Questions Asked on
October 14, 2006

Solvents
Question: Each of the solvents given should effectively separate one of following mixtures by TLC. Match the appropriate solvent with the mixture that you would expect to separate well with that solvent. Select your solvent from the following: hexane,
asked by Sheryl 
Rf values
Question: Consider a sample that is a mixture composed of biphenyl, benzoic acid and benzyl alcohol. The sample is spotted on a TLC plate and developed in a dichloromethanecyclobutane solvent mixture. Predict the relative Rf values for the three
asked by Sheryl 
Calculus
A plane flying with a constant speed of 14 km/min passes over a ground radar station at an altitude of 7 km and climbs at an angle of 45 degrees. At what rate, in km/min is the distance from the plane to the radar station increasing 2 minutes later? I know
asked by Michael 
Calculus
Suppose that you can calculate the derivative of a function using the formula f(x) = 2f(x) + 4x. If the output value of the function at x=4 is 3 estimate the value of the function at 4.012. Linear Approximation right? I'm not seeing an f'(x) anywhere. Can
asked by Michael 
economics
Q: The market demand and supply curves for an agricultural product are as follows: Qd = 4500250P and Qs = 200p where quantities are in thousands of bushels per annum and price is in dollars per bushel. the government wishes to acheive a higher point on
asked by ratboy 
Physical Chemistry HELP!!!!!
A solution of the sugar mannitol ( molar mass 182.2 g/mol ) is prepared by adding 54.66 g of mannitol to 1.000 kg of water. The vapor pressure of pure liquid water is 17.54 torr at 20o C. Mannitol is nonvolatile and does not ionize in aqueous solution. a.)
asked by Lan 
PLEASE HELP! PHYSICAL CHEM
The measured osmotic pressure of seawater is 25 atm at 273K. a.) What is the activity of water in seawater at 273 K? Take the partial molar volume of water in seawater to be 0.018 M1. b.) The vapor pressure of pure water at 273 K is 4.6 torr. What is the
asked by Amy 
History
Hi, I'm doing a History Project on the First Emperor of China, Qin Shihuangdi, and wondered if anyone could tell me when he was born and when he died? I have been on lots of websites but the dates are all in the wrong order, making it look like he died
asked by Paige 
English subect/verb agreement
Which of the following sentences does illustrate subjectverb agreement? 1. Tricia,as well as all her colleagues, are being trained on new equipment. 2. Here comes your teachers. 3. That box of two dozen eggs need to be put in the refrigerator. 4. The
asked by Anonymous 
Please Please help! English
Which of the following sentences DOES NOT illustrate subject verb agreement. 1.Each of the players need a locker. 2.He said that the computer is broken. 3.There go the members of the cast. 4.We knew that rivers flow south. 1.Each of the players need a
asked by Anonymous 
science
what product is left when dilute sulphuric acid and zinc go together? (Broken Link Removed) dissolved in water, of course, the water that was carrying the H2SO4.
