Monday

September 26, 2016
Total # Posts: 956

**chemistry**

Thank you very much for your time.

*March 15, 2010*

**chemistry**

Nitroglycerine decomposes according the the equation: 4C3H5(NO3)3 -> 12 CO2 + 10 H2O +6N2 + O2. 15.0 g of nitroglycerine is placed in a 500 ml flask at 25.0 C. The vapor pressure of water at this temperature is 23.8 mmhg. Find the total pressure in the flask after the ...

*March 15, 2010*

**physics**

rofl do you go to W-L?

*March 10, 2010*

**Physics**

A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed is 7.0 ...

*March 7, 2010*

**Physics**

A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed is 7.0 ...

*March 7, 2010*

**math algegra**

one type of probablity used practically daily is?

*February 27, 2010*

**Math**

how do you solve: 2A^2-7a-15

*February 24, 2010*

**Mathematics**

Thanks. i worked it out and it came out to = 4 liters

*February 24, 2010*

**geography**

what is china's culture? please give examplesa Thank you!

*February 23, 2010*

**Chemistry**

A sample of .234g of carbon is placed in a closed stainless steel bomb with .502g of of oxygen gas. The mixture is ignited giving of carbon dioxide. How many grams of carbon dioxide should be obtained upon combustion?

*February 21, 2010*

**Finance**

John borrowed $1,000 discounted at 10% for six months. How much did he receive when the loan was made? I get $952.38 by using the formula below: 1000=P(1+.10/2)^(.5*2) - am I doing this right?

*February 18, 2010*

**Finance**

Determine the amount of each payment to be made to a sinking fund in order that enough money will be available to pay off the following loan. $29,000 loan, money earns 12% compounded annually, 42 months. I tired doing this using the future value of an ordinary annuity formula...

*February 18, 2010*

**Economics**

This chart shows the components of nominal GDP for the years 2000 and 2001. All figures are in billions of current dollars. Components 2000 2001 Consumption $6,684 $6,987 Investment $1,755 $1,560 Government Spending $1,751 $1,858 Exports $1,101 $1,034 Imports $1,467 $1,383 ...

*February 7, 2010*

**Economics**

What percentage of GDP in 2000 is consumption

*February 7, 2010*

**Math (repost)**

In standard form, find the equation of the circle that passes through the origin and x-intercept 1 and y-intercept 2. (I fixed a correction a little too late after a response.) Help please? thanks!

*February 7, 2010*

**Physics**

Calculate the speed needed by a spacecraft to maintain a circular orbit at about 350 km above Earth’s surface. (it's a project where we create our own spaceship. let's say the craft is 500kg) --- Not sure about the formula to find this. All I know is that it may ...

*February 6, 2010*

**Math**

woah, oops. the y-intercept is 2.

*February 6, 2010*

**algebra**

You can work a total of no more than 34 hours per week at your two jobs. House cleaning pays $8 per hour and your sales job pays $6 per hour. You need to earn at least $245 per week to cover your expenses. Write a system of inequalities that shows the various numbers of hours ...

*February 4, 2010*

**chemistyr**

0.115

*February 2, 2010*

**math/probability**

the anwser is 4

*January 15, 2010*

**ecology**

hawk

*December 15, 2009*

**Pre-algebra**

nope,I'm not very good in math as well :(

*December 13, 2009*

**Social Studies**

What is the Socratic Method?

*December 13, 2009*

**Pre-algebra**

hi,are you good at World History?

*December 13, 2009*

**Social Studies**

Um excuse me,could you help me with this one problem I have?I don't understand it

*December 13, 2009*

**science**

Hi, quick question: Graphite is burned in oxygen to give carbon monoxide and carbon dioxide. If the product mixture is 33% CO and 67% CO2 by mass, what is the heat from the combustion of 1.00 g of graphite? dH values: CO:-110.5 kj/mol, CO2: -393.5 kj/mol Thanks!

*November 24, 2009*

**Calculus**

Use linear approximation, i.e. the tangent line, to approximate 8.4^(1/3) as follows: Let f(x)= x^(1/3) . The equation of the tangent line to f(x) at x=8 can be written in the form y=mx+c where m=1/12 and c=4/3: Using this, find our approximation for 8.4^(1/3).

