Friday

April 18, 2014

April 18, 2014

Total # Posts: 1,682

**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?

**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.

**3rd grade**

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

**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...

**Chemistry**

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

**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?

**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?

**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 con...

**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

**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

**math**

hi what is what is (x^-3)^2

**math**

What is (x^2y^6-3)^2

**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!

**math**

is 5(x+1)/3 ....a simplified answer or is it (5x+5)/3

**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

**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

**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 co...

**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 :)

**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. cesiu...

**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

**Physics**

wait wouldnt you add them because they are both going south

**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

**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...

**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.

**algebra**

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

**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.

**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...

**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...

**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...

**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.

**college Chemistry**

Ok this is the question... Complete the combustion of butane... CH3CH2CH2CH3 + O2 ====> ____________

**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...

**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?

**science**

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

**Math**

40 + 40 = 80 so 2 1/2

**social studies**

There are 32 people.

**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 e...

**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.

**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.

**chemistry**

its 2/1000

**Science - gr. 10 physics**

How do you find displacement when given a velocity/time graph?

**7th grade**

is this like a homework question or are you just wondering?? lol

**chemistry**

Do you mean 58g/mole?

**math**

How could knowing that 35/7=5 help you find 42/7? Explain

**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

**biology**

Because it can

**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

**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?

**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 s...

**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 sim...

**english**

should i add more information 2 my side....or equal information about both sides thanks

**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 fr...

**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.

**accounting**

If i have $550.00 a week.how much is the state deductions in the state of california for one week?

**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!

**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!

**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

**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...

**organic**

alpha-amino

**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 ...

**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 follow...

**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 by...

**english**

Which of the craftsmen is in charge of the rehearsals?

**math**

how do you square numbers when your typing?

**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.

**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)]

**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)]

**organic**

Explain why glucose undergoes mutarotation

**Organic**

Are any of the following a tertiary amine 2-methyl-2-butanamine N-Methyl-1-butanamine N-Methyl-2-butanamine

**chemistry**

C6H5NO2+? = C6H5N2Cl

**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

**chemistry**

what is the best combination for preparing CH3CH2CH2CH2OCH3 is CH3CH2CH2CH2OH+NaOCH3 CH3CH2CH2CH2ONa+NaOCH3 CH3CH2CH2CH2Br+NaOCH3 CH3CH2CH2CH2Br+CH3Br

**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

**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

**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

**o chem**

a-D-glucose and b-d-glucose can best be described as? -diasteromers -constitutional isomers -different conformations -enantiomers -keto-enol isomers

**7th grade pre algebra**

The Answer is: Chicken Wings

**math**

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

**science**

why is mitosis important?

**7th grade algebra**

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.

**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.

**Science**

What bird is considered a sign of the coming spring?

**3rd grade art**

He is doing a book report. (Old school.) LOL

**nonfiction**

just took test 100 answers are crrect

**math 7th grade**

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.

**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...

**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 teac...

**Math**

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

**Algebra**

a+6a-9=30

**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???

**algebra**

Is the LCM for xy, y3 = x3y3, y3

**Science**

It is an imaginary line that goes around the center of the earth to separate the northern hemisphere (top) from the southern hemisphere (bottom)

**chemistry**

I would say temperature because increasing temperature would cause molecules speed up and increase volume and decreasing temperature usually decreases molecular speed and causes volume to decrease (except for water)

**Chemistry/hydrolysis of ATP**

A freshman studying medicine at an Ivy League College is a part of his class crew team and exercises regularly. After a particularly strenuous exercise session, he experiences severe cramps in his thighs and pain in his biceps. Explain the chemical process that occurred in hi...

**Men's Health**

I was wondering if someone know's aof a web-site that may be able to help me I have to look up the following and explian them also benefits and risks of them thanks ( Basically what effects good/bad have on Men's health) Epimedium Leaf Chinese Dodder Seed Ginseg ophiop...

**ORGANIC CHEMISTRY**

by x in the first one did you mean OH

**ORGANIC CHEMISTRY**

WHAT IS THE BEST COMBINATION OF REACTANTS FOR CH3CH2CH2CH2OCH3

**ORGANIC CHEMISTRY**

WHICH ONE OF THE FOLLOWING ALKYL HALIDES GIVES THE HIGHEST RATIO OF SUBSTITUTION TO ELIMINATION ON TREATMENT WITH SODUM ETHOXIDE IN ETHANOL 1-BROMOPENTANE 2-BROMOPENTANE 3-BROMOPENTANE 1-BROMO-2-METHYLBUTANE 2-BROMO-2-METHYLBUTANE

**organic chemistry**

How many stereogenic carbon atoms does the alkaloid morphine have?

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