asked by monty 
economics
Thank you so much economyst but i do'nt understand the ans for part (b) The demand function for a well known economics textbook is: P = 100  .005Q The publisher must pay $20 per book in printing and distribution costs and, in addition, it must pay the
asked by tinky 
microeconomics
John purchases 12 CDs and 15 cheese pizzas in a typical year. If cheese pizzas are inferior goods, would Mike be indifferent between receiving a $30 gift certificate at a local music store and $30 in cash? Please explain. Thanks
asked by Henry 
science
I have to have three alternative ways to maximize food production in a developing country I am going to try and do Haiti They have had some major environment problem like soil erosion and deforestation I feel the food production can be helped if they had a
asked by Todd 
Poetry, part 2
Hopkin's use of "seared", "bleared", and "smearded" is an example of You are probably looking for a grammatical term....to which my mind is blank. But in poetry, rhythm usually sets the poem style, the use of seared, bleared, and smeared is the poetic
asked by bio 
HistoryArmenian Genocide
why is the Armenian genocide significant? can the international community prevent future genocide from happening? This site gives some excellent information. http://www.armeniangenocide.org/genocidefaq.html To consider the second part of the question, you
asked by Katrina 
Graphs
x + 2y = 4 How do I graph this?can you please help? Assign values to x and solve for y or assign values to y and solve for x. Makre a table. X........Y 0........2 2........3 etc. I almost always assign a value of zero to Y, too, and calculate X. Y = 0;
asked by Margie 
Graphs 2
x = 3 y = 2 how about this?how do i graph it? Is this a single point? no it says that Graph numbers 4 and 5 on the same square of graph paper. Make sure you label each line. x = 3 y = 2 Others may be able to answer this better than I; however, x = 3
asked by Margie 
MSDS sheet
Does anyone know where I can get a free MSDS sheet WITHOUT giving my complete biography? I don't mind an email address and even a name but land mail address, phone number, number of adults in household, cars in household, fax number, and other garbage is
asked by DrBob222 
Research Paper
I writing a paper on teenage driving should the age be 18? I need help on my methodology page What is a methodology page? I don't know if this helps but check on google The methodology is the method you will you to solve the problem. In this case, how you
asked by Shuntay 
Please HELP!!!!! I need to finish this by 12:30!!!
PLease Help!!My teacher is coming to pick this up at 12:30!!! Then don't waste your time pleading. Are you cheating on a test or something?
asked by Margie 
Slopes
Given y = 2x – 4, choose the statement that accurately describes this line. The slope is 2 and the y intercept is 4. The slope is 2 and the y intercept is 4. The slope is 4 and the y intercept is 2. The slope is 4 and they y intercept is 2. The
asked by Margie 
Slope
The slope of the line that passes through (2, 4) and (6, 2) is: 4/3 3/2 1/4 3/4 Remember, the slope is change in y divided by change in x, so, a slope of 3/2 for example, means that the line goes "up 3 and over 2"
asked by Margie 
graphs
x = 3 y = 2 how about this?how do i graph it? x = 3. This means, no matter what y is, x is 3. So, it's a vertical line at x = 3.
asked by Margie 
graphs2
x + 2y = 4 How do I graph this?can you please help? I answered this below. If you are having trouble you must tell us exactly what the problem is. What don't you understand about taking the next step? that is the problem.I got the other one but how do i
asked by Margie 
Algebra1
Complete this sentence with the correct choice: y = 4 is a horizontal line with ________. undefined slope. a slope of 4. a slope of 0. None of the above will make a true statement. Draw a line through y = 4 and parallel to the x axis. Now, what slope is
asked by Margie 
PLz!!!My teacher gave me 10 more min.so plz help!!
I really need help!! My advice is to spend some time reading our answers and less time pleading for more help. The time you take to type a plea for more help can be used for following our suggestions. DrBob222 is right. Graphing is very important, and we
asked by Margie 
Algebra
What would be the missing piece of information given the following information: Find the slope of the line that passes through the points (2, 6) and (4, 10). m = ? a. 2 b.6 c. 1 d. 9 I think it is c. Remeber the definition of a slope. It is the change in y
asked by Margie 
Algebra
What would be the missing piece of information given the following information: Find the slope of the line that passes through the points (2, 6) and (4, 10). m = ? a. 2 b.6 c. 1 d. 9 I think it is c. m = change in y over change in x m= (10  6)/(4  2)
asked by Margie 
Algebra ??
What would be the missing piece of information given the following information: Find the equation of the line that passes through the points (2, 6) and (4, 10). y = 2x + ? a. 4 b. 2 c. 7 d. 5 OK. let's take this step by step. y = 2x + ? Remember the
asked by Margie 
social studies
I need names of twenty famous people in world history, who are not americans. Here is web site that will not get 20 but will get close. The disadvantage is that all of them are from or lived in a small town AND it was years ago. You may want newer faces.
asked by marcus 
Algebra2?????
