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April 23, 2014

Search: potassium permanganate..

Number of results: 1,521

chemistry help!
Potassium has an atomic mass of 39.10amu. a sample of potassium is made up of isotopes potassium-39 (mass=38.964) and potassium-41(mass =40.962 amu). What percentage of the potassium sample is potassium-39? what percent of the sample is potassium-41?
Thursday, October 20, 2011 at 12:26am by Skylar

Chemistry
Need Help On This Question.! Potassium chloride reacts with bromine forming potassium bromide plus chlorine. If 500g of potassium bromide are produced, how many grams of potassium chloride reacted?
Saturday, December 4, 2010 at 9:05pm by Jacky

chemistry
Which one of the following will have the greatest number of moles of potassium ion: 10.0 mL of .10 M potassium hydroxide, 30.0 mL of 0.15 M potassium carbonate, or 25.0 mL of 0.080 M potassium phosphate
Sunday, July 31, 2011 at 11:29pm by lori

Chemistry
What colors would you expect to see in a flame for the following compounds: potassium chloride, potassium nitrate, and potassium sulfate. Explain your answer
Thursday, April 8, 2010 at 7:02pm by Sarah

CHEMISTRY
Write the net ionic equation for the reaction between...(and MUST INCLUDE STATES, please post answers to all so i can verify if im correct and explanation to one of them) a) potassium hydroxide and copper(I) nitrate b) potassium sulfite and lead(II) nitrate. c) lead(II) ...
Sunday, April 6, 2014 at 11:36am by NEED HELP PLEASE!!!

science
To get you started: It looks like you want the equation for potassium and sulfur reacting to form potassium sulfide, that is potassium + sulfur ---> potassium sulfide Write this down using the chemical symbols for each. You will need to find the number of valence electrons ...
Tuesday, August 31, 2010 at 9:55pm by karla

Chemistry
Which of the following aqueous solutions are good buffer systems ? . 0.26 M hydrochloric acid + 0.24 M potassium chloride . 0.14 M acetic acid + 0.20 M potassium acetate . 0.16 M potassium hypochlorite + 0.23 M hypochlorous acid . 0.31 M hydrocyanic acid + 0.28 M potassium ...
Saturday, February 26, 2011 at 3:06pm by Chris

chemistry
Potassium nitrate is made by adding potassium chloride to hydrogen nitrate in the presence of oxygen gas. Along with the potassium nitrate, chlorine and water are produced. How would write the equation?
Sunday, February 26, 2012 at 1:49pm by mark

chemistry
Calculate the mass of salts needed for constructing a buffer using potassium monobasic phosphate and potassium dibasic phosphate with the total concentration of 100 mM. The solution is to be prepared in DI water and the pKa value for potassium monobasic phosphate is 7.21 and ...
Sunday, November 14, 2010 at 12:36am by dave

chemistry
15.45 grams of solid potassium chlorate decomposes when heated to form potassium chloride and oxygen gas. assuming 100% yeild how many grams of solid potassium will be produced?
Monday, April 11, 2011 at 6:51pm by mary

physiology
The single most important factor influencing potassium ion secretion is a) the potassium ion content in the renal tubule cells b) intracellular sodium levels c) potassium ion concentration in blood plasma d) pH of the ICF c
Monday, December 11, 2006 at 4:19am by pbear

chemistry
The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25 C. What is the mole fraction of potassium permanganate (KMn04) in this saturated solution? What is the molality of the potassium permanganate solution?
Friday, March 14, 2008 at 9:31pm by thanh

CHEM
Which reactants could be used safely to prepare potassium chloride? 1. aqueous potassium hydroxide and dilute hydrochloric acid 2. aqueous potassium sulphate and aqueous sodium chloride 3. potassium and aqueous sodium chloride The answer is 1, but i don't really know how to ...
Tuesday, October 20, 2009 at 11:05am by Marrion

chemistry
When potassium chlorate is heated, it decomposes into potassium chloride and oxygen in the reaction 2KCIO3 -> 2KCI + 3O2. How much oxygen is liberated when 50 g of potassium chlorate is heated?
Saturday, November 26, 2011 at 7:35pm by Tammy

Chemistry
20.When black gunpowder explodes, potassium nitrate, carbon, and sulfur react with each other to form nitrogen, carbon dioxide, and potassium sulfide. If thee original mixture contains 50.0 g of potassium nitrate, what is the total volume of the gases produced in the reaction...
Thursday, May 15, 2008 at 5:17pm by Ali

chemistry
write a net ionic equation for the following: 1)Iron (III) chloride reacts with Potassium hydroxide to produce Iron (III) oxide, Potassium chloride, and Hydrogen gas. 2)Hydrochloric acid reacts with Potassium carbonate to produce Potassium chloride, Hydrogen gas and Carbon ...
Tuesday, October 26, 2010 at 7:16pm by rachel

physiology
the blood-brain barrier prevents hydrophobic molecules from diffusing into the brain. T or F Excitable cells are incapable of maintaining a constant resting membrane potential. T or F The membrane of resting nerve cells is more permeable to______ions than _________ions. a....
Sunday, October 12, 2008 at 3:42am by anna

math
You're asked to add 15 mEq of potassium chloride per 100 mL of Normosol. Potassium chloride is available as 20 mEq/ 10mls. The amount of Potassium chloride needed for a 3 L bag of Normosol would be ?
Monday, July 21, 2008 at 8:45pm by LYNN

chem
The mole fraction of an aqueous solution of potassium perchlorate is 0.125. Assuming that the density of this solution is 1.20g mL-1, calculate the following: (A) the mass percent of potassium perchlorate in the solution. (B) the molarity of potassium perchlorate in the ...
Tuesday, December 14, 2010 at 5:38pm by Lori

