Saturday

April 19, 2014

April 19, 2014

Number of results: 7,876

**Chemistry**

A 100.0 mL aliquot of 0.100 M weak base B (pKb=5.00) was titrated with 1.00 M HClO4. Find the pH at the following volumes of acid added Va= 0, 1, 5, 9, 9.9, 10, 10.1, and 12mL
*Wednesday, November 14, 2012 at 12:03pm by Missy*

**Analytical Chemistry**

What is the cell voltage when the following volumes of 0.680 M NaBr have been added? (b) 1.0 mL (c) 13.2 mL (d) 24.7 mL (e) 25.6 mL (f) 26.0 mL (g) 38.9 mL (h) 51.4 mL (i) 52.0 mL
*Thursday, April 11, 2013 at 5:51am by Micki*

**Chemistry **

25cm^3 of a gas containing only nitrogen and oxygen decomposed to form 25cm^3 of nitrogen and 50cm^3 of oxygen. All the volumes were measured at the same temperature and pressure. Write an equation for the reaction.
*Sunday, October 13, 2013 at 9:25pm by Cindy*

**Chemistry**

A 100.0 mL aliquot of 0.100 M weak base B (pKb=5.00) was titrated with 1.00 M HClO4. Find the pH at the following volumes of acid added Va= 0, 1, 5, 9, 9.9, 10, 10.1, and 12mL
*Wednesday, November 14, 2012 at 12:03pm by Asylkhan*

**chemistry**

1.29 m means 1.29 moles/kg solvent. molar mass acetone about 58 molar mass ethanol about 46 You need to redo all of this since I've estimated some of these numbers. Take enough solution to have 1.29 moles which means you take 1 kg solution. 1.29 x 58 = about 75 grams acetone. ...
*Thursday, January 20, 2011 at 8:51pm by DrBob222*

**Geometry**

Determine whether each statement is always, sometimes, or never true. Two cones are similar. A pyramid is similar to a square. Two spheres with the same radius are congruent. Non-similar solids have different volumes.
*Thursday, April 14, 2011 at 8:53pm by Need Help*

**Chemistry**

A sealed flask containing 1.0 mole of H (g) and a sealed flask containing 2.0 moles of He(g) are at the same. 2 temperature. The two gases must have equal 1. masses 2. volumes 3. average kinetic energies 4. numbers of molecules
*Sunday, April 12, 2009 at 4:51pm by .*

**Chemistry**

The coefficients of a balanced chemical equation indicate the relative number of _______ of the reactants and products. All stoichimetric calculations begin with a _______. Only ______ and ______ are conserved iin every reaction; moles, volumes, and representative particles ...
*Wednesday, April 4, 2007 at 12:17pm by Bryan*

**Chemistry**

I need help with this problem: 50.0 mL of 4.4 g/L AgNO3 is added to a coffee-cup calorimeter containing 50.0 mL of 4.4 g/L NaI, with both solutions at 25Â°C. a).What is Î”Tsoln (assume the volumes are additive and the solution has the density and specific heat capacity of ...
*Monday, October 13, 2008 at 3:44pm by CJ*

**CHEMISTRY**

A buffer that is 0.271 M in acid, HA, and 0.150 M in the potassium salt of its conjugate base, KA, has a pH of 2.85. What is the pH of the buffer after 130. mL of 0.155 M LiOH is added to 0.650 L of this buffer? Assume that the volumes are additive.
*Wednesday, September 21, 2011 at 2:47pm by Rachel *

**CHEMISTRY**

A buffer that is 0.271 M in acid, HA, and 0.150 M in the potassium salt of its conjugate base, KA, has a pH of 2.85. What is the pH of the buffer after 130. mL of 0.155 M LiOH is added to 0.650 L of this buffer? Assume that the volumes are additive.
*Wednesday, September 21, 2011 at 2:48pm by Rachel *

**Chemistry**

A sealed flask containing 1.0 mole of H2(g) and a sealed flask containing 2.0 moles of He(g) are at the same temperature. The two gases must have equal 1. masses 2. volumes 3. average kinetic energies 4. numbers of molecules
*Sunday, April 12, 2009 at 4:51pm by .*