What would be the missing piece of information given the following information: Find the equation of the line that passes through the points (3, 1) and (2, 5). y = 6x + ? 17 15 20 11 Good. Try this one just like we did the last one...let me know how you
asked by Margie 
Please help with English!!!
Which one of the following sentences does not contain a serious verb error? 1. They staying there now. 2. She want a promotion. 3. If I was younger, I'd pursue another line of work. 4. We had sang that hymn last week. Cheryl, if you read those out loud,
asked by Cheryl 
Algebra3!!!!
How would you would graph the linear equation y = 2x + 6? First plot the point (6,0) and then count up two and to the right 1. First plot the point (6,0) and then count down two and to the right 1 First plot the point (0,6) and then count up two and to
asked by Margie 
ENGLISH HELP
Half the apples_________ on the floor, but some of them ________ on the table. are, are is is is are, are is We could neet the man who _________ all loans if the manager _________ here. approves, was approve, were approve, was approves, were Half the
asked by Kallie 
Algebra111111!!!
Choose the ordered pair that is a solution to the system of equations. x + y = 12 x + 2y = 3 a. (7, 5) b. (5, 7) c. (7, 5) d. (7, 5) e. none of the above This question wants you to find the point of intersection of the two lines, provided they're not
asked by Margie 
math
If you swim 2 miles in 40 minutes, what is the unit rate? If you use distance=rate*time, then rate =distance/time So 2mi/40min or simplifying to 1 mi per 20min Can you convert this to mile per hour?
asked by LIndsey 
Algebra22222!!!
Choose the ordered pair that is a solution to the system of equations. 3x  y = 10 x + y = 4 (3, 7) (1, 3) (3, 1) (3, 1) Follow the example I gave in your previous question. I'm not going to do all of them. You want to eliminate one of the variable
asked by Margie 
Algebra333333!!!
Choose the ordered pair that is a solution to the system of equations. 3x  y = 9 2x + y = 6 (3,0) (3,18) (3,1) (3,1) Once again add the two equations to get 5x = 15 Solve for x and substitute into either equation to find y.
asked by Margie 
To regular teachers
In trying to help Margie with algebra, it required intensive, stepbystep process. It would certainly be alot more efficient if there were a way to provide instant messaging in a situation like this. Is there a way via your site to communicate with
asked by DanH 
pigskin geography
Here is the question, The Wonders of American stamp series informs us the American bullfrog is the largest frog,and perhaps the loudest. Their bodies grow to what size?___inches. Their calls can be heard how far away ____miles. I got the answer to the
asked by Lanna 
HELP!!!!!! ENGLISH
We thought it was__________ should go. he whom him whom he who him who The supply of tablets (is, are) low. he who... (he should go, not him should go) The supply is low
asked by Kallie 
spanish
how do you say pool in spanish? piscina = pool charca is pool If you are talking about "pool" as the game... it is billar If you are talking about swimming pool, it is piscina piscina Thank you for using the Jiskha Homework Help Forum. First of all, it's
asked by Anonymous 
Linear Approximation
Use linear approximation, i.e. the tangent line, to approximate 1/0.104 as follows: Let f(x)=1/x and find the equation of the tangent line to f(x) at a "nice" point near 0.104 . Then use this to approximate 1/0.104 . L(x)=f(a)+f'(a)(xa)...i think. You're
asked by Jojo 
Calculus
How do I graph sin and cosin example: graph y=4sin(x + 3.14) Your function is the sin function shifted by pi units to the left. You need to study the sin function and know how to graph it. There should be a picture of it in your text, it's a very commonly
asked by Karen 
Calculus
How do you find Altitude and slope slope is the derivative of a function: for ex. if you have f(x)=x^2 + x, at point (1,2) f'(x)=2x+1 your slope is 2(1) + 1 = 3 =m to find the equation is yy1=m(xx1) so you have: y2=3(x1) gives you: 3x1 is your
asked by Karen 
english I NEED HELP AGAIN
Almost _________ work would be better than ___________. anyone's hers anyone's her's anyones hers anyones' hers' Anyone is singular and needs to show possession  so anyone's work. . . The next pronoun is also singular and possessive. But, hers shows
asked by Kallie 
english I NEED HELP AGAIN
Almost _________ work would be better than ___________. anyone's hers anyone's her's anyones hers anyones' hers' When a possessive noun is used, (mother's, sister's, anyone's) use an apostrophe. When a possessive pronoun is used, (hers, his, its) an
asked by Kallie 
Algebra 2345678!!