Chemistry
I am not sure if I calculated the exact molarity of the potassium permanganate. I multiplied the molarity of the potassium permanganate by the liters of potassium permanganate used in the titration and divided it by the total liters of solution. I don't know if that if how it ...
Wednesday, November 28, 2012 at 4:27pm by Zach

Chemistry
I am not sure if I calculated the exact molarity of the potassium permanganate. I multiplied the molarity of the potassium permanganate by the liters of potassium permanganate used in the titration and divided it by the total liters of solution. I don't know if that if how it ...
Wednesday, November 28, 2012 at 4:34pm by Zach

chemistry
A potassium iodide solution is made by mixing 0.520 g of potassium iodide with 120.0 mL of water. Calculate the molality of potassium iodide. Assume that the density of water is 1.000 g/mL
Thursday, April 19, 2012 at 2:38am by hereyago

general chemistry
I need the oxidation half reactions, reduction half reactions, and net ionic equations for the following reactions: 1)magnesium +0.1M zinc sulfate 2)copper+0.1M zinc sulfate 3)zinc+0.1M copper(II)sulfate 4)zinc+3M HCl 5)copper+3M HCl 6)0.1M potassium iodide+ 0.1M copper(II)...
Saturday, November 13, 2010 at 1:42pm by masooma

Chemistry
The main radioisotope in a banana is potassium-40, a beta emitter with an activity of 242 Bq/g. An average medium banana has about 320 mg of potassium and the natural abundance of potassium-40 is .0117%. Calculate the value of the BED in a.) Gy b.) Sv Assume 5.02 nGy/Bq
Thursday, March 27, 2014 at 6:39pm by Anonymous

chemistry
potassium chlorate will decompose to produce potassium chloride and oxygen gas . if you begin with 45 kg of potassium chlorate, how many liters of oxygen gas measured at stp might you expect to produce from this reaction
Friday, September 7, 2012 at 1:33pm by sam

chemisty
The question is a little confusing. I don't know what potassium dicarbonate is. Potassium carbonate is K2CO3.
Wednesday, July 22, 2009 at 12:18am by DrBob222

CP Biology
At what temperate are potassium nitrate and potassium chloride equally soluble?
Thursday, September 16, 2010 at 9:50pm by Thomas

chemistry
what is the balanced equation for the reaction of potassium dichromate and potassium hydrogen phthalate?
Thursday, January 10, 2013 at 5:07pm by rob

Chem
How many potassium ions are present in 91.1g of potassium nitrate?
Thursday, December 3, 2009 at 5:32pm by Lindsey

Chemistry 1
What mass of potassium oxide is produced by the oxidation of 5 grams of potassium?
Sunday, December 12, 2010 at 7:54pm by Cassandra

chemistry
How many grams of potassium sulfide are produced from the reaction of 1.23 moles of potassium with sulfur?
Sunday, February 24, 2008 at 7:56pm by Barb

chemistry
Write Sulfuric acid and potassium hydroxide where the products are potassium sulfate and water.
Monday, February 16, 2009 at 11:08pm by Liz

chemistry
What is the formula for the compound formed when potassium reacts with nitrogen? I think you mean potassium nitride (K3N)
Monday, December 6, 2010 at 8:24am by Dr Russ

Chemistry
How many potassium atoms in 7.50g of potassium chromate?
Sunday, September 29, 2013 at 1:21pm by Madison

Health
If your kidneys are functioning properly, your body rids itself of excess Potassium. If they are not working right, you can have potassium toxicity
Saturday, October 11, 2008 at 8:50am by bobpursley

Gen Chem
What are the net ionic equations for: 1. Potassium Fluoride and Ammonium Chloride and 2. Sodium Hydrogen Sulfite and Potassium Cyanide?
Monday, March 28, 2011 at 1:19am by Ann

chemistry
What mass of potassium chloride, a salt substitute often used by heart patients, can be produced directly from 5.2 g potassium and 7.9 g chlorine? 9.9 g
Tuesday, February 14, 2012 at 11:00pm by krystal

Biology
A plant does not use potassium for a building material or energy source, but it stops doing photosynthesis and dies if it runs out of potassium. Why?
Tuesday, September 11, 2012 at 6:08am by Anginina

Biology
A plant does not use potassium for a building material or energy source, but it stops doing photosynthesis and dies if it runs out of potassium. Why?
Tuesday, September 11, 2012 at 6:10am by Anginina

CHEM
I posted a question earlier, and i'm still abit confused. What is the reaction between potassium and aqueous sodium chloride? I was told that the products are KOH, H2, and KCl. But shouldn't the reaction be a displacement reaction? Since Potassium is more reactive than sodium...
Wednesday, October 21, 2009 at 2:57am by Marrion

Chemistry
Lead(II) nitrate reacts with potassium iodine to produce lead(II) iodide and Potassium nitrate. If 1.23 mg of lead nitrate are consumed, what is the mass of the potassium nitrate produced?
Monday, March 8, 2010 at 7:17pm by stocihs hard

chemistry
How many grams of potassium nitrate are required to produce 5.00 g of potassium nitrite according to the equation below? 2KNO3(s) ---> 2KNO2(s) + O2(g)
Saturday, June 19, 2010 at 6:54pm by andrea.