**Chemistry**

A sealed flask containing 1.0 mole of H2(g) and a sealed flask containing 2.0 moles of He(g) are at the same temperature. The two gases must have equal 1. masses 2. volumes 3. average kinetic energies 4. numbers of molecules
*Sunday, April 12, 2009 at 6:10pm by .*

**Math**

hint: The volumes of the two similar boxes are proportional to the cubes of their corresponding sides. so the larger box:smaller box = 27:8 so the larger holds over 3 times as much as the smaller. Now look at the cost.
*Wednesday, December 16, 2009 at 10:37pm by Reiny*

**chemistry**

If you filled up three balloons with equal volumes of hydrogen, argon, and carbon dioxide gas all at the same temperature and pressure, which balloon would weigh the most? which balloon would weigh the least?
*Sunday, April 22, 2012 at 4:35pm by akboyer31*

**Physics**

Two metal blocks are attached by a cable as shown in the figure below and are submerged at rest near the surface of a lake. If the volumes are V1 = 2.1 m3 and V2 = 1.1 m3, what is the total buoyant force on the two blocks?
*Wednesday, July 25, 2012 at 10:15pm by Sierra*

**science**

A 60.0-mL 0.508 M glucose (C6H12O6) solution is mixed with 115.0 mL of 2.43 M glucose solution. What is the concentration of the final solution? Assume the volumes are additive.
*Sunday, February 27, 2011 at 3:36pm by Kiana*

**Chemistry**

Calculate the molarity of the HCl from the volumes of acid and base at equivalence point and the molarity of the NaOH. L HCl=0.025 L NaOH=0.06705 NaOH moles M=0.015000
*Wednesday, February 20, 2008 at 9:22pm by Brad*

**Chemistry **

A 60.0ml 0.513M glucose solution is mixed with 120.0ml of 2.33 M glucose solution. What is the concentration of the final solution. assume volumes are additive.
*Saturday, March 13, 2010 at 2:04pm by Adam*

**Lab math**

I have never used a Neubauer chamber. I looked through some of the google articles and found three, all of which differed in size and number of counting squares as well as volumes of each counting square. Since they weren't standard the articles didn't make sense to me.
*Wednesday, August 7, 2013 at 10:28pm by DrBob222*

**Chemistry-Dr. Bob**

Does this help? Calculate the molarity of the HCl from the volumes of acid and base and the molarity of the NaOH. L HCl=0.025 L NaOH=0.06705 NaOH M=0.015000
*Wednesday, February 20, 2008 at 9:22pm by Brad*

**Chemistry**

c1v1 = c2v2 c = concn v = volume Then subtract the 25.0 mL to find volume that must be added. And the volume that must be added is IF the volumes are additive.
*Monday, April 23, 2012 at 11:37am by DrBob222*

**math**

A pitcher knows how to throw five different pitches. He threw four pitches before the last batter was called out. a) assuming he threw each pitch at LEAST once, determine the number of possible arrangements of his pitches. b) assuming that he can use any pitch an unlimited ...
*Friday, May 20, 2011 at 7:47pm by sonjay*

**chem 121**

what volumes of the folowing concentrated solutions are required to prepare solutions of the final concentrations indicated (a) 12MH2SO4 to prepare 2.0 L 0f 1.5 MH2SO4 (B)2.0 MKCIto prepare 200ML 0f 0.5MKCI
*Friday, July 2, 2010 at 7:27pm by ngugi*

**intro to chemistry**

The air in a 5.00L tank has a pressure of 1.20atm. What is the new pressure of the air when the air is placed in tanks that have the following volumes, if there is no change in temperature? A. 1.00L B. 2500ml C. 750ml
*Monday, October 11, 2010 at 9:06am by david*

**Physics please help!**

An object is moving along a straight line and the uncertainty in its position is 1.1 m. (a) Find the minimum uncertainty in the momentum of the object. (b) Find the minimum uncertainty in the object's velocity, assuming that the object is a golf ball (mass = 0.045 kg). (c) ...
*Saturday, April 21, 2012 at 12:43pm by linds*

