Thursday
November 26, 2015

# Posts by ellen

Total # Posts: 193

chemistry
I can't figure out how to get the initial pH. Also, when I tried part B I used 21.0 mL*.100M=XmL*0.130 and it wasn't the correct answer.
July 29, 2010

chemistry
Consider the titration of 21.0 mL sample of 0.110 M HC2H3O2 with 0.130 M NaOH. what is the initial pH? what is the volume of added base required to reach equivalance point? what is the pH at 5.00 mL of added base? pH at one half o the equivalence point? pH at the equivalence ...
July 29, 2010

chemistry
Calculate the pH of the solution that results from the mixture. 170 mL of 0.12 M C2H5NH2 with 285.0 mL of 0.22 M C2H5NH3Cl.
July 28, 2010

chemistry
what is the pH of 0.15 M NaF?
July 28, 2010

chemistry
If 5.05mL of 0.1000 M NaOH solution is needed to just neutralize excess acid after 20.00 mL of HCl was added to 1.00 g of an antacid, how many moles of acid can the antacid counteract per gram?
July 27, 2010

chemistry
If 5.00 mL of HCl require 4.03 mL of 0.9581 M NaOH to just consume the HCl, what is the concentration of the HCl?
July 25, 2010

chemistry
need help with these problems: The concentration of glucose in blood is usually about 0.10% (w/v). If 7.0 L of blood are in an average man, how many grams of glucose are in his blood? To obtain the solute for 118 g of a 19.2% (w/w) solution of sugar we would weigh out ________...
July 20, 2010

chemistry
need help setting this problem up: The heat of fusion of water is 335 J/g. How much heat would be required to melt 10.4 g of ice?
July 20, 2010

Chemistry
The following reaction was monitored as a function of time: AB--->A+B A plot of 1/[AB] versus time yields a straight line with slope 5.2×10−2 . If the initial concentration of is 0.240M , and the reaction mixture initially contains no products, what are the ...
July 18, 2010

chemistry
The following reaction was monitored as a function of time: AB--->A +B A plot of 1/[AB] versus time yields a straight line with slope 5.2 x 10^-2 M*s. What is the value of the rate constant (k) for this reaction at this temperature?
July 17, 2010

ch102
The rate constant of a reaction at 30 was measured to be 5.7×10^-2. If the frequency factor is 1.2 x10^13 /s what is the activation barrier?
July 16, 2010

CH102
nevermind! figured it out
July 16, 2010

CH102
If a temperature increase from 18.0 to 34.0 triples the rate constant for a reaction, what is the value of the activation barrier for the reaction?
July 16, 2010

Chemistry
i tried that but it says its wrong
April 16, 2010

Chemistry
An air sample contains 0.038% CO2. If the total pressure is 764 mm Hg , what is the partial pressure of CO2?
April 16, 2010

Physics
thank you so so so much. the answer is .3626
March 24, 2010

Physics
A hollow plastic spherical bobber of mass 0.005 kg and volume of 50 cm3 floats on the surface of a lake supporting a submersed fishhook and a bait with a combined mass of 0.01 kg and a combined volume of 2 cm3. The density of water is 0.001 kg/cm3. If a fish grabs the bait, ...
March 24, 2010

ENVIRONMENTAL SCIENCE
A viewpoint expressed in the video material emphasizes the idea that every type of species has its meaning and purpose, and is important part of biodiversity. Unique characteristics of different species contain the secret of harmony in the world, benefiting from each other by ...
January 19, 2010

Algebra/story problem
Can someone help me work this problem please? The equation y= -1777x+27,153 can be used to predict the number of gun deaths in the United States x years after 2000, that is x=0 corresponds to 2000, x=2 corresponds to 2002, x=4 corresponds to 2004, and so on. Predict the number...
January 7, 2010

Marketing
What arguments can you make against the common assumption that marketers only worry about advertising?
December 1, 2009

General Physics
A 0.40 - kg object connected to light spring with a force constant of 19.6 N/m oscillates on a frictionless horizontal surface. If the spring is released from rest, determine the maximum speed of the object.
November 12, 2009

math
when y=-sinx and y=sin2x - sinx are added together and graphed, why do the maximum values of two sin functions occur where they do?
October 13, 2009

