Search found 86 matches

by 705340227
Sun Feb 21, 2021 1:44 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge [ENDORSED]
Replies: 2
Views: 36

Salt Bridge [ENDORSED]

How does the Na+ and Cl- go through the salt bridge to the other side?
by 705340227
Sun Feb 21, 2021 1:40 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Conducting solid
Replies: 2
Views: 10

Conducting solid

Why do the half reactions need a conducting solid?
by 705340227
Sun Feb 21, 2021 1:37 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell doing work
Replies: 1
Views: 10

Cell doing work

During Friday's lecture, Lavelle said that the cell (battery) must do work so E naught of the cell must be positive. Why do we know that the cell must be doing work?
by 705340227
Sun Feb 21, 2021 1:32 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 6
Views: 20

Salt Bridge

I know that Lavelle went over this during lecture but I am still a little confused. Why do we need a salt bridge for the cell?
by 705340227
Sun Feb 21, 2021 1:23 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Platinum inert conductor
Replies: 3
Views: 9

Platinum inert conductor

Can someone please explain the part where Lavelle said that we should use platinum as an electrode to transfer electrons? Why do we need this?
by 705340227
Sun Feb 14, 2021 2:59 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Temperature and K
Replies: 14
Views: 34

Temperature and K

Can someone review the correlation between temperature and K? Thanks!
by 705340227
Sun Feb 14, 2021 2:57 pm
Forum: Calculating Work of Expansion
Topic: Ideal gas constant
Replies: 9
Views: 28

Ideal gas constant

Can someone please review how to choose which value of R to choose for the ideal gas constant? Thanks!
by 705340227
Sun Feb 14, 2021 2:56 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: Entropy trends from 4H
Replies: 7
Views: 14

Re: Entropy trends from 4H

I believe that larger molecules have more possible positions for all the atoms to be in so therefore they have higher entropy. Less rigid molecules also have more opportunities for lots of possible positions.
by 705340227
Sun Feb 14, 2021 2:53 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Sapling 18
Replies: 3
Views: 24

Sapling 18

I was trying to do number 18 on the sapling homework and I am using their hints and doing everything they say, but I'm still getting it wrong. I was wondering if someone could walk me through it step by step?
by 705340227
Sun Feb 14, 2021 11:47 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy Equations
Replies: 3
Views: 15

Entropy Equations

I was struggling with the sapling homework to determine which equation to use when so I was wondering if someone had compiled a list of entropy equations. Thanks!
by 705340227
Sun Feb 07, 2021 11:56 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Equations
Replies: 1
Views: 29

Equations

I know this is a lot to ask, but I was having a lot of trouble with knowing which equations to use for the week 3 and 4 sapling homework, so I was wondering if someone could write out a list of equations and how to use each one of them. Thanks!
by 705340227
Sun Feb 07, 2021 11:53 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: What equation to use when finding work
Replies: 2
Views: 12

What equation to use when finding work

When do I use w= -P * delta V versus w = -nRTln(Vfinal/Vinitial)?
by 705340227
Sun Feb 07, 2021 11:51 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: ΔU and ΔS describing system change
Replies: 2
Views: 12

Re: ΔU and ΔS describing system change

I know that entropy is a maximum at equilibrium but when U is at zero then it is at equilibrium. Hope this helps a bit.
by 705340227
Sun Feb 07, 2021 11:49 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: calorimeter
Replies: 1
Views: 8

calorimeter

I saw that the way to find the calorimeter constant is by using the formula C = q/ delta T. I was wondering if someone can explain why this equation is what it is. Thanks, I tend to remember equations better if I understand how they were derived!
by 705340227
Sat Feb 06, 2021 2:17 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Sapling question
Replies: 3
Views: 28

Sapling question

Is there a formula or something I should be using to solve question 9 on the Sapling homework that is due Sunday week 5? I'm not sure how to go about doing it.
by 705340227
Sun Jan 31, 2021 11:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: stability of products and reactants
Replies: 2
Views: 11

stability of products and reactants

I know that when K is large then the products are more stable than the reactants and when K is small then the reactants are more stable than the products but I was wondering for which values of K thus actually applies to because like 1 is a 1:1 ratio of products to reactants so would it be defined a...
by 705340227
Sun Jan 31, 2021 11:12 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homework Problem
Replies: 3
Views: 12

