Saturday
December 27, 2014

# Posts by jake

Total # Posts: 1,791

Chemistry
Thank you very much. The molarity of the NaOH solution is 0.162. So I did the following: 25.00 mL NaOH*(1 L / 1000 mL)*(0.160 mol NaOH / 1 L NaOH)*(1 mol CH3COOH / 1 mol NaOH) = 0.004 mol CH3COOH (0.004 mol CH3COOH / 5.00 mL) * (1000 mL / 1 L) = 0.8 M CH3COOH Now I'm ...
March 4, 2009

Chemistry
Calculate the molar concentration of acetic acid (CH3COOH) in a 5.00-mL sample of vinegar (density is 1.00 g/mL) if it is titrated with 25.00 mL of NaOH.
March 4, 2009

Chemistry
Could someone please direct me to a website that explains why acid-base titration is a useful technique in chemistry. Or offer your own opinions. Thanks ahead of time for any input!
March 4, 2009

Chemistry
Acid-Base Titrations a) How will the concentration of NaOH be affected if during the titration some of the solid potassium hydrogen phthalate was spilled during the transfer? Will the concentration of the standardized NaOH increase, decrease, or have no effect? b) How will the...
March 3, 2009

Chemistry
No, this is not a duplicate. The other question refers to molarity. This one is asking for molar mass of an unknown acid. For this question would I do the following... Start with the volume of NaOH then convert it to moles with the answer from the first question. Use ...
March 2, 2009

Chemistry
Include an explanation, balanced chemical equation, units, significant figures and/or calculations where appropriate. Determination of the Molar Mass of an Unknown Acid Trial 1: 0.499 g unknown acid 24.07 mL NaOH Trial 2: 0.501 g unknown acid 23.71 mL NaOH Trial 3: 0.500 g ...
March 2, 2009

Chemistry
I'm not sure how to start it. I know I need to have a balanced chemical equation, so... KHC8H4O4 (aq) + NaOH (aq) --> H2O (l) + ???? Then once I figure this out, do I use the mass in each trial to find the moles of NaOH through stoichiometry. Then divide the number of ...
March 2, 2009

Chemistry
Include an explanation, balanced chemical equation, units, significant figures and/or calculations where appropriate. Standardization of NaOH Solution Trial 1: 0.501 g KHC8H4O4 15.22 mL NaOH Trial 2: 0.503 g KHC8H4O4 15.11 mL Trial 3: 0.500 g KHC8H4O4 15.10 mL Using the data ...
March 2, 2009

math
To write a decimal as a percent, just multiply it by 100. 0.3246 * 100 = 32.46%
March 2, 2009

Gen. Chemistry
A 0.887 g sample of a mixture of NaCl and KCl is dissolved in water and the solution is treated with an excess of AgNO3 producing 1.822 g of AgCl. What is the percent by mass of each component in the mixture?
March 2, 2009

calculus
Use integration by parts to evaluate the definite integral. Intergral: xsec^2(6x) dx I set u=sec^2(6x) and dv=x, but the problems seems to get harder as I go on.
February 27, 2009

5 / 10 = ? / 20 Multiply the denominator by 2 to get 20. Multiply the numerator by the same number (2) to get 10. Answer: 10 / 20
February 19, 2009

Chemistry
If 150 mL of 1.73 M aqueous NaI and 235 g of Pb(NO3)2 are reacted stoichiometrically according to the balanced equation, how many grams of Pb(NO3)2 remain? Pb(NO3)2(aq) + 2NaI(aq) → PbI2(s) + 2NaNO3(aq) Molar Mass (g/mol) NaI 149.89 Pb(NO3)2 331.21 Density (g/mL) - Molar...
February 19, 2009

Chemistry
What volume of 0.1209 M HCl is necessary to neutralize 0.5462 grams Ca(OH)2? Include a balanced chemical equation.
February 19, 2009

Chemistry
A 0.2861 gram sample of an unknown acid (HX) required 32.63 mL of 0.1045 M NaOH for neutralization to a phenolphthalein endpoint. What is the molar mass of the acid?
February 19, 2009

Chemistry
In a acid-base titration, 22.81 mL of an NaOH solution were required to neutralize 26.18 mL of a 0.1121 M HCl solution. What is the molarity of the NaOH solution?
February 19, 2009

Chemistry
I'm going over some post-laboratory questions for Conductivity of Solutions. One of the questions is... From your measurements, what can you say about a) the presence of ionic impurities in tap water? b) the presence of molecular impurities in tap water? I measured the ...
February 18, 2009

