Thursday

October 30, 2014

October 30, 2014

Number of results: 25,803

**Chemistry 1046**

If a sample of Sr-90 initially contains 1.1 mmol of Sr-90, how many millimoles are left after 25.20 years? any ideas on where to start??
*July 3, 2012 by Anonymous*

**statistics 251**

how do i find the standard deviation and sample variance for $7448, $4911, $9051, $6374, $4227
*September 13, 2012 by amirah*

**statistic**

in a random sample of 400 voter, 120 plan to vote for candidate A. determine a 95% confidence interval
*November 1, 2012 by John*

**chemistry**

A 93L sample of dry air is cooled from 145 to-22 under constant pressure.What is the final volume?
*November 25, 2012 by nikki*

**biostatistic**

can we use t-test for two independent sample and dichotomus study with less than five success or failures?
*November 28, 2012 by nono*

**stats**

if i have a sample size of 200, 16% are poor, what is my mean and standard deviation. my answers do not make any sense
*January 1, 2013 by gary*

**Chemistry**

i am not understanding how to solve this how many moles of gas are present in a sample that is at 756 mm Hg pressure, has a volume of 5.3 L, and a temperature of 38 degrees C?
*April 3, 2013 by Angel*

**chemistry**

A 33.0g sample of nitrogen, N2 has a volume of 42.0L and a pressure of 640.mmHg. What is the temperature, in kelvins and degrees Celsius, of the gas?
*April 24, 2013 by John*

**Chemistry**

How many grams of gas are present in a sample that has a molar mass of 70 g/mol and occupies a 2 L container at 117 kPa and 35.1C?
*May 13, 2013 by Dori*

**science **

If you were to conduct an experiment on prayer and healing, what would be the best way to acquire your sample so as to eliminate any bias?
*May 23, 2013 by mordagow*

**chemistry**

A 50g sample of ammonium dichromate is decomposed, what is the milliliter volume of nitrogen gas released at STP?
*June 2, 2013 by Pat*

**8th Grade Physical Science**

Calculate the density of a sample of gas with a mass of 30 g and volume of 7500 cm3.
*October 1, 2013 by kirt*

**Biology**

What would happen if you ran the same sample of DNA as your first experiment but used different primers?
*October 28, 2013 by Help please!*

**Chemistry**

Calculate the % Na2CO3 and % BaCO3 in a 0.2005g sample which requires 28.0mL of 0.9990 N acid for complete neutralization.
*January 20, 2014 by Summer*

**statistic**

6. Which of the following represents the sample space for rolling a six-sided die and tossing a coin? (1 point) {1H, 2H, 3H, 4H, 5H, 6H, 1T, 2T, 3T, 4T, 5T, 6T} *{1, 2, 3, 4, 5, 6} {H, T} {1, 2, 3, 4, 5, 6, H, T}
*March 20, 2014 by TIKIMA*

**Chemistry**

The volume of 3.96g of a gas sample at standard conditions it was found to be 1.15L.Calculate its molecular mass.
*April 13, 2014 by Jaco*

**physical chemistry**

the isotopic abundance of C-12 and c-14 is 98% and 2% by mass respectively. what would be the no. of atoms of c-14 isotope in 12g carbon sample?
*June 18, 2014 by veer*

**Stat**

three identical chips, each with 0 on one side and 1 on the other, are the tossed simunltaneously. a. write the sample space
*June 30, 2014 by cee*

**Statistics**

Find the critical values x2L and x2R that correspond to the given confidence level and sample size. 99%: n=23
*June 30, 2014 by Kasey*

**geometry**

A number is selected at random from the set {2, 3, 4, … 10}. Which event, by definition, covers the entire sample space of this experiment?
*July 24, 2014 by cfd*

**statistics**

there are 450 employee in an organization. using the method of random sampling numbers, select a sample of 20 employees
*September 8, 2014 by Anonymous*

**Chemistry**

How would the empirical formula of copper (II) sulfate be affected if some of the sample sticks to the stirring rod?
*October 20, 2014 by Ashley*

