## Search found 87 matches

Sun Jan 24, 2021 11:34 pm
Forum: Phase Changes & Related Calculations
Topic: when to assume x is insignificant
Replies: 16
Views: 28

### Re: when to assume x is insignificant

When the k value is less than 10^-4 we can assume the x value is insignificant. Also if the percent ionization is less than 5%, we know the x value is insignificant.
Sun Jan 24, 2021 11:32 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature Given in Problems
Replies: 6
Views: 12

### Re: Temperature Given in Problems

I believed that knowing the actual temperature isn't necessarily important for the calculations we have been doing but it is important to know if temperature has changed or not because if temperature changes, then the kb/ka value will change as well.
Sun Jan 24, 2021 11:30 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Sapling 9
Replies: 9
Views: 37

### Re: Sapling 9

This is because if the ph is lower than the pKa value it means that the surrounding solution is more acidic than the actual species, therefore it the species will not deprotonate and will remain neutral
Sun Jan 24, 2021 11:28 pm
Forum: Phase Changes & Related Calculations
Topic: weak/strong bases and acids
Replies: 7
Views: 12

### Re: weak/strong bases and acids

In the case of acids, a low pKa or a high Ka is an indicator of a strong acid. Whereas for a base, a low pKb and/or a high Kb is an indicator of a strong base
Sun Jan 24, 2021 11:27 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Ice Tables
Replies: 28
Views: 64

### Re: Ice Tables

It depends on which way the reaction is moving. If it is going in the forward direction, then it would be -x for the reactants and +x for the products. If the reaction is moving in the reverse direction, then it would be -x for the products and +x for the reactants.
Sun Jan 24, 2021 11:25 pm
Forum: Phase Changes & Related Calculations
Topic: Define Phase Change
Replies: 29
Views: 60

### Re: Define Phase Change

Phase change means that a substance has changed from one state of matter to another. An example of this would be liquid water becoming water vapor.
Fri Jan 22, 2021 4:09 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy units
Replies: 7
Views: 24

### Enthalpy units

Are the units of ΔH⊖rxn always just Kj whereas the units of ΔH⊖f always Kj/mol?
Sun Jan 17, 2021 3:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Chart with Gas Pressures
Replies: 8
Views: 24

### Re: ICE Chart with Gas Pressures

Yes we use them in the ice chart like we would with concentrations. You do not need to convert the units.
Sun Jan 17, 2021 3:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: increasing/decreasing a solid/liquid
Replies: 6
Views: 17

### Re: increasing/decreasing a solid/liquid

We do not include liquids nor solids in the equilibrium expression so the amount to solid or liquid won't cause a change in the equilibrium
Sun Jan 17, 2021 3:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: shifts left or right
Replies: 20
Views: 42

### Re: shifts left or right

If the equation is shifting to the left, it means it will produce more reactants. If the equation is shifting to the right, it means it will produce more products
Sun Jan 17, 2021 3:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling HW Q10
Replies: 2
Views: 21

### Re: Sapling HW Q10

Because the overall pH of the solution (9.57) is greater than the pKa, the neutral, deprotonated species of B will become more predominant in solution.
Sun Jan 17, 2021 3:01 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Using the ICE table
Replies: 32
Views: 82

### Re: Using the ICE table

Yes you can use Ice table for both partial pressures and concentrations.
Sun Jan 17, 2021 2:55 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: q vs k
Replies: 62
Views: 163

### Re: q vs k

Yes Q will eventually reach K. And Q is expressed when equilibrium has not yet been reached.
Sun Jan 10, 2021 1:27 pm
Forum: Ideal Gases
Topic: Inert Gas
Replies: 20
Views: 81

### Re: Inert Gas

Inert gases are just noble gases
Sun Jan 10, 2021 1:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating Equilibrium Concentrations
Replies: 10
Views: 40

### Re: Calculating Equilibrium Concentrations

You do not include solids nor solvents because their concentrations do not change by any significant amount.
Sun Jan 10, 2021 1:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: I in ICE Chart
Replies: 11
Views: 37

