Thursday

February 11, 2016
Total # Posts: 34

**analytical chemistry **

At what ph will Al(OH)3 begin to preciptate from a .10 M solution of AlCl3?
*October 27, 2015*

**analytical chemistry**

150 mL of a solution contiains .00015 M NaI, .0055 M NaC, and .12 M Na3PO4. A solution of .10 M AgNo3 is slowly added. Who precipitates 1st, 2nd, and 3rd? When the last one to precipitate just begins to precipitate, what % of the other 2 anions are still remaining in solution?
*October 27, 2015*

**analytical chemistry **

How many grams of Ca(OH)2 can be dissolved in 550mL of a .0500 M NaOH solution. Ksp - Ca(OH)2 is 5.5 x 10-5
*October 27, 2015*

**New delhi **

Find molarity of 20%aqous soluion of amino . the density of the solution is 1.4 grams/ml
*July 21, 2015*

**phy111**

1 The principle of conservation of heat energy states that that when an object is at constant temperature or is in thermal equilibrium, it is losing and gaining heat at equal rates. the heat lost by a hot body is equal to the heat gained by the cold body in any system provided...
*April 5, 2015*

**Chem**

1. What is the molarity of a copper(II) dihydroxide [Cu(OH)2] solution if 25.25 mL of the solution is titrated to the equivalence point with 36.18 mL of 0.549 M prussic acid [H(CN)]? 2. What volume of a 0.138 M dihydroxyl base solution is needed to neutralize 28.47 mL of 0.745...
*March 29, 2015*

**geometry**

a cylindrical soup can has a volume of 335cm^3.find the dimensions(radius r and height h)that minimise the surface area of such a can.
*February 13, 2014*

**geometry**

elaine and Daniel are building a rectangular greenhouse.they want the are of the floor to be 36metres squared.since the glass walls are expensive,they want to minimise the amount of glass wall they use.they have commissioned you to design a greenhouse which minimizes the cost...
*February 13, 2014*

**Chemistry**

pKb = 8.77 use the Handerson-Hasselbalch equation pOH = pKb + log [C5H5NH+]/ [C5H5N] 1 pOH = 14 - 4.50= 9.50 9.50 - 8.77=0.73 10^0.73 = 5.4 = [C5H5NH+]/ [C5H5N] [C5H5N]/ [C5H5NH+]= 1 / 5.4=0.19
*March 13, 2013*

**Chem**

At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M and [NO]=0.500 M. N2(g) + 02(g) <-> 2NO(g) If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-established?
*March 3, 2013*

**physics**

3.2 m/s^2
*August 29, 2012*

**chemistry**

Why did you divide by .65?
*April 10, 2012*

**Chemistry**

What is the oxidation numbers for ammonia 2NH3
*January 13, 2012*

**arithmetic**

The first term of a quadratic sequence is 8 and it's fourth is 32. If the second difference of the sequence is 2, find Tn.
*March 21, 2011*

**Math**

how to multiply amd simplify of -8/63 x 21/32 x -9/42 = Pleas show work or give examples of simular problems
*February 27, 2011*

**Paralegalism**

A paralegal quits the firm of Johnson & Johnson. When she leaves, she takes client documents she prepared while at the firm. The documents contain confidential client information. The paralegal is showing these documents to potential employers as writing samples. (a) What is ...
*September 26, 2010*

**math**

if two dice are rolled 360 times, approximately how many times should you expect a sum of 7
*May 10, 2010*

**English - Language study**

EDIT: Similary, the calendar is put near the front for quick reference if the reader decides to look at the magazine for upcoming events.
*October 23, 2008*

**English - Language study**

Would it be correct if I added this onto it? These magazines tend to follow this structure because they are very useful pages of magazines. The contents page is put at the front for quick reference and gives the reader an idea of where the articles are. Similary, the calendar ...
*October 23, 2008*

**English - Language study**

I'm doing an assignment on studying the language aspects of children's magazines. I've got my report drafted, and I've recieved written feedback from my teacher, but I'm unsure on how to justify. Here is what I wrote. How is the language structured? From K-...
*October 23, 2008*

**Chemistry - Batteries**

Can someone please help me with finding a website which gives me information on the environmental problems involving the disposal of batteries? I've found the little section on section on Wikipedia, but it's sufficient to write a paragraph in my essay.
*October 14, 2008*

**School Learning Curve**

Can someone explain to me the features of the 'learning curve'. I only just found out that teachers grade people's work against other students in the class, and it's something to do with "scaling", especially in English. I'm just curious on how it...
*September 19, 2008*

**Physics - Projectile Motion**

This is going to be hard to explain, but I did an experiment on projectile motion and we had to lauch a marble from 0 degrees to 90 degrees in a 5 degree interval using a projectile launcher with the same velocity each time. We had to investigate the angle which gave the ...
*September 1, 2008*

**Maths - Reciprocals**

Ivé graphed the function, and would it be correct to say that if the vertex was (1,2), the corresponding feature's coordinates will be (1,1/2), the y coordinates will reciprocals of each other.
*August 26, 2008*

**Maths - Reciprocals**

1. Give an example of a quadtratic whose recirpocal has no vertical asymptotes Ans. y = x^2 - 2x + 3 2. Compare the vertex (or turning point) of the quadratic and the corresponding feature of the reciprocal. Write down your observation. What does the question mean by ...
*August 26, 2008*

**maths reciprocal**

I'm finding difficulty in answering this question. Any help would be appreciated. For the equation, y1= x^-5x+6 and its reciprocal: Discuss what is the consequences for y1 to 1/y1 as x --> +- infinity? Thanks in advance.
*August 24, 2008*

**econ**

If price increases, demand drops. If prices drop, there will be more demand than there is supply, so supply drops.
*August 23, 2008*

**Maths - Graphics Calculators**

Nevermind, I found a Casio Emulator one, but I'm not sure about the legality, so I won't post it. No thanks to Happyface for his short answer "no".
*August 23, 2008*

**Maths - Graphics Calculators**

I need a graphics calculator for my school wok, and I don't have one. Is there a website which I could use one online? or download a graphics calculator program that won't expire?
*August 23, 2008*

**Maths - Recipricals**

I wrote y2 wrong It's suppost to be y2 = 1/(x-3)
*August 23, 2008*

**Maths - Recipricals**

I'm having some torubles understanding these question. Sketch y1 = x-3 and y2 = 1/x-3 on the same set of axis a) What is the relationship between the zero of y1, and vertical asymptote of y2? Does the question mean when y1 = 0?. I know the vertical asymptote is just a ...
*August 23, 2008*

**math problem**

wow I'm surprised on how Ann got the 1/2 symbol on here 0_0
*August 22, 2008*

**econ**

my mind is going blank here..can someone chime in and help: If a new breakthrough in manufacturing technology reduces the cost of producing cd players by half, what will happen to the demand for cd players? Thank you for using the Jiskha Homework Help Forum. It is the "...
*March 25, 2007*

**chemistry**

what is the difference between elements in a group and elements in a period on the periodic table Elements in the same group have similar chemical properties. Element in the same period have properties that change periodically across the table. Check out if the elements of the...
*November 7, 2006*

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