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October 21, 2014

Search: CHEMISTRY HELP NEEDED A.S.A.P

Number of results: 50,797

chemistry 2
You are instructed to create 800. mL of a 0.69 M phosphate buffer with a pH of 7.6. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. what is the molarity needed for the acid component of the buffer?What is the molarity needed for the base ...
March 4, 2014 by Danielle

chemistry
what is the number of grams needed to prepare a 1.23 M solution of nitric acid if 250.0 mL are needed?
May 19, 2011 by Anonymous

Chemistry help needed
How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?
September 15, 2013 by Kris

chemistry
a student needed 1000 ml of a 0.10 buffer of ph 4.0. calculate the amount of sodium acetate and acidic acid needed for this solution
April 20, 2010 by bay

Chemistry please help!
Please help. I have no idea how to do these 4 homework problems. 1- How many milliliters of 0.140 M HCl are needed to completely neutralize 42.0mL of 0.106 M Ba(OH)2 solution? 2-How many milliliters of 0.123 M H2SO4 are needed to neutralize 0.250 g of NaOH ? 3-If 55.2 mL of ...
February 22, 2010 by Robert

Chemistry..
A chemical engineer calculated that 15.0 mol H2 was needed to react with excess N2 to prepare 10.0 mol NH3. But the actual yield is 60.0% . Write a balanced chemical equation for the reaction. Is the amount of H2 needed to make 10.0 mol NH3 more than, the same as, or less than...
January 2, 2013 by Anonymous

chemistry
suppose i want to find out how many mL of 1.0M AgNO3 are needed to provide 169.9g of pure AgNO3. what is step one in solving this problem? How many mL of solution are needed?
November 18, 2009 by lynda smith

Chemistry
Record the amount of heat needed to change phases for water-ice to steam using graphical analysis. Is there a one accurate amount of heat needed to change phases, I thought it varied depending the problem... Would the question be asking for the heat needed in my graph that I ...
June 10, 2010 by Amy~

Chemistry
If 62.7 ml of .208M HCL is needed to needed to neutralize a solution of Ca(OH)2, how many grams of Ca(OH)2 must be in the solution?
February 26, 2012 by Arianna

math
Draw a venn diagram to illustrate the following. In a shop 50 cars were inspected and it found that 23 needed new brakes and 34 needed new tires. 3 needed no services at all how many needed new brakes and new tires? How many only needed brakes? Please help
December 9, 2011 by kia

Chemistry
Calculate the mass of copper needed to displace 5.0g of silver from silver nitrate solution. Cu+2AgNO3->Cu(NO3)2+2Ag (Relative atomic masses:Ag=108,Cu=63.5) I got it to be 3.175g needed.
January 18, 2008 by Anonymous

Chemistry Solubility help!!!!!!!!!
INFORMATION: [HCl] = 0.1388 M We placed 0.5 g Ca(OH)2 in 100 mL of the following solutions: Flask A: Distilled Water (7.4 mL of HCl needed to titrate) Flask B: 0.05 NaOH (12.1 mL of HCl needed to titrate) Flask C: 0.025 NaOH (10.8 mL of HCl needed to titrate) Flask D: 0.0125 ...
March 26, 2013 by Sally

Chemistry
Why is the temperature needed to freeze ocean water lower than the temperature needed to freeze the surface of a freshwater lake?
October 18, 2012 by Anonymous

Chemistry - Solubility
INFORMATION: [HCl] = 0.1388 M We placed 0.5 g Ca(OH)2 in 100 mL of the following solutions: Flask A: Distilled Water (7.4 mL of HCl needed to titrate) Flask B: 0.05 M NaOH (7.5 mL of HCl needed to titrate) Flask C: 0.025 M NaOH (10.8 mL of HCl needed to titrate) Flask D: 0....
March 31, 2014 by PleaseHelpThankYou!

Chemistry
Calculate the volume of 2.45 M NaI that would be needed to precipitate all of the Hg+2 ion from 185 mL of a 2.44 M Hg(NO3)2. AND Calculate the molarity of an acetic acid solution if 47.81 mL of the solution is needed to neutralize 147 mL of 1.32 M sodium hydroxide.
May 6, 2013 by Marsha

Chemistry - Solubility
INFORMATION: [HCl] = 0.1388 M We placed 0.5 g Ca(OH)2 in 100 mL of the following solutions: A 25 ml aliquot was used Flask A: Distilled Water (7.4 mL of HCl needed to titrate) Flask B: 0.05 M NaOH (7.5 mL of HCl needed to titrate) Flask C: 0.025 M NaOH (10.8 mL of HCl needed ...
March 31, 2014 by PleaseHelpThankYou!