**Solid Mensuration**

bigV/smallV = 81/2 / 12 = 81/24 = (3/2)^3 volumes are in the ratio x^3:1 if the sides are in ratio x:1 so, bigH/smallH = 3/2 so, 7.5/smallH = 1.5, and smallH = 5
*Friday, March 2, 2012 at 5:26am by Steve*

**Science (urgent)**

Assuming you meant an arrow instead of a "Reserved" sign, it should be B, Product. The substrate is something being acted upon in a reaction (I'm assuming this is for a biology/biochemistry class, so in that case the substrate is what's being acted on by the enzyme). An enzyme...
*Wednesday, October 26, 2011 at 3:13pm by Peter*

**CALCULUS**

A PIECE OF SHEET METAL IS 2.6 TIMES AS LONGS AS IT IS WIDE. IT IS TO BE MADE INTO A BOX WITH AN OPEN TOP BY CUTTING 3-INCH SQUARES FROM EACH CORNER AND FOLDING UP THE SIDES. IF THE VOLUME OF THE BOX MUST BE BETWEEN 600 AND 800 CUBIC INCHES, WHAT VALUES OF X WILL PRODUCE THIS ...
*Thursday, July 24, 2008 at 8:48pm by diana*

**chemistry**

If a solution of 0.10 M silver nitrate, AgNO3, is slowly added to a solution containing 0.010 M potassium iodate, KIO3, and 0.20 M sodium bromate, NaBrO3, what precipitate will form first. Will this precipitate form nearly completely (99%) before the second precipitate starts ...
*Wednesday, September 13, 2006 at 2:21pm by bria*

**math**

how do i use the shell method to find the volumes of the solids generated by revolving the regions bounded by the curves and lines a) y=1/x, y=0, x=1/2, x=2 So I think the integral is 2pi(radius)(height) dx from 0.5 to 2 but I'm not sure what the radius and height would be. ...
*Wednesday, March 24, 2010 at 7:10pm by ciara*

**Chemistry**

If 25.0mL of sodium nitrate solution (0.100mol/L) is added to 10.0mL of sodium carbonate solution (0.150 mol/L), what is the concentration of sodium ions in the resulting mixture? Assume the volumes are additive.
*Wednesday, May 13, 2009 at 10:34pm by Tom*

**Chemistry**

A student did not fully mix the solution of Oxalic Acid in the volumetric flask predict and explain the effect of the range of the students titration volumes when using the NaOH solution to titrate the Oxalic Acid solution
*Thursday, December 2, 2010 at 11:39pm by andrea *

**Chemistry**

Two natural gas storage tanks, with volumes of 1.5 x 104 and 2.2 x 104L, are at the same temperature. The tanks are connected by pipes that equalize their pressures. What fraction of the stored natural gas is in the larger tank? I have no idea how to go about this. Thank you!
*Monday, May 17, 2010 at 1:14pm by Michael*

**AP Chemistry- Equilibrium**

If 10.0 mL of 0.18 M MgCl2 are mixed with 20.1 mL of 0.56 M NaOH, what will be the final concentration of Mg2+ in solution when equilibrium is established? Assume the volumes are additive. Ksp = 1.2 ✕ 10-11 for Mg(OH)2.
*Sunday, February 9, 2014 at 6:39pm by Danielle*

**AP Chemistry- Equilibrium**

If 10.0 mL of 0.18 M MgCl2 are mixed with 20.1 mL of 0.56 M NaOH, what will be the final concentration of Mg2+ in solution when equilibrium is established? Assume the volumes are additive. Ksp = 1.2 ✕ 10-11 for Mg(OH)2.
*Sunday, February 9, 2014 at 6:39pm by Danielle*

**Microeconomics**

Suppose rampant fears of Mad Cow disease cause a decrease in demand for beef. What will be the short-run effects of the declining demand for beef on the firm and the market? What will be the long-run effects? Explain in words and graphs. ---Try this first assuming the beef ...
*Thursday, June 29, 2006 at 5:03pm by Jarmisha*