### Re: I in ICE Chart

Yes if the reverse reaction were being executed then you would have an initial concentration for the products.
Sun Jan 10, 2021 1:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Units
Replies: 27
Views: 92

### Re: Units

Because 1 bar is approximately equal to 1 atm we use both and don't necessarily prefer one over the other. However, I do believe the SI unit is bar
Sun Jan 10, 2021 1:23 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Endothermic and Exothermic Reactions
Replies: 6
Views: 27

### Re: Endothermic and Exothermic Reactions

If you have an endothermic reaction, then you can think of heat as a reactant so if you were to release heat, the reaction would shift to the left whereas if you increase heat, it would favor the products/forward reaction.
Sun Jan 10, 2021 1:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When to use ice table
Replies: 4
Views: 28

### Re: When to use ice table

You typically use ice chart when you know the reactants aren't being used up to completion. Usually you are given the initial conditions and you are trying to find the change in concentrations in order to determine the final equilibrium concentrations.
Fri Dec 11, 2020 6:09 pm
Forum: Lewis Acids & Bases
Topic: Aluminum Chloride naming in today's review
Replies: 4
Views: 37

### Re: Aluminum Chloride naming in today's review

Because this bond is ionic, you do not use prefixes in naming it
Fri Dec 11, 2020 6:07 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Ligands vs Polydentate ligands
Replies: 5
Views: 35

### Re: Chelating Ligands vs Polydentate ligands

Polydentate ligands will form chelate/ring attached to the transition metal.
Fri Dec 11, 2020 5:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 6
Views: 37

### Re: Bond Angles

If there are 4 regions of electron density with 3 of them being bonded pairs and one being lone pair, then the lone pair will create more repulsion, causing the bonded pairs to be pushed down, making their bonds closer together (so less than 109.5)
Fri Dec 11, 2020 5:19 pm
Forum: Polyprotic Acids & Bases
Topic: Textbook 6C.19
Replies: 7
Views: 61

### Re: Textbook 6C.19

HCl is a stronger acid because a strong acid is one that easily loses a proton/hydrogen. Cl has less electronegativity than F so the bond between H and Cl is weaker than that between H and F, making HCl the stronger acid. And for c, HClO2 is stronger because Cl has higher electronegativity than Br s...
Fri Dec 11, 2020 5:15 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Relative Acidity
Replies: 7
Views: 58

### Re: Relative Acidity

First compare bond length. If bonds are the same in the compounds you are comparing then compare stability of the anions (so compare electronegativity)
Fri Dec 11, 2020 5:14 pm
Forum: Hybridization
Topic: hybridization
Replies: 10
Views: 72

### Re: hybridization

It would be sp3 because there are 4 regions of electron density around the N (3 bonds with hydrogens and one lone pair)
Sat Dec 05, 2020 2:12 pm
Forum: Naming
Topic: Textbook Question 9C.1
Replies: 3
Views: 36

### Re: Textbook Question 9C.1

List the ligands in alphabetical order and add the suffix -ate when the complex has a negative charge
Sat Dec 05, 2020 2:09 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Sapling Homework 9 Problem 2
Replies: 10
Views: 112

### Re: Sapling Homework 9 Problem 2

use this list https://sites.google.com/site/chempendix/ligands to determine what type the ligand is.
Sat Dec 05, 2020 2:08 pm
Forum: Ionic & Covalent Bonds
Topic: Polar and Nonpolar
Replies: 28
Views: 176

### Re: Polar and Nonpolar

Check to see if the dipoles cancel it. If they do, then the species is non polar and if they do not cancel out, the species is polar.
Sat Dec 05, 2020 2:07 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Tetrahedral vs Square Planar Coordinate Complex
Replies: 8
Views: 71

### Re: Tetrahedral vs Square Planar Coordinate Complex

For this class, you do not need to distinguish between tetrahedral and square planar. Just know that they are the common shape for coordination number 4.
Sat Dec 05, 2020 2:06 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number
Replies: 13
Views: 80

### Re: coordination number

Coordination number refers to the number of donor atoms from the ligands that are bonded to the central atom. To find this, determine what the ligands' types (mono dentate, bidentate, etc.) and based on this, count the number of atoms that are bonded to the centra atom. In [FeBr4]2 the coordination ...
Sat Dec 05, 2020 2:01 pm
Forum: Naming
Topic: Sapling
Replies: 11
Views: 122

