Posts by Tc
Total # Posts: 45
Blood type AB is found in only 3% of the population. If 240 people are chosen at random, find the probability of the following. (Round your answers to four decimal places.) (a) 5 or more will have this blood type (b)between 5 an 10 will have this blood type
July 5, 2014
I was just wondering how I would determine the pKb of a weak base that was titrated with a strong acid on a titration curve at the EQUIVALENCE POINT. And from this, how would I find the pH? PLEASE HELP!!
March 28, 2013
Math Ms. Sue please
She had gone by the rules and posted her questions and answers to them, if she just gave questions and asked for only answers well then that's another story but to say that she is a cheater for asking someone to check her answers (which were all correct) that is just very ...
March 20, 2013
Ni(II) coordination compound in an octahedral arrangement. Determine exact formula of compound. Info given: 4.37x10-4 moles of complex in 425 mL of water. You find that 17.49 mL of .1000 M HCl is need to titrate.
May 8, 2012
I took 25 mL of an unknown weak acid and added it to 10 mL of NaOH solution. I measured the pH and got 2.88 with concentration of NaOH @ .0098 and weak acid at 0.0102. What is pKa for the acid?
May 5, 2012
for my stats exam, we are NOT allowed to use a scientific or graphing cal, my professor will give us those cheap calculator from the 99cent store. I wanted to know how can i calculate e^-4.7? on my scientific it says it0.009095 but on my cheap calculator.. here is what i did...
February 28, 2012
Givent the initial velocity of the car, the driver's reaction time, and the coefficient of friction,find the total distance required far a car to stop. <------ What is the formula that I need to solve this?
February 23, 2012
How can I find the vertex, axis of symmetry? I know to find x and y intercepts i use the quadratic formula. I am given the parabola y=x^2+6x+5 I do not want the answer.. Just please explain to me how to solve for it. what method do I use???
January 26, 2012
Doug pushes a 4.65 kg crate up a 2.00 m high 13.0° frictionless slope by pushing it with a constant horizontal force of 35.8 N. What is the speed (in m/s) of the crate as it reaches the top of the slope assuming that the local acceleration due to gravity is -9.80 m/s2?
November 9, 2011
Temperature Rate Constant 310 0.830 320 2.27 330 5.83 340 14.2 350 32.8 Use an Arrhenius plot to determine the frequency factor for the reaction. I know the equation to find the frequency factor is K= Ae^-Ea/RT but i am still getting the wrong answer. Do I convert the ...
September 19, 2011
Choose the bond that is the weakest: A) Na-Cl B) I-I C) C=N D) Li-F E) C=O I don't understand the question... do they mean polarity wise, IMF wise or bond length wise. I know the answer is C but why C.
July 3, 2011
Arrange the compounds in order of increasing boiling point. A) CH4 B)CH3CH3 C) CH3CH2Cl D) CH3CH2OH **I know High Intermolecular force = High boiling point!** My question is if A, B & C are dipole-dipole, and D is hydrogen bonding.. how can i determine from A, B & C which is ...
July 2, 2011
Need help with my lab report for specific heat of unknown metal! I need to Find the Specific Heat of Al! I know its Q= M x Cs x Change in Temp I am getting a such a high number am just confused if its right. Here is what I got in Lab: Aluminum Mass of Metal (Mm): 6.128g Mass ...
June 24, 2011
Create a reaction: Na3PO4 + 3 KOH --> NaOH + K3PO4 You have 25 moles of Na3PO4.....you NEED KOH 25 moles Na3PO4 x 3 mol KOH/1 mol Na3PO4 = 75 mol KOH Convert from MOl to GRAMS 75 mol KOH x 56.106g KOH/ 1 mol KOH
May 6, 2011
Thank you for your help :) but the correct answer according to my prof was 32.8mL i am not even sure if C is the correct answer or a typo. I was give 5 options to choose from: a) concentration can not change because of evaporation b) 100.0 mL c) 32.8 mL d) 67.2 mL e) 12.2 mL
May 5, 2011
You have 100.0 mL of 0.2500 M solution of NaCl sitting in a beaker. After several days you test the solution and find out that it is now 0.3721M. How much water must have evaporated?? I got 67.2 mL but its the wrong answer.. PLS HELP!
May 5, 2011
a 2.500g sample of an unknown compound containing only C, H and O was burned in O2. The products were 4.776g of CO2 and 2.934g of H2O. a) what is the percent compostion of the original compound? %C- %H- %O and what is empirical formual of compound?
March 16, 2011
Intro to chemistry
Determine the volume of 2.3 M H3PO4 that can completely react with? 340 mLs of a 5.1 M solution of NaOH according to the reaction: 3 NaOH + H3PO4 --> Na3PO4 + 3 H2O stuck on a homework problem..pls help!
November 15, 2010
The New York Times cost $0.15 in 1970 and $0.75 in 2000. The average wage in manufacturing was $3.23 per hour in 1970 and $14.32 in 2000. a. By what percentage did the price of a newspaper rise? b. By what percentage did the wage rise? c. In each year, how many minutes does a ...
November 11, 2010
The participation of women in the U.S. labor force has risen dramatically since 1970. a. How do you think this rise affected GDP? b. Now imagine a measure of well-being that includes time spent working in the home and taking leisure. How would the change in this measure of ...
November 11, 2010
suppose a 1-m(power3) sample of air at sea-level pressure, containing 4 g of water vapor, was cooled and condensation occurred. how many calories of heat would be released by this process?
October 19, 2010
I put the quotations in because the sentence was from a article...Would the independent cluase be "Chuck Tompkins/said" ,"Brancheas/was" ,"whale/grabbed" and "whale/pulled"? And the dependent be "Associated Press reported"?
February 27, 2010
What is the independent clause and dependent clause of the following : "However, Chuck Tompkins, head of animal training at all SeaWorld parks, said Brancheau was rubbing the whale after a show when the whale grabbed her and pulled her in, the Associated Press reported.&...
February 27, 2010
A 900 kg car rolling on a horizontal surface has speed v = 60 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.2 m. What is the spring stiffness constant of the spring? I solved this and i had 25826.44629, but i am being told i am wrong...
October 12, 2009
show me a letter to an editor of your local newspaper opposing the veiw expressed by one of its journalists that the popular music of your country is full of sound and fury meaning nothing
October 27, 2008