**Biochemistry **

What volumes of 25 mM CH3COOH and 25 mM NaCH3COO are required to prepare 300 mL of a 0.25 M buffer of pH = 5.0? (pKa = 4.76) I keep getting something along the lines of 19ml for the conj. base..I know thats way wrong. help please!
*Saturday, September 10, 2011 at 9:35pm by DanV*

**math30**

8 is 1/4 of 32, so two half-lives = 21 hours. half-life is 10.5 hours 4^(8x-1) = (2^2)^(8x-1) = 2^(16x-2) = 8 = 2^3 so, 16x-2 = 3 x = 5/16 assuming 1/27x = (1/27)*x, 3^(2x-5) = (3^-3)x (2x-5)log3 = -3log3 + logx (2x-2)log3 = logx nope assuming a typo, and the x on the right ...
*Tuesday, July 3, 2012 at 4:16am by Steve*

**A.P. Chemistry**

You have solutions of 0.200 M HNO2 and 0.200 M KNO2 (Ka for HNO2 = 4.00 10-4). A buffer of pH 3.000 is needed. What volumes of HNO2 and KNO2 are required to make 1 liter of buffered solution?
*Saturday, April 3, 2010 at 4:31pm by Oli*

**Chemistry**

The 2.5 M HCl is the diluting agent and has nothing to do with the calculation for the dye. (Another way of saying it is that the 2.5 M HCl is just water as far as the dye dilution is concerned.). My MV = MV gets 2 mL. The HCl is 2.5 x (1.6/2.0) = ?? if we assume the volumes ...
*Thursday, June 24, 2010 at 3:42am by DrBob222*

**Physics**

A block of wood is compressed 2.0 nm when inward forces of magnitude 120N are applied to it on two opposite sides. (a) Assuming Hooke's law holds, what is the effective spring constant of the block? (b) Assuming Hooke's las still holds, how much is the same block compressed by...
*Saturday, March 26, 2011 at 4:12pm by Work needed!*

**Chemistry**

A solution is prepared by mixing 13.00 ml of .0021 M aqueous Hg2(NO3)2 with 25 ml of .015M HCL. Assme that volumes are additive. a) Will precipitation occur? b) Calculate [HG2 2+], [CL-], and [NO3] after equilibrium is established.
*Thursday, April 8, 2010 at 1:32pm by Anmol*

**MATH HELP: Volumes of Pyramids and Cones**

This is my last question in Math. :p 9. Find the volume of a rectangular prism with the following dimensions: Length = 5 mm Base = 7 mm Height = 3 mm a. 142 mm^3 b. 105 mm^3 c. 126 mm^3 d. 130 mm^3
*Tuesday, February 19, 2013 at 2:26pm by Batman*

**chemistry**

analysis of a mixture of carbonate and bicarbonate: I did an experiment where 2.306g of unknown was diluted with distilled water to 250ml. Then 3 25mL samples of this unknown were titrated with .0663 M HCl and end point volumes were: 41.12mL, 41.00mL and 40.99mL. Then 3 more ...
*Wednesday, September 25, 2013 at 10:03am by martini*

**math**

It does not matter the shape as long as the two objects have the same shape. The ratio of their volumes is the scale ratio cubed. (by the way the ratio of any equivalent areas on them is the scale ratio squared)
*Sunday, December 14, 2008 at 2:15pm by Damon*

**algebra**

Let the quadratic equation be x²+bx+c=0 which factorizes to (if factorizable) (x-p)(x-q)=0 This means that pq=c, and p+q=-b where p,q are the solutions to the equation. If the constant term was misread, and assuming the coefficient of x was correctly read, then -b=(8+2), ...
*Monday, October 10, 2011 at 12:35pm by MathMate*

**geometry**

The Volumes of two similar figures are given. The surface area of the smaller figure is given. Find the surface area of the larger figure. V= 27m^3 V= 64m^3 S.A.= 63m^2
*Wednesday, April 6, 2011 at 6:20pm by Mr. Moo*

**geometry**

The volumes of two similar figures are given. The surface area of the smaller figure is given. Find the surface area of the larger figure. V = 8ft^3 V = 125ft^3 S.A. = 4ft^2
*Wednesday, April 13, 2011 at 9:43pm by pj*