Chopsticks
3x^2-8x+1=0
August 31, 2009

literary
I am writing my father's obituary - he passed away unexpectedly on Monday. He was from a very small town and always quoted verse that ended with "And when I go (return) home, I am a boy again" Walt Whitman. Dylan Thomas. Please. Please. I have a deadline tomorrow...
June 24, 2009

algebra
Graph the equation using the slope and the y- intercept y= 8/5x+5
June 7, 2009

7th pre-algebra
I need help understanding how to slove two step equations. Example -10 - k=-36
May 11, 2009

math
This is incorrect
April 9, 2009

art -year8-writeacher
thankyou for finding those websites for me they are a great help. i looked at those myself but i wasn`t sure if they were right. thanks again!
April 3, 2009

art -year8
i need to design a renaissance outfit for art. please could someone help me find some websites that show some outfits that can help me. thankyou.
April 3, 2009

Orientalism
What are the three aspects of Orientalism
March 25, 2009

Reiny! Reiny! Reiny!
1. Oanh walked from her home to the grocery store at 3 mi/h and jogged home at 6 mi/h. Her total round trip was 15 minutes (1/4h). How far from Oanh's home is the grocery store? (use an equation to solve this) Help, I am totally clueless on this.
February 5, 2009

PLEASE HELP ME!
Rewrite each polynomial as the product of two binomials. 1. y^2 + 6y + 9 2. 25x^2 - 10x + 1 3. 36 - y^2 I don't understand how to do these problems, especially what the direction is telling me to do. Someone help me please?
January 16, 2009

Algerba 1
Rewrite each polynomial as the product of two binomials. 1. y^2 + 6y + 9 2. 25x^2 - 10x + 1 3. 36 - y^2 I don't understand how to do these problems, especially what the direction is telling me to do. Someone help me please?
January 16, 2009

Chemistry
Thank you for helping me with this.
December 16, 2008

Chemistry
We did a flame testing lab today with the following metal ions: Sodium, Na^+1 Barium, Ba ^2+ Calcium, Ca ^2+ Copper, Cu ^2+ Potassium, K ^+1 Strontium, Sr ^2+ Lithium, Li ^+1 The question asks to explain the effect of the nitrate ion solution on the color emission. Please help...
December 16, 2008

algebra
yes. thank you very much
December 1, 2008

algebra
how would you go about solving this problem? a x 2b/6 x 4/5a
December 1, 2008

algebra
so would i do this: 82.1 - 86 = -3.9 now that i have the -3.9 would that be the final answer to the question "what is the deviation from the mean that day?"
November 9, 2008

algebra
so would i do this: 82.1 - 86 = -3.9 now that i have the -3.9 would that be the final answer to the question "what is the deviation from the mean that day?"
November 9, 2008

algebra
How would i go about answereing this question? The mean temperature in new york one summer was 86 degrees. if the temperature on july 22 of that summer was 82.1 degrees, what was the deviation from the mean that day?
November 9, 2008

math
How would i go about answereing this question? The mean temperature in new york one summer was 86 degrees. if the temperature on july 22 of that summer was 82.1 degrees, what was the deviation from the mean that day?
November 9, 2008

Writing
thanks, do you have any ideas that interest you that would be about 3,000 words
November 8, 2008

Writing
thank you very much. my main interest was the white house. do you have any topics with why question that i could do for that??
November 8, 2008

Writing
i have to do a research paper for journalism class. It has to be something that has to do with washington, d.c. but the topic cant be too generalo. it has to be something specific that i will be able to write 1,500 to 3,00 words. Also, the topic has to answer a "WHY"...
November 8, 2008

physics
A pendulum consists of an object of mass 1.07 kg that hangs at the end of a massless bar, a distance 1.14 m from the pivot point. Calculate the magnitude of the torque due to gravity about the pivot point if the bar makes an angle of 22° with the vertical.
October 9, 2008

physics
A 4422.0 kg truck is parked on a 10.8° slope. What is the friction force on the truck?
October 9, 2008

physics
A woman has a mass of 64.2 kg. What is her weight on earth?
October 9, 2008