Homework Problem

On the week 3/4 homework for #6 the first equation is CH4 + 2O2 yields CO2 + 2H2O and asks to identify a quantity equal to delta H reaction. The answer was the combustion of CH4 but I was wondering why it wouldn’t be the combustion of CH4 and the formation of CO2 and 2H2O.
by 705340227
Sun Jan 31, 2021 11:09 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Textbook question
Replies: 3
Views: 19

Textbook question

There was a textbook question asking why Cl2 is thermodynamically more stable than F2 and I was wondering how I would approach that problem. It was 5I.13 in the textbook.
by 705340227
Sun Jan 31, 2021 11:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pKa and conjugate base
Replies: 4
Views: 20

pKa and conjugate base

On the midterm there was a question about the strength of a conjugate base and the acid’s pKa value. I saw something that said that the larger the pKa of an acid, the stronger its conjugate base, and I was wondering why that is and if someone could explain that. Thanks!
by 705340227
Sun Jan 31, 2021 10:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Telling Apart Weak Bases vs Weak Acids by their Formula
Replies: 10
Views: 32

Re: Telling Apart Weak Bases vs Weak Acids by their Formula

I have been having trouble with this as well. One thing that I do know is if something is negative, it’s most likely going to be a base. If something is positive, it’s most likely going to be an acid. Hope that helps a little!
by 705340227
Sun Jan 24, 2021 1:14 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: When enthalpy is zero
Replies: 4
Views: 23

When enthalpy is zero

Can someone explain why the standard enthalpy of the formation of an element in its most stable state is zero?
by 705340227
Sun Jan 24, 2021 1:11 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 58
Views: 180

Hess's Law

I understand how to use Hess's law but can someone please tell me what the law actually is? Thanks!
by 705340227
Sun Jan 24, 2021 1:07 pm
Forum: Phase Changes & Related Calculations
Topic: Steam
Replies: 32
Views: 135

Re: Steam

The steam burns more than the water because more energy is released from the steam than the water. He went through the math in lecture but the energy released when steam touches your skin is much more than water. This is caused by the phase change from gas to liquid releasing energy as well as the h...
by 705340227
Sun Jan 24, 2021 12:55 pm
Forum: Phase Changes & Related Calculations
Topic: Sapling week 3 #3
Replies: 4
Views: 22

Re: Sapling week 3 #3

I think that it is endothermic because it needs to take in heat in order to have the cold exterior because if it released heat, it would feel hot instead.
by 705340227
Sun Jan 24, 2021 12:52 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5% rule for checking the validity of assumptions
Replies: 10
Views: 61

Re: 5% rule for checking the validity of assumptions

I don't think he mentioned it in lecture but I would assume no just to be safe because they are different units so 10^-5 is different for concentration and partial pressure.
by 705340227
Sun Jan 17, 2021 12:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Lecture Question
Replies: 2
Views: 17

Lecture Question

In lecture, we talked about the reaction: 2H2O yields H3O+ + OH- and Lavelle goes on to say that the reaction is called autoprotolysis which he explains to be the proton transfer between the same type of molecule. Can someone please explain how that relates to that equation?
by 705340227
Sun Jan 17, 2021 12:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Temperature for Concentrations
Replies: 3
Views: 31

Re: Temperature for Concentrations

Also, the exothermic/endothermic properties of the reactions determines how the temperature is going to affect K.
by 705340227
Sun Jan 17, 2021 12:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc and Kp
Replies: 11
Views: 54

Kc and Kp

When do I use Kp versus Kc? I thought that Kc was used when the compounds are aqueous and that Kp is used when they are gases, but in the homework, Kc is used when they are also gases.
by 705340227
Sun Jan 17, 2021 11:59 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: quadratic equations to solve for X
Replies: 7
Views: 44

quadratic equations to solve for X

I noticed sometimes when using a quadratic equation to solve for X you get two values that are both positive. How do you know which one is the correct one?
by 705340227
Sun Jan 17, 2021 11:57 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Week 1 Question 5
Replies: 5
Views: 34

