CHEMISTRY COMMUNITY

Clara Cho 2K

awesome thanks!

Clara Cho 2K

I'm having trouble with part c. I'm getting 2.85 as my rate constant, but the solution says the answer is 2.85*10^12. I'm not understanding how they got to that number. Can someone explain?

Clara Cho 2K

Will the answers to ENDGAME be posted soon?

Clara Cho 2K

thank you!

Clara Cho 2K

When solving an electrolysis problem, do you approach it the same way as a galvanic cell?

Clara Cho 2K

Which approach are we most likely going to be tested on, pre-equilibrium or steady state?

Clara Cho 2K

Which approach are we most likely going to be tested on, pre-equilibrium or steady state?

Clara Cho 2K

When would you use the Arrhenius equation?

Clara Cho 2K

How much of kinetics do you think will be on the final?

Clara Cho 2K

Are the review sessions still going on?

Clara Cho 2K

If a reaction is thermodynamically favored, but it is kinetically trapped, will the reaction ever happen?

Clara Cho 2K

I'm pretty sure you do not count the solids and liquids.

Clara Cho 2K

Do you think we will still meet for discussion?

Clara Cho 2K

When would I use a comma when writing a cell diagram?

Clara Cho 2K

how can you tell if the reaction will favor the forward or reverse process from the E value?

Clara Cho 2K

how do you find the moles of electrons transferred when given the balanced chemical reaction and asked to find the half reactions?

Clara Cho 2K

Why do we equate change in free energy to work max?

Clara Cho 2K

What does an electrochemical series mean?

Clara Cho 2K

how do you know when a metal will dissolve in solution?

Clara Cho 2K

Can you use the Nernst equation to determine if a reaction is at equilibrium?

Clara Cho 2K

Cam someone explain the connection between positive and negative standard potentials and its thermodynamic tendencies with hydrogen?

Clara Cho 2K

when you're given a balanced chemical reaction, how do you figure out what n is in the equation for Gibbs free energy?

Clara Cho 2K

why is delta G equal to zero when a reaction is at equilibrium?

Clara Cho 2K

When you put the two half reactions together should the electrons cancel each other out?

Clara Cho 2K

Can some one explain to me #12b from the pizza rolls packet? How do I divide the process up into three steps?

Clara Cho 2K

I feel like I'm doing #6 correctly , but I'm not getting the correct answer. Can someone explain how I calculate the work of expansion for the step with the reversible, isothermal expansion?

Clara Cho 2K

Can someone please explain why the v2/v1 for He is 4 and and 4/3 for Kr for problem 5?

Clara Cho 2K

Why is is PdV insignificant when a reaction is at constant pressure and involves solids and liquids?

Clara Cho 2K

The book talks about two different constants for monoatomic molecules and linear molecules.Do we need to know both?

Clara Cho 2K

The reaction of 1.40 g of carbon monoxide with excess water vapor to produce carbon dioxide and hydrogen gases in a bomb calorimeter causes the temperature of the calorimeter assembly to rise from 22.113 8C to 22.799 8C. The calorimeter assembly is known to have a total heat capacity (calorimeter co...

Clara Cho 2K

Is the external pressure and pressure inside the system equal in a reversible process?

Clara Cho 2K

How would I solve this problem, please help :) Calculate the heat that must be supplied to a copper kettle of mass 500.0 g containing 400.0 g of water to raise its temperature from 22.0 degrees C to the boiling point of water, 100.0 degrees C. What percentage of the heat is used to raise the tempera...

Clara Cho 2K

Can someone explain why there is a negative sign in the work equation?

Clara Cho 2K

Will most enthalpy calculations be utilizing standard reaction enthalpies?

Clara Cho 2K

Why is using bond enthalpies the least accurate method to calculate enthalpy changes?

Clara Cho 2K

You're given pKb so you can find Kb. However, in the reaction given you need Ka because HF is an acid. Solve for Ka by using Ka*Kb=Kw, K =1*10^-14. Ka is now your equilibrium constant.Then use the given initial concentration of hydrogen fluoride, 0.12M, and complete an ice table using the Ka constan...

Clara Cho 2K

The reaction is at equilibrium.

Clara Cho 2K

What is the chemical equation for the proton transfer equilibrium in water and the corresponding expression for Ka?

Clara Cho 2K

How do you know when to change the sign of a bond enthalpy?

Clara Cho 2K

If enthalpy of fusion is an endothermic reaction, would freezing be an exothermic reaction?

Clara Cho 2K

Besides enthalpy, what other functions are considered state functions?

Clara Cho 2K

Do you include solids and liquids in the ice table?

Clara Cho 2K

Is the partial pressure the product of the mole fraction and the total pressure?

Clara Cho 2K

In what circumstances do you use the combined gas law?

Clara Cho 2K

what is autoprotolysis?

