CHEMISTRY COMMUNITY

AlyssaPeckham1A

Yes. If pressure is not constant, then we would use w=-nrt ln (v2/v1)

AlyssaPeckham1A

A larger molecule has greater entropy than smaller molecules

AlyssaPeckham1A

Is delta G always equal to zero at equilibrium/ during a phase change?

AlyssaPeckham1A

If no heat is transferred, then q will be equal to zero. This also means that delta U will now be equal to work.

AlyssaPeckham1A

Check the units behind the constant R to see what needs to cancel out in the problem you are solving.

AlyssaPeckham1A

Other than using H+ or OH-, is there a main difference in balancing acidic vs basic reactions?

AlyssaPeckham1A

could someone expand on the concepts behind galvanic/voltaic cells?

AlyssaPeckham1A

could someone explain how to calculate microstates?

AlyssaPeckham1A

Could someone explain how to use bond enthalpies to calculate the change in enthalpy of a reaction?

AlyssaPeckham1A

Could someone elaborate on how to find the units for different rate constants in a reaction?

AlyssaPeckham1A

could someone elaborate on elementary reactions?

AlyssaPeckham1A

could someone further explain the concepts for catalysts and intermediates?

AlyssaPeckham1A

could someone elaborate more on using the Arrhenius equation and its constant?

AlyssaPeckham1A

could someone further explain how to determine reaction orders?

AlyssaPeckham1A

How should we determine which step is the slow step?

AlyssaPeckham1A

For the final do we only need to know the line structures for functional groups or should we also be able to draw the full structure?

AlyssaPeckham1A

Could someone explain how to apply Trouton's rule when solving for the standard enthalpy of vaporization?

AlyssaPeckham1A

Could someone elaborate more on the 2nd law of thermodynamics?

AlyssaPeckham1A

For this problem, how do we know to use 298K for the change in temperature in the equation?

AlyssaPeckham1A

Also to solve for the values of Cvm and Cpm you can use the equations Cvm=3/2*R and Cpm=5/2*R for the molar heat capacity.

AlyssaPeckham1A

To solve part b you would start with the equation Cvm=3/2*R to get the heat capacity at constant volume. I got 12.47 J/mol for Cvm. Then you would plug in the value you got for Cvm and your other known variables into the equation q=m*C*delta T to solve for the heat released.

AlyssaPeckham1A

What homework problems will be covered on test 1?

AlyssaPeckham1A

Would adiabatic walls be almost the opposite of diathermic walls?

AlyssaPeckham1A

The relationship between q and w is also affected by the change in energy of the system which can influence the signs.

AlyssaPeckham1A

Also, the diatomic elements all have standard states at zero.

AlyssaPeckham1A

What are some important phase changes to know? (such as changes between solids/liquids/gases)

AlyssaPeckham1A

A reversible process is when the direction can be reversed by an infinitely small change in a variable. An irreversible process is when an infinitely small change in the external pressure does not reverse the direction of travel of the piston. Also the work a system can do is the greatest in a rever...

AlyssaPeckham1A

Another comment on this is when you're solving for the change in enthalpy for example, a negative value for kilojoules means that the reaction was exothermic and a positive value for kilojoules means that the reaction is endothermic.

AlyssaPeckham1A

Is the value of R in PV=nRT always equal to .082?

AlyssaPeckham1A

When do you know that octet exceptions occur?

AlyssaPeckham1A

For delocalization to occur, do you have to always have resonance?

AlyssaPeckham1A

How do you solve for the oxidation number?

AlyssaPeckham1A

How do you determine if an acid/base is weak or strong?

AlyssaPeckham1A

How do you determine if an element is a Lewis acid?

AlyssaPeckham1A

Another quick way that I determine formal charge is:
1- counting the lone pairs around the atom (each equals 2 electrons)
2- counting the bonds around the atom (each counts as 1 electron)

AlyssaPeckham1A

How do we determine when a dipole moment occurs?

AlyssaPeckham1A

How do you determine when a pi bond is delocalized?

AlyssaPeckham1A

How do you determine if a compound is amphoteric?

AlyssaPeckham1A

Will Arrhenius acids and bases be covered on the final?

AlyssaPeckham1A

Could someone elaborate on strong/ weak acids and bases and give examples for them? Also, how do we determine the type of a certain acid/base?

AlyssaPeckham1A

Could someone elaborate on dipole moments and how to draw them? Also, should we only draw dipole moments when the question specifically asks for them?

AlyssaPeckham1A

How do you determine when/ where to draw sigma and pi bonds?

AlyssaPeckham1A

You would subtract electrons from the 4p and then 4s orbitals (the outer orbitals in the configuration) before the 3d orbital.

AlyssaPeckham1A

Additionally, why does Se have 2 unpaired electrons instead of 4 unpaired electrons?

AlyssaPeckham1A

For your second question, the electron configuration for tungsten is [Xe]4f^14 5d^4 6s^2 instead of [Xe]4f^14 5d^3 6s^2 because tungsten is located in the fourth space over from the start of the d block in period 6. Therefore it's noted as 5d^4 instead of 5d^3. Because the answers for the homework i...

AlyssaPeckham1A

When solving for the uncertainty in position, should the units be in picometers for the final answer or is it ok to leave the units in meters?

AlyssaPeckham1A

The Photoelectric effect shows light behaving as particles/photons. However, light is also described as having some wave-like properties. Does light behave as a combination of particles and waves or mainly as particles?

AlyssaPeckham1A

When converting from a prefix such as nm into meters, should the conversion be before or after we solve the problem?

AlyssaPeckham1A

I believe we use a sig fig rule each time we do a calculation. For addition/ subtraction, the number of decimal places in the answer should have the smallest number of decimal places from the number being added/ subtracted. Example: 112.2+60.23= 172.4 . For multiplication/ division, the number with ...

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