## Search found 96 matches

Fri Mar 12, 2021 11:58 pm
Forum: Second Order Reactions
Topic: Termolecular
Replies: 28
Views: 595

### Re: Termolecular

Third order reactions
Fri Mar 12, 2021 11:56 pm
Forum: Balancing Redox Reactions
Topic: Oxidation Numbers: Provided or memorize?
Replies: 20
Views: 68

### Re: Oxidation Numbers: Provided or memorize?

Use the general rules for O and H as well as the charges shown and we should be fine
Fri Mar 12, 2021 11:54 pm
Forum: Zero Order Reactions
Topic: Half life
Replies: 18
Views: 169

### Re: Half life

Use t(1/2) = [A]0/2k
Fri Mar 12, 2021 11:54 pm
Forum: Zero Order Reactions
Topic: zero order
Replies: 30
Views: 85

### Re: zero order

Independent of concentrations of the reactants
Fri Mar 12, 2021 11:53 pm
Forum: General Rate Laws
Topic: Order of a reaction
Replies: 10
Views: 56

### Re: Order of a reaction

Based on experiments and previous data
Sun Mar 07, 2021 9:30 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Which R value to choose
Replies: 13
Views: 75

### Re: Which R value to choose

I try my best to keep track of the units im given and then match them to the R constant accordingly so the calculation produces the units I want.
Sun Mar 07, 2021 9:28 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Bomb calorimeter
Replies: 9
Views: 62

### Re: Bomb calorimeter

Constant pressure (regular calorimeter) vs constant volume (bomb calorimeter)
Sun Mar 07, 2021 9:27 pm
Forum: Van't Hoff Equation
Topic: Test
Replies: 10
Views: 138

### Re: Test

Outline
Sun Mar 07, 2021 9:25 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Non-spontaneous exothermic reaction
Replies: 14
Views: 70

### Re: Non-spontaneous exothermic reaction

Exothermic reactions only tell the delta H. If the delta S is negative and the temperature value high enough, the delta G can be positive.
Sun Mar 07, 2021 9:23 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Cp and Cv
Replies: 5
Views: 41

### Re: Cp and Cv

I use the equations given on the equation sheet (:
Sun Feb 28, 2021 8:47 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff equation
Replies: 10
Views: 91

### Re: Van't Hoff equation

Typically use Van't Hoff when given two temperatures/two K values
Sun Feb 28, 2021 8:46 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: G° vs G
Replies: 29
Views: 141

### Re: G° vs G

G knot is under standard conditions
Sun Feb 28, 2021 8:45 pm
Forum: Calculating Work of Expansion
Topic: Work sign
Replies: 46
Views: 171

### Re: Work sign

If the system itself is doing work, then it is negative. If work is being done onto the system, then it should be positive.
Sun Feb 28, 2021 8:44 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Different Gas Constants
Replies: 9
Views: 72

### Re: Different Gas Constants

I try my best to match the units and typically end up using 0.8314 unless atm is present in the problem then I use 0.08206
Sun Feb 28, 2021 8:43 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: entropy positive value
Replies: 30
Views: 117

### Re: entropy positive value

I think for the universe or for most spontaneous reactions.
Sat Feb 20, 2021 11:14 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Comparing Molar Entropies of Different Compounds
Replies: 9
Views: 77

### Re: Comparing Molar Entropies of Different Compounds

Yes, take into account the phase (gas>liquid>solid) and the size/complexity of the particle. The larger/more complex, the greater the standard molar entropy.
Sat Feb 20, 2021 11:09 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Finding T
Replies: 12
Views: 51

### Re: Finding T

Thanks! Regarding what you said about the spontaneity, which signs of enthalpy and entropy make a reaction spontaneous or not spontaneous? There is no definite answer for the values of delta H and delta S to make the process spontaneous because for that to occur, delta G would have to be negative. ...
Sat Feb 20, 2021 11:07 pm
Forum: Van't Hoff Equation
Topic: Application of Van't Hoff Equation
Replies: 11
Views: 87

### Re: Application of Van't Hoff Equation

In this equation, you have inputs for delta H, K1, T1, K2, and T2. So depending on what you are missing or given, you are able to calculate the other values.
Sat Feb 20, 2021 11:05 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: degeneracy and entropy
Replies: 5
Views: 26

### Re: degeneracy and entropy

Kb is a constant (:
Sat Feb 20, 2021 11:04 pm
Forum: Calculating Work of Expansion
Topic: Value of Q
Replies: 20
Views: 73