Re: Sapling Week 1 Question 5

You want to use two of the equations that when combined form the original equation. Here, we can use the first equation and the third equation because they contain everything needed to form the original equation. The first equation is: H2 + I2 yields 2HI These values are present in different quantit...
by 705340227
Sun Jan 17, 2021 11:49 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: endothermic/exothermic Q and K
Replies: 16
Views: 94

endothermic/exothermic Q and K

Can someone please explain how the delta H relates to the system being endothermic or exothermic and how this impacts the Q and K when the temperature is raised (similar to the two questions on the sapling homework)?
by 705340227
Sun Jan 10, 2021 8:50 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure and Volume
Replies: 16
Views: 77

Re: Pressure and Volume

When the volume decreases, there is a lot of gas in a very small space, so the pressure of the gas increases. When the volume increases, there is less gas in a large area so the pressure is lowered.
by 705340227
Sun Jan 10, 2021 8:49 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding Helium
Replies: 10
Views: 50

Re: Adding Helium

K does not necessarily change when there is a change in pressure but only a change in volume.
by 705340227
Sun Jan 10, 2021 8:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: How to choose R
Replies: 6
Views: 60

How to choose R

During the discussion we went over how to choose the right R value but I am still confused so can someone please explain how to choose the right value of R? If you could give examples that would be perfect.
by 705340227
Sun Jan 10, 2021 8:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Temperature for Concentrations
Replies: 3
Views: 31

Temperature for Concentrations

Why is the ratio of products to reactants temperature-dependent?
by 705340227
Sun Jan 10, 2021 8:40 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Effects of temperature
Replies: 6
Views: 46

Re: Effects of temperature

Based on what we know, I believe that it is possible for us calculate the specific changes when the temperature changes but I am not sure if that will be asked on the exam or not.
by 705340227
Mon Dec 14, 2020 11:09 pm
Forum: *Shrodinger Equation
Topic: Wave properties of electron diffraction
Replies: 6
Views: 58

Re: Wave properties of electron diffraction

Can someone explain how the wave properties being in phase or out of phase correspond to the electrons in an atom?
by 705340227
Mon Dec 14, 2020 11:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: axial/equatorial
Replies: 5
Views: 59

axial/equatorial

Can someone explain what the axial and equatorial positions mean and how to determine which one a region of electron density is?
by 705340227
Mon Dec 14, 2020 11:02 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid/base rules [ENDORSED]
Replies: 3
Views: 60

Acid/base rules [ENDORSED]

Could someone list rules for determining if a compound is an acid or base? It's hard for me to determine it on a case-by-case basis so I was wondering if there are any generalities for acids and bases.
by 705340227
Mon Dec 14, 2020 10:59 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strength of acid
Replies: 12
Views: 100

Re: Strength of acid

I believe that if the O wasn't present, then you would be right and the radius would be the defining factor in the acidity
by 705340227
Mon Dec 14, 2020 10:57 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Balmer and Lyman Series
Replies: 6
Views: 62

Re: Balmer and Lyman Series

I think normally you could calculate the frequency or wavelength based on what the problem gives you so it probably isn't necessary to memorize them!
by 705340227
Sun Dec 06, 2020 9:36 pm
Forum: Lewis Acids & Bases
Topic: Strong Acids and Strong Bases
Replies: 6
Views: 43

Re: Strong Acids and Strong Bases

In Friday's lecture, Lavelle explained that strong acids lose hydrogen ions easily (so the bond between the hydrogen and the other atom is weaker) and that the resulting anions are more stable for stronger acids.
by 705340227
Sun Dec 06, 2020 9:28 pm
Forum: Photoelectric Effect
Topic: exciting electrons
Replies: 3
Views: 46

exciting electrons

Does our knowledge about how electrons are excited to a higher energy level by a photon of light play into anything we have learned later this quarter?
by 705340227
Sun Dec 06, 2020 9:17 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: HW Question coordination number
Replies: 4
Views: 28

Re: HW Question coordination number

The above comment is correct.
The coordination number corresponds to the number of bonds that the metal has in the coordination compound.
by 705340227
Sun Dec 06, 2020 9:10 pm
Forum: Amphoteric Compounds
Topic: 6A.17 Question
Replies: 3
Views: 35