Chemistry Help Please!!
We did an experiment and I don't really know how to calculate this question. If you could show me how to do one, then I could do the rest. INFORMATION: HCl = 0.1404 M We placed 0.5 g Ca(OH)2 in 100 mL of the following solutions: Flask A: Distilled Water (8.5 mL of HCl needed ...
March 26, 2012 by Ally

Chemistry HELPP!!!!!!
We did an experiment and I don't really know how to calculate this question. If you could show me how to do one, then I could do the rest. INFORMATION: HCl = 0.1404 M We placed 0.5 g Ca(OH)2 in 100 mL of the following solutions: Flask A: Distilled Water (8.5 mL of HCl needed ...
March 26, 2012 by Myles

chemistry
how do i do this \? a 4.0mg/dl standard solution is needed. To prepare 100ml of the working standard. How much stock standard of a 1mg/ml (100mg/dl) solution is needed. i dont understand this conceptually / thanks
January 21, 2010 by Dan_9

Chemistry
Suppose you wanted to find out how many milliliters of 1.0 M AgNO3 are needed to provide 169.88 g of pure AgNO3. a. What is step 1 in solving the problem? b. What is the molar mass of AgNO3? c. How many milliliters of solution are needed?
April 22, 2013 by Somer

Chemistry
How would you prepare 165 mL of a 0.976 M NaOH solution, starting with a 6.36 M stock solution? Volume of solution needed? Volume of water needed?
October 21, 2014 by Anna

Algebra- word problem
Jordan has a photograph on his wall that is 3 in. long and 6 in. wide. He takes it to be framed which increases the length and width by 2 in. each. How does getting the picture framed change the amount of wall space needed? My choice is B- Correct?? Choices A. the wall needed ...
May 15, 2011 by Mary

Science - Chemistry
Aluminum oxide is formed from the reaction of metallic aluminum with oxygen gas. How many moles of Aluminum are needed to form 3.4 moles of Aluminum oxide? Writr the equation and balance it. 4Al + 3O2 ==> 2Al2O3 The equation tells you that 4 mols Al are needed to form 2 ...
January 23, 2007 by Sara

Grade 11 Chemistry!
10% (m/m) sodium hydroxide solution, NaOH, is used to break down wood fibre to make paper. a) What mass of solute is needed to make 250mL of 10% (m/m) solution? b) What mass of solvent is needed? c) What is the molare concentration?
December 10, 2008 by Kairi

Chemistry
What is needed for nuclear fusion to occur? pressure, a beta particle or high temperature? I think it's only high temperature and pressure needed.
July 19, 2010 by Derrick

Health
1. What is needed to make blood cells? 2. What pair of workers is needed to produce estrogen? 3. What is needed to produce eleven hormones that control the actions of other endocrine glands? 4. What is needed to pass oxygen from lungs into blood vessels and welcome carbon ...
December 4, 2011 by Hayley

Chemistry
1 N204(l) + 2 N2H4(l) --> 3 N2(g) + 4 H2O(g) If you start with: 5.0 x 10^4 g hydrazine (N2H4) "in the tank": 1) How many moles of nitrogen can be created (assuming 100% yield)? 2) How many moles of water can be produced? 2) What mass of dinitrogen tetroxide (N2O4) is needed...
November 23, 2010 by Lauren K.

Chemistry
1 N204(l) + 2 N2H4(l) --> 3 N2(g) + 4 H2O(g) If you start with: 5.0 x 10^4 hydrazine (N2H4) "in the tank": 1) How many moles of nitrogen can be created (assuming 100% yield)? 2) How many moles of water can be produced? 2) What mass of dinitrogen tetroxide (N2O4) is needed? ...
November 23, 2010 by Lauren K.

Chemistry
10% (m/m) Sodium Hydroxide solution, NaOH(aq) is used to break down wood fibre to make paper. A) What mass of the solute is needed to make 250mL of 10% (m/m) solution? B) What mass of solvent is needed? C) What is the molar concentration of the solution?
May 2, 2011 by Saman

Chemistry
My questions keep getting cut off. What am I doing wrong? Here is my question again. Thanks for the help. What is the empirical formula for a compound whose molecular formula is C2Cl6? a) CCl3 b) CCl4 c) C2Cl6 d)CCl e) more info needed I think the answer is E more information ...
October 25, 2009 by Mattt K

