CHEMISTRY COMMUNITY

Gisela F Ramirez 2H

d) How would the rate law differ if the reactions were carried out in an organic solvent?

I am not sure how to answer this, can anyone explain? Thanks!

Gisela F Ramirez 2H

c) The pathway for a reaction is the same in the presence of a catalyst as in its absence, but the rate constants are decreased in both the forward and the reverse directions. d) A catalyst must be carefully chosen to shift the equilibrium toward the products. Decide which are true, and if the state...

Gisela F Ramirez 2H

How do you know which molecule has the strongest oxidation power using reduction potential?

Gisela F Ramirez 2H

How do you know when a molecule has the highest reduction power based off its reduction potential?

Gisela F Ramirez 2H

Thank you so much, this is so helpful. I am also planning on going to medical school and your advice is very much appreciated!

Gisela F Ramirez 2H

On the final, there was a question about choosing the triprotic acid and I totally blanked. What does triprotic mean?

Gisela F Ramirez 2H

Is the Ka and the ionization constant the same thing?

Gisela F Ramirez 2H

I was wondering, why was the ICE table not the right approach?

Gisela F Ramirez 2H

Substance A decomposes in a first order reaction and its half life is 355 s. How much time must elapse for the concentration of A to decrease to a) 1/8 of initial concentration b)1/4 of initial concentration c) 15% of initial concentration d) 1/9 of initial concentration How would I go about solving...

Gisela F Ramirez 2H

N2O5 decomposes by first order kinetics with a rate constant of 3.7*10^(-5) at 298K

For part a, find half life of N205 at 298K, what equation would I use?
For part c, how much time will elapse before the N2O5 concentration decreases from 0,0567 M to 0.0135 M? How would I solve this?

Gisela F Ramirez 2H

Why do some of the problems in the homework have answers with Pt(s) in them? When do we know when to add Pt(s) into our cell diagram?

Gisela F Ramirez 2H

d) Pt(s)|O2(g) | H(^+) (aq)| OH(^-1) (aq) | O2(g) | Pt(s)

I am having a really hard time locating the unbalanced reduction and oxidation reactions, and since I have O2 going to H(^+) and OH(^-1) going to O2, how would I balance these? Like does the hydrogen get balanced first or oxygen?

Gisela F Ramirez 2H

d) P4 (s) ---> H2PO2(^-1) (aq) + PH3 (aq)

oxidizing: 8OH(^-1) +P4 ---> 4H2PO2(^-1) +4e(^-1)
reduction: P4 ---> 4PH3

I have been trying to balance these reactions for so long and I don't get how to balance the reduction half equation? Can someone help?

Gisela F Ramirez 2H

b.) Reaction of bromine with itself (disproportionation)in aqueous solution:

Br2 (l) ---> BrO3(^-1) (aq) + Br(^-1) (aq)

How would I write out the half reactions if I only have one reactant?

Gisela F Ramirez 2H

d.) Reaction of chlorine in water:

Cl2 (g) ---> HClO (aq) + Cl2 (g)

I was wondering how would i work this problem out? Since I only have Cl2 on the reactants side, how do I make the oxidation and reduction half reactions? This is in an acidic solution

Gisela F Ramirez 2H

How would I calculate enthalpy in a reaction that has a constant pressure and constant temperature?

Gisela F Ramirez 2H

C(s) + H2O(g) <---> CO(g) + H2(g)
a. Evaluate K at 900K given that the Gibbs Free Energy of formation for CO and H20 at 900K are -191.28 kJ/mol and -198.09 kJ/mol respectively

what equation would I use to find K?

Gisela F Ramirez 2H

0.020mol of NO2 was introduced into a flask of 1.00L and 2NO2 (g) <---> N2O4 was allowed to come to equilibrium at 298K. To calculate the concentrations of both gases. I use the K(c) from Table 5G.2 and then would I use an ice chart? (since the K(c) in the table is for the reaction N204 <---> 2NO2, ...

Gisela F Ramirez 2H

How does increasing or decreasing the temperature of a reaction affect it?