*November 15, 2009*

**AP Chem**

This post helped immensely, thank you so much and merry Christmas!

*November 12, 2009*

**science**

which of earth's spheres extends into all others

*November 11, 2009*

**Math**

Use linear approximation, i.e. the tangent line, to approximate sqrt[3] { 8.4 } as follows: Let f(x) = sqrt[3] x. The equation of the tangent line to f(x) at x = 8 can be written as y=mx+c where m=1/12 b=4/3 find the approximation for sqrt[3] {8.4}

*November 8, 2009*

**8th grade**

Please Help Me. I'm doing a Science Fair Project, and I need help with finding simmilar experiments to mine. My experiment is: Which saliva is cleaner: Cat, Dog, or Human???

*October 28, 2009*

**world history**

why did the industrialized nations of the world embark so aggressively upon imperialist ventures between 1880 and 1914?

*October 26, 2009*

**Physics (Rotational Kinetic Energy)**

Hello, The question is: A solid ball rolls along the floor with a constant linear speed v. Find the fraction of its total kinetic energy that is in the form of rotational kinetic energy about the center of the ball. Krot/Ktotal = ? The answer I keep getting is 3/1, but the ...

*October 21, 2009*

**psychology**

It also depends on the habituation of the stimulus. Rather than conditioned excitation, you would get conditioned inhibition here.

*October 21, 2009*

**Biology**

How is the expression of sex-linked genes similar and different from the expression of autosomal genes?

*October 21, 2009*

**Biology**

How is the expression of sex-linked genes similar and different from the expression of autosomal genes?

*October 20, 2009*

**french**

YOU legs hurt?

*October 20, 2009*

**English**

free verse does not mean don't use needed punctuation or capitalization. As I searched for examples of free verse, I found many that didn't have punctuation (which caused ideas and thoughts to run together) and didn't have capitalization, which distracts from the ...

*October 20, 2009*

**Biology**

I am having trouble descibing how the expression of sex-linked genes is similar and different from the expression of autosomal genes?

*October 20, 2009*

**economics**

Suppose that the government decides to charge cola consumers an excise tax. Before the tax, the market is in equilibrium, where 12 million cases of cola are sold every month at a price of $3.50 per case. After the tax, 6 million cases of cola are sold every month; consumers ...

*October 16, 2009*

**math 8th grade**

72/100=x/200 **cross mulitply: 100x=72*200 100x=14400 x=14400/100 x=144 ______ Or just multiply .72 by 200 .72*200=144

*October 5, 2009*

**Physics (Normal Force)**

When a book weighing 10 N is placed on a table, the table exerts a normal force of 10 N on the book. When a crate weighing 250 N is placed on the same table, the table exerts a normal force of 250 N on the crate. Explain the mechanism that allows the table to exert just the ...

*October 1, 2009*

**calculus**

how do you solve e^(9ln2)

*September 29, 2009*

**10th grade algebra**

7x-15y+9=0 **Subtract 9 from both sides 7x-15y=-9 **Subtract 7x from both sides -15y=-7x-9 **Divide both sides by -15 y=(7/15)x+(9/15) <--- equation isolate for y

*September 22, 2009*

**chemistry**

12

*September 18, 2009*

**biology**

What do you think?

*September 7, 2009*

**Math (Angle Calculation)**

Would -75.74 degrees be the same as 284.26 degrees?

*September 7, 2009*

**math**

Could you tell me how exactly to graph piecewise functions.

*July 23, 2009*

**Physics**

anyone know the answer?

*June 25, 2009*

**pchem**

Use R = 8.2 × 10–5 m3 atm/mol K and NA = 6.02 × 1023 mol–1. The approximate number of air molecules in a 1 m3 volume at room temperature (300 K) and atomospheric pressure is: 41 450 2.5 × 1025 2.7 × 1026 5.4 × 1026

*June 24, 2009*

**Chemistry College (Need to know!)**

How is this Possible GK. Everywhere I have looked, including mark schemes and chemistry websites dH(solution) is worked out via this equation: dH(solution) = dH(LE) - dH(hyd) + dH(hyd) What is it you are working out with solute and solvent?