### Sapling

In the compound [Cd(en)Br2], what does the en stand for?
Sat Dec 05, 2020 1:55 pm
Forum: Naming
Topic: Coordination Compound vs complex ion
Replies: 4
Views: 70

### Coordination Compound vs complex ion

What is the difference between a coordination compound and a complex ion? Is a complex ion just a coordination compound with a nonzero net charge.
Sun Nov 29, 2020 11:40 pm
Forum: Resonance Structures
Topic: Resonance Structure Confusion
Replies: 5
Views: 19

### Re: Resonance Structure Confusion

This is because the structures have different atom connectivities.
Sun Nov 29, 2020 11:38 pm
Forum: Significant Figures
Topic: 40. versus 40
Replies: 23
Views: 181

### Re: 40. versus 40

Yes because, without a decimal present, ending zeros are not counted as significant digits
Sun Nov 29, 2020 11:37 pm
Forum: Sigma & Pi Bonds
Topic: Pi and Sigma bonds
Replies: 4
Views: 41

### Re: Pi and Sigma bonds

Sigma bonds are single bonds whereas pi bonds occur in any bonds other than single bonds. Sigma bonds are more flexible whereas pi bonds are more fixed in their positions.
Sun Nov 29, 2020 11:35 pm
Forum: Hybridization
Topic: Sigma and Pi bonds
Replies: 21
Views: 154

### Re: Sigma and Pi bonds

Sigma bonds are more flexible and are single bonds whereas pie bonds are more fixed in their position and occur in double and triple bonds.
Sun Nov 29, 2020 11:33 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 11
Views: 83

### Re: Resonance

This is because different resonance structures may have atoms with higher or lower formal charges. The resonance structure that is most stable is the one with atoms with the lowest magnitude of formal charge.
Sun Nov 29, 2020 11:32 pm
Forum: Hybridization
Topic: Delocalized Pi Bond
Replies: 10
Views: 69

### Re: Delocalized Pi Bond

Delocalized pie bonds occur when pie orbitals extend across more than 2 atoms in a molecule. In terms of lewis structures, you can show this by drawing multiple resonance structures.
Tue Nov 24, 2020 1:51 am
Forum: Lewis Structures
Topic: Octet Rule
Replies: 17
Views: 135

### Re: Octet Rule

Atoms that are in the 3rd row or lower can have more than 8 electrons because they can fill their d states with electrons.
Tue Nov 24, 2020 1:50 am
Forum: Resonance Structures
Topic: Atom Connectivities
Replies: 5
Views: 42

### Re: Atom Connectivities

It means that the atoms are not being moved but rather it is the actual electrons that are delocalized/move to create different resonance structures.
Tue Nov 24, 2020 1:49 am
Forum: Lewis Structures
Topic: Dot stucture
Replies: 11
Views: 66

### Re: Dot stucture

Yes! And once you have found the total number of electrons, try to make each atom achieve an octet. If the central atom is in the 3rd group or lower, however, it can get an extended octet and have more than 8 electrons around it
Tue Nov 24, 2020 1:46 am
Forum: Quantum Numbers and The H-Atom
Topic: Silver Electron Configuration
Replies: 9
Views: 34

### Re: Silver Electron Configuration

This is because the species is more stable if all of the orbitals in the d state are filled with 2 electron so an electron from the 5s state will move to the 4d state
Tue Nov 24, 2020 1:44 am
Forum: Electronegativity
Topic: determining electronegativity
Replies: 31
Views: 253

### Re: determining electronegativity

Electronegativity is essentially an atom's pull on electrons. The trend is that electronegativity increases as you go across a period and decreases as you go down a group
Tue Nov 24, 2020 1:42 am
Forum: Dipole Moments
Topic: Polarity
Replies: 30
Views: 152

### Re: Polarity

If the dipoles of the polar bonds cancel each other out, then the overall species would still be considered non polar.
Tue Nov 24, 2020 1:42 am
Forum: Hybridization
Topic: e density
Replies: 30
Views: 136