URGENT MATH help
(x^2y^6-3)^2 .....PLEASE HELP ME I HAVE NO IDEA HOW TO SOLVE THIS IVE BEEN DOING IT FOR HOURS
February 18, 2009

math
never mind what i figured that out but i cant seem to figure this out (x^2y^6-3)^2 .....thanks for your help i really need it
February 18, 2009

math
hi what is what is (x^-3)^2
February 18, 2009

math
What is (x^2y^6-3)^2
February 18, 2009

math
Is (5(x+1)/3) ....a simplified answer or is it (5x+5)/3 sorry i forgot the parenthesees so it might have looked confusing!
February 18, 2009

math
is 5(x+1)/3 ....a simplified answer or is it (5x+5)/3
February 18, 2009

math-fractions
I have to rewrite the fraction without an exponent, but I'm not for sure how to do the negative exponent. pls help! (3/2)^-2
February 16, 2009

AP Chem
A 0.23 M sodium chlorobenzoate (NaC7H4ClO2) solution has a pH of 8.68. Calculate the pH of a 0.23 M chlorobenzoic acid (HC7H4ClO2) solution
February 15, 2009

chemistry
Calculate the mass of the solid you must measure out to prepare 100 mL of 0.025 M CuSO4. Note that this salt is a hydrate, so its formula is CuSO4⋅5H2O. You must include the waters of hydration when calculating the formula weights. Would the following set-up yield the ...
February 11, 2009

english
what are some similarities between the stories Where are you going where have you been and the story Young Goodman Brown...as in similiar character or reoccuring themes? thank you so much :)
February 9, 2009

chemistry
Precipitation Reactions Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no reaction occurs, write NO REACTION. Express your answer as a chemical equation. Identify all of the phases in your answer. ...
February 9, 2009

math
the diameter of a small pizza is 16 centimeters. this is 2 cm more than 2/5 of the diameter of the large pizza so how big is the large pizza
February 5, 2009

Physics
wait wouldnt you add them because they are both going south
February 4, 2009

Chem Help .plz
First, You would set up the rate law equation. r=k[OH-]1[CLO2]2 Next, plug in the numbers you have already been given and have figured out r= 230 L2/M2xs [0.175]2 [.0844] Then you should get 5.94x10e-1 as your answer
February 3, 2009

Math
Simplify the exponential expression. Assume the variables represent nonzero real numbers. (2^-1 x^-5 y^-5)^-2 (2x^-2 y^4)^-2(4x^-2 y^4)^0 ______________________________________ (2x^-5 y^-5)^2 the line by the way means to divide. i have no idea how to solve :( All i know is the...
January 28, 2009

Algebra
Foam fingers sold for \$5. Spirit bracelets for \$4. You sold 40 more foam fingers than bracelets and earned \$965. Write a system of equations to describe this situation. Solve this system using as least 2 different methods. Explain each method.
January 26, 2009

algebra
Doesn't the line go on forever, so how could you choose 3 points above it?
January 26, 2009

algebra
Graph y=2x+1, then choose 3 points above the line. Give the coordinates of each point and tell wether it is greater than, less than or equal to 2x + 1 at each point.
January 26, 2009

English
Hi i am writing a response paper for "Cathedral" by Raymond Carver. Im not sure but is this a proper thesis statement. In the short story Cathedral, by Raymond Carver, a man refers to Robert as "this blind man." Not only is he categorizing Robert, but he&#...
January 26, 2009

English
Hi i am writing a response paper for "Cathedral" by Raymond Carver. Im not sure but is this a proper thesis statement. In the short story Cathedral, by Raymond Carver, a man refers to Robert as "this blind man." Not only is he categorizing Robert, but he&#...
January 26, 2009

philosophy
um this was are first day of philosophy, so i dont know anything you just said bobpursley , i'm just confused in general...im not sure if i talk about that humans are what make up earth, and they have different purposes in life to obtain and stuff like that not sure though...
January 21, 2009

philosophy
I have to write a 1 page paper "presenting what i believe the world is made of and explain why i believe that to be the case" and he said it doesn't deal with like water and land, so im not sure what he means, any help would be great.
January 21, 2009

college Chemistry
Ok this is the question... Complete the combustion of butane... CH3CH2CH2CH3 + O2 ====> ____________
January 21, 2009

sceince
1) which scientist's work did Copernicus contradict? 2) what made it difficult for him to prove his theory? i researched some site but still i dont get it...
January 11, 2009

science
1) which scientist was later imprisoned for openly supporting the Copernican theory? 2) what did he discover that helped prove that Copernicus was correct?
January 11, 2009

science
1) which scientist's work did Copernicus contradict? 2) what made it difficult for him to prove his theory?
January 11, 2009

Math
40 + 40 = 80 so 2 1/2
January 8, 2009

social studies
There are 32 people.
January 8, 2009

Algebra I
Stephen is walking from his house to his friend Sharon's house. When he is 12 blocks away, he looks at his watch. He looks again when he is 8 blocks away and finds that 6 minutes have passed. Write 2 ordered pairs for these data in the form (time, blocks). Write a linear ...
January 7, 2009