Chemistry
Balanced Chemical Equation: 1 N204(l) + 2 N2H4(l) --> 3 N2(g) + 4 H20(g) If you start with: 5.0 x 10^4g hydrazine (N2H4) "in the tank": 1) How many moles of nitrogen can be created (assuming 100% yielded)? 2) How many moles of water can be produced? 3) What mass of ...
November 19, 2010 by Roger

Chemistry
Balanced Chemical Equation: 1 N204(l) + 2 N2H4(l) --> 3 N2(g) + 4 H20(g) If you start with: 5.0 x 10^4g hydrazine (N2H4) "in the tank": 1) How many moles of nitrogen can be created (assuming 100% yielded)? 2) How many moles of water can be produced? 3) What mass of ...
November 19, 2010 by Roger

chemistry
1998 scientists using a special type of electron microscope were able to measure the force needed to break a single chemical bond. If 2.0 x 10^-9 N was needed to break a C-Si bond, estimate the bond enthalpy in kJ/mol. Assume that the bond had to be stretched by a distance of ...
September 26, 2011 by Amber

Chemistry
What partial pressure of oxygen above the water (in atmospheres at 0 C ) is needed to obtain this concentration? The solubility of O2 in water at 0 C and 1 atm partial pressure is . 2.21 x 10^-3 mol/L Concentration needed is 4mg/L Stuck and need help, anything is appreciated!
September 21, 2014 by Joe

Chemistry
How many grams of a stock solution that is 87.0 percent H2SO4 by mass would be needed to make 200 grams of a 35.5 percent by mass solution? Show all of the work needed to solve this problem.
September 2, 2013 by Stephanie

Chemistry
WOULD THE VOLUME OF A 0.10M NAOH SOLUTION NEEDED TO TITRATE25.0ML OF A 0.10M HNO2 ( A WEAK ACID)SOLUTION BE DIFFERENT FROMTHAT NEEDED TO TITRATE 25.0ML OF A 0.10M HCL (A STRONGACID)SOLUTION?
June 12, 2013 by Naomie

Algebra ll
Cleopatra was needed barge workers, and when the word went out 175 workers showed up, that is 21/2 times the amount needed. How many workers were originally needed? (I am trying to help my niece with her homework, and we live 600 miles apart. Can you explain to me how to get ...
August 29, 2007 by Trisha

chemistry
Another “grand challenge” for engineering is managing the nitrogen cycle. Use the nature of the chemical bond in diatomic nitrogen to explain why any management is needed for this biogeochemical cycle. With so much nitrogen available in the atmosphere, why are engineering ...
February 3, 2011 by Jazmin

AP CHEMISTRY
1) Calculate the molarity of a solution of sodium hydroxide, NaOH,if 23.64 mL of this solution is needed to neutralize 0.5632g of potassium hydrogen phthalate. 2) It is found that 24.68 mL of 0.1165M NaOH is needed to titrate 0.2931 g of an unknown acid to the phenolphthalein ...
March 8, 2012 by HELP PLEASE

Chemistry
Balance the following equation for a half reaction that occurs in acidic solution. Use e– as the symbol for an electron. U^4+ --> UO2^+ There is a hint: In acidic solution, you may add H2O and H as needed to balance oxygen and hydrogen. When finished, don\'t forget to ...
April 28, 2014 by Clueless

CHEMISTRY
4. The human eye is a complex sensing device for visible light. The optic nerve needs a minimum of 2.0 x 10-17 J of energy to trigger a series of impulses that eventually reach the brain. (a) How many photons of red light (700.0 nm) are needed? (b) How many photons of blue ...
February 9, 2014 by Sutheshan

chemistry
A student needed to make 200 ml of 0.1 M naOH. If the stock soluton was 0.75 M, how much of the stock solution and how much wter would be needed to make this solution?
May 4, 2011 by Amy

CHEMISTRY
How much heat is needed to melt 150g of ice? and How much heat is needed to change 150g of ice into steam at 110 degrees? My heat of fusion is 361 and my percent error is 8 if you need that. Answers quickly please :(
March 8, 2011 by TaShe

chemistry
How do I find out how many ml of NaOH i need to titrate H3PO4. I used the ice table to knock off the two protons but im using a .2200M NaOH and do not Know how to determine the volume needed before hand. In other words i need some pre-calculations for volume of titrate needed ...
July 9, 2011 by ted

chemistry
The Fe(ox)33– complex ion creates an emerald green solution when dissolved. The observed solution color of the complex indicates the size of o is: A. large. B. small. C. in between. D. inconclusive, more information is needed. The observed solution color of the complex ...
June 30, 2010 by Jin

chemistry
he Fe(ox)33– complex ion creates an emerald green solution when dissolved. The observed solution color of the complex indicates the size of o is: A. large. B. small. C. in between. D. inconclusive, more information is needed. The observed solution color of the complex ...
June 30, 2010 by ....