### Re: e density

Yes regions of electron density are bonding regions/electrons and lone pairs
Tue Nov 24, 2020 1:40 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Molecular Polarity using VSEPR
Replies: 8
Views: 53

### Re: Determining Molecular Polarity using VSEPR

This is because the dipoles cancel each other out, making the molecular non polar
Tue Nov 24, 2020 1:40 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: isoelectronic
Replies: 12
Views: 82

### Re: isoelectronic

If two species are isoelectronic, it means they have the same number of electrons. However, the two species will still have different properties as their nuclear charges are different.
Tue Nov 24, 2020 1:38 am
Forum: Limiting Reactant Calculations
Topic: Combustion
Replies: 10
Views: 115

### Re: Combustion

In general, it is usually assumed that the O2 is in excess so it would usually not be the limiting reactant.
Sun Nov 15, 2020 11:01 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: Sapling #20
Replies: 2
Views: 10

### Sapling #20

In #20 of the sapling assignment it asks you to choose which intermolecular forces of attraction are present between CH3CHO molecule. I was wondering why hydrogen bonding cannot be present here by connecting the oxygen atom to one of the hydrogen atoms?
Sun Nov 15, 2020 9:55 pm
Forum: Lewis Structures
Topic: Oxidation Number
Replies: 3
Views: 33

### Oxidation Number

How do we use oxidation numbers to identify the most plausible lewis structure?
Sun Nov 15, 2020 9:11 pm
Forum: Lewis Structures
Topic: Bond Lengths
Replies: 1
Views: 26

### Bond Lengths

In the #4 of the sapling assignment, it gives us a table of expected bond lengths and also informs us of the observed bond lengths. It then asks us to chose the correct statement about the lewis structure and bond lengths. In the answer options it says "the carbon–nitrogen bond has ample C=N bo...
Sun Nov 15, 2020 7:27 pm
Forum: Electronegativity
Topic: hydrogen bonds w/ carbon
Replies: 5
Views: 34

### Re: hydrogen bonds w/ carbon

The difference in electronegativity between a carbon atom and a hydrogen atom is not great enough to make an interaction as strong as a hydrogen bond
Sun Nov 15, 2020 7:25 pm
Forum: Bond Lengths & Energies
Topic: Hydrogen Bonds
Replies: 16
Views: 122

### Re: Hydrogen Bonds

No a hydrogen bonding with another hydrogen is not considered hydrogen bonding. This type of interaction is also not favorable since hydrogen would be delta positive so two delta positive atoms would not be attracted to one another.
Sun Nov 15, 2020 7:21 pm
Forum: Octet Exceptions
Topic: Nitrogen
Replies: 4
Views: 43

### Re: Nitrogen

I believe Nitrogen, being that it is only in the 2nd row, does follow the octet rule
Sun Nov 15, 2020 7:20 pm
Forum: Ionic & Covalent Bonds
Topic: midterm 2: knowing compounds
Replies: 14
Views: 76

### Re: midterm 2: knowing compounds

Since we have never been formally taught chemical formulas in this class, I don't think we are expected to know them during the test
Thu Nov 12, 2020 5:58 pm
Forum: Dipole Moments
Topic: London Interactions
Replies: 5
Views: 37

### London Interactions

In Wednesday's lecture, Dr. Lavelle said that London interactions are always present and attractive. What did he mean by present? Like are London dispersion forces also present in compounds with ionic or hydrogen bonds?
Thu Nov 05, 2020 10:27 am
Forum: Resonance Structures
Topic: Resonance Lecture Question
Replies: 10
Views: 75

### Re: Resonance Lecture Question

It represents lone pairs (electrons not involved in the actual bonding/not shared elections)
Thu Nov 05, 2020 10:26 am
Forum: Electronegativity
Topic: Periodic Table Trend
Replies: 37
Views: 387

### Re: Periodic Table Trend

Increases as you go across the table and decreases as you go down
Thu Nov 05, 2020 10:26 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: S and P electrons
Replies: 14
Views: 114