Algebra
Write the equation of a line in slope intercept form that contains (3/4, 1/2) and has the same slope as the line described by y + 3x = 6.
January 7, 2009

mathh help pleaseee (: ! <345
11. It is \$20 to start, every hike, you are charged \$2 more from the second company. If you divide 20 by 2, 10 will be even and at 11 it will be 2 \$ more.
January 7, 2009

chemistry
its 2/1000
January 5, 2009

Science - gr. 10 physics
How do you find displacement when given a velocity/time graph?
January 5, 2009

is this like a homework question or are you just wondering?? lol
January 5, 2009

chemistry
Do you mean 58g/mole?
January 5, 2009

math
January 5, 2009

Math-Gr.11 urgent
hi, i was wondering where you got: 20/2[2a + 19d] from, im in yr 11 but want to start revising a level because i want to get a phd in maths, so i just wanted to know where you got it from, if you could answer this, then thanks
January 4, 2009

biology
Because it can
December 17, 2008

History
Ok I know now that the answer is If they left England, they would be Separatists instead of Puritans, and that bothered them. thank you
December 10, 2008

History
Ok the first one is B? The reason I was confused on it was because that all 3 of them could work. I just didn't know which one was best I guess. And with the other question, I'm still not sure but I think it was fear of Mohawk Revolt?
December 10, 2008

History
Well I didn't just copy and paste those even if it might look like it. And I only asked 2 questions. Anyway for the first one I am currently thinking that it is probably A or C? Tuxedo's aren't a necessity, yet they are a nice contribution, and the bravery that C ...
December 10, 2008

History
If someone says that Pilgrims didn't do much for us, what should we say to them? A. Tuxedos were invented because of those black and white outfits the Pilgrims wore. B.That Mayflower Compact they made was the first constitution ever written in North America, and it was ...
December 10, 2008

english
December 7, 2008

english
thank you, also i have to be able to sympathsize with the other side, but last time i wrote an essay and did that for this class, it sounded like i was for both sides. how do i make it so that i can strongly agree with 1 side, but also can understand where people are coming ...
December 7, 2008

english
im writing a research essay about the legalization of drugs are there any good websites you have for this topic? Also i have to say which side i take without saying the other side is wrong, and dont know how to make this paper sound too general.
December 7, 2008

accounting
If i have \$550.00 a week.how much is the state deductions in the state of california for one week?
December 7, 2008

Chemistry
Given: H3PO4(aq) + 3 NaOH(aq) yields 3 H2O(l) + Na3PO4(aq) change in H = -166.5 kJ What is the value for q (heat) if 4.00 g of NaOH reacts with an excess of H3PO4? Please can you explain to me HOW to do this, not just give me an answer? Thanks!
November 30, 2008

Chemistry
Given: H3PO4(aq) + 3 NaOH(aq) ¨ 3 H2O(l) + Na3PO4(aq) ƒ¢H = -166.5 kJ What is the value for q (heat) if 4.00 g of NaOH reacts with an excess of H3PO4? Please can you explain to me HOW to do this, not just give me an answer? Thanks!
November 30, 2008

Science
True/False - A generator that doubles the electrical energy from a wall outlet without any additional input of energy will work. - The total amount of energy in the universe is constant. thank you
November 21, 2008

organic
a peptide contains amino acids Phe,Gly Met,Ala, and Ser. N-terminal analysis yielded the PTH derivative of alanine. Partial hydrolysis of the petapeptide yielded the dipeptides Gly-Ser, Ala-Gly, and Ser-Met. The peptide sequence is what? Ala-Gly-Ser-Phe-Met Ala-Gly-Ser-Met-Phe...
November 20, 2008

organic
alpha-amino
November 20, 2008

organic
which is false about naturally occurring a-amino acids? they belong to the D family of chiral compounds related to D-glyceraldehyde all are chiral except for glycine each has a characteristic isoelectric point the ph at which there is no net migration of the amino acid toward ...
November 20, 2008

organic
what is the best synthesis of 2-heptanol CH3CH2CH2MgBr(2 moles)+formaldehyde in diethyl ether followed by H3O+ CH3CH2CH2MgBr+butanal in diethyl ether followed by H3O+ CH3CH2CH2CH2MgBr+acetone in diethyl ether followed by H3O+ CH3CH2CH2CH2CH2MgBr+ethanal in diethyl ether ...
November 20, 2008

organic
what is the best synthesis of 4-heptanol (CH3CH2CH2)2CHOH CH3CH2CH2MgBr (2 moles)+formaldehyde (CH2=O) in diethyl ether followed by H3O+ (CH3CH2CH2)2ChMgBr+formaldehyde (CH2=O) in diethyl ether followed by H3O+ CH3CH2CH2MgBr+butanal (CH3CH2CH2CH=O) in diethyl ether followed ...
November 20, 2008

