## CALLLLLLLLLLLLLLLLLM???greenspun.com : LUSENET : UR General Chemistry : One Thread |

CAN SOMEONE RELL ME HOW TO FIGURE OUT PROBLEM #'S 5 AND 9 ON THE CALM BB. I KNOW THESE ARE FIRST ORDER REACTIONS, BUT I CANNOT GET THE CORRECT ANSWER.

-- Anonymous, April 06, 2000

since the problems are randomly generated, it would be easier to help if you give a specific problem #. That way it can be explained with specific numbers.

-- Anonymous, April 06, 2000

the problems are as follows: in topic 20, section 3 id#955054238 and id#955054267in topic 19, section 3 id#955054302

-- Anonymous, April 06, 2000

the problems are as follows: in topic 20, section 3 id#955054238 and id#955054267in topic 19, section 3 id#955054302

I would really appreciate a timely response from anyone, thanks

-- Anonymous, April 06, 2000

i am sorry, i gave you the wrong problems. the correct numbers and sections are as follows: topic 15, section 3, problem 5 id#-->955054238 topic 15, section 3, problem 9 id#-->955054267 topic 19, section 3, problem 4 id#-->955054302 why am i not given any credit for this problem: topic 20, section 3, problem 3 id#-->955054617?? the computer saya that it is correct

-- Anonymous, April 06, 2000

I am just writing to let you (Tara) know that all the problems you listed are not assigned, which means, there is no need to do them. Maybe that's why you're not getting credit for some of them.

-- Anonymous, April 06, 2000

what do you mean the problems that i have listed are not assigned. on the BB is says taht we are to do p4-p10 which includes the problems that i have asked for assistance with. As far as for electochemistry( section 20 on CALM) which problems were we supposed o do then? Also, do we need to complete the problem on free energy as well??

-- Anonymous, April 06, 2000

Well, for topic 15, all you ahve to do is section 1 (P1, P2, P4- P10)...you do not need to do section 3. And for topic 20, I'm assuming he means, section 1 (p1-P4) since that's the only section in topic 20 with P4 in it.

-- Anonymous, April 06, 2000

thank you for answering my questions in a timely manner and for clarifying things a bit more. I understand what you are saying now, but i still nedd assistance with topic 15 section 1 problems number 5 and 9. problem 5 has an id#955054238, and problem 9 has an id#955054267. I am sorry, i confused you by saying that tese problems were from section three in topic 15. They are from section 1. sorry about the mixup

-- Anonymous, April 06, 2000

955054238 and 955054267I wish I knew your specific problems with these questions-is it the set up??

One hint I can offer is don't round the answer, try to be as precise as you can-it will tell you 1 is wrong, it wants an answer in decimal form (because the answer is between 0 and 1 here) and is set up to accept answers with many (MANY) decimal places. If you are not within an allowable range (I don't know what that is, sorry) when you round, it will tell you your answers are wrong.

Let me know if this helps, also if this doesn't help let me know what part you are having troubles with.

Good luck Terri

-- Anonymous, April 06, 2000

ok, i am having trouble with the problems that are in tabular form. in one column there is number of atoms and in the other column there is time measured in days. the initial concentration is given the concentrations and days are as follows: time #0f atoms initial time(t=0) 14182 85.8 221 114.4 55 143 13 this is problem number five in section 1 of topic 15. this question is asking for the half-life(in days).the other problem is structured inthe same format; it is as follows: time(seconds) concentration initial yime(t=0) .204 72.9 .152 145.8 .114 218.7 .085 291.6 .063 this question is also asking for the half-life(in seconds). also, this is a first order decay. this is problem number 9 of section 1 in topic 15.

A simple explanation of these problems would really be helpful. I have tried using the formula for the half-life of a first order, but it simply is not working. Could someone explain this problem to me?

Also, will i be given credit for a problem that the computer says is correct, but does not recorded? i have been complaining about this problem for several days, and i haven't gotten an answer. i don't think that it is fair that i get the problem correct according to the computer, but since it is not recorded i don't end up getting any extra credut for some computer glitch. please respond this time concerning this problem.

thanks!!!!!!!!

-- Anonymous, April 07, 2000

I am confused by your problem....I bring up the problems you say you can't solve (with the numbers you gave) but I do not get half life problems, I get reaction order problems. Please double check your problem ID #'s, the section and all that information. I would like to help....

-- Anonymous, April 07, 2000

could you look under the section which says please answer us on the BB. It is here you may gain a better understanding. Besides, all i need is an explanation. I can do the work then. thanks

-- Anonymous, April 07, 2000

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