### Re: Value of Q

Q is the ratio of concentrations of the products over the reactants with respect to their stoichiometric coefficients.
Sun Feb 14, 2021 11:10 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Combustion = Exothermic
Replies: 23
Views: 122

### Re: Combustion = Exothermic

While heat is required to break the bonds initially, the bonds formed release more energy than that initial amount of inputted energy, resulting in a net release of energy.
Sun Feb 14, 2021 11:08 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Free Energy
Replies: 44
Views: 183

### Re: Free Energy

State functions only depend on the beginning (initial state) and the last (final) state, regardless of what happens in between.
Sun Feb 14, 2021 11:07 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Entropy
Replies: 27
Views: 90

### Re: Entropy

I interpret it as the measure of chaos and progressive disorder.
Sun Feb 14, 2021 11:06 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Closed vs Isolated System
Replies: 28
Views: 67

### Re: Closed vs Isolated System

Closed systems can have exchanges from it and the environment while isolated systems cannot.
Sun Feb 14, 2021 11:05 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Temperature and K
Replies: 14
Views: 63

### Re: Temperature and K

Temperature affects K differently based on if the reaction is endothermic or exothermic.
Sun Feb 07, 2021 6:41 pm
Forum: Phase Changes & Related Calculations
Topic: when to assume x is insignificant
Replies: 83
Views: 262

### Re: when to assume x is insignificant

When K is below 10^-4
Sun Feb 07, 2021 6:40 pm
Forum: Phase Changes & Related Calculations
Topic: Vapor vs gas
Replies: 107
Views: 361

### Re: Vapor vs gas

I think they can be used interchangeably.
Sun Feb 07, 2021 6:38 pm
Forum: Phase Changes & Related Calculations
Topic: Define Phase Change
Replies: 76
Views: 295

### Re: Define Phase Change

A change in state of matter is how I think about it. So changes between solids, liquids, and gases.
Sun Feb 07, 2021 6:37 pm
Forum: Phase Changes & Related Calculations
Topic: Boiling water
Replies: 25
Views: 153

### Re: Boiling water

Hydrogen bonds between h2o molecules are bring broken. Hydrogen bonds are among the strongest intermolecular forces which is why it takes so much heat/energy to break.
Sun Feb 07, 2021 6:35 pm
Forum: Phase Changes & Related Calculations
Topic: Water's Heating Curve
Replies: 9
Views: 44

### Re: Water's Heating Curve

Wait so on the flats, both phases of water exist at the same time?
Sun Jan 31, 2021 9:51 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Definition of an Inert Gas
Replies: 15
Views: 99

### Re: Definition of an Inert Gas

Inert Gases are the gases on the very right side of the periodic table. They are called inert gases because their atomic structure makes it so that they are in a very stable state, rendering them highly UNreactive. Thus, putting them into a container with other gases involved in a reaction is done f...
Sun Jan 31, 2021 9:47 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Diatomic molecules standard enthalpy of formation
Replies: 22
Views: 115

### Re: Diatomic molecules standard enthalpy of formation

I think they should all be zero because that is their standard state i.e. how they naturally exist in the world.
Sun Jan 31, 2021 9:45 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: steam causing burns
Replies: 40
Views: 221

### Re: steam causing burns

Yep! When steam (which is already at a higher temperature than water), makes contact with your skin and reverts back to water, it will release the energy as it drops in temperature as well as the energy from Hvap as it changed phases. That sum of energy is a lot more than simply the change in temper...
Sun Jan 31, 2021 9:43 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Effect of Kelvin Instead of Celsius
Replies: 12
Views: 92

### Re: Effect of Kelvin Instead of Celsius

Because the calculations involve delta T, I don't think you have to convert the temperature units as Kelvin and Celsius have the same increments between each unit of measure.
Sun Jan 31, 2021 9:38 am
Forum: Phase Changes & Related Calculations
Topic: Define Phase Change
Replies: 76
Views: 295

### Re: Define Phase Change

Essentially a change in the state of matter
Solid to Liquid to gas and backwards
Sun Jan 24, 2021 3:37 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Strength of Bonds
Replies: 7
Views: 59

### Re: Strength of Bonds

You can use the strength of bonds and bond energies to determine if a reaction is endothermic or exothermic by comparing the sum of the bond energies on the reactants side and that of the products side and then comparing the two. If the reactants have a higher total bond energy or have stronger bond...
Sun Jan 24, 2021 3:31 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Diatomic Molecules
Replies: 6
Views: 58

