the reaction being exothermic?
by Drew Myers 4G
Sun Jan 19, 2020 2:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in Pressure?
Replies: 2
Views: 41

Change in Pressure?

What happens to K when you change the pressure?
by Drew Myers 4G
Sun Jan 19, 2020 2:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in Volume?
Replies: 3
Views: 39

Change in Volume?

What happens to K when you change the volume?
by Drew Myers 4G
Sun Jan 19, 2020 2:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in Amount of P/R?
Replies: 2
Views: 29

Change in Amount of P/R?

What happens to K when you change the amount of product or reactant?
by Drew Myers 4G
Sat Jan 11, 2020 10:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating K
Replies: 5
Views: 54

Calculating K

Why do we not include solids or liquids when calculating K?
by Drew Myers 4G
Sat Jan 11, 2020 9:58 pm
Forum: Ideal Gases
Topic: Q and K
Replies: 2
Views: 30

Q and K

When do we use Q, and when do we use K?
by Drew Myers 4G
Sat Jan 11, 2020 9:54 pm
Forum: Ideal Gases
Topic: Units for K
Replies: 1
Views: 42

Units for K

Why are there no units for K?
by Drew Myers 4G
Sat Jan 11, 2020 9:52 pm
Forum: Ideal Gases
Topic: PV = nRT
Replies: 16
Views: 177

PV = nRT

What does each variable in PV = nRT stand for?
by Drew Myers 4G
Sat Jan 11, 2020 9:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Different K's
Replies: 5
Views: 90

Different K's

When are we supposed to use Kp, and when are we supposed to use Kc?
by Drew Myers 4G
Sat Dec 07, 2019 4:44 pm
Forum: Lewis Acids & Bases
Topic: 6.5
Replies: 1
Views: 42

Re: 6.5

After figuring out that the chemical equation is: H2O2 + SO3 -> H2SO5, you can determine that H2O2 is the Lewis base as it is the lone pair donor and SO3 is the Lewis acid as it is the lone pair acceptor.
by Drew Myers 4G
Sat Dec 07, 2019 4:42 pm
Forum: Identifying Acidic & Basic Salts
Topic: 6.21 (C)
Replies: 1
Views: 49

6.21 (C)

In part C, why do the NH groups act amphoteric?
by Drew Myers 4G
Sat Dec 07, 2019 4:39 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Weak Acids
Replies: 4
Views: 59

Weak Acids

How do you know if an acid is weak?
by Drew Myers 4G
Sat Dec 07, 2019 4:37 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: NH3
Replies: 1
Views: 42

NH3

Why is NH3 monodentate?
by Drew Myers 4G
Sat Dec 07, 2019 4:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: oxidation number
Replies: 1
Views: 42

Re: oxidation number

The easiest way to find the oxidation number is to substract the overall charge of the ligands from the overall charge of the coordinate compound.
by Drew Myers 4G
Sun Dec 01, 2019 8:02 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Inorganic or Organic
Replies: 6
Views: 108

Inorganic or Organic

How does one differentiate between inorganic and organic acids?
by Drew Myers 4G
Sun Dec 01, 2019 8:02 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Inorganic and organic
Replies: 3
Views: 47

Inorganic and organic

How does one differentiate between inorganic and organic bases?
by Drew Myers 4G
Sun Dec 01, 2019 7:59 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acid and Base
Replies: 5
Views: 98

Bronsted Acid and Base

Are Bronsted bases and acids determined based solely on if a proton is donated or accepted?
by Drew Myers 4G
Sun Dec 01, 2019 7:56 pm
Forum: Lewis Acids & Bases
Topic: Proton acceptor and proton donor?
Replies: 33
Views: 447

Re: Proton acceptor and proton donor?

