Friday
April 18, 2014

Posts by Tc


Total # Posts: 39

Chemistry
thank you so much!

Chemistry
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!!

math
i have to solve this how I got y(3)+5y(2)-4y-20?

MATH
IT TOOK STACY 6 MINUTES TO COUNT TO 1,000. IF SHE CONTINUED COUNTING AT THE SAME RATE, HOW LONG WOULD IT TAKE HER TO COUNT TO 1,000,000?

math
a large stadium holds almost 100,000 people about how many times does the stadium have to filled for total attendance to reach one million?

chemistry
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.

Chemistry
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?

math
Huh

meters/cm^2
Yes

Math
Tbank you wats ur number sexy im gaylike that

Math
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.....

Physics
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?

MATH
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???

Math
If a teacher allows 5/6 of an hour to be spent on homework and she allow 1/3 of that time to be spent on math, how much time will be spent on math?

phys
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?

algebra
Find value of log (base 8)log (base 2) log (base 3)log (base 3) (27)^3 I endedup with 1.000063462 which was wrong

Chemistry
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 Activati...

Chemistry
thank u sooo much :D

Chemistry
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.

Chemistry
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 t...

Chemistry
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 o...

Chemistry
how much heat is needed to convert 966g of ice at -10 deg C to steam at 126 deg C

Chemistry
how many grams of each species will be present at the end when 0.500g of copper is added to 2.500g of AgNO3? Cu(s) + 2 AgNO3(aq) --> 2 Ag(s) + Cu(NO3)2 (aq)

chemistry
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

Chemistry
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

Chemistry
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!

chemistry
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?

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!

Econnomics
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 ...

economics
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 wel...

CHEMISTRY
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?

geography
why is the difference in solar receipt between 60N and 30N greater in the winter than in the summer?

Acc 280
Is posting and preparing the closing entries the same? If not how do you post the closing entries? Also what is a post closing trial balance?

English
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"?

English
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.&q...

pysics
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...

english
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

Math
A roof rises 8.5 ft over a horizontal distance of 18.02ft. what is the slope of the roof to the nearest hundredth?

egypt mummification
1 beeswax 2 animals 3 gold 4 imsety 5 osiris 6 natron 7 cartonnage 8 book of the dead 9 linen 10 amulets 11 hieroglyphs 12 shabtis

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