chemistry
If 13.5 ml of concentrated (17.0 M) of sulfuric acid was spilled on the chemistry counter, calculate the mass of sodium bicarbonate needed to neutralize the acid
April 28, 2013 by Kaitlyn

Chemistry
Can someone please check my work? Calculate the mass of (NH4)2S2O8 needed to prepare 250mL of a 0.100M solution. I got 5.705 g. Calculate the volume of 2.00M KI needed to prepare 250mL of a 0.200M solution. I got 0.025L or 25mL. Calculate the volume of 0.100M Na2S2O3 needed to...
January 22, 2011 by Rachel

chemistry
how many gram of h2 needed to react with 3.10 n2
April 18, 2013 by sara

chemistry
how many gram of h2 needed to react with 3.10 n2
April 18, 2013 by sara

Organic Chemistry
I am suppose to calculate the theoretical amount (volume) of 3M sodium hydroxide needed to convert 1.5 g of benzoic acid to its salt. Also calculate the volume of 12M HCl needed to convert the sodium benzoate back to benzoic acid. how do I go about doing this? Thanks
May 18, 2010 by Jake

chemistry
1. calculate the volume of concentrated HNO_3 (68%)that is needed to prepare stock solution 0.25M in 1000mL volumetric flask. (density HNO_3 = 1.513 g/cm^3) 2. from above stock solution, determine volume needed to dilute to 500mL volumetric flask that contained 10 times dilution.
July 10, 2013 by khadijah

Chemistry
1. calculate the volume of concentrated HNO3 (68%)that is needed to prepare stock solution 0.25M in 1000mL volumetric flask. (density HNO3 = 1.513 g/cm^3) 2. from above stock solution, determine volume needed to dilute to 500mL volumetric flask that contained 10 times dilution.
July 10, 2013 by Susan

Chemistry
How are the two parts of a conversion factor related? Either the numerator or the denominator is one of the units needed for the converstion, then the denominator/numerator is the other unit needed. thanks. whats two conversion factors based on the relationship between hours ...
January 25, 2007 by Dennis

chemistry
How many mL of 0.3 M HCl(aq) are needed to neutralize a 60 mL solution of 0.15 M Ba(OH)2?
May 5, 2008 by mo

chemistry
what volume of O2 at STP is needed to react with 4.52 g of K
May 25, 2010 by chris

chemistry
How many grams of N2 are needed to react with 125g of H2?
December 5, 2011 by sara

chemistry
How many moles of are needed to react with 0.460 ?
November 6, 2012 by monica

physics multiple choice
A force F is required to push a crate along a rough horizontal floor at a constant speed V with friction present. What force is needed to push this crate along the same floor at a constant speed 3V if friction is the same as before? A. A constant force 3F is needed. B. A force...
February 2, 2011 by mely

physics multiple choice
A force F is required to push a crate along a rough horizontal floor at a constant speed V with friction present. What force is needed to push this crate along the same floor at a constant speed 3V if friction is the same as before? A. A constant force 3F is needed. B. A force...
February 2, 2011 by andrea

AP Chemistry
To eject electrons from the surface of potassium metal, 222kJ/mol of electrons are needed. a) What minimum frequency of light is needed to supply the required energy? b) What is the wavelength of this light? c) If potassium is irradiated with light having wavelength of 350 nm...
November 17, 2010 by qwerty123

chemistry
Phosphorus pentachloride, PCl5, reacts with water to form phosphoric acid, H3PO4, and hydrochloric acid, HCl. PCl5(s) + 4H2O() → H3PO4(aq) + 5HCl(aq) (a) What mass of PCl5 is needed to react with an excess quantity of H2O to produce 23.5 g of H3PO4? (b) How many ...
November 11, 2013 by Nadz

Finance
If a corporation wanted to guarantee its long term costs of financing an investment project, it could: a.) sell t-bill futures for when the funds were needed b.) buy t-bill futures for when the funds were needed c.) sell t-bond futures for when the funds were needed d.) buy t-...
April 28, 2010 by Sam

Chemistry
the number of moles of O2 needed to produce 14.2g of P4O10 from P?
September 9, 2007 by Anonymous

chemistry
how many grams of H are needed to produce 1.80grams of H2O
March 5, 2010 by Anonymous

chemistry
what is the energy needed to melt 5.62 moes of ice in 0'C
March 23, 2010 by Anonymous

chemistry
if i want to change the pH of any solution from 5 to 8 what the volume of NaOH 0.1 N needed
March 9, 2011 by mohamed

chemistry
how many mL of 0.50 M ammonia would be needed to react with 1.0 L of 0.75 M HClO4
April 18, 2011 by me

