CHEMISTRY COMMUNITY

Rhiannon Imbeah 2I

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

Rhiannon Imbeah 2I

In the example of the homogeneous catalyst (nitric oxide conversion), in the very last step, how was 3/2 O₂(g) converted to O₃(g)? Thank you!

Rhiannon Imbeah 2I

In regards to alkenes, it was said in lecture that in a chemical reaction the pi-bond would break rather than the sigma bond. Why is this?

Rhiannon Imbeah 2I

In the Pre-Equilibrium approach is the 2nd step always the slow step?

Rhiannon Imbeah 2I

When looking at the reverse rate (k') of a reaction, why is a lower rate constant required for a higher energy barrier? Visa versa for forward reaction (k), why is a higher rate constant required for a lower energy barrier?

Rhiannon Imbeah 2I

Will we ever have to use this rate law to calculate the product concentration or is it only used for reactant concentrations?

Rhiannon Imbeah 2I

In the course under the section METHODS OF INITIAL RATES, the question was asked How does initial rate depend on the concentration of nitrogen dioxide [NO_{2 ?} What was the answer to this question?

Rhiannon Imbeah 2I

"Don't trust atoms, they make up everything." ;)

Rhiannon Imbeah 2I

Yes, I had to balance it but forgot to type it in. Thank you for the clarification.

Rhiannon Imbeah 2I

In question 8.65 the following equations:

1) 2NO +O2 --> 2NO2
2) 2NO2 + O2 --> N2O5

With the final equation reading:

2NO + 3/2 O2 --> N2O5

Following the process it appears that 2NO2 was cancelled out of the first and second, but why is that?

Thank you for your help!

Rhiannon Imbeah 2I

Thank you

Rhiannon Imbeah 2I

Hi,

Can someone clarify the reason why temperature and pressure are state functions but work is not? Thank you.

Rhiannon Imbeah 2I

Just a quick technical question. For example, if you had a compound with six ammines it would be hexa and ammine. Would you write the name as hexaamine or hexammine?
Thank you!

Rhiannon Imbeah 2I

Thank you!

Rhiannon Imbeah 2I

Oh ok. Would this also include the cations that are from groups 1 and 2 on the periodic table?

Rhiannon Imbeah 2I

In a section on salts as acids and bases, the elements Na and Cl were referred to as spectator ions? Is there a specific definition for spectator ions or is this simply a colloquial term?
Thank you.

Rhiannon Imbeah 2I

Oh yes! Thank you very much

Rhiannon Imbeah 2I

Hello,
Just a question about the concept of weak acids and bases. How can a weak acid or base act as a buffer if the do not fully dissociate? Wouldn't it suffice to use a strong acid or base?

Thank you

Rhiannon Imbeah 2I

In an example in the course reader for calculating the pH of the 0.15M NH4Cl, the given Kb for NH3 = 1.8x10^-5. There is a step that calculated an amount for Ka by dividing Kw by Kb:

Ka Kb=Kw=10^-14

Ka =Kw/Kb= 5.6x 10^-10.

I am not sure how this answer for Ka was calculated.

Rhiannon Imbeah 2I

For the following equations: NH4+ (aq) + H2O (l) ⇌ NH3 (aq) + H3O+ (aq), would only the concentration of H2O be removed or are aqueous solutions also not counted in the equilibrium constant?

The answer could either be:

K=[NH3][H3O]/[NH4]
or
K= 0

Thank you:)

Rhiannon Imbeah 2I

Yes, I understand now. Thank you!

Rhiannon Imbeah 2I

This was a question in the course and I'm not sure if we went over it in lecture:

For the reaction N2(g)+3H2(g) (--->)(<----) 2NH3(g)

How would you increase increase the yield of ammonia without adding more reactants?

Thank you.

Rhiannon Imbeah 2I

Hello, I am revisiting the Molarity and Dilution module. Question 5 in the post-module section is asking for the final molarity. After I finished converting the volume in mL to L, I was moving on to the molar calculations and the measurement is given in grams. Is the next step to convert the grams i...

Rhiannon Imbeah 2I

In one of the post-assessment question regarding balancing chemical equation, we are asked to find the net number of moles produced. How would you go about finding the net number of moles produced in a chemical reaction? Thank you

Rhiannon Imbeah 2I

In one of the post-assessment question regarding balancing chemical equation, we are asked to find the net number of moles produced. How would you go about finding the net number of moles produced in a chemical reaction? Thank you

Rhiannon Imbeah 2I

Thank you!

Rhiannon Imbeah 2I

How do you determine which atom or atom group is the highest priority?

Rhiannon Imbeah 2I

I have the 5th edition chem textbook. Which chapter(s) go over the section on Thermodynamics and Kinetics of Organic reactions?

Rhiannon Imbeah 2I

Thank you for posting this!

Rhiannon Imbeah 2I

In an equilibrium constant, which substances are not considered?

CHEMISTRY COMMUNITY

Search found 30 matches

Catalyst vs. Intermediate Species

Lecture Example: Homogeneous Catalyst

Question Regarding Alkenes

Pre-Equilibrium Approach

Ratio of Rate Constants (Energy Barriers)

Question About the 1st Order REaction Rate Law

Method of Initial Rates: Course Reader Question

Re: Post All Chemistry Jokes Here

Re: Question 8.65

Question 8.65

Re: State Property Difference

State Property Difference

Naming with Ammines [ENDORSED]

Re: Spectator Ions?

Re: Spectator Ions?

Spectator Ions?

Re: Finding Ka from Kw/Kb [ENDORSED]

Weak Acids and Bases as Buffers [ENDORSED]

Finding Ka from Kw/Kb [ENDORSED]

Aqueous Solutions in Equilibrium Constant

Re: Increasing yield without adding reactants

Increasing yield without adding reactants

Question About #5 on Post Module

Calculating Net Moles

Calculating Net Moles

Re: Highest Priority Atom.

Highest Priority Atom.

Thermody. and Kineticsof Organic Rxns Textbook Review

Re: Useful Summary of Thermodynamic Definitions

Re: Homo/Heterogenous Equilibria