**business statistics**

Please can you give the formula please, A sample of 40 investment customers serviced by an account manager are found to have had an average of $23,000 in transactions during the past year, with a standard deviation of $8500. A sample of 30 customers serviced by another account...
*August 9, 2009 by Heidy*

**Chemistry**

A reaction is said to be diffusion controlled when it occurs as fast as the reactants diffuse through the solution. The following is an example of a diffusion controlled reaction. The rate constant for this reaction is 1.4x1011 M-1s-1 at 25oC and the reaction obeys the ...
*May 19, 2009 by Kevin*

**chemistry**

a patient receives 250 mL of a 4.0% (m/v) amino acid solution twice a day. a) how many grams of amino acids are in 250mL of solution? b) how many grams of amino acids does the patient receive in one day? For a) I came up w/10g and for b) I came up w/ 20g in 1 day. Is this ...
*May 4, 2011 by Connie*

**chemistry**

Benzoic acid and quinine are dissolved in a solution of dichloromethane. Besides the normal neutral forms for benzoic acid and quinine, will there be any other chemical form(s) present in the dichloromethane solution? (benzoic acid pKa = 4.2; quinine pKa = 8.5)
*August 22, 2010 by Kay*

**Chemistry (urgent)**

Hydrolysis of a compound A, C7H6cl2 was carried out by refluxing with excess potassium hydroxide solution. the resulting solution was acidified with dilute HNO3 acid and excess silver nitrate was added to precipitate the chloride ions as silver chloride. 0.718g of silver ...
*October 23, 2014 by Kris*

**Chemistry**

An estimation of the radius of a lead atom: a. You are given a cube of lead that is 1.000 em on each side. The density of lead is 11.35 g/cm3. How many atoms of lead are contained in the sample. b. Atoms are spherical; therefore, the lead atoms in this sample cannot fill all ...
*November 13, 2011 by Arnol*

**chem**

The mass of the CuSO4 x 5H2O sample is 1.664 g. The mass of the recovered copper is 1.198 g. 1. Compute the experimental percent by mass of copper in the sample: 1.1664/1.998x 100=71.81% 2. Calculate the percent copper in pure copper sulfate pentahydrate(this is the ...
*April 13, 2009 by Lou*

**chemistry**

The vapor pressure of pure water at 70°C is 231 mm Hg. What is the vapor pressure depression of a solution of 115 g of the antifreeze ethylene glycol, C2H6O2, a nonvolatile compound, in 205 g of water? Use molar masses with at least as many significant figures as the data ...
*December 12, 2012 by Brad*

**Math- HELP**

How do I Find the first and third quartiles, Q1 and Q3, of the following set of numbers? 13,4,12,16,8,14,8,3,10,8 order the data: 3,4,8,8,8,10,12,13,14,16 Quartile I ends at 8 The quartile II ends at 9. quartile III ends at 13 The calculation of the quartiles is sometimes not ...
*March 4, 2007 by Denim*

**math**

can someone check and see if i did this right An 800 g solution of acid and water contains 128 g of acid. What percent of the solution is acid? 100=128/800*100 128/800=6.25 6.25*100=625
*January 31, 2008 by jj*

**CHEMISTRY**

1) An NaOH solution of unknown concentration is titrated with HCl. 51.9 mL of 0.400 mol/L HCl will neutralize 75.0 mL of the NaOH. What is the concentration of the NaOH solution ? Record your answer in decimal notation. I think the answer is 0.277 mol/L. is that right? 2)An ...
*January 31, 2012 by TIANDRA*

**chemistry**

Consider the reaction HCl + NaOH ->NaCl + H2O Given: HCl Solution: 22 degrees celsius NaOH Solution: 22 degrees celsius Final Temperature: 26.1 degrees celsius A. Calculate the amount of heat evolved when 15 mL of 1.0 M HCl was mixed with 35 mL of 1.0 M NaOH B. Calculate ...
*March 28, 2011 by Vanessa*