Acids are proton donors and bases are proton acceptors.
by Drew Myers 4G
Sun Dec 01, 2019 7:55 pm
Forum: Amphoteric Compounds
Topic: Amphoteric Compound
Replies: 5
Views: 61

Amphoteric Compound

What is an amphoteric compound, and what are some examples?
by Drew Myers 4G
Sun Nov 24, 2019 6:52 pm
Forum: Trends in The Periodic Table
Topic: Pneumonic devices for trends
Replies: 4
Views: 179

Pneumonic devices for trends

Does anyone have an easy way to memorize the trends in the periodic table?
by Drew Myers 4G
Sun Nov 24, 2019 6:51 pm
Forum: Quantum Numbers and The H-Atom
Topic: Calculating quantum numbers
Replies: 4
Views: 170

Calculating quantum numbers

What is the best way to calculate quantum numbers?
by Drew Myers 4G
Sun Nov 24, 2019 6:51 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Equation
Replies: 4
Views: 226

Heisenberg Equation

What exactly does heisenberg’s equation mean empirically?
by Drew Myers 4G
Sun Nov 24, 2019 6:50 pm
Forum: DeBroglie Equation
Topic: Lambda = h/p
Replies: 1
Views: 103

Lambda = h/p

What exactly does lambda = h/p mean empirically?
by Drew Myers 4G
Sun Nov 24, 2019 6:49 pm
Forum: Einstein Equation
Topic: e = hv
Replies: 1
Views: 149

e = hv

What exactly does E = hv mean empirically?
by Drew Myers 4G
Sun Nov 17, 2019 4:29 pm
Forum: Dipole Moments
Topic: London Forces
Replies: 4
Views: 58

London Forces

Am I right in saying that all molecules have london dispersion forces? If so, why is this the case?
by Drew Myers 4G
Sun Nov 17, 2019 4:28 pm
Forum: Dipole Moments
Topic: Ion-dipole molecular force
Replies: 3
Views: 53

Ion-dipole molecular force

What kinds of molecules are bonded with an ion-dipole molecular force?
by Drew Myers 4G
Sun Nov 17, 2019 4:26 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen Bonds
Replies: 6
Views: 86

Hydrogen Bonds

Which atoms can have hydrogen bonds?
by Drew Myers 4G
Sun Nov 17, 2019 4:23 pm
Forum: Sigma & Pi Bonds
Topic: explanation
Replies: 2
Views: 45

Re: explanation

Sigma bonds are formed by head to head overlapping orbitals, whereas pi bonds are formed by the lateral overlapping. Additionally, sigma bonds are stronger than pi bonds. Lastly, sigma bonds can be formed between both s and p orbitals whereas pi bonds are mostly formed between p and d orbitals.
by Drew Myers 4G
Sun Nov 17, 2019 4:23 pm
Forum: Sigma & Pi Bonds
Topic: Sigma V Pi
Replies: 5
Views: 113

Re: Sigma V Pi

Sigma bonds are formed by head to head overlapping orbitals, whereas pi bonds are formed by the lateral overlapping. Additionally, sigma bonds are stronger than pi bonds. Lastly, sigma bonds can be formed between both s and p orbitals whereas pi bonds are mostly formed between p and d orbitals.
by Drew Myers 4G
Sun Nov 10, 2019 4:36 pm
Forum: Lewis Structures
Topic: More than 8 electrons in structure?
Replies: 4
Views: 75

More than 8 electrons in structure?

Is the presence of the d-block the reason why atoms such as Xenon can go beyond the octet rule?
by Drew Myers 4G
Sun Nov 10, 2019 4:32 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity
Replies: 9
Views: 265

Electronegativity

So just to be sure, electronegativity follows the same trend as ionization energy and electron affinity on the periodic table right? If not, what trend does it follow?
by Drew Myers 4G
Sun Nov 10, 2019 4:27 pm
Forum: Bond Lengths & Energies
Topic: London Forces
Replies: 6
Views: 71

Re: London Forces

All compounds can have an instantaneous dipole moment (even ions) meaning that London Forces exist for all compounds.
by Drew Myers 4G
Sun Nov 10, 2019 4:23 pm
Forum: Dipole Moments
Topic: Difference between two attractive forces
Replies: 1
Views: 25

Re: Difference between two attractive forces

The main difference between the two is that dipole-dipole forces occur among molecules with dipole moments whereas London forces occur due to instantaneous dipoles that form in atoms or nonpolar molecules. I'm not sure how exactly you can tell if a compound has a dipole-dipole force from the chemica...
by Drew Myers 4G
Sun Nov 10, 2019 4:19 pm
Forum: Dipole Moments
Topic: What's a dipole
Replies: 4
Views: 49