**math**

A solid cone is cut into two parts by a plane parallel to the base and 3/5 of the height of the cone above the base. Find the ratio of the volumes in the two parts.
*Sunday, May 13, 2012 at 11:22am by My Name Is Bob*

**Chemistry**

How would you determine the concentration of H+, H2A and MB+ in a solution containing volumes of: H+ 600 microliters H2A 500 microliters MB+ 100 microliters H20 800 microliters
*Sunday, November 18, 2012 at 8:04pm by Cristian*

**ALGEBRA**

Suppose that the volumes of four stars in the Milky Way are 2.7 × 1018 km3, 6.9 × 1012 km3, 2.2 × 1012 km3, and 4.9 × 1021 km3. What is the order of the stars from least to greatest volume?
*Wednesday, March 24, 2010 at 11:05pm by Anonymous*

**Chemistry**

When hydrogen selenide gas reacts with oxygen, selenium dioxide and steam are produced. How many liters of selenium dioxide would be produced from 5.50 L of oxygen? Assume 90% yield and that all gases are measured at the same temperature and pressure. Balance the equation: ...
*Sunday, October 15, 2006 at 9:08pm by Anonymous*

**CHEM - mole fractions**

the vapour pressure of pure water at 110 degrees is 142.7kpa. a solution of ethylene glycol and water has a vapour pressure of 101.3kpa at 110 degrees. assuming that raoults law is obeyed, what is the mole fraction of ethylene glycol in the solution? I get confused when they ...
*Friday, October 8, 2010 at 3:47am by lucylu*

**Algebra 2**

The radius of a right cylinder is 15 inches and its height is 6 inches. What single amount can be added to either the radius or the height so that the volumes will increase the same amount?
*Tuesday, November 22, 2011 at 11:02pm by unanimous*

**bio**

if you had two fish in two seperate containers with different volumes (a-more water and b- less water)which container would have more oxygen available to the fish when first introduced
*Monday, October 13, 2008 at 3:53pm by Anonymous*

**math**

A wooden pyramid, 12 inches tall, has a square base. A carpenter increases the dimensions of the wooden pyramid by a factor of 5 and makes a larger pyramid with the new dimensions. Describe in complete sentences the ratio of the volumes of the two pyramids.
*Tuesday, March 6, 2012 at 2:18pm by Cindy*

**geometry**

A wooden pyramid, 12 inches tall, has a square base. A carpenter increases the dimensions of the wooden pyramid by a factor of 5 and makes a larger pyramid with the new dimensions. Describe in complete sentences the ratio of the volumes of the two pyramids.
*Thursday, March 8, 2012 at 12:45pm by Kayla*

**chemistry**

A 1.04-L sample of gas at 759 mmHg pressure is expanded until its volumes is 2.24 L. What is the pressure in the expanded gas sample (at constant temperature)?
*Tuesday, February 14, 2012 at 11:16pm by Amy*

**Chemistry**

59.0 mL of a 1.80 M solution is diluted to a total volume of 268 mL. A 134-mL portion of that solution is diluted by adding 171 mL of water. What is the final concentration? Assume the volumes are additive.
*Tuesday, March 19, 2013 at 9:49pm by Robert*

**chemistry**

53.0 mL of a 1.50 M solution is diluted to a total volume of 258 mL. A 129-mL portion of that solution is diluted by adding 195 mL of water. What is the final concentration? Assume the volumes are additive.
*Tuesday, March 26, 2013 at 10:27pm by Jen*

**chemistry**

59.0 mL of a 1.40 M solution is diluted to a total volume of 278 mL. A 139-mL portion of that solution is diluted by adding 129 mL of water. What is the final concentration? Assume the volumes are additive.
*Wednesday, April 17, 2013 at 6:09pm by lee*

**Chemistry **

77.0 mL of a 1.20 M solution is diluted to a total volume of 288 mL. A 144-mL portion of that solution is diluted by adding 155 mL of water. What is the final concentration? Assume the volumes are additive.
*Friday, May 10, 2013 at 5:42pm by Gmp*