*June 11, 2009*

**Chemistry College (Need to know!)**

Am I Correct in assuming this? dH of solution = -dH of lattice enthalpy + dH of hydration E.g: dHsolution NaCl = -dHLE NaCl(s) + dHhyd Na+(g) + dHhyd Cl-(g) Units as kJmol-1

*June 11, 2009*

**Chemistry College**

Am I Correct in assuming this? dH of solution = -dH of lattice enthalpy + dH of hydration E.g: ÄHsolution NaCl = -ÄHLE NaCl(s) + ÄHhyd Na+(g) + ÄHhyd Cl-(g) Units as kJmol-1

*June 10, 2009*

**Chemistry College**

Well to be honest I wasn't there for the teaching of this in my class due to University interviews. I was just wondering how you actually work through them as other websites i have been on have all been in too much (universty standard) detail. Thank you for the fast response!

*June 10, 2009*

**Chemistry College**

Is there a simple formula for the Enthalpy of solution and/or hydration?

*June 10, 2009*

**english**

hi what does this quote mean I am responsible. Although I may not be able to prevent the worst from happening, I am responsible for my attitude toward the inevitable misfortunes that darken life. Bad things do happen; how I respond to them defines my character and the quality ...

*May 24, 2009*

**8th grade**

its not beef flat retard.

*April 1, 2009*

**us**

hi i have to write a paper stating that malcolm x was a better leader than martin luther king jr. I need a lot of help

*March 30, 2009*

**history**

what other civil rights leaders could i really use

*March 24, 2009*

**history**

hi. I need to write a 5 page paper describing how Martin Luther King's leadership was not needed in the civil rights movement. I need a lot of help and information. Thank you soo soo much.

*March 24, 2009*

**chemistry**

i dont get part three at all please help

*March 16, 2009*

**chemistry**

suppose that you could decompose 0.250 mole of Ag2s into its elements a.How many moles of silver would you have? how many moles of sulfur would you have? b. how many moles of ag2s are there in 38.8 g of AG2S? how many moles of silver and sulfur would be produced from this ...

*March 16, 2009*

**chemistry**

can u show me how to set it up because i dont get it at all

*March 16, 2009*

**English**

I'm confused. In the Great Gatsby, did Myrtle get killed in Chapter 8 or was that a flashback, or something that Nick just learned of at that time? Thank you

*March 12, 2009*

**science**

look

*March 12, 2009*

**Historical Fiction**

My teacher wants me to write a historical fiction story. We need a source from the internet with ".edu" at the end of the address. My paper is going to be on World War II, so could you find a website on World War II with ".edu" at the end?

*March 2, 2009*

**Chemistry**

2. Calculate the volume for the following object If you know that the object has a mass of 24 grams and the density is 12 g/ml. I tried to get rid of the 24 by multiplying it on both sides, and dividing on both sides, but neither worked. What will then? Thanks!

*February 15, 2009*

**Jiskha in General**

Are some of the people on this site teachers? How do they have time to answer our questions? Don't they have to grade papers and such? I'm just curious and grateful that some people are willing to always be on here.

*February 15, 2009*

**chemistry**

We have 1 mol of N2 gas that is heated at constant pressure from 300K to 5770K on the surface of the sun. i) Find H and S given that P for nitrogen is (25.7 + 0.0130T) J/mol-K. ii) Now, redo your calculation assuming that the second T-dependent term in the P ...

*February 11, 2009*

**4th grade**

What is the correct way to write each of these Titles correctly? 1.highlights 2.child of fire 3.the downtown news 4.number the stars

*February 5, 2009*

**MIST**

SIN (X+Y) SIN (X-Y) = SIN ^2X - COS ^2Y

*February 3, 2009*

**History**

Hi. I need to find a lot of information on World War II. My teacher wants me to use only websites that have .edu at the end. Could you help me find a website?

*January 31, 2009*

**math**

sketch the graph of y^2=(1/4)x

*January 30, 2009*

**physical science!!!!!!!!**

1. Alex pulls on the handle of a claw hammer with a force of 15 N. If the hammer has a mechanical advantage of 5.2, how much force is exerted on a nail in the claw? 2. While rowing in a race, John pulls the handle of an oar 0.08 m on each stroke. If the oar has a mechanical ...