Gisela F Ramirez 2H

Say youre given a reaction in a constant volume calorimeter, and you have to calculate the change in internal energy. This question gives us the q of a first reaction, q= -3.50 kJ, resulting temp rise of 7.32 degrees celsius Then a second experiment, 100.0 mL of 0.200 M HBr(aq) and 100.0 mL of 0.200...

Gisela F Ramirez 2H

An ice cube of mass 50.0g at 0.0 degrees celsius is added to a glass containing 400.0 g of water at 45.0 degrees celsius. What is the final temp of the system? I understand what to do but when I try to plug everything in, I am not getting the right answer. Im not sure if it's because i have to conve...

Gisela F Ramirez 2H

A calorimeter was calibrated with an electric heater, which supplied 22.5 kJ of energy as heat to the calorimeter and increased the temperature of the calorimeter and its water bath from 22.45 degrees Celsius to 23.97 degrees Celsius. What is the heat capacity of the calorimeter? I was trying to wor...

Gisela F Ramirez 2H

Calculate work for following process beginning with gas sample in a piston assembly with T=305K, P=1.79 atm, and V=4.29 L a.) Irreversible expansion against a constant external pressure of 1 atm to a final volume of 6.52 L I was able to calculate process a, -226 J but for b.) Isothermal, reversible ...

Gisela F Ramirez 2H

Thank you so much!

Gisela F Ramirez 2H

A piece of copper of mass 20.0 g at 100.0 degrees Celsius is placed in a vessel of negligible heat capacity but containing 50.7 g of water at 22.0 degrees Celsius. Calculate the final temperature of water. Assume that no energy is lost to surroundings.

How do I go about solving this problem?

Gisela F Ramirez 2H

Calculate the heat that must be supplied to a copper kettle of mass 400.0 g containing 300.0 g of water to raise its temperature from 20.0 degrees Celsius to the boiling point of water, 100.0 degrees Celsius. (given specific heat capacities for water and copper) Would I find the heat capacity for wa...

Gisela F Ramirez 2H

A piston confines 0.200mol Ne(g) in 1.20L at 25 degrees Celsius. Two experiments are performed: a.) The gas is allowed to expand through an additional 1.20L against a constant pressure of 1.00 atm b.) The gas is allowed to expand reversibly and isothermally to the same final volume which process doe...

Gisela F Ramirez 2H

Calculate the pH of:
a.) 0.63 M NaCH3CO2
b.) 0.65 M KCN

How exactly do I go about working out this problem without a K value? I have been looking at the 6D.1 table and nothing seems to match so I am not sure how to solve it

Gisela F Ramirez 2H

Calculate the pH of:
a.) 0.19M NH4Cl (aq)
b.) 0.055M AlCl3 (aq)

I am stumped on this question. How do I go about it since they did not give me the Ka value?

Gisela F Ramirez 2H

I was wondering, for this problem, I initially went in thinking that I would need to do an ICE box but I found the answer simply by using the equilibrium constant formula. How do you know when to do an ICE box? And also, why do the concentrations of N2 and O2 remain the same?

Gisela F Ramirez 2H

N2 (g) + 3H2 (g) <---> 2NH3 (g) at 400. K, K=41

Find the value of K:
a) 2NH3 (g) <---> N2 (g) + 3H2 (g)
answer: 1/K : 0.024
But how do I find the K value for the other reactions?

b) 1/2 N2 (g) + 3/2 H2 (g) <---> NH3 (g)
c)2N2 (g) + 6H2 (g) <---> 4NH3 (g)

Gisela F Ramirez 2H

Does pressure affect the equilibrium constant?

Gisela F Ramirez 2H

I want to make sure I am right but say you are asked to find the limiting reagent in a chemical reaction and then asked how many moles of that reagent is required, would you use the coefficient in the equation or do you need to solve it with conversions?

Gisela F Ramirez 2H

I want to make sure that I know how to solve this problem: an electron is at about 1.00nm, find the uncertainty in its momentum

How do you go about solving a problem like this?