### Re: S and P electrons

Because they are further from the nucleus and the further away an electron is, the more energized it is
Thu Nov 05, 2020 10:23 am
Forum: Trends in The Periodic Table
Topic: Ionic Radius
Replies: 8
Views: 62

### Re: Ionic Radius

The one with a greater nuclear charge (in this case Na+) will be smaller because it has a greater hold pull on the electrons
Thu Nov 05, 2020 10:22 am
Forum: Ionic & Covalent Bonds
Topic: Lengths of Single & Double Bonds
Replies: 4
Views: 44

### Re: Lengths of Single & Double Bonds

I do not think we will have to memorize these values (just remember that single bond is longer than double bond)
Thu Nov 05, 2020 10:21 am
Forum: Lewis Structures
Topic: Lewis structure for formaldehyde
Replies: 4
Views: 42

### Re: Lewis structure for formaldehyde

Hydrogen is in the 1s state and therefore will not follow the octet guideline
Sun Nov 01, 2020 11:23 pm
Forum: Lewis Structures
Topic: Brackets for Anions
Replies: 6
Views: 45

### Re: Brackets for Anions

You use brackets whenever you want to specify the charge of a certain species (which can be both an anion or a cation)
Tue Oct 27, 2020 1:25 pm
Forum: Photoelectric Effect
Topic: Energy of photon
Replies: 5
Views: 57

### Energy of photon

In the equation Ep - (threshold energy) = (kinetic energy)
what are the units of each energy? Is Ep in units of J/photon or J/mol of photon? And if it is in units of J/photon, would you just multiply by Avogadro's number to get it in J/mol of photon?
Tue Oct 27, 2020 1:15 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 3
Views: 41

### Work Function

If the work function is given to us in kJ/mol, do we need to convert it to J/photon (so we would need to multiple the work function by 1000 to go from kJ to J and then divide by Avogadro's number to change from per mol to per photon)?
Mon Oct 26, 2020 5:27 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Equation Textbook Problem
Replies: 1
Views: 37

### Empirical Equation Textbook Problem

A .50-g sample of metallic tin was placed in a 26.45-g crucible and heated until all the tin had reacted with the oxygen in air to form an oxide. The crucible and product together were found to weigh 28.35 g. (a) What is the empirical formula of the oxide? (b) Write the name of the oxide When I was ...
Mon Oct 26, 2020 4:14 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Equations Textbook Problem
Replies: 1
Views: 31

### Balancing Equations Textbook Problem

How would you go about balancing the following equation:
C10H15N + O2 -> CO2 + H2O + CH4N2O

Because the answer had very high coefficients so I was confused as to how to find the balanced equation using a method other than just guess and check
Sun Oct 25, 2020 12:08 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Post Assessment
Replies: 3
Views: 30

### Atomic Spectra Post Assessment

An excited hydrogen atom emits light with a frequency of 1.14x10^14 Hz to reach the energy level n = 4. In what principle quantum level did the electron begin? Can someone please walk me through how to do this problem? Because whenever I get an answer using the rubber equation for n it is never a wh...
Fri Oct 23, 2020 2:06 pm
Forum: Student Social/Study Group
Topic: Midterm Practice
Replies: 5
Views: 49

### Re: Midterm Practice

I would recommend going through the textbook problems that he mentioned in the syllabus for extra practice. Also, I found the modules to be a great review of what Dr. Lavelle went over in the lectures
Fri Oct 23, 2020 2:04 pm
Forum: General Science Questions
Topic: When to use sig figs
Replies: 19
Views: 112

### Re: When to use sig figs

You should only round your numbers to the correct number of sig figs once you have found your final answer
Fri Oct 23, 2020 2:02 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Lyman vs. Balmer Series
Replies: 5
Views: 40

### Re: Lyman vs. Balmer Series

If light is in the visible region (Balmer series), then the transition involves the n = 2 stage. Where as all traditions involving n =1 are with the ultra violet region (Lyman series)
Fri Oct 23, 2020 1:58 pm
Forum: Quantum Numbers and The H-Atom
Topic: Magnetic Quantum Numbers
Replies: 6
Views: 36