*January 22, 2009*

**physical science**

Alex pulls on the handle of a claw hammer with a force of 15 N. If the hammer has a mechanical advantage of 5.2, how much force is exerted on a nail in the claw?

*January 22, 2009*

**history**

did native american colonize or immigrate?

*January 19, 2009*

**calculus**

It is known that if m <= f(x) <= M for a <= x <= b, then the following property of integrals is true. m(b-a) <= int_a^b f(x)dx <= M(b-a) Use this property to estimate the value of the given integral. ? <= int_0^3 3/(1+x^2)dx 2 <= ? solve for the ?

*January 17, 2009*

**calculus**

given: f(x) = 2-1/4 x Evaluate the Riemann sum for 2 ≤ x ≤ 4 , with six subintervals, taking the sample points to be left endpoints.

*January 16, 2009*

**Chemistry**

How can you separate compounds?

*January 13, 2009*

**us history debate**

i really don't know what to do. PLease please help me

*January 12, 2009*

**us history debate**

Hi. I am doing a debate on wheter united states imperialism in the late 1800s to early 1900s was justified. I am on the side that states that imperialism was justified. I need help coming up with points to put in my rebuttal. i already have my opening statemnt done but I don&#...

*January 12, 2009*

**Algebra**

Give the domain for each of the following: 5+2y/6 5-r/r 2y+1/y+5 I dont get these so yea thank you!

*January 8, 2009*

**Recent History**

I don't understand what the big deal was about Y2K. Why would the world stop just because the computers would...I mean we existed all of these years without computers. It would make life more difficult certainly, but it wouldn't entirely end life as we know it.

*January 5, 2009*

**Math**

How do you compute 10 (to the -4)(as the exponent)

*December 8, 2008*

**philosophy**

Why do the Skeptics treat lack of belief as the goal of life? what purposes does that serve for them?

*December 5, 2008*

**physics**

bjkhkh

*December 2, 2008*

**calculus**

Find an equation of the tangent line to the curve at the point (0, 1). y = (1 + 3x)20 i got y' = 60(3x+1)^19 what do i do next?

*November 10, 2008*

**calculus**

differentiate y=x sin((4)/x)

*November 10, 2008*

**eng**

how would i deal with this? Each generation has some thing valuable to offer This generation information dispersal, my generation-heavy metal my parents--they paved the way

*November 4, 2008*

**English**

teacher

*November 3, 2008*

**English**

no kidding that's the way they want it for the outline. They also want us to show our stylistic devices in the outline. Just a weird way of learning it.

*November 3, 2008*

**eng**

Outline: 4) Also the Government will not incur the cost of defaulted student loans. a. High debt loads are not being paid (Stat) 800 million overdue on defaulted loans b. Relief programs are faulty (Fact) Debt management programs require loans to be in good standing (not in ...

*November 3, 2008*

**eng**

hows my outline look? Outline: 1)Post secondary education is unaffordable A)Poor students can’t afford tuition (Stat) tuition has increased by Fifty-percent B) The Government has implemented grants, scholarships and student loans to help. Thesis: I’m going to write ...

*November 3, 2008*

**calculus**

Show that the curve given below has no tangent line with slope m1, where: y = 4 x^3 + 8 x - 6 m1 = 7

*November 3, 2008*

**calculus**

find the points on the curve y=2x^3+3x^2-12x+1 where tangent is horizontal.

*November 3, 2008*

**chemistry**

write the total and net ionic equation for calcium hydroxide(aq) -> acetic acid(aq)

*November 1, 2008*

**chemistry**

How many total moles of ions are released when each of the following samples dissolves completely in water? 30.2g of Ba(OH)2 8H2O

*October 31, 2008*

**Chemistry**

is KAl(SO4)2 12H2O hygroscopic, deliquescent, or efflorescent?

*October 30, 2008*

**english**

Ok, having some troubles the question is why does soccer inspire so much passion around the world probably because it provides a unifying identity. Gives the poor something to aspire to, provides role models, and unities them for a common purpose. do i have to much ?

*October 30, 2008*

**Calculus derivatives**

f(a) = a + √a (a) Find the derivative of the function using the definition of derivative.

*October 27, 2008*