CHEMISTRY COMMUNITY

Vanessa Reyes_1K

What is the difference between a catalyst and an intermediate component?

Vanessa Reyes_1K

For A, the frequency factor, what is meant by "correct" orientation when reactants collide versus just any given orientation? How do you know if the positioning is correct or not?

Vanessa Reyes_1K

If a reactant is a zero order reactant, is it included when writing out the overall rate law for the entire reaction?

Vanessa Reyes_1K

Is the molecularity related to the amount of reactants in a reaction? Is it related to the order of the reaction?

Vanessa Reyes_1K

When is it appropriate to use the pseudo 1st order for a reaction?

Vanessa Reyes_1K

Does the order of a reactant have to always be a positive, whole number?

Vanessa Reyes_1K

How do you know when you will need to add an inert electrode, such as platinum, in the cell diagram when it is not mentioned in the reaction?

Vanessa Reyes_1K

For this problem, why does the n=6??

Vanessa Reyes_1K

For this problem, why is there a coefficient of 3 in front of (Cr2O7)2- and (C2H40)?

Vanessa Reyes_1K

In what cases are we supposed to use the Van't Hoff equation ever deltaG=deltaH - TdeltaS?

Vanessa Reyes_1K

Are all solid metals conductors or are platinum and graphite the only conductors we should know?

Vanessa Reyes_1K

Is there a relationship between cell potential and electromotive force? Lavelle used E to represent both so I don't know what the differences are between them

Vanessa Reyes_1K

Can someone explain the difference between residual and positional entropy?

Vanessa Reyes_1K

For the midterm will we be expected to explain the laws conceptually or just through equations?

Vanessa Reyes_1K

For which equations will we use just R versus using 5/2R and 3/2R for an ideal gas?

Vanessa Reyes_1K

Can someone explain please explain how they worked through this problem. Thanks!

Vanessa Reyes_1K

I thought the number of moles was needed to calculate the standard entropy of vaporization. What do we use if no mass is given the question?

Vanessa Reyes_1K

For this problem, you use the q=n(delta H) right?

Vanessa Reyes_1K

Why are the reaction enthalpies for only CO and H20 used?

Vanessa Reyes_1K

How is Kinetic Energy calculated in this problem?

Vanessa Reyes_1K

For this problem why is SO2 the limiting reactant if there are equal amounts of reactants and SO2 has a greater coefficient, why would it be the limiting reactant?

Vanessa Reyes_1K

How do you rank a list of acids when given their pKa or pKb values?

Vanessa Reyes_1K

The tables used for this problem don't have the exact acids/bases requested in the problem... do you convert the values?

Vanessa Reyes_1K

Hey can someone explain what autoprotolysis is? When is it used in acid and base reactions? Thanks!

Vanessa Reyes_1K

For this problem how do you calculate the molarity of H30+ ?

Vanessa Reyes_1K

For this problem how do you calculate molarity from pOH? Is it even necessary to find the pOH?

Vanessa Reyes_1K

After using the quadratic to solve for x, how do we know which outcome is valid if both numbers are positive?

Vanessa Reyes_1K

I keep getting a different answer for 33a in the 6th edition, can someone explain how they solved this one out? Thanks!

Vanessa Reyes_1K

When using the formula PV=nRT t convert between partial pressure and concentration, what is used for R? Is it a constant or should it be given in the problem?

Vanessa Reyes_1K

Hey can someone explain this problem? Thanks!

Vanessa Reyes_1K

I'm still confused on how to determine if a molecule is an acid or base from the lewis structures...can someone explain?

Vanessa Reyes_1K

In hw problem 119, what is meant by the proton transfer equilibrium?

Vanessa Reyes_1K

Is it implied that a strong acid will have the same pH at H3O+ because the molecule completely dissociates?

Vanessa Reyes_1K

What exactly is a chelate? Does this strengthen or weaken the bonding of the complex?

Vanessa Reyes_1K

When is the prefix aqua- used?

Vanessa Reyes_1K

Can someone explain #33? Also, does polydentate just mean that the central atom is bonded to more than one other atom? Thanks!

Vanessa Reyes_1K

Are all compounds containing a period 3 or below element considered hypervalent compounds as a result of the d-orbital?

Vanessa Reyes_1K

The text explains that according to MO theory, electrons are delocalized over entire molecule, is this true for molecules that don't have resonance as well? If so, what is the difference?

Vanessa Reyes_1K

Hi, can someone clarify the concept of bonding orbitals and anti bonding orbitals please? Thanks!

Vanessa Reyes_1K

Hi! I'm getting confused about the difference between VSEPR notation and hybridization formulas. Is there a relationship between the structure or are they completely independent? Thanks

Vanessa Reyes_1K

Hi! I'm also confused about the concept of hybridization, if anyone could explain that would be awesome, thanks!

Vanessa Reyes_1K

How does the amount of repulsion between atoms correlate to the atoms being placed in 1 plane or multiple planes around the central atom?

Vanessa Reyes_1K

Can someone clarify the VSEPR model and explain how the repulsion strength of lone-lone pair is greater than the bonded-bonded pair? Thanks!

Vanessa Reyes_1K

Are the bonds holding the hydrogen atoms to the oxygen atoms in a water molecule also hydrogen bonds, or covalent bonds?

Vanessa Reyes_1K

So if a molecule has a dipole moment it will then have a net charge and therefore be polar? Or does polarity and dipole moments have no direct relationship?

Vanessa Reyes_1K

When calculating electronegativity difference, will the values be given or do we have to know how to solve for the measurement?

Vanessa Reyes_1K

I know he mentioned it in lecture, but can someone explain what a coordinate covalent bond is and how it works please? Thanks!

Vanessa Reyes_1K

Will we have to know how to calculate bond lengths or know the trend for bond lengths for the midterm?

Vanessa Reyes_1K

What is meant by formal charge? How do you identify formal charge over just charge?

Vanessa Reyes_1K

Can someone please explain why removing a second electron is more difficult and why the second ionization energy of an element is always higher? Thanks!!

Vanessa Reyes_1K

In the questions it is stated that resonance structures are possible when satisfying the octet rule. What does this mean and how does it apply to the context of the problem?

Vanessa Reyes_1K

For problem 1.69b do you have to convert electron volts to joules, and then use the E=hc/frequency equation?

Vanessa Reyes_1K

Problem 1.59 reads: "Each second a certain lamp produces 9.8 x 10^20 photons with a wavelength of 434 nm. How much energy (in joules) is produced as radiation at this wavelength?". Where the does the number of photons fit into an equation?

Vanessa Reyes_1K

For problem 43 in the 6th edition book, what is meant by "minimum uncertainty"? How do you solve for it?

Vanessa Reyes_1K

Hey for homework problem #15, 6th edition, can someone explain how to solve for n?

Vanessa Reyes_1K

What exactly do these series represent in terms of energy?

Vanessa Reyes_1K

For problem 9 I am getting the right numbers with the wrong powers of ten. Any quick tips for how to convert between these more easily?

Vanessa Reyes_1K

For homework problem F17 6th edition, what is meant by "mass spectrum"?

Vanessa Reyes_1K

For problem F9 6th edition, do you divide the percentages by the molar mass of their respective elements, or by the molar mass of the entire compound?

Vanessa Reyes_1K

For problem E23c) 6th edition, the problem asks to calculate the unknown amounts in moles and later asks to find the amount of F in ions. Which should we be looking for?

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