Sunday

December 21, 2014

December 21, 2014

Total # Posts: 444

**Chemistry**

For the reaction of hydrazine (N2H4) in water, Kb is 3.0 10-6. H2NNH2(aq) + H2O(l) H2NNH3+(aq) + OH -(aq) Calculate the concentrations of all species and the pH of a 2.2 M solution of hydrazine in water. okay so i dont know how to do this problem because its dealing with Kb i ...
*February 14, 2009*

**Anatomy**

What lipoprotein is associated with cholesterol and the production changes in blood vessles?
*January 30, 2009*

**English**

What is an analogy?
*January 20, 2009*

**Biology**

What is needed for respiration?
*December 11, 2008*

**mathematics**

R^0.75=24
*September 7, 2008*

**English**

The Kenning technique- im not sure that i get this: teacher: stepmother? busdriver: firemen: television: information box meatloaf: police: law keepers poptart: breakfast food music: great noise love: computer: touch information I dont know, any suggestions?
*September 7, 2008*

**Chem -plz check work**

suppose that 2.00 mL of 0.01 mol/L sodium sulphide is used to test a 50.0 mL sample of water containing 0.0005 mol/L mercury nitrate ions. What mass of precipate is formed? Na2 = Hg(NO3)2 --->2NaNO3 + HgS My Work: nNa2S=0.002*0.01 =0.0002 mol nHg(NO3)2=0.05*0.0005 =0....
*May 28, 2008*

**math**

change the following statements into the algebraic expressions: four times the sum of x and 5= a)would it be 4x+5?? and how do i write 16 larger than the product of a and b
*May 22, 2008*

**chemistry-stoichiometry**

how many grams of chlorine can be liberated from the decomposition of 64.0g of AuCl3 by this reaction 2 AuCl3----> 2 Au + 3cl2
*May 19, 2008*

**Help! for Chemistry H.W.**

I need help with my chem home work. Please show me the answers because this question is a very confusing question to me. Therefore I really need you to provide the answer to this question please... Question 1: A sample of CO2 gas with a mass of 0.30 g is placed in a 250 mL ...
*April 29, 2008*

**english-fallacies**

I need help distinguishing between fallacies
*April 10, 2008*

**Algebra**

I need to test the integral bounds for the roots. 6x^3-7x^2+7x+9=0 I used synthetic division to find my answer. 1 6 -7 7 9 6 -1 6 6 -1 6 15 0 6 -7 7 9 0 0 0 6 -7 7 9 -1 6 -7 7 9 -6 13 20 6 -13 20 29 2 6 -7 7 9 12 10 34 6 5 17 43 my answer: -1<x<1 I don't understand ...
*April 5, 2008*

**Algebra**

Write all real and imaginary zeros. f(x)=x^3-8x^2+x-8 -8--1,-2,-4,-8 1 -+1,-+2,-+4,-+8 1 -8 1 -8 1 1 -7 -6 1 -7-6 -14 2 1 -8 1 -8 2 -12 -22 1 -6 -11 14 4 1 -8 1 -8 4 -16 -60 1 -4 -15 -52 8 1 -8 1 -8 8 0 8 1 0 1 0 answer: 8 is zero of f(x)
*April 4, 2008*

**Algebra**

Write all real and imaginary zeros. f(x)=x^3-8x^2+x-8 -8--1,-2,-4,-8 1 -+1,-+2,-+4,-+8 1-8 1-8 1 1-7-6 1 -7 -6 -14 2 1 -8 1 -8 2 -12 -22 1 -6 -11 -30 4 1 -8 1 -8 4 -16 -60 1 -4 -15 -52 answer (?) 8 is zero of f(x) 8 1 -8 1 -8 8 0 8 1 0 10
*April 3, 2008*

**Science**

I am trying to find an example of how to write a prediction for a Biology Lab Report. I think a prediction should be written as an if/when statement. Does anyone know of some where that I can find a lab report that includes a prediction(s)? All of the website show predictions...
*April 1, 2008*

**Algebra**

I don't know which is which y=(x+9)^2-3 I know it is all real numbers, but i don't know if my answer should be [-3,00) or (-9,00) Can some one explain this?
*March 29, 2008*

**Algebra**

But the reason I am having trouble is because the middle one does not work. The first part works, but the second part does not. 3<=x<=8=3(3)=9 8=3(3)=9 (?)
*March 28, 2008*

**Algebra**

Can someone tell me what I am doing wrong? Do I need to graph this to get the right answers? Problem: Find the requested value. f(3) for f(x) 3x+1, if x<1=3(3)+1=10 3x, if 3<=x<=8=3(3)=9 3-5x, if x>8=3-5(3)=-12
*March 28, 2008*