**Chemistry**

A 30.00mL sample of 0.150M KOH is titrated with 0.125M HClO4 solution. Calculate the pH after the following volumes of acid have been added: 30.0 mL, 35.0 mL, 36.0 mL, 37.0 mL, 40.0 mL
*Thursday, November 17, 2011 at 4:12pm by Shana*

**Analytical Chemistry**

Consider the titration of 100.0 mL of 0.100 M NaOH with 1.00 M HBr. Find the pH at the following volumes of acid added and make a graph of pH versus Va: Va = 0,6 and 12 mL
*Saturday, December 1, 2012 at 3:37pm by canas*

**Chemistry- dilution**

51.0 mL of a 1.20 M solution is diluted to a total volume of 248 mL. A 124-mL portion of that solution is diluted by adding 125 mL of water. What is the final concentration? Assume the volumes are additive.
*Sunday, October 13, 2013 at 1:51pm by Chelsea*

**math (algebra honors)**

The edge of one cube is 2 cm shorter than the edge of a second cube. The volumes of the two cubes differ by 386 cm^3. Find the edge of the smaller cube using factoring.
*Sunday, February 27, 2011 at 5:52pm by K.S.*

**statistics**

The volumes of soda in quart soda bottles are normally distributed with a mean of 32.3 oz and a standard deviation of 1.2 oz. What is the probability that the volume of soda in a randomly selected bottle will be less than 32 oz?
*Monday, March 31, 2014 at 7:13pm by olivo*

**chemistry**

When a solution is diluted with water, the ratio of the initial to final volumes of solution is equal to the ratio of final to initial molarities. true or false?
*Wednesday, March 9, 2011 at 5:32pm by KRisten*

**Chemistry**

A 30 mL sample of 0.150 M KOH is titrated with 0.125 M HClO4 solution. Calculate the pH after the following volumes of acid have been added: 30 mL, 35 mL, 36 mL, 37 mL, and 40 mL.
*Tuesday, March 8, 2011 at 11:43pm by Melissa*

**Chemistry**

A 30 mL sample of 0.150 M KOH is titrated with 0.125 M HClO4 solution. Calculate the pH after the following volumes of acid have been added: 30 mL, 35 mL, 36 mL, 37 mL, and 40 mL.
*Tuesday, March 8, 2011 at 11:49pm by Melissa*

**chemistry**

The density of aluminum is 2.70g/cm3 and the density of chromium is 7.19g/cm3. If eual masses of aluminum and chromium are transferred to equal volumes of water in separate cylinders, which cylinder would have the greates volume change.
*Monday, September 7, 2009 at 1:59pm by Anonymous*

**Physics**

A vertical spring with a spring constant of 450 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed by 3.0 cm in bringing the block to a momentary...
*Wednesday, April 4, 2007 at 8:54pm by Mary*

**measurements**

V (Cylinder) = pi * r^2 * h V (cone) = 1/3 * pi * r^2 * h Since volumes are = : pi * r^2 * h = 1/3 * pi * r^2 * h Since pi and r^2 are the same values, dividing both sides by these terms will cancel them out. What does that tell you about the heights? Are they the same? I hope...
*Sunday, February 7, 2010 at 6:30pm by PsyDAG*

**Chemistry**

If you determine the volumes of these three ionic compounds, NaCl has the greatest volume. AlCl3--Has four ions MgCl2--has 3 NaCl-has 2 Salt can hold more Na+ to Cl- collisions. which form ionic compounds since there is a greater volume.
*Wednesday, August 31, 2011 at 7:42pm by ALISON*

**college chemistry**

Calculate the % empty space in 1 mole of water at 25 degree C (d=0.9971g/ml). The volume of a water molecule can be taken as the sum of the volumes of the 2 hydrogen molecules and the oxygen atom. Use the single bonded covalent radii of 37pm for hydrogen and 66pm for oxygen.
*Tuesday, February 3, 2009 at 9:23pm by christy*