**Chem**

At 58.8 degrees C and at a total pressure of 1.00 atm the mole percent of acetone in the vapor state above a solution of acetone and water containing 70. mol % acetone is 87.5%. Assuming the solution to obey Raoult's Law, determine the vapor pressure of pure water at this ...
*March 27, 2007 by Chris*

**math retry**

Is the answer to log sub a 2 = .4, log sub a 3 = .5, log sub a 5 = .8 is it 2.9? Is the answer to log sub 5 (2x+3) = 2 is the correct answer 11? Is the solution to 8^x=16^x+2 is the solution 2? Are you guessing? Something is wrong. Let me see your work. You are missing ...
*January 13, 2007 by Sara L.*

**Science**

A 0.21g sample of sulfuric acid is dissolved completely in sufficient water to make 0.25 litre of final solution. Calculate the hydrogen ion concentration in mol1-1 in this solution and show successive steps in the calculation: If 0.21g in 0.25l then 0.84g in 1l.You multiplied...
*March 12, 2007 by Anthony*

**Statistics**

A reseacher would like to determine whether a change in lighting to full spectrum light bulbs increases productivity on an assembly line. A sample of n= 36 participants is obtained, and the light bulbs over the line are replaced. under general/historical operating procedures, ...
*July 12, 2012 by Christie*

**ap statistics**

A fire insurance company felt that the mean distance from a home to the nearest fire department in a suburb of Chicago was at least 4.7 miles. It set its fire insurance rates accordingly. Members of the community set out to show that the mean distance was less than 4.7 miles. ...
*April 25, 2014 by nicole*

**Math**

Suppose you have two alcohol+water solutions. One solution ( of volume x liter ) is 45% alcohol, while the second solution (of volume y liter) is 75% alcohol. What values of "x" and "y" (in liters) will fill a total volume of 5.0 liter which contains 2.88 liters of alcohol ? I...
*July 26, 2008 by Andrea*

**Chemistry**

Which would react faster with MeI in aqueous solution: OH- or Et3N? I know that the reaction in aqueous solution would be an Sn1 reaction and so steric hindrance wouldn't have such a great effect. I am not sure which is a better nucleophile out of OH- and Et3N. OH- is charged...
*May 26, 2009 by Alice*

**Chemistry**

If 50.00mL of 1.10M NaOH is added to 25.00mL of 1.86M HCl, with both solutions originally at 24.70 degrees Celsius, what will be the final solution temperature? (Assume that no heat is lost to the surrounding air and that the solution produced in the neutralization reaction ...
*October 5, 2012 by Tasnim*

**Chemistry**

A solution is made by dissolving 0.100 mol of NaCl in 5.35 mol of water. What is the mass % of NaCl? So far, I have determined molecular weight of NaCl (58.44 g/mol) multiplied by 0.100 mol = 5.844g NaCl, and mw of H2O (18 g/mol) = 96g H20. I thought mass solute/mass solution...
*March 26, 2010 by Jon*

**Chemistry**

How would each of the following affect the accuracy of the calculated neutralizing power of antacid (too high, too low, or no effect) a. The titration flask was wet with distilled water when the antacid was added. b. The buret was not rinsed with NaOH solution before titrating...
*March 24, 2012 by Darrylnn*

**biology**

My teacher asked quite a few questions, but these are the ones with which I am having trouble...I have re-worded them somewhat for clarity. Can anyone please help me! Thank you! _____________________________________ Methotrexate is a cancer drug that inhibits the enzyme “...
*March 21, 2008 by Elise*

**Low recovery**

The question is: A student performs a crystallization on an impure sample of biphenyl. The sample weighs 0.5g and contains about 5% impurity. Using his knowledge of solubility, he decides to use benzene as a solvent. The final weight is only 0.02g. Why is recovery so low? My ...
*September 26, 2006 by Sheryl*

**chemistry asap!**

I'm having trouble solving this percentage concentration problem: A student wants to make 5.00% solution of rubidium chloride using 0.377g of the substance. What mass of water will be needed to make the solution? [g RbCl2/(g RbCl2 + g H2O)]x100 = 5.00 Solve for g H2O. A day ...
*January 24, 2007 by michelle*