### Re: Diatomic Molecules

I think diatomic molecules are just molecules that involve two atoms in total while the diatomic elements allude to the elements that pretty much only exist in a homogenous diatomic arrangement such as O2 and H2.
Sun Jan 24, 2021 3:29 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat released/ gained
Replies: 22
Views: 235

### Re: Heat released/ gained

Bonded atoms are stable so it requires energy to break these bonds and move them into a less stable state. Atoms forming bonds go into a more stable state, therefore releasing energy.
Sun Jan 24, 2021 3:26 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: specific vs molar
Replies: 4
Views: 459

### Re: specific vs molar

Molar heat capacity alludes to the amount of energy required to change the temperature of one mole of the substance while specific heat alludes to the same concept but for one gram of the substance.
Sun Jan 24, 2021 3:24 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Kinetic energy and particle motion
Replies: 4
Views: 33

### Re: Kinetic energy and particle motion

Temperature is commonly defined as the average kinetic energy of the molecules. This derives from the increase of heat and temperature as the observed molecules move fast and increase their speed.
Sun Jan 17, 2021 3:41 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw constant
Replies: 25
Views: 66

### Re: Kw constant

H2O is in excess amounts on both sides of the equation and can therefore be neglected as its minimal changes would not have any considerable effects
Sun Jan 17, 2021 3:39 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE table and Molarity units
Replies: 18
Views: 77

### Re: ICE table and Molarity units

As said above, I think using molarity (mol/L) is the most convenient that volume is already taken care of. However, it can be used with moles and other units of pressure as long as the units throughout the table are consistent.
Sun Jan 17, 2021 3:37 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When x is negligible in Equilibrium constant
Replies: 34
Views: 199

### Re: When x is negligible in Equilibrium constant

According to Lavelle, the safest would be below 10^-4
Sun Jan 17, 2021 3:35 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling HW #2
Replies: 6
Views: 55

### Re: Sapling HW #2

Yep, just use the ice box and the molar ratios for the "change" column. Then use the equilibrium value given to solve for those x's and then plug them back in to get the actual mole values at equilibrium. Then divide by the volume to get M, and then plug it in to the eq. expression.
Sun Jan 17, 2021 3:32 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: hw question #3
Replies: 10
Views: 103

### Re: hw question #3

On the right side of the equation, both the numerator and the denominator have a square (once you combine the like terms in the denominator), meaning the entire fraction can be squared. That way, you can square root both sides of the equation and solve with algebra from there.
Sun Jan 10, 2021 10:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: How to choose R
Replies: 6
Views: 65

### Re: How to choose R

Make sure the units for pressure and volume match(:
Sun Jan 10, 2021 10:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solids and Concentration
Replies: 8
Views: 85

### Re: Solids and Concentration

Their volume does not change and they do not dissolve in solution
Sun Jan 10, 2021 10:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: change in K
Replies: 22
Views: 125

### Re: change in K

Yep just temp in K
Sun Jan 10, 2021 10:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs. Q
Replies: 53
Views: 252

### Re: K vs. Q

Yep, Q is just the expression anytime during the expression wheres as K is the value for when it is in equilibrium.
Sun Jan 10, 2021 10:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Units
Replies: 27
Views: 131

### Re: Units

bars and atm, so make sure you have the right constant (:
Sun Dec 06, 2020 10:27 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Polarity
Replies: 14
Views: 143

### Re: Polarity

You can't know simply from that. You would need the other bonded atoms as well as the shape of the molecule in order to see if the dipole moments remain or cancel out.
Sun Dec 06, 2020 10:26 pm
Forum: Hybridization
Topic: Unhybridized orbitals
Replies: 3
Views: 48

### Re: Unhybridized orbitals

Carbon has 4 valence electrons that can form bonds. In CO2, there are 2 regions of electron density in which the sp hybrid orbitals participate. There are still two more electrons, therefore there are two non hybridized orbitals.
Sun Dec 06, 2020 10:20 pm
Forum: Hybridization
Topic: Unhybridized orbitals
Replies: 5
Views: 74

### Re: Unhybridized orbitals

I think you would look at the number of regions of electron density vs the number of valence electrons available to that atom. For example, a carbon that has three regions of electron density would have 3 sp3 hybridized orbitals and 1 sp that isn't. Carbon has 4 valence electrons.
Sun Dec 06, 2020 10:18 pm
Forum: Hybridization
Topic: Pi Bonds Cannot Rotate
Replies: 23
Views: 249