**chemistry college**

Consider the titration of 30.0 mL sample of 0.050 M NH3 with 0.025 M HCl. Calculate the pH after the following volumes of titrant (acid)have been added: a)0 mL, b)20.0mL, c)60.0mL, d)65mL Kb for NH3 is 1.8 x 10^-5
*Wednesday, December 4, 2013 at 5:33pm by Taylor M*

**Chemistry;HELP**

Do you have any ideas? For #1. you can treat volumes of gases as if they were mols; therefore, volume O2 required = 500 x (3 mols O2/2 mols O2) = 500 x 3/2 = ?
*Wednesday, August 21, 2013 at 1:52pm by DrBob222*

**Chemistry **

calculate the ph 25.00 mL solution of 0.125 M acetic acid (Ka= 1.75 x 10^-5) after the addition of each of the following volumes of 0.100 M KOH: 10.00 mL, Vep and 35.00 mL
*Sunday, April 21, 2013 at 9:25pm by yoo*

**Chemistry**

The problem doesn't specify that the oxygen is completely discharged or not but I'm assuming it is. You may want to check with others to see how they interpret the question. The other point I'm assuming is that the other part of the mixture is inert. .........A + MO ==> A...
*Sunday, October 7, 2012 at 10:45pm by DrBob222*

**A.P. Chemistry**

You have solutions of 0.200 M HNO2 and 0.200 M KNO2 (Ka for HNO2 = 4.00 10-4). A buffer of pH 3.000 is needed. What volumes of HNO2 and KNO2 are required to make 1 liter of buffered solution? How does the henderson hasslebache equation help find the volume?
*Saturday, April 3, 2010 at 5:05pm by Oli*

**chemistry**

A sample of 7.83 grams of NaOH is dissolved into 620 mL of aqueous 0.250 M NaOH (as- sume no volume change). This solution is then poured into 1.67 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution?
*Monday, September 6, 2010 at 1:49pm by Anonymous*

**Chemistry**

Suppose you tired to carry out a double-replacement reaction by mixing together equal volumes of a solution that contained dissolved NaF and a solution that contained dissolved NaCl. Would you expect a reaction, if so write the balanced chemical equation?
*Monday, April 25, 2011 at 1:07am by Anonymous*

**chemistry**

What volume of WATER MUST BE ADDED to 10.0 mL of 6.0 M NaOH to make a solution that is 0.30 M in NaOH? Assume that the volumes are additive. a. 10 mL b. 190 mL c. 200 mL d. 210 mL e. 500 mL
*Monday, March 29, 2010 at 6:30am by lawrence*

**Math**

If F = 5cm^3 G = 40cm^3 then the ratio of volumes is 1:8 = 1:2^3 so the linear ratio is 1:2 so the surface ratio is 1:2^2 = 1:4 If the absorption is proportional to the surface area, then G would absorb 4 times the amount of F. Since G has 8 times the volume, it would have 1/8...
*Tuesday, November 29, 2011 at 10:31am by Steve*

**college chem. please help!!**

Calculate the % empty space in 1 mole of water at 25 degree C (d=0.9971g/ml). The volume of a water molecule can be taken as the sum of the volumes of the 2 hydrogen molecules and the oxygen atom. Use the single bonded covalent radii of 37pm for hydrogen and 66pm for oxygen.
*Tuesday, February 3, 2009 at 9:54pm by christy*

**Chemistry**

When gases are involved you may use a shortcut; i.e., use volumes as if volume = mols. 19.8 L SO3 x (1 mol O2/2 mols SO3) = ? L O2. Then grams = mols x molar mass.
*Monday, February 10, 2014 at 11:01pm by DrBob222*

**Geometry**

two cones are similar= always A pyramid is similar to a square. = never true Two spheres with the same radius are congruent. = always trues Non-similar solids have different volumes. =sometimes true
*Thursday, April 14, 2011 at 8:53pm by Raven*

**chemistry**

What volume of HCl gas is produced by the reaction of 2.4 liters of H2 gas with 1.5 liters of Cl2 gas? (Volumes are at the same T and P.) 1. 3.0 liters 2. 4.8 liters 3. 0.75 liters 4. 2.4 liters 5. 1.5 liters
*Monday, November 1, 2010 at 9:29pm by Bob*