Algebra
Solve sytems of equations for 7x-3y=31 and y-5=3x I need to find what x and y equal. thanks!
April 20, 2008

Algebra
Explicitly explain how to tell an answer is correct when solvingi systems of equations. -thanks so much!
April 3, 2008

math
find distance from (-4,2) to (5,14)
March 23, 2008

Physical Science
If you poked 3 holes in a vertical line in a bottle filled with water, which hole will spurt water the furthest? Why? -thanks so much for your help!
March 17, 2008

finance and accounting
Account Word Problems like this I seem not to get the concept , please give me an exam as how to figure out this problem. 1. The liabilities of Acosta Corporation equal one-third of the total assets. And stockholders equity is \$160,000. What is the amount of the liabilities. ...
March 4, 2008

finance and accounting
Account Word Problems like this I seem not to get the concept , please give me an exam as how to figure out this problem. 1. The liabilities of Acosta Corporation equal one-third of the total assets. And stockholders equity is \$160,000. What is the amount of the liabilities. ...
March 3, 2008

Science
How does the ozone effect the wind patterns
January 22, 2008

US history
Hi! i am wondering if you can explain amendmant 7 in more depth. Thanks!
January 19, 2008

Algebra
What is the differance between a discrete graph and a continuous graph? Thanks so much!
January 16, 2008

Pre
A) List two examples of pairs of numbers that share a common factor. B) List a variable pair with a common factor. C) Why do u think ab+ac is called "simplified form"? I don't really what they are asking me to do... ummmm, anyone help me?
January 7, 2008

Just Wondering
Whats Christmas anyways? Like, how did it become a true holiday? What is the story behind it?
December 24, 2007

Math
You were busy working on a problem using 4 big squares, 8 rectangles, and 8 small squares. Your partner accidentally knocked some algebra tiles off the your desk. You now have 1 big square, 3 rectangles, and 5 small squares on your desk. Write and algebraic equation that shows...
December 10, 2007

Pre-Algebra
You were busy working on a problem using 4 big squares, 8 rectangles, and 8 small squares. Your partner accidentally knocked some algebra tiles off the your desk. You now have 1 big square, 3 rectangles, and 5 small squares on your desk. Write and algebraic equation that shows...
December 10, 2007

Pre-Algebra
You were busy working on a problem using 4 big squares, 8 rectangles, and 8 small squares. Your partner accidentally knocked some algebra tiles off the your desk. You now have 1 big square, 3 rectangles, and 5 small squares on your desk. Write and algebraic equation that shows...
December 10, 2007

French
so, how do u really say this quote in french? "You are in love when suddenly reality is in your dreams, and you cannot sleep anymore." help?
December 4, 2007

Pre-Algebra
What does P-E-M-D-A-S mean? I know they are the orders of operation, but I forgot what each letter stand for??? HELP!
November 28, 2007

Pre-Algebra
Thank you!
November 28, 2007

Pre-Algebra
okay so the decimal is 0.001 and I need to convert it to a fraction and a precent? how do I do that??
November 28, 2007

Pre-Algebra please help me!!
OMG! thank you sooo much! genius! it works by the way!!!
November 26, 2007

Pre-Algebra please help me!!
X- 0 1 2 3 4 5 6 Y- -7 -4 -1 2 5 8 11 this is a x and y table I need to find out wat the rule is to get y. So the equation would start out like: Y=?????? wat do u need to do with x to get y? and I need help badly! so please!
November 26, 2007

algebra
(p+3)(p-4)(p-3)(p+4)
November 25, 2007

algebra
consider three consecutive even intergers, the least of which is x. Write a polnomial representing the product of these three intergers.(p+3)(p-4)(p-3)(p+4)
November 25, 2007

math
1/4 think money like 25 cents
November 12, 2007

Social Studies
Name 3 documents and or important people involving the government? For example: as one of the documents, The Articles of Confederation can be one. Can anyone name 2 more at least??? PLZ!
November 12, 2007

