CHEMISTRY COMMUNITY

704564167

Why in part b do you subtract the initial value of O2 instead of adding it?

704564167

Would it be wrong to name this 1,1-dimethyl-2-propylcyclopentane? Does there need to be the iso- in front of the propyl or is it sufficient enough to just say propyl since there are 3 carbons on that substituent.

704564167

When figuring out which number carbon a substituent is bonded to, you always count so that it will be the lowest number carbon. If there are more than one substituents, the same rule still applies. If you are deciding between, for example, 3, 6, 7 and 2, 6, 9 you would not add them up and see which ...

704564167

Determine the rate constant for each of the following first-order reactions, in each case expressed for the rate of loss of A: (c) 2A --> B + C, given that [A] 0 =0.153 mol/L and that after 115s the concentration of B rises to 0.035mol/L. Why, in order to find [A] 115s must you subtract the initial ...

704564167

Assuming the carbon atoms in glucose have 0 oxidation state whereas each H is +1, and each O -2, how many electrons are involved in glucose oxidation? C 6 H 12 O 6 (aq) +O 2 (g) --> H 2 O (l) +CO 2 (g) The answer says that C in CO 2 has a +4 oxidation state Since ther...

704564167

How do you know that you need to write the balanced equation for each of the reactants and products first instead of just saying that delta H = the sum of the enthalpy of the products - the sum of the enthalpy of the reactants? From doing the second way you get the same answer but positive (312 kJ/m...

704564167

If U = q + w, why is the work=0 for this problem?

704564167

Example 8.13 Estimate the enthalpy of the reaction between bromine and propene to form 1, 2-dibromopropane. The enthalpy of vaporization is Br 2 is 29.96 kJ/mol, and that of CH 3 CHBrCH 2 Br is 35.61kJ/mol. The reaction is Br 2 + CH 3 CH=CH 2 --> CH 3 CHBrCH 2 Br I understand that you have to find t...

704564167

What does it mean that something is an extensive property of matter versus intensive?

704564167

Calculate the work for each of the following processes beginning with a gas sample in a piston assembly with T=305K, P=1.79atm, and V=4.29L: (a) irreversible expansion against a constant external pressure of 1.00atm to a final volume of 6.52L (b) isothermal, reversible expansion to a final volume of...

704564167

12.77 A 3.38 sample of the sodium salt of alanine, NaCH 3 CH(NH 2 )CO 2 is dissolved in water and then the solution is diluted to 50.0mL. For alanine, K a1 =4.57 x 10 -3 , K a2 =1.30 x 10 -10 . What is the pH of the resulting solution? The answer key uses the equation pH = 1/2(pK a1 + pK a2 ) but I ...

704564167

J.5 Complete the overall equation and write the complete ionic equation and the net ionic equation for each of the following acid-base reactions. If the substance is a weak acid or base, leave it in its molecular form in the equations. (b) (CH 3 ) 3 N + HNO 3 --> (CH 3 ) 3 NHNO 3 How do you know tha...

704564167

You don't have to convert the bars to any other units. I understand that in order to get the right answer you have to flip the reaction and inverse the K value but I don't understand why that works and why that gets you the right answer as opposed to leaving it the normal way and solving it without ...

704564167

The equation is like that because K= (P_PCl3)(P_Cl2)/(P_PCl5)

and so when you're solving for the partial pressure of P_PCl3 you can rearrange the equation to be this:

P_PCl3= (K)(P_PCl5)/(P_Cl2)

After plugging in the values you will get P_PCl3=(25)(1.18)/(5.43)

704564167

Which compound is more ionic?
(a) Cl2O or Na2O
(b) InCl3 or SbCl3
(c) LiH or HCl
(d) MgCl2 or PCl3

How can you determine which compound is more ionic? Is there a trend we should know?

704564167

The B2 configuration skipped the third sigma bond because B has a less than 8 electrons. When at least one of the elements has less than 8 electrons the pi bonds and sigma bonds are flipped and the pi bonds will have lower energy. This is also shown on pages 97 & 98 of the course reader if you w...

704564167

This is due to the fact that the problem stated "each P atom is connected to 3 other P atoms." The only way that this can be possible is if there is a diamond that connects in the middle (like an X). It is different from most other Lewis structures that we see.

704564167

Can someone explain the difference between an ion being highly polarizable and having high polarizing power?

704564167

For letter (a) Silver (Ag) why is the electron configuration [Kr] 4d^10 5s^1 versus [Kr] 4d^9 5s^2?

Also, if this is the case, for letter (f) Iodine (I) why is the electron configuration [Kr] 4d^10 5s^2 5p^5 and not [Kr] 4d^10 5s^1 5p^6?

704564167

The reason visible light will not be able to break the bond is because you end up with a wavelength equal to 344 nm. By looking at Table 1.1 (Page 4), visible light requires a wavelength from 420nm to 700nm. Ultraviolet rays however require a wavelength of about 350nm. Because of this, visible light...

CHEMISTRY COMMUNITY

Search found 20 matches

Re: 2013 Final Question 4A + B Clarifications

Re: Exercise 1.16 Numbering Carbons in Parent Chain

Re: Naming Substituents and Carbon Pair

Homework 15.23 (c)

Winter 2015 Midterm Q8C

Homework 8.57

Re: 8.53- Calculating the change in internal energy

Textbook Example 8.31

Extensive vs. Intensive

Homework 8.27

HW 12.77 (Calculating pH of alanine)

Fundamentals J.5 (Writing ionic equations)

Re: 2013 Quiz 3 Preparation #10

Re: Partial Pressure Calculation?

How do you know if a compound is ionic?

Re: Valence electron configuration

Re: 4.39 from Homework

Question about Polarizability

Homework 2.43 - Electron configuration

Re: Homework 1.65 Electromagnetic Radiation