**Chemistry**

3. Calculate the amount of isopentyl acetate that should be present in the reaction mixture at equilibrium based on 300 mmol of acetic acid and 150 mmol of isopentyl alcohol as starting quantities. Use equilibrium constant of 4.2 for this calculation. Moles can be used in ...
*Sunday, September 30, 2012 at 6:01pm by Sdon*

**CHM 152**

An automobile antifreeze contains equal volumes of ethylene glycol (d=1.114 g/mL and FW = 62.07) and water (d=1.00 g/mL) at 25oC. The solution has a density of 1.06 g/mL. What is the molarity of ethylene glycol in the solution?
*Tuesday, June 8, 2010 at 12:06am by Car*

**Physics**

new volume of the gasonline= (9.6E-4*47 + 1)3=3.14liters new volume of aluminum cylinder: if one assumes the change in radius is proportional to change in height, then newV=V*(1+3*24E-6*47)3=3.01 1liters so the difference in the change in volumes is ....
*Wednesday, June 15, 2011 at 9:52am by bobpursley*

**Math (check please)**

Foot (or feet) is for linear measurements, ft² for areas, and ft³ is required for volumes. A cord of wood measures the volume, obtained by multiplying: 8 ft x 8 ft x 2 ft = 8 x 8 x 2 x ft x ft x ft = 128 ft³ So the dimensions (units) are being multiplied as well.
*Tuesday, September 7, 2010 at 8:51pm by MathMate*

**Chemistry 101**

I don't remember my instructor going over this and the book isn't explaining it very well. Can anyone help answer these? Indicate the concentration of each ion or molecule present in the following solutions. 1. 0.30 M NaNO3 2. 1.5x10^-2 M MgSO4 3. 2.00x10-2 M C6H12O6 4. A ...
*Monday, February 22, 2010 at 5:40am by Kelsey*

**chemistry**

A small storage tank for liquefied petroleum gas (LPG) appears to be spherical and have a diameter of about 1 ft.Suppose that some common volumes for LPG tanks are 1 gal, 2 gal,5 gal, and 10 gal. Which is the most probable voume of this particular tank?
*Monday, May 25, 2009 at 2:20pm by Zandria*

**Chemistry**

No I don't think so because after the student goes at it again it is filled to 1.2L and it can't be more than completely filled. I think I am probably supposed to use V1/T1=V2/T2 or P1V1/T1= P2V2/T2. I just do not know because I feel like I have two volumes.
*Tuesday, March 22, 2011 at 5:58pm by Lauren*

**chemisty**

I have data for titration of a strong base against a strong acid when I added volumes of NaOH 1 mL at a time to 50.00 mL of HCl to see the change in pH. One of the questions says to find the molarity of the HCl solution but how do I do this with the data.
*Monday, February 6, 2012 at 3:31pm by marla*

**Analy Chem**

Consider the titration of 100.0 mL of 0.110 M NaOH with 1.00 M HBr. Find the pH at the following volumes of acid added and make a graph of pH versus Va:Va = 0,2,5,8,10,10.1,11,11.1, and 12mL. Compute Ve, first.
*Wednesday, April 11, 2012 at 6:54pm by curtis*

**geometry-finding ratio**

Ratio of the heights of two similar cones is 7/9 what is the ratio of their radii? ratio of their volumes?? TIA If they are similar, the ratio of the radaii is the same. Now consider that the volume of a cone is 1/3 PI r^2 * h So the volume ratio will have a (7/9)^2 * 7/9 ratio
*Tuesday, May 22, 2007 at 4:11pm by jen*

**chem**

Consider the titration of 30.0 mL of 0.050 M NH3 with 0.025 M HCl. Calculate the pH after the following volumes of titrant have been added. (The Kb for NH3 is 1.8e-05.) (a) 0 mL . (b) 25.0 mL . (c) 59.0 mL . (d) 60.0 mL (e) 63.0 mL (f) 67.5 mL
*Monday, March 25, 2013 at 12:03pm by hannah*

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