Re: What's a dipole

A dipole is a pair of equal and oppositely charged or magnetized poles separated by a distance.
by Drew Myers 4G
Sun Nov 03, 2019 11:40 am
Forum: Coordinate Covalent Bonds
Topic: Single, double, and triple bonds
Replies: 6
Views: 82

Re: Single, double, and triple bonds

No. It depends on the radii of the elements themselves.
by Drew Myers 4G
Sun Nov 03, 2019 11:37 am
Forum: Electronegativity
Topic: Electronegativity Correlations
Replies: 3
Views: 74

Re: Electronegativity Correlations

Yes. Ionization energy and electron affinity positively correlate with electronegativity since the periodic trends align.
by Drew Myers 4G
Sun Nov 03, 2019 11:33 am
Forum: Bond Lengths & Energies
Topic: Strength of Bonds
Replies: 16
Views: 223

Strength of Bonds

Are longer bonds or shorter bonds stronger?
by Drew Myers 4G
Sun Nov 03, 2019 11:29 am
Forum: Ionic & Covalent Bonds
Topic: Drawing Ionic Compunds
Replies: 7
Views: 188

Drawing Ionic Compunds

How exactly are we supposed to draw ionic compunds? I know it was briefly addressed in class, but I’m still confused.
by Drew Myers 4G
Sun Nov 03, 2019 11:23 am
Forum: Lewis Structures
Topic: Atoms that can accept more than 8 Valence E-
Replies: 3
Views: 71

Atoms that can accept more than 8 Valence E-

Why are some atoms able to break the octet rule and accept more than 8 valence electrons?
by Drew Myers 4G
Sun Oct 27, 2019 2:11 pm
Forum: Trends in The Periodic Table
Topic: The Inert Pair Effect
Replies: 2
Views: 35

Re: The Inert Pair Effect

The reason for the effect is the inertness of the inner s electrons due to poor shielding.
by Drew Myers 4G
Sun Oct 27, 2019 2:09 pm
Forum: Trends in The Periodic Table
Topic: 1F.9
Replies: 1
Views: 40

Re: 1F.9

The first ionization energy for sulfur and phosphorus atoms are nearly the same, despite sulfur having a larger Zeff; this is due to greater electron-electron repulsions in S, making the energy of the outermost electrons higher than predicted. Once the first electron is removed, the Zeff becomes the...
by Drew Myers 4G
Sun Oct 27, 2019 2:05 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.17b
Replies: 1
Views: 36

Re: 1E.17b

Since 4s orbitals have lower energy, they are filled first. When 3D orbitals are filled, 4s is no longer lower in energy.
by Drew Myers 4G
Sun Oct 27, 2019 2:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.9
Replies: 1
Views: 38

Re: 1E.9

For part A, see if the quantum numbers are invalid. n=4, which means l can only be 0,1,2, or 3, and since it’s 2, l is valid. M(l) can only be -l through l, so it is valid as it is -1. Lastly, m(s) can be either -1/2 or +1/2, so it is valid. For part B, it is not possible because l = 0, so m(l) must...
by Drew Myers 4G
Sun Oct 27, 2019 1:57 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1F.19: s-block
Replies: 2
Views: 54

Re: 1F.19: s-block

S-block metals have lower ionization energies than p-block metals, which means that s-block metals tend to form cations as they are more willing to give away electrons. Thus, they are more reactive.
by Drew Myers 4G
Sat Oct 19, 2019 10:15 pm
Forum: Photoelectric Effect
Topic: Intensity of Light
Replies: 5
Views: 90

Re: Intensity of Light

The amount of energy is not what causes the photoelectric effect. It is caused by the wavelength of the light used.
by Drew Myers 4G
Sat Oct 19, 2019 10:13 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 43
Views: 4685

Re: E=hv

E represents the energy of the photon. The energy required to remove an electron is known as the work function/threshold energy and is not present in this equation.
by Drew Myers 4G
Sat Oct 19, 2019 9:40 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Which Element to Use in Electron Configurations
Replies: 5
Views: 85

Which Element to Use in Electron Configurations

When doing electron configurations for multi-electron atoms, do we always use the noble gas of the previous line to shorten the configuration? Why can't we use the atom that comes before the atom we're doing the configuration for?
by Drew Myers 4G
Sat Oct 19, 2019 9:37 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Purpose of the Equation
Replies: 9
Views: 118