### Re: Pi Bonds Cannot Rotate

In a pi bond orbitals are overlapping outside of the intermolecular axis. Thus, rotating the bond about that axis would break the pi bond. On the other hand, sigma bonds overlap along this axis and thus allowing rotation.
Sun Dec 06, 2020 10:16 pm
Forum: Hybridization
Topic: pi bonds
Replies: 6
Views: 114

### Re: pi bonds

Anything that is additional to the single bond would be the pi bond, so you would have to look at the lewis structure.
Sun Nov 29, 2020 11:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Remembering Bond Degrees
Replies: 7
Views: 116

### Re: Remembering Bond Degrees

I cement the visualization of the shape and then the associated bond angles using flashcards and I'd say it helped a lot
Sun Nov 29, 2020 11:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: H2O VSEPR
Replies: 27
Views: 165

### Re: H2O VSEPR

2 lone pairs and 2 bonding domains on the central atom in O for H2O forms a "bent" shape
Sun Nov 29, 2020 11:45 pm
Forum: Bond Lengths & Energies
Topic: Hydrogen Bonds
Replies: 16
Views: 195

### Re: Hydrogen Bonds

Nope because hydrogen bonding denotes an intermolecular force
Sun Nov 29, 2020 11:43 pm
Forum: Octet Exceptions
Topic: Phosphate
Replies: 7
Views: 86

### Re: Phosphate

Sun Nov 29, 2020 11:42 pm
Forum: Octet Exceptions
Replies: 7
Views: 100

yep it seems like it, probably synonymous as long as the specie has one unpaired electron making it unstable and existing only for a short amount of time
Sun Nov 22, 2020 11:40 pm
Forum: Dipole Moments
Topic: Dipole-dipole and london-dispersion IMF
Replies: 7
Views: 66

### Re: Dipole-dipole and london-dispersion IMF

Dipole-dipole interactions occur between the partial positive and partial negative ends of two polar molecules. London-Dispersion Forces occur as a result of temporary and arbitrary electron position within its density, which means it occurs in all molecules.
Sun Nov 22, 2020 11:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair E-
Replies: 47
Views: 367

### Re: Lone Pair E-

Yep, thus affecting the shape of the molecule. Their repulsion is stronger than bonding pairs.
Sun Nov 22, 2020 11:22 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Non-Polar Bonds
Replies: 3
Views: 52

### Re: Non-Polar Bonds

Keep in mind that though some molecules have polar bonds, these molecules can be non polar still based on their shape.
Sun Nov 22, 2020 11:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 25
Views: 199

### Re: Bond Angles

I think it would be safe to know the bond angles with the common shapes and geomteries.
Sun Nov 22, 2020 11:09 pm
Forum: Coordinate Covalent Bonds
Topic: Just to clear it up
Replies: 13
Views: 284

### Re: Just to clear it up

Yep because Lewis Bases are defined to donate electrons.
Sun Nov 15, 2020 4:55 am
Forum: Resonance Structures
Topic: lewis base or acid
Replies: 15
Views: 132

### Re: lewis base or acid

Izamary Marquez 2L wrote:Would this make cations and anions more likely to be acids or donors? Is there a correlation?

Cations donate electrons, resulting in their positive charge, making them Lewis bases. Anions accept electrons and then become negatively charged, making them Lewis acids.
Sun Nov 15, 2020 4:52 am
Forum: Bond Lengths & Energies
Topic: Covalent Bond Length
Replies: 13
Views: 208

### Re: Covalent Bond Length

Electronegativity, atomic radius, and either being a single, double, triple bond contributes to bond length.
Sun Nov 15, 2020 4:51 am
Forum: Octet Exceptions
Replies: 24
Views: 244

Having a single unpaired electron would form a radical.
Sun Nov 15, 2020 4:45 am
Forum: Resonance Structures
Topic: Resonance
Replies: 19
Views: 135

### Re: Resonance

Resonance structures are just different Lewis structures of the same molecule. The most stable resonance structures would have the least number of atoms with a formal charge and most especially a sum closest to 0 for formal charges of the whole molecule.
Sun Nov 15, 2020 4:43 am
Forum: Coordinate Covalent Bonds
Topic: When do we use it
Replies: 9
Views: 64

