CHEMISTRY COMMUNITY

Feng Ming Li 2K

Since Valentine's day is coming up, this would be appropriate to ask someone you have been wanting to talk to! Good luck~

Are you a Carbon sample? Because I want to date you.

Feng Ming Li 2K

The entropy change for a monatomic molecule is greater than that of a diatomic molecule because it has a larger number of particles. Shouldn't the diatomic molecule have a larger number of particles since there would be two molecules? Why is the entropy change bigger for the monatomic molecule?

Feng Ming Li 2K

When calculating the standard reaction enthalpy, why can't I just ignore HCl (g)-> HCl(aq)? The 6HCl (aq) from 2Al(s) + 6Hcl(aq)-> A AlCl3 (aq) +3H2(g) can be cancelled from H2 (g) +Cl2 (g)-> 2HCl(g) by multiplying the whole equation by 3. Also, why is the final answer -704 when the sum of everythin...

Feng Ming Li 2K

Cu(s)|Cu^{2+}||Ce^{4+}, Ce^{3+}|Pt(s) Hi, so when I was doing the Standard cell potential problems, I noticed that Platinum is sometimes in the beginning or end of the equation set. How come Platinum is not taken into account when we calculate the standard cell potentials? Also, why is there a comma...

Feng Ming Li 2K

The second equation: 2Al (s) + O2 (g) --> Al2O3 (s) is turned into 2Al (s) + 3/2 O2 (g) ---> Al2O3 (s). How did the O2 changed into 3/2 O2 without changing the other elements in the balanced equation?

Feng Ming Li 2K

Hi, a Constant P Calorimetry stands for constant pressure calorimetry and it measures the change in enthalpy of a reaction at constant pressure. A Constant V calorimetry, constant volume calorimetry, measures the heat of combustion of a reaction.

Feng Ming Li 2K

How do you determine if it is a strong acid or base or if it is a weak acid or base? Do you just memorize the strength from a chart?

Thanks

Feng Ming Li 2K

There are several other criterion to determine if it is a strong or weak base: - Water-soluble ionic compounds that contain hydroxide ions (OH-) are strong bases. -Anions in ionic compounds with except OH-, Cl-, HSO4-, NO3-, ClO4-, HSO4-, and H2PO4- are weak bases. These should be with group 1 or 2 ...

Feng Ming Li 2K

What is the most obvious way to tell the difference between Bronsted acids or bases and Lewis acids and bases? How do you label compounds with the correct classification? Thanks!

Feng Ming Li 2K

For the balanced equation of part A, the answer is 2A -> B+ 2C. How come it's not just A-> B+C ? Thanks!!

Feng Ming Li 2K

Write the reaction quotient Q for (a) 2 BCl3(g) + 2 Hg(l) ---> B2Cl4(s) + Hg2Cl2(s) (b) P4S10(s) + 16 H2O(l) ---> 4 H3PO4(aq) + 10 H2S(aq) (c) Br2(g) + 3 F2(g) ---> 2 BrF3(g) If I use the formula in the book which is Q= [Products]/[Reactants]. I would get a different answer from what is shown in the...

Feng Ming Li 2K

According to the compound, there are two [Co(NH3)3(OH2)3] because there is a subscript, which is 2, outside of the bracket. Based on that information, you can tell that there are two complex ions, which are [Co(NH3)3(OH2)3]2. Since (SO4)3 is outside of the bracket, it is its own ion. Sulfate, (SO4)3...

Feng Ming Li 2K

I understand that for bent, there is at least one lone pair, however, is there an easy way to figure out the molecule is linear or bent, or do I have to memorize VSEPR. For example, I3- is linear while SO2 is bent.

Feng Ming Li 2K

For O3, there is a dipole moment because if you calculate the formal charges of the oxygen molecules, you would get 0, +1, and -1. The central oxygen molecule would have a charge of +1, making the two other oxygen molecules more negative. Therefore, the dipole would be pointing away from the central...

Feng Ming Li 2K

since there are 6 carbons, you have to bond the carbons first and then attach the hydrogen and the oxygen molecules to each carbon. After that, you can focus on the double bonds and the formal charges to ensure that it is the correct lewis structure.

Feng Ming Li 2K

The question is: Draw the Lewis structure and determine the formal charge on each atom in (c) CO.

Since oxygen can only form two bonds, how come in this problem, oxygen can form a triple bond with carbon?

Feng Ming Li 2K

Here is the question: In a nanotechnology lab you might have the capability to manipulate individual atoms. The atoms on the left are gallium atoms (molar mass 70 g*mol^-1), those on the right are atoms of astatine (molar mass 210 g*mol^-1). How many astatine atoms would the pan on the right have to...

CHEMISTRY COMMUNITY

Search found 17 matches

Re: Chemistry Jokes

Monatomic vs Diatomic

Winter 2011 Midterm Q2A

General Cell Reaction Question

Homework 8.55

Re: Constant P and Constant V Calorimetry

strength of acids/ bases

Re: Determining weak bases

Bronsted acids or bases Vs Lewis acids and bases

Homework 11.89 balanced equation

Homework 11.13 Reaction Quotient Q

Re: Naming Complexes and coordination compounds

Distinct DIfference between Linear and Bent

Re: Polarization of a molecule with loose electrons

Re: Problem 3.103

Homework 3.49 part c

Fundamentals E.3