Purpose of the Equation

So after hearing both a lecture and a discussion section about this equation, I am still incredibly confused as to what its purpose/use is. What is the purpose of this equation?
by Drew Myers 4G
Sat Oct 19, 2019 9:35 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Letter Names
Replies: 4
Views: 69

Re: Letter Names

After doing a little online research, the s, p, d, and f letters do have a history that can be discovered through this link: https://pubs.acs.org/doi/pdf/10.1021/ed084p757
by Drew Myers 4G
Sun Oct 13, 2019 3:29 pm
Forum: Photoelectric Effect
Topic: Mass of Neutron
Replies: 1
Views: 41

Mass of Neutron

What is the mass of a neutron, and when will we need to use it in this chapter/ever?
by Drew Myers 4G
Sun Oct 13, 2019 3:27 pm
Forum: Properties of Light
Topic: 1A.5
Replies: 3
Views: 52

1A.5

What is the order of energy from increasing to decreasing of gamma rays, x rays, UV light, visible light, and microwaves?
by Drew Myers 4G
Sun Oct 13, 2019 3:23 pm
Forum: Einstein Equation
Topic: Units
Replies: 17
Views: 944

Re: Units

Will there ever be a time where we need to use megagrams or gigagrams or will we likely only go as big as kilograms?
by Drew Myers 4G
Sun Oct 13, 2019 3:16 pm
Forum: Photoelectric Effect
Topic: Work Function for the Modules
Replies: 1
Views: 59

Re: Work Function for the Modules

The energy required to remove an electron is the work function, which they give you as 150.6 kJ/mol. All you need to do is convert that value into Joules, which is done by multiplying 150.6kJ/mol x 1000 g/kg = 150600 J/mol. Then divide that value by Avogadro's number (6.022 x 10^23 molecules/mol) to...
by Drew Myers 4G
Sun Oct 13, 2019 3:10 pm
Forum: Properties of Electrons
Topic: Lyman and Balmer Series
Replies: 2
Views: 56

Re: Lyman and Balmer Series

As you said, there are no other differences than them being in the visible light and UV regions (which also means that they have different wavelengths).
by Drew Myers 4G
Sat Oct 05, 2019 12:35 am
Forum: Limiting Reactant Calculations
Topic: M 15B
Replies: 1
Views: 61

M 15B

For problem M15 part B, how would you determine the mass of aluminum chloride that can be produced by the reactants? My answer is different from the one in the odd numbered examples solutions and I don't know why.
by Drew Myers 4G
Sat Oct 05, 2019 12:30 am
Forum: Balancing Chemical Reactions
Topic: H 7 a.
Replies: 3
Views: 87

Re: H 7 a.

To find the stoichiometric coefficients, simply balance the chemical equation.
Before balance: Ca + H2O -> H2 + Ca(OH)2
Balanced: Ca + 2H20 -> H2 + Ca(OH)2
The stoichiometric coefficients are 1, 2, 1 and 1.
by Drew Myers 4G
Sat Oct 05, 2019 12:27 am
Forum: Molarity, Solutions, Dilutions
Topic: G 5a.
Replies: 1
Views: 81

Re: G 5a.

In order to get the volume needed, you must first find the molarity of Na2CO3 : (2.111g)/(105.99g.mol^-1 x 0.2500L) = .07967 mol Na2CO3. From there, determine the mol of Na+ ions present in Na2CO3 (there are 2). Then, solve for the volume by dividing the mol of Na+ given by the molarity found before...
by Drew Myers 4G
Sat Oct 05, 2019 12:20 am
Forum: Molarity, Solutions, Dilutions
Topic: G 21a.
Replies: 1
Views: 51

Re: G 21a.

In order to find the mol K+ in the problem, you have to first convert the .500 g KCl, K2S, and K3PO4 into mol instead of grams using their molar masses which can be determined from the periodic table. After doing so, look at each compound and see how many mol of potassium ions are in each (KCl has 1...
by Drew Myers 4G
Sat Oct 05, 2019 12:12 am
Forum: Significant Figures
Topic: Sig Figs in % Yield
Replies: 10
Views: 875

Sig Figs in % Yield

Imagine that a problem asks you to find the percent yield but wants 2 sig figs, and the end answer you get is 63.5%. Would that round up to 64% or down to 63%, and why?

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