english
Which of the craftsmen is in charge of the rehearsals?
November 17, 2008

math
how do you square numbers when your typing?
November 15, 2008

AP Chemistry!!!!
For our test in a few days, we heard that there was something for pi and sigma bonds overlapping...can someone explain to me the "hybridizaiton" of where they overlap?? I dont understand it.
November 11, 2008

maths
Find the roots of z^6 + 1 and hence resolve z^6 + 1into read quadratic factors; deduce that cos3x = 4[cos(x) -cos(pi/6)][(cos(x) -cos(pi/2)][(cos(x) -cos(5pi/6)]
November 10, 2008

maths
Find the roots of z^6 + 1 and hence resolve z^6 + 1into read quadratic factors; deduce that cos3x = 4[cos(x) -cos(pi/6)][(cos(x) -cos(pi/2)][(cos(x) -cos(5pi/6)]
November 10, 2008

organic
Explain why glucose undergoes mutarotation
November 8, 2008

Organic
Are any of the following a tertiary amine 2-methyl-2-butanamine N-Methyl-1-butanamine N-Methyl-2-butanamine
November 8, 2008

chemistry
C6H5NO2+? = C6H5N2Cl
November 8, 2008

chemistry
The reaction of sec-butylmagnesium bromide with formaldehyde followed by hydrolysis yields? 2,2-dimethyl-1-pentanol 2-butanol 2-methyl-1-butanol 2-pentanol 2,2-dimethyl-1-propanol
November 8, 2008

chemistry
what is the best combination for preparing CH3CH2CH2CH2OCH3 is CH3CH2CH2CH2OH+NaOCH3 CH3CH2CH2CH2ONa+NaOCH3 CH3CH2CH2CH2Br+NaOCH3 CH3CH2CH2CH2Br+CH3Br
November 8, 2008

organic
which phenol is the most acidic? phenol 2-methyl-6-nitrophenol 3-methyl-5-nitrophenol 2,6-dimethyl-3-nitrophenol 2,4,6-trimethylphenol
November 8, 2008

chemistry
what is the best synthesis of 2-methyl-2-pentene (CH3)2C=CHCH2CH3? 1.(CH3)2CHCH2CH2CH3+F2,heat 2. KOC(CH3)2 1.(CH3)2CHCH2CH2CH3+Cl2,heat2.NaOCH2CH3 1.(CH3)2CHCH2CH2CH3+Br2,heat2.NaOCH3 1.(CH3)2CHCh2CH2CH3+I2,heat2.NaOCH2CH3
November 8, 2008

o chem
Which is not correct? glucose is a reducing sugar glucose has six carbon atoms glucose undergoes mutarotation glucose is a disaccharide glucose is an aldose
November 7, 2008

o chem
a-D-glucose and b-d-glucose can best be described as? -diasteromers -constitutional isomers -different conformations -enantiomers -keto-enol isomers
November 7, 2008

November 6, 2008

math
estimate quotient and divide (how do you estimate the quotient? 552 divided by 71,520 I dont understand the steps.
November 6, 2008

science
why is mitosis important?
November 2, 2008

Are you trying to say this disproves the Associative property? because the associative property is only if the operation contains all and ONLY addition signs or all and ONLY multiplication signs. Not if it contains both.
October 17, 2008

Math
Using only addition and subtraction, without changing the order of the digits, and having just three operations, form an equation out of 123456789 that equals 100.
October 14, 2008

Science
What bird is considered a sign of the coming spring?
October 4, 2008

He is doing a book report. (Old school.) LOL
October 4, 2008

nonfiction
just took test 100 answers are crrect
October 1, 2008

well if you're trying to find the difference: 20 - (-10) = 20 + 10. So the difference is 30. You can just add it's opposite. Ex. -30 - -20. That = -30 + 20. therefore the answer is -10.
September 22, 2008

science plzzz help
Mass vs. Weight: Although the terms mass and weight are used almost interchangeably, there is a difference between them. Mass is a measure of the quantity of matter, which is constant all over the universe. Weight is proportional to mass but depends on location in the universe...
September 21, 2008

science plzzz help
I'm not entirely sure but I think the main difference is that mass is used in relation to the metric system (metric syst. is used universally in compiling data from scientific findings)and I think weight is used in the customary system. LOL! All I remember is our Chem ...
September 21, 2008

Math
i can't find these patterns. my mom and dad tried to. first problem 64,__,___,___,32 second problems 61,___, ___, ___, 81
September 18, 2008

Algebra
a+6a-9=30
September 17, 2008

Math
How do you solve the following equation x2 - 5x = 14 x2 - 5 x - 14 = 0 (x - 7) (x + 2) = 0 x = 7 or x = -2 How do I explain this to my son who was not taught this way???
September 9, 2008

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