Solve the system of equations using the Addition method. 2a + 3b = 1 3a + 5b = 2 The addition method tells you to find common multiples of a coefficient, then add the equations together to eliminate a variable. If you multiply the first equation by 3 and
asked by Margie 
DanH I NEED ENGLISH HELP
Almost_________ work would be better than___________. anyone's hers anyone's her's anyones hers anyones' hers' Please check my previous answer.
asked by Kallie 
DanHAlgebra 1
Solve the system of equations using the Addition method. 2a + 3b = 1 3a + 5b = 2 Margie: Roger's answer below is correct. If you don't understand it, please try and tell us what you don't understand. He makes it sound so strange can you ask him to
asked by Margie 
Japanese
I am studying Japanese and I needed to know how to say these terms: 1.hello 2.bye 3.My name is.. 4.Lier 5.Shut Up!! Sorry it's just that today is my first day in Japanese class. Thank you for using the Jiskha Homework Help Forum. Here are the expressions
asked by Happy Halloween 
English
Hi, I was wondering if somebody could help me understand this writing prompt. I'm not sure If I'm supposed to talk about the characters' different points of view in some goals toward achieving sucess or if I'm supposed to tell what each characters' goals
asked by Isabel 
Government (Jury)
I was wondering why we have a jury system for courts? Please respond. http://www.19thcircuitcourt.state.il.us/bkshelf/resource/origin.htm =) Thanks.
asked by Patrick 
TLC error correction
Question: Consider the following errors that could be made when running TLC. Indicate what should be done to correct the error. A. A twocomponent mixture containing 1octene and 1,4dimethylbenzene gave only one spot with an Rf value of 0.95. The solvent
asked by Sheryl 
math  probability
Albino rats used to study the hormonal regulation of metabolic pathway are injected with a drug that inhibits body synthesis of protein. Usually, 4 out of 20 rats die from the drug before the experiment is over. a) If 10 animals are treated with the drug,
asked by Lindz 
MATH  probability #2
A rescue squad spokesperson claims that the squad receives an average of 3 calls per hour. If at most 6 calls were received over a 5hour period, would you suspect that the spokesperson was overestimating the average number of calls received per hour?
asked by Lindz 
Related Rates
Water is leaking out of an inverted conical tank at a rate of 500 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 10 meters and the diameter at the top is 4.5 meters. If the water
asked by Tom 
Accounting
What would the journal entry be for this transaction? sent a reminder to Gomez Co to pay the fee for services recorded on November 8 There would be no entry since a transaction did not take place.
asked by Anonymous 
science
what is the volume of 10 galons???? That's easy. It has a volume of 10 gallons. Do you want it converted to another unit?
asked by brandy 
physics
what site can i find physics formulas? http://muweb.millersville.edu/~jdooley/formulas/TOPLIST/TOPLIST.HTM
asked by miss sixty 
Sentence Grammar
Whats the error in these two sentences? After seeing the technique demonstrated on television, Janie baked homemakde bread for the first time yesterday, and her brother thought it tasted good, an opinion everyone agreed with. and Three hundred years ago
asked by Sigor 
Difference?
What is the difference between these two questions? They look the same to me, like they're asking the same thing. Not likely. Question: A student spots an unknown sample on a TLC plate and develops it in dichloromethane solvent. Only one spot, for which
asked by Sheryl 
math
i need to find facts on the number 4 What kind of facts? The number 4 immediately precedes the number 5 and is the first whole number after 3. Then you can make up a bunch of stuff using 4; i.e, 96 + 4 = 100 etc. If this is not the right direction, please
asked by aretha