Re: 6A.17 Question

The amphoteric compounds tend to follow the same line in the periodic table as the metalloids.
by 705340227
Sun Dec 06, 2020 9:08 pm
Forum: Hybridization
Topic: Hybridization Format
Replies: 2
Views: 31

Re: Hybridization Format

You can also have hybrid orbitals with the d orbital once you get into higher shells.
by 705340227
Sun Nov 29, 2020 11:13 am
Forum: Hybridization
Topic: Lecture #23
Replies: 13
Views: 122

Re: Lecture #23

Each carbon has one unhybridized p-orbital, so therefore there are 6 unhybridized p-orbitals throughout the whole molecule. Because this structure exhibits resonance, some of the electrons are delocalized, do the molecules can share these electrons. I believe that the six unhybridized electrons are ...
by 705340227
Sun Nov 29, 2020 11:06 am
Forum: Determining Molecular Shape (VSEPR)
Topic: homework question
Replies: 2
Views: 34

homework question

The homework asks you to draw the structures of H2CCH2, H2CCCH2, and H2CCCCH2. Why would the second two structures not be arranged in a ring/triangle? Also, can someone explain the last part of the question that asks which H molecules are in the same plane?
by 705340227
Sun Nov 29, 2020 10:55 am
Forum: Hybridization
Topic: hybridization orbitals
Replies: 5
Views: 63

hybridization orbitals

How do you choose the right hybridization orbital that an atom in a compound uses?
by 705340227
Sun Nov 29, 2020 10:46 am
Forum: Hybridization
Topic: sp and sp2
Replies: 7
Views: 72

sp and sp2

I know that the sp3 orbital has four hybrid orbitals, but what do the sp and sp2 orbitals look like? Also, why do we need to do sp or sp2 instead of sp3 in some instances?
by 705340227
Sun Nov 29, 2020 10:44 am
Forum: Dipole Moments
Topic: Negative Pole
Replies: 7
Views: 59

Re: Negative Pole

You should also consider if any dipole moments cancel out. For example, if it is a symmetric linear molecule with negative dipoles on both sides of the central atom, the atom as a whole would actually not be polar.
by 705340227
Sun Nov 22, 2020 8:10 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8753
Views: 1489579

Re: Post All Chemistry Jokes Here

Me: Do you want a banana?
You: No.
Me: K.

(bananas have a lot of potassium and the symbol for potassium is K)
by 705340227
Sun Nov 22, 2020 8:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: determining molecular structure
Replies: 4
Views: 29

determining molecular structure

How do people determine molecular structure experimentally?
by 705340227
Sun Nov 22, 2020 7:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: repulsion strength
Replies: 10
Views: 65

repulsion strength

Why do lone pair electrons have a greater repulsion strength than bonded elctrons?
by 705340227
Sun Nov 22, 2020 7:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polarity of trans-dichlorethene
Replies: 4
Views: 26

polarity of trans-dichlorethene

During lecture, Lavelle used trans-dichlorethene as an example of a nonpolar molecule because the two delta negative sides as opposite from each other and therefore the total molecule does not have a charge. Wouldn't there still be a dipole on each chlorine molecule though?
by 705340227
Sun Nov 22, 2020 7:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: atom rotating
Replies: 2
Views: 13

atom rotating

During lecture, Lavelle talked about what bonds allow an atom to rotate and which do not allow an atom to rotate and I was wondering in what circumstance would an atom need to rotate?
by 705340227
Mon Nov 16, 2020 1:52 pm
Forum: Dipole Moments
Topic: london dispersion forces
Replies: 5
Views: 46

london dispersion forces

How do you determine which molecules only experience london dispeserion forces? There was a question on the homework about this and I couldn't figure out how to tell.
by 705340227
Mon Nov 16, 2020 1:45 pm
Forum: Ionic & Covalent Bonds
Topic: hydrogen bonds
Replies: 4
Views: 45

hydrogen bonds

Which elements are allowed to form hydrogen bonds?
by 705340227
Mon Nov 16, 2020 1:44 pm
Forum: Formal Charge and Oxidation Numbers
Topic: How to find oxidation number
Replies: 3
Views: 43