### Re: When do we use it

When only one of the atoms in a covalent bond donates both electrons that are shared, that bond is considered a coordinate covalent bond.
Sun Nov 08, 2020 11:31 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Equation
Replies: 16
Views: 97

### Re: Formal Charge Equation

L is the number of unpaired electrons. In other words, count the number of electrons around an atom that is not participating in a bond.
Sun Nov 08, 2020 11:30 pm
Forum: Resonance Structures
Topic: Valence Electrons [ENDORSED]
Replies: 43
Views: 440

### Re: Valence Electrons[ENDORSED]

Based on the group that the element falls under on the periodic table, you can determine the number of valance electrons. On the S block, Group 1 (alkali metals) have 1 valence electron and Group 2 (alkali earth metals) have 2 valence electrons. Skipping all the way to the p block, the Boron group h...
Sun Nov 08, 2020 11:24 pm
Forum: Lewis Structures
Topic: central atom
Replies: 2
Views: 21

### Re: central atom

Keep track of the number of valence electrons it has by looking at what group it is under in the periodic table. The number of bonds can surpass that however if that central element is passed period 3 because these elements can use their 3d state to accommodate extra valence electrons past 8.
Sun Nov 08, 2020 11:22 pm
Forum: Ionic & Covalent Bonds
Topic: formal charge
Replies: 8
Views: 41

### Re: formal charge

The formal charge of an atom in a molecule will tells you the charge associated with it. We use them to determine the best Lewis Structure for a molecule that has different possibilities. We want the lowest energy, and separating charges takes energy, therefore we want FC's of 0 ideally.
Sun Nov 08, 2020 11:20 pm
Forum: Ionic & Covalent Bonds
Topic: Octet rule exceptions
Replies: 15
Views: 78

### Re: Octet rule exceptions

These atoms do not have up to 8 protons and therefore do not have enough to fullfill 8 valence electrons in its outer shell.
Sun Nov 01, 2020 5:03 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Where should the Rydberg Equation be used?
Replies: 11
Views: 93

### Re: Where should the Rydberg Equation be used?

I think you can choose either. In the lecture, he clearly showed that using the empirical formula twice and then subtracting worked just as well as using the ryderberg equation but it helps teach the concepts. Just be careful with the Ryderberg constant
Sun Nov 01, 2020 4:59 pm
Forum: Trends in The Periodic Table
Replies: 14
Views: 73

Cations would be smaller than their normal atoms because there are more protons than there are electrons, reducing electron repulsion as well allowing the protons to pull tighter on the lesser number of electrons, making that ionic radius smaller.
Sun Nov 01, 2020 4:57 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity vs Electronegativity
Replies: 7
Views: 63

### Re: Electron Affinity vs Electronegativity

While they can be used to imply one another, they directly mean two different things. One has to do with energy changes once electrons are accepted while the other deals with the ability of an atom to attract other atoms.
Sun Nov 01, 2020 4:54 pm
Forum: Trends in The Periodic Table
Replies: 30
Views: 631

The decrease of atomic radius as you travel across the periodic table horizontally is a result of increasing number of protons, pulling the electrons closer without the electrons jumping further away as they would down a group.
Sun Nov 01, 2020 4:50 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Ground State vs. Excited State Question
Replies: 8
Views: 90

### Re: Ground State vs. Excited State Question

This post really helped me a lot! The way I tend to look at it is as if an electron isn't where it's supposed to be because in the configuration, it appears as if an energy level has been skipped, which is kind of what the electron does during its excited state.
Sun Nov 01, 2020 4:48 pm
Forum: Einstein Equation
Topic: E=hv vs E=hf
Replies: 15
Views: 139

### Re: E=hv vs E=hf

I think the distinction is based mostly on context.
Sun Nov 01, 2020 4:47 pm
Forum: Properties of Light
Topic: rydberg's constant
Replies: 11
Views: 115

### Re: rydberg's constant

It depends on which equation you plug it into because like they said, same value but different units and the relation is based on the light energy equaiton.
Sun Nov 01, 2020 4:40 pm
Forum: Photoelectric Effect
Topic: Lyman Series
Replies: 30
Views: 264

### Re: Lyman Series

Yes, but for future references, keep in mind that this is for Hydrogen atom only.
Sun Nov 01, 2020 4:39 pm
Forum: DeBroglie Equation
Topic: Sapling HW Question 25
Replies: 8
Views: 88