Clara Cho 2K

Does change in pressure affect the concentration of the reactants and products?

Clara Cho 2K

Without adding any more products, how would you increase the yield of products of a reaction?

Clara Cho 2K

When can you assume the change is insignificant when solving cubic equations?

Clara Cho 2K

When does the reaction favor the products and when does it favor the reactants?

Clara Cho 2K

How is the equilibrium constant is related to the standard Gibbs free energy of reaction?

Clara Cho 2K

In an equilibrium reaction, when does the reverse reaction begin?

Clara Cho 2K

How is the equilibrium reaction affected by increasing the concentrations of products?

Clara Cho 2K

How does increasing the concentration of reactants increase the equilibrium concentration of products?

Clara Cho 2K

how does the difference in electronegativity contribute to the strength of an acid?

Clara Cho 2K

does resonance make an acid lose protons more easily or hold on to its protons?

Clara Cho 2K

how much naming will be on the final and are we supposed to memorize that chart he gave us?

Clara Cho 2K

can an electron transition from n=2 to n=1 ? wouldn't the velocity be negative and the wavelength also negative if that was the case?

Clara Cho 2K

How does resonance make an acid stronger?

Clara Cho 2K

Why is HI a stronger acid than HF?

Clara Cho 2K

what are oxoacids?

Clara Cho 2K

How do you identify an amphoteric compound?

Clara Cho 2K

what does it mean to be polydentate?

Clara Cho 2K

what is diamagnetism?

Clara Cho 2K

what is paramagnetism?

Clara Cho 2K

what is bond order?

Clara Cho 2K

A σ bond is said to be "symmetric with respect to the internuclear axis", is the same true of a π bond ?

Clara Cho 2K

What has the higher normal melting point: CHI3 or CHF3? The answer in the book is CHI3. So I'm assuming the answer is CHI3 because Iodine is the bigger and will form larger london dispersion forces, but isn't a stronger dipole moment formed in CHF3 because fluorine is more electronegative than carbo...

Clara Cho 2K

How do you use the De Broglie equation?

Clara Cho 2K

How do you calculate how many photons in total cause electron excitations? How do you determine how many electrons are excited assuming one photon interacts with one hydrogen atom?

Clara Cho 2K

How do you determine the principle quantum number of the state an electron is excited to?

Clara Cho 2K

is the change in energy of a hydrogen atom positive or negative when it absorbs a photon?

Clara Cho 2K

how would you calculate the wavelength of the incoming light, if the frequency of the light is fixed and you're given a value for the KE?

Clara Cho 2K

What determines how many electrons are ejected in an experiment?

Clara Cho 2K

How would you calculate the longest wavelength of light that can remove an electron when given the work function?

Clara Cho 2K

How do you know which atom to put a negative charge on?

Clara Cho 2K

How does size affect bond length?

Clara Cho 2K

are all metals polarizable?

Clara Cho 2K

Can someone explain Van de Waals forces?

Clara Cho 2K

Are hydrogen bonds the strongest intermolecular force?

Clara Cho 2K

If I'm solving for the energy of a photon, would I use J/mol or J/electron?

Clara Cho 2K

If I'm given the work function in kJ.mol^-1, do I have to convert it to Joules per electron to use it in my calculations for energy of a photon?

Clara Cho 2K

What's the difference between a line structure and a lewis structure?

Clara Cho 2K

What is the significance of an expanded valence shell"?

Clara Cho 2K

what is a resonance hybrid?

Clara Cho 2K

Does a delocalized bond make the molecule more reactive?

Clara Cho 2K

How do you know which atom can hold more of the negative charge?

Clara Cho 2K

Most of the equations will be given to us on the formula sheet. I think you just have to understand what KE is and the concepts behind it.

Clara Cho 2K

Does an electrons quantum numbers give you the ground state electron configuration?

Clara Cho 2K

How does the second quantum number describe shape?

Clara Cho 2K

In which situations would you use the Schrodinger equation and which one would you use De Broglie's equation?

Clara Cho 2K

How and in what situations would you use the Rydberg equation?

Clara Cho 2K

Can someone explain what nodal planes are?

Clara Cho 2K

How does diffraction prove that an electrons wavelike properties?

Clara Cho 2K

Under what parameters can De Broglie's equation be used?

Clara Cho 2K

If the wavelength of the electron is found to be less than 10^-15, does the electron not exhibit any wave like properties?

Clara Cho 2K

I have an online version of the text book and I'm struggling to find the questions he assigned because the numbering is weird. Is anyone else experiencing this? And if so, how did you guys figure it out?

Clara Cho 2K

if you increase the intensity of a light source, what happens to the kinetic energy?

Clara Cho 2K

Would the threshold energy or work function be given to us when solving a problem?

Clara Cho 2K

What is the difference between the electromagnetic field and the magnetic field?

Clara Cho 2K

What are the units for velocity?

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