**Algebra HELP!**

solve 7x+5(-3x-4)=-21-7x 7x+(-15x-20=-7x-21 -8x-20=-7x-21 7 7 -8x-20+7x=-21 -1x-20=-21 20 20 -1x/-1 = -1/-1 x=1
*March 21, 2008*

**Biology**

"D" Y-Linked because a certain opening of the organs, if you are taking the class you should recognize the shape! Nice helping someone of my knowledge! Lori
*March 20, 2008*

**Algebra**

Rationalize denominator, all variables positive real numbers and denominator is not zero. sqrt3/3 sqrt2 - sqrt3 sqrt3(3sqrt2+sqrt3)/18-3 3 sqrt6+3/18-3 3 sqrt 6+3/15 (is this my answer)
*March 13, 2008*

**Algebra**

What does domain mean? I am working on a problem that wants me to solve for the domain?
*March 13, 2008*

**Communications**

I need help finding information on the Social Penetration Theory
*February 25, 2008*

**Chemistry**

Can someone tell me if I am any where close or if I need to start over. When your acetic acid reacted with the sodium hydroxide, what are the two products that were formed? When acetic acid reacts with sodium hydroxide the two products that are formed are a water and a ...
*February 17, 2008*

**Math**

What multiplication fact can be found by using the arrays for 2x9 and 5x9?
*February 11, 2008*

**Chemistry**

Did I do this correctly or do I need to try again? What is the mass percent of a solution when 18.6 g of table salt is added to 81.4 g of water? Mass Percent = mass of solute(g)x100 mass of solution (g) = 18.6 g x100 18.6 g + 81.4g = 18.6 g x 100 100g = 0.186 x 100 = 18.6 The ...
*February 8, 2008*

**Chemistry**

Would it be volume divided by moles then convert to g
*January 30, 2008*

**Chemistry**

calculate the final concentration if 4.0 L of 1.5 M NaCl and 2.0 L of 3.0M NaCl are mixed. I am confused about how to calculate the final concentration. We are currently working on solutions. I think first I need to divide the amount of the solution by the amount of the solute...
*January 30, 2008*

**SCI**

What if you cannot find the answer to one of the questions? What is wrong in reaching for help. I cannot find one answer, does that make me lazy or stupid?
*January 13, 2008*

**Earth Science**

My question is what is the ability of some natural materials to reflect and absorb sunlight? What do they mean natural materials? I could answer this on my own if I understood what is considered a natural material.
*December 19, 2007*

**Earth Science**

Why is it generally warmer in a rural area than in an urban area? I have a question: How does the earth's surface heat up or cool down? My answer: the sun heats up the earth darker surfaces are warmer than cooler surfaces. Please help.
*December 19, 2007*

**geometry**

which equation is parallel to the graph of the equation 4x+y=-2 and passes through the point (5,3)?
*October 12, 2007*

**geometry**

which equation is parallel to the graph of the equation 4x+y=-2 and passes through the point (5,3)?
*October 12, 2007*

**algebra question**

To convert "square" feet to "square" yards you divide square feet by 9 (3 squared), right? Then the answer is $237.60.
*October 1, 2007*

**English**

what is it called when you can't put the words an, a or the infront of a noun?
*September 11, 2007*

**english**

what is a Paragraph Rationale I assume a paragraph rationale is a paragraph giving the reasons supporting a decision. For instance, I might write a paragraph rationale supporting the Jiskha Homework Help Forum and its value in helping students.
*August 14, 2007*

**International Business**

Why is acceleration / delay of payments more useful to an IC than to smaller, separate companies?
*May 5, 2007*

**math check please**

could you show how you figured out the answer for how many students lived on campus
*January 18, 2007*

**sequence**

defining function is f(x) = 3x+b. If 27 is a member of this sequence, what is the next consecutive member of this sequence? PLEEEEAAAASEEE HELLLLP meeee f(x)=3x+b f(x+1)= 3x + 3 + b so there is a difference of 3 between numbers. Next number is 27 + 3
*January 16, 2007*

**lynching**

need any help available on writing a report on lynching. Need help getting started. Have all kinds of research but not sure how to put it together. Need an outline too. 1. Introduction (define, very brief history) 2. Theory of Origin 3. Detailed History of Lynching in U.S. 4. ...
*November 20, 2006*

**algebra 2**

a swimming pool 50m by 25 m is to be built with a walkway w meters wide around it write the total area of the pool and walk way in the form ax exponet 2 +bx+c
*November 1, 2006*

**Physics**

Runner A is initially 6.0 km west of a flagpole and is running with a constant velocity of 9. km/h due east. Runner B is initially 5.0 km east of the flagpole and is running with a constant velocity of 8.0 km/h due west. How far are the runners from the flagpole when their ...
*September 25, 2006*

**economics**

according to the law of demand,when will higher corn prices reduce the quanity demand of corn?
*September 5, 2006*

**unscrambling word**

iidonxs can someone please help to unscramble
*June 14, 2005*

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