### Re: Magnetic Quantum Numbers

m sub l does not only equal l - 1. It can equal a range of values; m sub l equals 1, l-1,... -1. For example. if l equals 2, then m sub l can be equal to 2, 1, 0, -1, -2.
Fri Oct 23, 2020 1:54 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1B.27
Replies: 5
Views: 59

### Re: 1B.27

The speed can be between 0m/s and 10m/s therefore the uncertainty in the speed is 10m/s (not 5)
Fri Oct 23, 2020 1:54 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1B.27
Replies: 5
Views: 59

### Re: 1B.27

The speed can be between 0m/s and 10m/s therefore the uncertainty in the speed is 10m/s (not 5)
Fri Oct 23, 2020 1:52 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Silver Atom
Replies: 3
Views: 39

### Silver Atom

In today's lecture, Dr. Lavelle talks about the silver atom used in the Stern and Garlach Experiment. He says that the silver atom has one unpaired electron in the 5s state. Can someone please explain to me why that is the case (because I would have thought the unpaired electron was in the 4d state).
Fri Oct 16, 2020 3:59 pm
Forum: Photoelectric Effect
Topic: photoelectric experiment post assessment
Replies: 2
Views: 35

### photoelectric experiment post assessment

In photoelectric experiments, typically what part of the electromagnetic spectrum is the incoming light?
Fri Oct 16, 2020 3:58 pm
Forum: Photoelectric Effect
Topic: photoelectric effect
Replies: 17
Views: 131

### photoelectric effect

Is the threshold energy the same thing as the work function?
Fri Oct 16, 2020 3:54 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Hydrogen Spectra
Replies: 2
Views: 30

### Hydrogen Spectra

I know that the Lyman series corresponds to the UV region and the Balmer series is associated with the visible region, but is there a series name that corresponds to the infrared region?
Fri Oct 16, 2020 3:52 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 2
Views: 30

### Rydberg Equation

For the Rydberg equation that is equal to frequency, is there a negative sign in front of the Rydberg constant?
Fri Oct 16, 2020 3:51 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Module Question 39
Replies: 2
Views: 38

### Re: Atomic Spectra Module Question 39

You use the change in n values to find the frequency of the light emitted (using the V = -R((1/n^2)-(1/n^2)) equation). And then once you get the frequency, you use the equation c = (frequency)(wavelength) to solve for the wavelength
Fri Oct 16, 2020 3:48 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra
Replies: 5
Views: 69

### Atomic Spectra

For the equation V = -R((1/n^2)-(1/n^2))
How do we know which n value (the final or initial n value) to put first in the equation?
Tue Oct 06, 2020 1:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Turning in textbook problems
Replies: 10
Views: 118

### Re: Turning in textbook problems

Sorry meant to say sapling (not sampling)
Tue Oct 06, 2020 1:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Turning in textbook problems
Replies: 10
Views: 118

### Turning in textbook problems

I know we are required to turn in the sampling problems through the website but are we required to turn in the textbook problems as well? And, if so, how/where would we turn them in?
Tue Oct 06, 2020 1:42 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Post Mod Q
Replies: 2
Views: 48

### Atomic Spectra Post Mod Q

In 1.0 s, a 60 W bulb emits 11 J of energy in the form of infrared radiation (heat) of wavelength 1850nm. How many photons of infrared radiation does the lamp generate in 1.0s?

How would you go about finding the answer to this question?
Tue Oct 06, 2020 1:41 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Q
Replies: 1
Views: 21

### Atomic Spectra Q

Are we expected to memorize the wavelengths associated with each region of any atom's electromagnetic spectrum? And, if so, which atoms would we need to do this for?
Tue Oct 06, 2020 1:39 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Post Mod Q
Replies: 1
Views: 28

### Atomic Spectra Post Mod Q

The meter was defined in 1963 as 1,650,763.73 wavelengths of radiation emitted by krypton-86 (it has since been redefined). What is the wavelength of this krypton-86 radiation?

How would you solve this problem?
Tue Oct 06, 2020 1:36 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Module Question
Replies: 1
Views: 41

### Atomic Spectra Module Question

If 1 million photons in the UV region are absorbed by a hydrogen gas sample how many electrons are excited to a higher energy level?

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