How to find oxidation number

How do you find the oxidation number when it does not follow the standard rules like how oxygen tends to be -2? Also, how do you know if the oxidation number is negative or positive?
by 705340227
Mon Nov 16, 2020 1:42 pm
Forum: Lewis Structures
Topic: OF2
Replies: 2
Views: 18

OF2

Can someone explain why OF2 is a Lewis base?
by 705340227
Mon Nov 16, 2020 1:41 pm
Forum: Lewis Structures
Topic: polar double bonds in lewis acids and bases
Replies: 1
Views: 19

polar double bonds in lewis acids and bases

On the homework, it says that molecules with polar double bonds can accept electrons and therefore they are acids. Can someone explain why this is?
by 705340227
Sun Nov 08, 2020 9:37 pm
Forum: Lewis Structures
Topic: nitrate lewis structure
Replies: 7
Views: 64

nitrate lewis structure

Why couldn't nitrate have two double bonds with oxygen molecules and one single bond with the last oxygen molecule that would have a -1 charge? I believe that all the electron totals still work and all of the atoms have an octet.
by 705340227
Sun Nov 08, 2020 7:59 pm
Forum: Lewis Structures
Topic: structure of (CO3)2-
Replies: 4
Views: 25

structure of (CO3)2-

How would you know that carbon has one double bond with oxygen and two single bonds with oxygen?
by 705340227
Sun Nov 08, 2020 7:39 pm
Forum: Electronegativity
Topic: determining electronegativity
Replies: 31
Views: 261

Re: determining electronegativity

You can also look at how atoms' electrons behave in chemical bonds to determine the comparative electronegativity of the elements in the compound.
by 705340227
Sun Nov 08, 2020 7:35 pm
Forum: Quantum Numbers and The H-Atom
Topic: Pauli Exclusion Principle and Hund's Rule
Replies: 4
Views: 16

Re: Pauli Exclusion Principle and Hund's Rule

I also had this question, thanks for the explanation!
by 705340227
Sun Nov 08, 2020 7:12 pm
Forum: Coordinate Covalent Bonds
Topic: Group 13 Elements
Replies: 4
Views: 46

Re: Group 13 Elements

Some more examples of Lewis acids include the proton (H+) and acidic compounds onium ions, such as NH4+ and H3O+, high oxidation state transition metal cations like Fe3+, other metal cations, such as Li+ and Mg2+, among others.
by 705340227
Sun Nov 01, 2020 5:58 pm
Forum: Quantum Numbers and The H-Atom
Topic: Ionization energy
Replies: 2
Views: 31

Re: Ionization energy

There is some electron-electron repulsion between the spin up and spin down electrons. Nitrogen does not have any spin up/down pairs in its outermost shell but oxygen does. This causes some electron-electron repulsion in oxygen so it is easier to remove an electron in oxygen than nitrogen. Ionizatio...
by 705340227
Sun Nov 01, 2020 5:53 pm
Forum: Ionic & Covalent Bonds
Topic: Electron spin in bonds
Replies: 8
Views: 76

Re: Electron spin in bonds

I don't think electrons are bound to one state or orbital and their characteristics can change to fit different quantum numbers so those two atoms would still be able to bond.
by 705340227
Sun Nov 01, 2020 5:52 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Radius
Replies: 8
Views: 49

Re: Radius

You can look at the number of protons. If there are more protons, the higher positive charge pulls the electrons in and makes the radius smaller.
by 705340227
Sun Nov 01, 2020 3:39 pm
Forum: Trends in The Periodic Table
Topic: ionic radius
Replies: 14
Views: 69

ionic radius

Do cations, anions, or the regular atom have the largest atomic radius?
by 705340227
Sun Nov 01, 2020 3:38 pm
Forum: Lewis Structures
Topic: ionization energy
Replies: 3
Views: 60

ionization energy

How do we know which atom has the lowest ionization energy when we make lewis structures?
by 705340227
Sun Oct 25, 2020 4:28 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Diffraction
Replies: 4
Views: 30

Diffraction

Does diffraction result from a wave trying to go past a barrier with holes or does it result from waves interacting with each other, or both?
by 705340227
Sun Oct 25, 2020 4:25 pm
Forum: DeBroglie Equation
Topic: n1 and n2
Replies: 15
Views: 56

n1 and n2

In the equation v=R[1/n1^2-1/n2^2], is n1 or n2 the shell that the electron originally starts at before it moves down the shells?
by 705340227
Sun Oct 25, 2020 4:04 pm
Forum: Properties of Light
Topic: Light spectrum
Replies: 8
Views: 59