Chemistry
how many moles of o2 are needed to produce 3.91 mol fe2o3
November 22, 2011 by Anonymous

chemistry
What mass of ZnCl2 is needed to make 4 L of 1.8 M solution?
December 8, 2011 by ABIGAIL

Chemistry
How many mL of 5.5 M KOH are needed to prepare 300 mL of 1.2 M NaOH?
March 11, 2012 by Amanda

Chemistry
How many mL of .48 M NaOH are needed to react with 2.00 moles of H3PO4?
April 8, 2012 by Sam

chemistry
what is the mass of LiF is needed to produce 2.5 L of a .30 M solution
April 10, 2013 by Anonymous

Chemistry
How many grams of NaOh are needed to prepare 0.5l of a 4m solution?
June 10, 2013 by Keymaurie

Chemistry
How many mole of KClO3 are needed to make 320g O2
September 10, 2013 by Anonymous

chemistry
How many grams of O2(g) are needed to completely burn 24.0 g of C3H8(g)?
September 19, 2013 by college chem

chemistry
How many grams of H2 are needed to produce 10.75g of NH3?
October 14, 2013 by kristy

Chemistry
How many grams of H2 are needed to produce 12.88g of NH3?
February 19, 2014 by Gullible

chemistry
How much energy is needed to melt 25.4 grams od I2?
April 21, 2014 by jordan

chemistry
Prepare 500mL of a 0.200 M acetate buffer at pH 4.90 using only pure acetic acid, 3M NaOH, and water. 1) Add acetic acid to ~400mL of water in a 500 mL beaker. How many grams of acetic acid are needed? 2)Add 3 M NaOH solution until pH is 4.90. What volume of NaOH is needed? (...
September 5, 2011 by Ryn

math
A small business just leased a new computer and color laser printer for three years. The service contract for the the computer offers unlimited repairs for a fee of $100 a year plus a $25 service charge for each repair needed. The company's research suggested that during a ...
January 1, 2008 by clarence

chemistry
A chemistry experiment needed 12.45 grams of chemical to produce one liter of a gas. If Zoe wanted 24 liters of gas, how many kilograms of the chemical will she need?
May 3, 2013 by damien

chemistry
How many mL of 0.3 M HCl(aq) are needed to neutralize a 60 mL solution of 0.15 M Ba(OH)2? THe answer please
May 5, 2008 by mo

chemistry
what mass of water is needed to react with 10.0 grams of PI3?
October 19, 2009 by william

chemistry
what mass of water is needed to completely react with 2.35g of Ca
November 1, 2009 by nathalia

chemistry
what mass of iron is needed to react completely with 16 g of sulfur?
November 10, 2009 by mkh

Chemistry
How much energy is needed to melt a 30.5 g ice cube?
February 23, 2010 by Christopher

Chemistry
How many mL of 0.75M HCl are needed to neutralize 20.0 grams of NaOH?
April 29, 2010 by Rachel

Chemistry
How many mL of 0.75M HCl are needed to neutralize 20.0 grams of NaOH?
April 29, 2010 by Rachel

chemistry
How much heat is needed to raise 300g of Ethanol from 0 C to 20 C?
June 3, 2010 by Person

chemistry
How many ML of H2SO4 (20m) are needed to make 500ml of 5M solution?
September 21, 2010 by ad

chemistry
urgent help needed!!! what is .0966 rounded to 2 significant digits? and why?
September 22, 2010 by Ana

chemistry
how many pounds of uranium are needed to make a nuclear bomb
September 29, 2010 by lee

chemistry
How many mole of carbon are needed to react with 60 mol of sulferdioxide?
October 1, 2010 by Angie

Chemistry
How many moles of n2 are needed to react with 0.500 mol of lithium
October 7, 2010 by Sharon

chemistry
what is the mass of Na2CO3 needed to contain 15 grams of sodium?
January 4, 2011 by Sully

chemistry
if 150g of Ca(OH)2 is reacted with excess H2, how much energy will be needed?
January 9, 2011 by Vilika

chemistry
what is the mass of CuS04 needed to prepare a 125ml solution of 3.5M?
March 7, 2011 by kjkajkjujo

Chemistry
how much sulfur dioxide is needed to decrease the pH of 1L of water from 9.8 to 8.0?
March 8, 2011 by lisa

Chemistry/Elements
What is needed to have Nitrogen and Lithium react?
March 17, 2011 by Vince

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