Posts by andrew

Total # Posts: 1,195

Chemistry
So since the vapor pressure of water is 23.8 torr p = 0.99 * 23.8 p = 23.6 is this right?

Chemistry
What is the total vapor pressure of NaCl solution at 25C with mole fraction of 0.01? (X_NaCl = 0.01) Thanks!!

Math
what dose sea level mean in math :()!

chemistry
Between HF and H2O, which one has the greater intermolecular force? i know they both exhibit hydrogen-bonding, but which one is greater? thanks

Biochemistry
Assuming pKa values of 3.8 for the a-COOH and 8.5 for the a-amino groups and that the numbers in parentheses indicate the pKa values of side chain groups, at what pH would electrophoresis provide the best resolution of the following dipeptides? His (6.0) – Ser Gly – ...

Dr Bob
On preparation of a solution of protein, you attempted to dissolve the substance in water, but a suspension resulted. Drop-wise adition of NaOH solution, with stirring, eliminated the suspension. Addition of acid to the original suspension had no effect. Think about how pH ...

Biochemistry
I have a 1/40 dilution as 19.18 mg/ml. how would i get back to the original solution?

Biochemistry
So with NaOH... it's a strong base... it denatured the protein so it eliminated the suspension? Adding acid to the original suspension didn't do anything because it didn't denature the protein? In strong acid, the protein is exposed to the strong acid and the ...

Biochemistry
On preparation of a solution of protein, you attempted to dissolve the substance in water, but a suspension resulted. Drop-wise adition of NaOH solution, with stirring, eliminated the suspension. Addition of acid to the original suspension had no effect. Think about how pH ...

DrBob
How would i explain the readiness of allyl alcohol to react with the Lucas test???? Thanks!! ------------------- I still don't understand-- I know Lucas Test is best for tert carbocations but 2-propen-1-ol gives secondary carbocation at best even with rearrangement? Is ...

Chemistry
How would i explain the readiness of allyl alcohol to react with the Lucas test???? Thanks!!

8th grade pre algebra
Assign a value to t as long as that value keeps the statement true, then it is correct. t in this would be anything greater than -9 to solve it it would look like: t+6>-3 -6 -6 t>-9

Biochemistry
Thank you, I understand all of it but I'm not sure how I'm supposed to know what the pKa is

Biochemistry
Calculate the pH that would result if 0.40mL of 1.50 M HCl is added to 12.0 mL of a 0.065 M solution of the fully deprotonated form of the tripeptide glu-asn-leu. I know I'm supposed to do an ICE table... and the equation will look like this initially: deprotonated + HCl...

Math 30 Pure
Shouldn't it equal zero anyway because what does Y equal?

Titration
Which of the four solutions (all same concetrations, same volume) requires: a) the greatest amount of base for complete titration? b) the greatest amount of base to titrate to any given pH? HCl, acetic acid, formic acid, HNO3. i put HCl for both... is that correct?

Dr Bob
What is the pH of the solution that results from mixing 5 ml of 0.2 M NaOH and 100 mL of 0.05 M lactic acid? (Pka of lactic acid= 3.86) Responses Use the Henderson-Hasselbalch equation. The mixture you have indicated will react to form a buffer, the base will be the sodium ...

Biochemistry
What is the pH of the solution that results from mixing 5 ml of 0.2 M NaOH and 100 mL of 0.05 M lactic acid? (Pka of lactic acid= 3.86)

math
oh i see thank you

math
you and a friend are collecting leaves.In your collection of 45 leaves, 4 are oak leaves. In your friend's collection of 36 leaves, 3 are oak leaves. Whose collection has a greater fraction of oak leaves? how do i convert it into a fraction?

Chemistry
BrO3- + 5Br- + 6H+ <--> 3Br2 + 3H2O If 25.0 ml of 0.200-molar BrO3- is mixed with 30.0 ml of 0.45-molar Br- solution that contains a large excess of H+, what is the amount of Br2 formed, according to the above equation? The answer is 0.00810 moles but I don't know ...

Calculus
i think u forgot to add the 2x^3 to the antiderivitive for the fundamental theorm step

Calculus
your right im sorry, i was thinking we were rotating around x=3 lol but will you do it so i can check my answer?