**college algebra**

1. find the equation of the line with the given properties. Express the equation in general form or slope-intercept form. perpendicular to the line -3x_y= -27; contains the point (9, -1) the equation of the line is ? 2. solve the polynomial inequality and then graph the ...
*December 1, 2012 by confused--two questions please help*

**Chemistry/Env Sci**

a)the E0 for the reactions 2HOCl + 2H+ + 2e- → Cl2 + 2H20 and Cl2 + 2e- → Cl- are 1.63 and 1.396 volts respectively. Write the half reaction of HOCl being reduced to Cl- and develop the full pE/pH equation for this reaction. b)What is the pE of a HOCl/Cl- solution ...
*July 31, 2013 by Dave*

**chemistry**

An ideal solution of 5.00 mole benzene and 3.25 mole toluene. At 298 K, the vapor pressure of the pure benzene and toluene were 96. Torr, and 28.9 Torr, respectively. At what pressure does the vapor phase appear first, if the pressure above this solution is reduced from 760 ...
*May 12, 2014 by Anonymous*

**college stats**

Again sorry for all the questions. please help, I am not good at stats and find these questions very difficult. I would appreciate an explanation if possible. 1.What is the sample average? 2.What is the SD of the box? 3.What is the number of draws from the box (the sample size...
*July 12, 2013 by penelope*

**Statistics PLEASE HELP**

1. In a recent election Smith ran against Jones for Governor. A pre-election poll surveyed 1885 randomly selected voters. Of those surveyed 980 indicated that they planned to vote for Smith. The five questions below pertain to the problem of testing the hypothesis that a ...
*April 11, 2009 by Winky*

**math, help**

can someone show me how to do this one i have plenty of them so can you show me step by step when someone gets a chance. Thank you. Solve the system by graphing x+y=3 x+y=-1 What I would do is to put the equations in slope intercept form: y= -x + 3 y= -x -1 Then graph the ...
*February 10, 2007 by jasmine20*

**Sta**

It is pretty common across most schools to find the grades at the MBA level divided between A’s and B’s. As such, you expect the mean GPA to be around 3.50. Using the sample of 200 MBA students, conduct a one-sample hypothesis test to determine if the mean graduate GPA is ...
*March 17, 2012 by Mark*

**CHEMISTRY**

1.Chemistry Question: A 0.1 M solution of acetic acid is titrated with 0.05M solution of NaOH. What is the pH when 60% of the acid has been neutralized? The equilibrium constant (Ka) for acetic acid is 1.8x10^-5 2. Chemistry question: On average, how far is a molecule of air ...
*August 21, 2010 by Gerald*

**statistics**

The value of the z-score that is obtained for a hypothesis test is influenced by several factors. Some factors influence the size of the numerator of the z-score and other factors influence the size of the standard error in the denominator. For each of the following indicate ...
*February 29, 2008 by Tyler*

**math**

Pick a country of your choice that is experiencing population growth. Using the Library, web resources, and/or other materials to find the most recent population count of the country you have chosen and the population growth rate of that country. Use that growth rate to ...
*September 17, 2008 by Anonymous*

**Chemistry**

In the laboratory exercise "Preperation and Properties of Polymers", polyvinyl alcohol is dissolved in water and then reacted with borax (Na2B4O7·10H2O) in water. Which of the following are expected results of this reaction? True or False? 1. Polyvinyl alcohol became graft ...
*April 22, 2011 by Chem*

**Algebra**

f(x)=x/(x+2) and g(x)=4x-2 (A.) Find f of g(1). Is the solution "1/2" correct? (B.) Find g of f of f(2). Is the solution "-6/5" correct?
*November 28, 2009 by C.*

**Chemistry**

I need to find out what the total acid concentration is in Kool-Aid. If 23.3 mL of 0.1043M NaOH neutralize a 60 mL solution of Kool-Aid (10 mL) and water (50 mL), what is the total concentration in a 10.00 mL aliquot of Kool-Aid? If you prepared a standard 250 mL serving by ...
*February 15, 2011 by Julie*