Gisela F Ramirez 2H

If you are given the momentum and mass of an object, and being told that it has the same momentum as a gamma ray. How do you use the momentum and mass to find the velocity of the object? Would it just be the p=mv equation?

Gisela F Ramirez 2H

if we have a cation before the [M(Y)(X)], do we take that into consideration when asked to name the shape of the coordination compound? Or is the shape based on how many ligands are bound to the central atom?

Gisela F Ramirez 2H

How do you find the second n value, say if they give you n=1 and the wavelength 1.0 10^-9m and ask for the highest energy level. How do you use the H-atom equation to figure out the high energy level?

Gisela F Ramirez 2H

Will a lone pair in the shape automatically make the compound polar?

Gisela F Ramirez 2H

How does polarizing power differ from polarizability?

Gisela F Ramirez 2H

When asked to arrange anions from least to most polarizable, does this mean to arrange them in order of those that can be the least distorted to the most distorted?

Gisela F Ramirez 2H

How can you figure out when a compound is amphiprotic or amphoteric? Is there anything specific i should be looking for?

Gisela F Ramirez 2H

When naming a compound, ethylenediamine will always follow the Bis-, tris-, tetrakis- etc. rule right?

Gisela F Ramirez 2H

Will we need to know the biological importance of coordination compounds for the final, for example the cisplatin example we did in class?

Gisela F Ramirez 2H

How many 02 molecules can myoglobin bind and why?

Gisela F Ramirez 2H

I do not understand what they are? How do they affect the pH?

Gisela F Ramirez 2H

What are induced-dipole forces? How do they differ from dipole-dipole forces?

Gisela F Ramirez 2H

Between H2S and H2Se, explain why H2Se has a higher boiling point.
In this case, even though H2S has dipole-dipole forces, H2Se has stronger LDFs. Why do the LDF dominate dipole dipole forces when dipole dipoles are stronger?

Gisela F Ramirez 2H

Which has the strongest bond?

F2, F2 ^-1, F2 ^+1

Gisela F Ramirez 2H

Which has the longest bond and why? bond order?

F2, F2 ^-1, F2 ^+1

Gisela F Ramirez 2H

An electron was ejected from a sodium metal surface with light of a given frequency. If the wavelength of the ejected electron is 1.1 nm, what was the frequency of the incident light? The work function of sodium is 150.6 kJ/mol. I always get stuck on finding the velocity in the Kinetic energy portio...

Gisela F Ramirez 2H

When being asked to choose the stronger acid, you first look at the bond length and, if that is not comparable you look at the conjugate base right? Does a strong conjugate base mean a stronger acid? Or is it a weak conjugate base that means a stronger acid?

Gisela F Ramirez 2H

Why is NaOH a strong base?

Gisela F Ramirez 2H

How can you tell if a ligand is going to be acting as a polydentate?

Gisela F Ramirez 2H

At Lyndon's review session this friday, I'm not sure if I heard right but we will be asked to find the pH of strong acids, on the final, only right?

Gisela F Ramirez 2H

Why is HCl a strong acid?

Gisela F Ramirez 2H

c.) 0.0092M Ba(OH)2

How do we calculate the pOH? And the pH?

Gisela F Ramirez 2H

A careless lab tech wants to prepare 200.00 mL of a 0.025M HCl solution but uses a volumetric flask of volume 250.0mL. a.) What would be the pH of the desired solution? b.) What will be the actual pH of the prepared solution? How do you find the pH? I know pH= -log[H3O+] but how do we find the molar...

Gisela F Ramirez 2H

Do any of you know if on the final, for the acids and bases part, when we complete the reaction equation will we need to add the states as well?

Gisela F Ramirez 2H

What is the difference between a Bronsted Acid and a Lewis Acid? A Bronsted Base and a Lewis Base?

Gisela F Ramirez 2H

How does the bond angle and s-character relate? For this problem, the answer is that the bond angles increase as the s-character of the hybrids increase, why is this so?

Gisela F Ramirez 2H

When asked, "what atom ratios are the atoms present", does it mean find the empirical formula?

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