Calculus
No it wouldnt be the same because one is a disk rule one is a washer rule

Calculus
washer method!? Find the volume of y=x^2+3, y=3, between [0,2] around y=3

Calculus
Using the Disk Method or washer method (im not sure which one) Find The volume of y=x^3 , y=1 , x = 2 revolving around the X axis

math
Rearrange and simplify for x when y= mx+b

math
thanks mark

math
Rearrange and simplify for b when A= 1/2 bxh

Biology
I just need somebody to explain in plain english what "Immune Modulation" is. Google doesn't help at all, it just directs me to bunch of science research papers!

Biology
What is the difference between type I and type II immune response?

History- WWI
Does anyone know about the Canadian Stormtroopers?? I heard during world war 1 Germans named the Canadians "Stormtroopers"- Who were they? Some links would be helpful! Thanks

english
thanks for the help (haha dad i was right!)

english
is superiority an emotion? - The feeling of superiority

bio
the nucleolus would be the head office or something that controls the whole thing

Chemistry
you increase the atomic number but i don't know why I think because the atoms gain more electrons the higher they go on the periodic table

science
the spraying of pesticides may kill the mosquitoes but the remaining mosquito that survive the chemical grow an immunity to the pesticide causing them to grow a gene that prevents the insect to die to the pesticides Also when the pesticides reproduce they create new mosquitoes...

9th grade chemistry
the 2 in the chemical equation means that the element contains more than 1 Hydrogen atom Example H20 = Water 2 hydrogen and 1 oxygen molecule

English
okay thanks I was really stuck with that one XD

English
okay but what i'd like to know is why is it important for someone to be able to interact in society, don't they think that they feel happy enough???

English
Question : Matthew Antony, Grant’s former teacher tells him, “What do you know about life?” He tells him, “ You have to go away to know life.” – What does this mean to you? I need some pointers to help me answer my question... (like extra ideas)

Biology
the nucleus would be like the head office (or something that controls the whole thing)

Chemistry
what are the order intermolecular forces according to strength??

social studies
Can anyone answer any of these questions....? I'm not very associated with the Chicago area.. - What site is near or at the Chicago River today? - How is the area from Lake Michigan to the Chicago River important today? What was the problem with the area in the 1830s and ...

Chemistry
Why does the reaction of 2-bromo-2-methylbutane and ethanolic solution of silver nitrate interfered by the presence of water in the sodium iodide in acetone reagent? (Substitution chemistry) Thanks for any help!!

english
In grade 11 and trying to understand this poem which the teacher gave very little explanation for, telling to "interpret the poem for yourself" The poem is called Bushed and is written by Earl Birney. He invented a rainbow but lightning struck it down shattered it ...

math
How to convert -1.7 into fraction thanks

math 8th grade
negative one and two tenths minus 5 tenths

the subject is science
thanks

8th grade
Can we obtain water from milk, vinegar & ink. What are the steps how to do it Thanks

Math
The per capita public debt (in thousands of dollars) of the United States for the years 1940 to 1990 appears below. Create a scatterplot and determine a trend line. Based on your scatterplot, what do you expect the per capita public debt to be in 2020? Year-1940 1950 1960 1970...

7th grade
There isnt one

Chemistry
What is the balanced equation for the preparation of cis-1,2-cyclohexanediol???

Chemistry
Please help!! It's due tomorrow morning!!!!! --Why is it necessary to use a mixed aqueous-organic solvent system for the oxidation of cyclohexENE?

Calculus
If the tolerance on the volume of a cube is a 2% error then what should the tolerance be fore each side? So what i did was V=x^3 dV = 3x^2 dx dV/V = 2% What should I do next? the answer is 2/3% but I don't know how it works. Thanks.

ap biology
what is difference between blending patterns of inheritance and particulate patterns of inheritance?

11th grade
what is difference between blending patterns of inheritance and particulate patterns of inheritance?

Math riddle PIZZAZZ Worksheet
he was jumping for joy

Chemistry
I'm so confused!!!!!!!!!! I need to write out the equation for the reaction between (+)-tartaric acid and (+_)-1-phenylethylamine. I know tartaric acid is C4H6O6 and 1-phenylethylamie is C8H11N. Where do I go from here?