**Statistics**

For this assignment you are to imagine that you are part of a select marketing group. This select group has been asked to consider the Colorado City Convention and Visitors Bureau survey of 25 hotels in the local area. The survey is concerned with the current availability of ...
*May 5, 2012 by Angela*

**Bio (please help me, important)**

In my bio lab we are creating serial disk dilutions (100mg, 300mg, 500mg) from a plant extraction sample. Wood sample #1 (7mL of hexane) Hexane 0.6651g so .6651g of the plant was dissolved in 7mL of hexane. Then I did dilution calculations so 0.6551g/7 mL = 0.095g/ml so I ...
*January 3, 2007 by Ali*

**Inter. Algebra**

Another problem plz help Count Iblis. How do you solve 5/x+2 + 2x/x squared - 4= 3/x-2? 5/x+2 + 2x/x squared - 4= 3/x-2 You write the term: 2x/x squared as 2/x the equation becomes: 5/x+2 + 2/x - 4= 3/x-2 4/x = 0 This equation has no solutions. It is only satisfied in the ...
*December 2, 2006 by Andrea*

**Chemistry**

Use Henry's law and the solubilities given below to calculate the total volume of nitrogen and oxygen gas that should bubble out of 1.6 L of water upon warming from 25 C to 50 C. Assume that the water is initially saturated with nitrogen and oxygen gas at 25 C and a total ...
*September 17, 2009 by RE*

**math**

A sample of 148 of our statistics students rated their level of admiration for Hillary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06, and the standard deviation was 1.70. (For this exercise, treat this sample as the entire population of interest.) a. Use these ...
*October 12, 2013 by eid2013*

**math **

A sample of 148 of our statistics students rated their level of admiration for Hillary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06, and the standard deviation was 1.70. (For this exercise, treat this sample as the entire population of interest.) a. Use these ...
*October 14, 2013 by eid2013*

**chemistry**

As you saw in Part B, the vapor above the cyclohexane-acetone solution is composed of both cyclohexane vapor and acetone vapor. What mole fraction of the vapor above the solution, X(cy) vapor), is cyclohexane?
*February 8, 2011 by me*

**chemistry**

1. Calculate the volume of carbon dioxide at 273 K and 1.01 * 10^5 Pa which would be produced when 1.25g of calcium carbonate reacts completely with HCL. and 2. When 41.18 cm^3 of a solution of silver ions with concentration of .2040 mol dm^-3 is added to a solution of XO4 -3 ...
*May 19, 2008 by ANn*

**chemistry**

Concentrated hydrochloric acid is a 38% solution of hcl in water and has a density of 1.18g/ml. How many milliliters of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 hcl solution? My calculation 500ml x 1:200 =2.5 1:200 means 1gm/200ml 2.5 x 36.5 = 91....
*August 9, 2012 by Fai*

**chemistry**

a student mixes 4 reagents together thinking that the solution will neutralize each other . The solution is mixed together are 50 ml of 0.100 M of HCL and 100 ml of 0,200 M of nitric acid 500 ml of 0.0100 M ca hydroxide and 200 ml of 0.100 M rubidium hydroxide . Did the acid ...
*September 27, 2014 by mathew*

**Statistics**

1. Suppose the distribution of birth weights of babies born at Big General Hospital is normal. If the mean weight is 7.5 lb. and the standard deviation is 1.25 lb, about 50% of the babies will weight between.... 2. Joe runs a carnival game in which he charges $2 for a player ...
*April 26, 2012 by Linda*

**Solving Two-Step Equations for Reiny or Steve~!**

1) Which of the following is a solution to the equation y=3x-1? (4,1)*** (2,5) (4,3) (0,-3) 2) Which equation represents the pattern in the table below? (Sals and Carrie’s Ages) Sal 3 5 8 13 15 Carrie 7 9 12 17 19 S=c+4*** S=4c C=s+4 C+4s 3) Solve. 1/3x=12 X=4 ...
*September 23, 2013 by Gabby*