Light spectrum

Are we supposed to memorize which wavelengths and frequencies correspond to which types of light on the electromagnetic spectrum? If so, are we also supposed to memorize the wavelengths/frequencies of light in the visible spectrum?
by 705340227
Sun Oct 25, 2020 4:01 pm
Forum: General Science Questions
Topic: Lyman vs. Balmer Series
Replies: 5
Views: 52

Re: Lyman vs. Balmer Series

I just remember that the Balmer series is visible light and the lyman series is UV light.
by 705340227
Sun Oct 25, 2020 4:00 pm
Forum: Photoelectric Effect
Topic: Conceptual understanding of the photoelectric experiment
Replies: 5
Views: 57

Re: Conceptual understanding of the photoelectric experiment

I think we should know things similar to the module questions on the photoelectric effect.
by 705340227
Sun Oct 18, 2020 8:45 pm
Forum: Properties of Light
Topic: Wave properties of light
Replies: 4
Views: 69

Wave properties of light

Are there any properties of light that show it acts as a wave? If so, what are these properties?
by 705340227
Sun Oct 18, 2020 8:44 pm
Forum: Properties of Light
Topic: Light as a wave
Replies: 3
Views: 58

Light as a wave

Why is it that if light had wave properties that increasing intensity should remove electrons regardless of its wavelength?
by 705340227
Sun Oct 18, 2020 8:17 pm
Forum: Properties of Light
Topic: Remembering EM spectrum
Replies: 6
Views: 62

Remembering EM spectrum

Do we have to remember the order and which types of light have smaller and bigger wavelengths for the EM spectrum? If so, what are some easy ways to remember the order?
by 705340227
Sun Oct 18, 2020 3:01 pm
Forum: Photoelectric Effect
Topic: Short/high wavelength
Replies: 7
Views: 57

Short/high wavelength

What is the actual reason for the fact that shorter wavelength/higher frequency light can eject electrons but longer wavelength/lower frequency light cannot?
by 705340227
Sun Oct 18, 2020 12:43 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr frequency condition
Replies: 5
Views: 60

Bohr frequency condition

I know the formula for the Bohr frequency condition, but could someone explain what the condition actually is?
by 705340227
Sun Oct 11, 2020 12:03 pm
Forum: Empirical & Molecular Formulas
Topic: order of formulas [ENDORSED]
Replies: 5
Views: 143

order of formulas [ENDORSED]

If we are given which elements are in a molecule, how do we know what order to put them in for the empirical and molecular formulas?
by 705340227
Sun Oct 11, 2020 12:00 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Sapling week 1 hw problem 9
Replies: 4
Views: 59

Sapling week 1 hw problem 9

For problem number 9, I know you subtract the grams of carbon and hydrogen from the original number of grams of the reactant to find the number of grams of oxygen, but I don't understand why we are able to do this and was wondering if someone could explain that.
by 705340227
Sun Oct 11, 2020 11:56 am
Forum: Significant Figures
Topic: Decimal Places in Work.
Replies: 4
Views: 38

Re: Decimal Places in Work.

I think that it's best not to round when doing work, but going to the hundredths place will still give you a pretty accurate solution, especially because you typically end up rounding your final number to align with the number of sig figs anyway.
by 705340227
Sun Oct 11, 2020 11:48 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Mass and precision/interpretation
Replies: 5
Views: 57

Re: Molar Mass and precision/interpretation

I think that experimentally molar mass differs because of experimental errors so that notation is used to show that the possible molar masses differ experiment to experiment. My guess is that that notation will be present in the future.
by 705340227
Sun Oct 11, 2020 11:43 am
Forum: Significant Figures
Topic: Sig Figs
Replies: 4
Views: 36

Re: Sig Figs

Hey! When doing sig figs, you have to follow a set of rules to determine how many sigs figs a number has. For a number such as 43, there are two sig figs. 122 has three and 9 has one. When a number without a decimal has zeroes after it, you do not count the zeroes as part of the number of sig figs. ...

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