Spelling
Sorry, another quick question... u is a vowel, so shouldn't there be a "an" before it?/ For example: "Distress is not an universal association..." However, microsoft word keeps correcting me to say "a" instead.

Grammar
thank you!!

Grammar
Which one is correct? "There are studies and research that supports categorizing obesity as a mental disorder..." or "There are studies and research that support categorizing..."

CHEM
1.46,1.98

Phyics
A rubber ball with a radius of 4.8 cm rolls along the horizontal surface of a table with a constant linear speed v. When the ball rolls off the edge of the table, it falls 0.83 m to the floor below. If the ball completes 0.68 revolutions during its fall, what was its linear ...

chemistry
it means that salt is made up of different stuff then the things that you use to make it.

English
A question on "The Lottery" by Shirley Jackson ? I am writing an essay explaining how the use of literary devices creates a sense of horror. I wrote down things like "withheld knowledge" (that the author not telling readers the "prize" of the ...

science
this is the blank word

science
This is because the energy from the sun is __________ the water up. Is this heating?

Calculus
how do i find dy/dx of y = (x^3-1)/cos(x) do I start with (x^3-1)*cos(x)^-1 ? Thanks!

social
in the pacific northwest

social
i mean chinook salmon

social
what is the season that salmon return?

science
search mold in wikipedia

Spelling
hmm... e i guess

social
oh they were made of sinew?

social
um i need info on native american fishing nets

AP Chemistry
Thanks!!

AP Chemistry
2K (s) + 2H2O (l) --> 2KOH (aq) + H2 (g) When 0.400 mole of potassium reacts with excess water at STP, what is the volume of hydrogen gas produced? the answer is 4.48 liters but I keep getting wrong numbers! please help! Thanks!

AP Chemistry
since PV=nRT PV/nRT = 1 or did you mean PV=nRT? P is pressure in atm and V is volume in liter and n is # of moles and R is 0.08206 and T is tempurature in Kelvin.

5th grade math
i still don't get bob help!!!!!!!!!!

5th grade math
the sum of two numbers is 34. their difference is 18. what are the two numbers?

chemistry
Assume that the entire mass of an atom is concentrated in its nucleus, a sphere of a radius 1.5 x 10 to the -5 pm. If the mass of the atom is 2.39 x 10 to the -22 g, what is the density?

math
i think you divide 500 by 6

5th grade
thanks

5th grade
if a letter has a line on it does it mean its a long or short

chemistry
what is the total pressure of a gas mixture that contains hydrogen at 0.45atm nitrogen at 0.25 atm and argon at 0.60 atm

5th grade math urgent
Okay look: 00-01-$7586 01-02-$8022 02-03-$8502 03-04-$9249 04-05-$9877 Jason started college during the 2001-2002 year and graduated during the 04-05 year. How much did Jason's education cost? How do you do it????

social studies
thank you just wat i needed

social studies
i mean, i wanted a picture of the net

social studies
Can you find some links to a site that has a picture of a northwest indian fishing

Psychology
I have a pretty specific question... I'm wondering if the "Binge-Eating Disorder" is actually included in the DSM 4 as one of the disorders, or if it's just in there for one of future considerations.

artist
its just like a hobby. Some people like it some don't.

math
one difference between identity,zero, commutatiive and associative property

5th grade math
625 thousands

Chemistry
What volume of 3.0M Na2SO4 must be added to 25ml of 1.0M BaCl2 to produce 5.0g of BaSO4? The answer is 7.1ml but I don't get it very well. I thought I could use mole ratio of the balanced equation, but it did not work. Thanks a lot!

writing
I have to write a narrative essay about a time when i had to do something that went against my beliefs or convictions. I thought about it for like an hour, but I can't figure out a decent example. Can anyone tell me an example so I can understant what kind of topic would ...

5th grade
your question isn't clear

math
simplify and evaluate where g=3 (2g-1)^2-2g+g^2

5th grade math
25 25 out of 5 is 5 because 25divided by 5 is 6. 5x5 is 25.

math 2nd grade
58

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