**Chemistry**

In concentrated aqueous solutions of NaCl, the Na+ (aq) ions can be so close to the Cl- (aq) ions that a small percentage is associated in ion pairs at any given moment. Suppose that a solution contains 1.00 mol of NaCl and that 5.57% of the formula units exist in solution as ...
*May 2, 2007 by Mike*

**chemistry**

Caclulate the Ka of nitrous acid if a 0.200 mol/L solution at equilibrium at SATP has a percent ionization of 5.8% ka=(H+)(NO2-)/(HNO2-) If 1.59% ionized then after ionization H+ = 0.2 x 0.058 =? NO2- = 0.2 X 0.058=? HNO2=0.2 x (1.0 - 0.058) If solution is 5.8% ionized, than ...
*April 7, 2008 by Dustin*

**Algebra Help PLEASE**

King’s Service Station uses two kinds of cleaning solution containing acid and water. “Attack” is 2% acid and “Blast” is 6% acid. They want to mix the two to get 60qt of a solution that is 5% acid. How many quarts of each should they use. Let a = number of quarts of "Attack" ...
*May 8, 2008 by Kell*

**Chemistry**

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 235 torr. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature. What is the mole fraction composition of the mixture?
*February 11, 2013 by Emma*

**math**

Determine all the possible values of x where 0 deg is more than or equal to x and x is more or equal to 360 deg such that i'm not sure the solution, please correct it and how to find the x value, 2 tan x - 1 = cot x solution: (sec x -1)(sec x + 2) = 0 sec -1 = 0 , sec x + 2 = ...
*April 15, 2013 by choi2463*

**algebra**

Can someone PLEASE explain how to do this to me? Thank you so much! Ten gallons of a 30% acid mixture is obtained by mixing a 50% solution (X) with 20% solution (Y). Write an equation for the 10 gallon mixture. What is the acid concentration, in gallons, of the final mixture? ...
*October 28, 2010 by Holly*

**chemistry**

A solution contains 10.05 grams of an unknown covalent substance in 50.0 grams of water. The freezing point of this solution is (-) 3.16o C. What is the formula weight of the unknown compound? Below is what I tried, but don't know what to do next. Please explain step-by-step. ...
*October 11, 2013 by Anonymous*

**chemistry**

A 25 mL solution of nitric acid was placed in a flask and a few drops of phenolphthalein were added. Dilute sodium hydroxide was added util the indicator changed colour. It was found that 28 mL of the alkali was used. (a) What colour was the solution in the flask at the start ...
*August 7, 2014 by Shane*

**MATH 116**

• How do you know when an equation with one variable has infinitely many solutions? • How do you know when an equation with one variable has no solution? • How do you know when an equation with one variable has one solution? • Give an example of each type of equation?
*September 13, 2010 by TONY*

**chemistry**

what are the hydronium-ion and the hydroxide ion concentration of a solution at 25 C that is 0.0050 M strontium hydroxide, Sr(OH)2? a solution of hydrochloric acid is 0.20 M HCl. What is the hydronium-ion at 25 C? What is the hydroxide ion concentration at 25 C?
*August 6, 2011 by Henry*

**Chemistry**

A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 15.00% naphthalene by mass. Calculate the vapor pressure at 25 ∘C of hexane above the solution. The vapor pressure of pure hexane at 25 ∘C is 151 torr. I keep getting 168 torr...
*September 20, 2014 by Kaitlyn*

**chemistry**

NH4NO3(s) NH4+(aq) + NO3−(aq) In order to measure the enthalpy change for this reaction above, 1.07 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8°C and the final temperature (after the solid dissolves) is 22.4°C. ...
*November 16, 2012 by DeeDee*

**Calculus**

Using 3(x-3)(x^2-6x+23)^1/2, as the chain rule differentiation of f(x)=(x^2-6x+23). Please explain how I find the general solution to the differential equation dy/dx= 2/27(x-3)SQUARE ROOT BEGINS (x^2-6x+23)/y SQUARE ROOT ENDS (y>0). In implicit form I have an answer of 18*y...
*May 12, 2011 by Tony*