### Re: Sapling HW Question 25

You can find the velocity based because you know the wavelength and mass values. So, isolate v in wavelength = h/mv and plug it into 1/2 mv^2.
Sun Nov 01, 2020 11:21 am
Forum: Properties of Light
Topic: Is c always the speed of light?
Replies: 88
Views: 549

### Re: Is c always the speed of light?

Yep, and it will always equal wavelength * frequency when taken from the EM spectrum
Thu Oct 15, 2020 8:56 am
Forum: Einstein Equation
Topic: e=hv used for particles?
Replies: 9
Views: 239

### Re: e=hv used for particles?

My understanding is that it is only applicable to photon energy for electromagnetic waves.
Thu Oct 15, 2020 8:54 am
Forum: Properties of Electrons
Topic: protons and electrons
Replies: 33
Views: 229

### Re: protons and electrons

Protons and neutrons have very similar mass. In fact, their masses together form the atomic mass of that element. Electrons however are so much smaller than them that the mass of electrons is neglected when dealing with atomic mass.
Thu Oct 15, 2020 8:53 am
Forum: Properties of Electrons
Topic: Kinetic energy of electrons
Replies: 3
Views: 50

### Re: Kinetic energy of electrons

Yep reference sheets for constants are useful! I imagine that our assessments in the future, we will be provided with these needed constants along with our periodic table.
Thu Oct 15, 2020 8:48 am
Forum: Properties of Light
Topic: Calculator number meaning
Replies: 6
Views: 105

### Re: Calculator number meaning

Like the previous replies said, e is used to mean "10 to the power of." You can even input your own "E" by pressing "2nd" and then "," (comma) on the TI-84 if you have one. This makes it a lot easier to input very low/high values without *10^x and adding all t...
Thu Oct 15, 2020 8:34 am
Forum: Properties of Light
Topic: Photoelectric spectrum
Replies: 24
Views: 221

### Re: Photoelectric spectrum

I think that it's safe to assume that we would be given an image or reference of the spectrum. But, I think it would probably be really helpful to be familiar with some of the ranges such as that of visible light.
Thu Oct 08, 2020 8:57 pm
Forum: SI Units, Unit Conversions
Topic: Textbook
Replies: 2
Views: 43

### Re: Textbook

I'm in the same situation, and yes you can access the textbook. It should be on the right-hand side when you open Sapling as an ebook. I had to make an account to use the textbook. Omg how did I not see the giant textbook on the right hand side of the screen I'm so blind HAHA. Thank you so much thi...
Thu Oct 08, 2020 8:32 pm
Forum: SI Units, Unit Conversions
Topic: #10 in the sapling
Replies: 6
Views: 93

### Re: #10 in the sapling

I just googled the molar masses of the molecules ahaha. I feel like in the future we would be given the molar masses of molecules that we aren't familiar with such as this.
Thu Oct 08, 2020 8:08 pm
Forum: SI Units, Unit Conversions
Topic: Textbook
Replies: 2
Views: 43

### Textbook

My textbook has yet to arrive along with my sapling code. However, I do have the free trial for sapling. Is it possible to access the book through the free trial of sapling?
Thu Oct 08, 2020 8:06 pm
Forum: Empirical & Molecular Formulas
Topic: Sapling Hw Week 1 #10
Replies: 20
Views: 347

### Re: Sapling Hw Week 1 #10

How do we know that the ratio for the problem is 1 to 1 to 1? Are we just assuming this or do we have to figure that out? If so, how do we find the ratio? I assumed that it would be 1:1 because there's no way would be expected to balance it even if it wasn't. Also if you work out the problem using ...
Thu Oct 08, 2020 3:20 pm
Forum: Limiting Reactant Calculations
Topic: Sapling Question #10
Replies: 9
Views: 141

### Re: Sapling Question #10

I googled the molar masses as well hahaha! I think it's clear that having prior understanding of what these organic compounds are is unrealistic for us to already know. It's safe to assume that for future tests or quizzes, we are most likely to be given these molar masses as well other information w...
Thu Oct 08, 2020 3:09 pm
Forum: Limiting Reactant Calculations
Topic: Sapling Q #10-Balancing
Replies: 3
Views: 67

### Re: Sapling Q #10-Balancing

I initially thought that the number before the organic compound was the number of moles but I realized that that was part of the name hahaha. Because I don't see how we can be expected to be familiar with these compounds and balance the equation, I think we should be safe to assume that they are all...