Pre-Algebra
So since 2/3 of Spinner 1 is sedans (The 3rd is a truck), and 1/2 of Spinner 2 is purple (the other half is a green), write a multipilcation problem to describe the probability of spinning a purple sedan. Write a problem to describe the probability of spinning a purple truck. ...
November 8, 2007

Pre-Algebra
So since 2/3 of Spinner 1 is sedans (The 3rd is a truck), and 1/2 of Spinner 2 is purple (the other half is a green), write a multipilcation problem to describe the probability of spinning a purple sedan. Write a problem to describe the probability of spinning a purple truck. ...
November 8, 2007

math
dwrs can you show your work? Can figure out who you got the 3?
October 29, 2007

math
Sorry the question didn't come out right. It was supposed to read. 9k + 6 is < or equal to 39.
October 29, 2007

Math
drwls can you show your work?
October 29, 2007

Math
9k+6<39 -
October 29, 2007

Social Studies
What are some interesting facts about the uniforms in the Revolutionary War?
October 17, 2007

Pre-Algebra
If negative 20 equals 168, negative 15 equals 153, negative 10 equals 138, negative 5 equals 123, 0 equals 108, 5 equals 93, 10 equals 78, 15 equals 63, 20 equals 48, then what is the rule??? Tables: X: -20 -15 -10 -5 0 5 10 15 20 Y: 168 153 138 123 108 93 78 63 48 How do I ...
October 8, 2007

Pre-Algebra
I mean like the equaled number is the y and the negative or positive numbers are the x...wat do I do with X to get to y???
October 8, 2007

Pre-Algebra
If negative 20 equals 168, negative 15 equals 153, negative 10 equals 138, negative 5 equals 123, 0 equals 108, 5 equals 93, 10 equals 78, 15 equals 63, 20 equals 48, then what is the rule??? Also, what is the pattern in the informatio above???
October 8, 2007

Social Studies: The Revolutionary War
What did the First Continental Congress achieve?
October 7, 2007

Social Studies: The Revolutionary War
How did the fighting at Lexington and Concord affect the relationship between the colonies and the Great Britain?
October 7, 2007

Science
What does Endoplasmic Reticulum means or is?
October 6, 2007

Pre-Algebra
in- 0 1 2 3 4 X out- 1 4 10 0's output is 1 and 1's output is 4, then 3's output is 10....wat is the rule to this??? and wat are the outputs for 2, and 4?
October 6, 2007

Pre-Algebra
in- 0 1 2 3 4 X out- 1 4 10 0's output is 1 and 1's output is 4, then 3's output is 10....wat is the rule to this??? and wat are the outputs for 2, and 4?
October 6, 2007

English
I need help with this question: replace the underlined nouns in this paragraph with personal pronouns.Write the pronouns on the lines below. The nouns have a number right next to them for you to read. Here is the paragraph: Squanto was a Pawtuxet Indian man who came to the aid...
September 28, 2007

math
The difference of two numbers is 9. The sum of 3 times the greater number and 4 more than the lesser number is 51. What are the two numbers? I do not get this question... I have tried many times, but can not get it.. please help! thank you.
September 20, 2007

Math
7th grade--how do I determine the slope of a set of stairs? Thanks you find it by measuring thr rise over the run i.e. the vertical distance divided by the horizontal distance. thanks
May 7, 2007

Pre-Calculus
How would you graph y= x^3 +1? I know the slope for the equation is y'= 3X^2. assign numbers to x and solve for y to get the poins. Then graph. Examples: x=1 then y=2 if x=0 then y=1 if x=2 then y=9
November 13, 2006

economic - emergency
Question concerning production function - Cobb douglas. Given is: y=(0,2K-1 + 0,8L-1)-1 If wk = wL =1, what will k and L be? Now suppose again: y=(0,2k-1 + 0,8L-1)-1 and z=K1/3*L2/3. Is product y or z always more demanding to capitals (in case of labour)? if not, find where % ...
September 27, 2006

ETH 125
OMG this is FREAKING hilarious!!!!!!! Ethics 125 here as well, looking for other ways to measure prejudice! HAHAHAHAHAHAHAHAHAHAHAHAHAH
July 20, 2006

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