**Chemistry - Solution Stoichiometry**

A piece of nickel is placed in a beaker with 350 mL of copper (II) sulfate. Calculate the concentration of the copper (II) sulfate solution. Initial mass of nickel - 15.5 g Final mass of nickel - 11.4 g What do i do with the final and initial masses of nickel?
*April 2, 2008 by Michelle*

**Chemistry**

Determine the pH of the following solutions: a) A 250.0 mL solution that contains 0.125 M benzoic acid and 0.147 M sodium benzoate. b) The solution in part (a) after 30.0 mL of 0.510 M hydrochloric acid has been added. a. Ka = 6.3 x 10^-5 pKa = 4.20 pH = pKa+log(base/acid) pH...
*July 15, 2014 by Arthur T*

**Statistics**

(25 pts, 5 pts each) The ounces of coffee that a machine dispenses in 5-ounce cups have normally distributed. Suppose a sample of size 6 was taken from this machine, as shown as follows: 5.05 5.03 5.10 5.02 4.98 5.00 (for all calculations, keep at least six decimal places) (1...
*May 9, 2014 by Trell *

**algebra II**

How do you know if a quadratic equation will have one, two, or no solutions? How do you find a quadratic equation if you are only given the solution? Is it possible to have different quadratic equations with the same solution? Explain. Provide your classmate’s with one or two ...
*October 7, 2008 by Nadia*

**algebra II**

How do you know if a quadratic equation will have one, two, or no solutions? How do you find a quadratic equation if you are only given the solution? Is it possible to have different quadratic equations with the same solution? Explain. Provide your classmate’s with one or two ...
*June 15, 2010 by hollywood*

**FlunkyJunkie**

Calculate the volume (mL) of the solute (CH3)2CO and the volume (L) of the solvent H2O that should be added to prepare 1.36 kg of a solution that is 25.7 g (CH3)2CO per 100. g solution. Molar Mass (g/mol) (CH3)2CO 58.05 H2O 18.015 Density (g/mL): (CH3)2CO 0.7899 H2O 0.9982 ...
*February 14, 2010 by Jackie*

**chemistry**

Calculate the volume (mL) of the solute (CH3)2CO and the volume (L) of the solvent H2O that should be added to prepare 1.36 kg of a solution that is 25.7 g (CH3)2CO per 100. g solution. Molar Mass (g/mol) (CH3)2CO 58.05 H2O 18.015 Density (g/mL): (CH3)2CO 0.7899 H2O 0.9982 ...
*February 14, 2010 by Jackie*

**Chemistry**

A 1.250 g mass of standard aspirin is dissolved in approximately 20 mL of 1 M NaOH. This solution is added to a 250-mL volumetric flask and diluted to the mark with DI water. How many grams per mL of aspirin are in the resulting solution? (Note that a 250-mL volumetric flask ...
*January 26, 2014 by Anonymous *

**Chemistry**

can anyone help me on my chemistry problem. i need a merck index to solve this. i have a PH of 10.7 and the nearest solution that is near to it is 10.32. The solution that is 10.32 is NaHCO3. i subtract both of them to get the ratio of log (HA)/(A-). i took that value to the ...
*October 18, 2007 by Chris*

**Biology**

Describe how a sample of whole chloroplasts could be obtained from leaf tissue please could someone point me in the right direction
*September 27, 2007 by Sam*

**chem-calorimetry**

what approach do you suggest using to prevent your water sample from cooling off beore you start your measurements?
*March 31, 2008 by natash*

**Organic Chemistry**

A sample of isoborneol prepared by reduction of camphor was analyzed by IR and showed a band at 1750 cm-1. This result was unexpected. Why?
*July 21, 2008 by Caleb*

**Stat**

the teacher wants me to make a survey questions about a sample and get a statistical data from it, how? including variance and standard deveriation. thanks
*December 30, 2008 by Omar*

**chemistry**

a 50.0 ml sample of water is heated to its boiling point. how much heat (in KJ) is required to vaporize it? (assume a density of 1.00g/ml).
*February 7, 2009 by reese*

**english**

I really dont have a question, but can you give me an example or sample of an outline of a historical person for a research paper.
*March 20, 2009 by beth*

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