Chemistry
The decomposition of potassium chlorite yields oxygen gas and potassium chloride. If the yield is 95%, how many grams of KClO3 are needed to produce10.0 L of O2?
Sunday, December 11, 2011 at 8:46pm by PleaseHelp

Chemistry
How many grams of potassium phosphate must be dissolved in 3.75 Liters of water to produce a soltuion that contains 8*10^23 potassium ions?
Tuesday, February 14, 2012 at 1:34pm by Whitney

Chemistry
How many grams of potassium phosphate must be dissolved in 3.75 Liters of water to produce a soltuion that contains 8*10^23 potassium ions?
Tuesday, February 14, 2012 at 1:40pm by Mary

physical science
http://www.lenntech.com/periodic/water/potassium/potassium-and-water.htm 2 , 2 --> 2 , 1
Wednesday, January 5, 2011 at 5:17pm by Damon

chem
how many grams of potassium chlorate decomposes to potassium chloride and 638 mL pf o2 at 128C and 752 torr? 2KClO3(s) 2KCl(s) + 3O2(g)
Tuesday, July 5, 2011 at 12:46am by Katie

chemistry
The reaction between potassium metal and chlorine gas is described by the following thermochemical equation K(s) + C_l2(g) = KCl(s) H =437 kJ mol1 What will be the enthalpy change (to 2 significant figures) for the reaction when 6.0 g of potassium metal reacts with ...
Tuesday, December 30, 2008 at 12:55pm by trigger

chemistry
Is it true that more potassium bromide can dissolve in distilled water than in a solution of potassium chloride? Im thinking maybe the common ion effect is present here?
Thursday, April 3, 2008 at 10:48pm by MikeSo

Chemistry
PLease help how many grams of potassium chlorate decomposes to potassium chloride and 638 mL of O2 at 128C and 752 torr? the formula given: 2KClO3(s) 2KCl(s) + 3O2(g)
Tuesday, July 5, 2011 at 12:57am by Katie

Statistics
I need help on this one too. Any one willing to get me started? THANKS! Potassium is a mineral that helps the kidneys function normally. It also plays a key role in cardiac, skeletal, and smooth muscle contraction, making it an important nutrient for normal heart, digestive, ...
Wednesday, August 1, 2007 at 4:50pm by Kasey

law of definite composition
when performing an experiment using potassium chlorate and heating it to form potassium chloride what reasons can you offer for any differences between your results and another lab group in your class?
Wednesday, March 10, 2010 at 1:17pm by Ash

chemistry
what mass (in grams) of solid potassium permanaganate is required to prepare 250mL of a 0.02 M of potassium permanaganate solution?
Wednesday, September 23, 2009 at 5:24pm by Hannah

chemistry
what mass (in grams) of solid potassium permanaganate is required to prepare 250mL of a 0.02 M of potassium permanaganate solution?
Wednesday, September 23, 2009 at 5:25pm by Hannah

science
write the correct formula, balance the equation, and name the type of equation. potassium + sulfur + potassium sulfide
Tuesday, August 31, 2010 at 9:55pm by ty

Chemistry
Describe how you could make 5 mL of 2M potassium hydroxide solution if you have potassium hydroxide pellets available.
Tuesday, November 8, 2011 at 10:34am by Wanda

Chemisty
The compound potassium carbonate is a strong electrolyte. Write the reaction when potassium carbonate is put into water
Sunday, January 22, 2012 at 11:11pm by ben

Chemistry
How many grams of a 17.7% potassium sulfate solution would contain 419.9 g potassium sulfate? Answer in units of g
Thursday, March 13, 2014 at 10:50pm by Kristen

Chemistry
How many mL of a stock solution of 2M potassium nitrate would you need to prepare 100mL of .150 M potassium nitrate?
Wednesday, May 16, 2012 at 8:08pm by Lis

Chemistry
0.125g of sodium dichromate is to be reacted wtih 0.025M potassium iodide. How many mLs of the potassium iodide solution will be needed.
Sunday, June 16, 2013 at 9:40pm by Jessica

Chemistry
KClO3 = KClO4 + KCl What is the conversion factor to convert between moles of potassium chlorite and moles of potassium perchlorate?
Wednesday, March 19, 2014 at 11:17am by Valarie

chemistry
if 25 moles of sodium phosphate are reacted with potassium hydroxide, how many grams of potassium phosphate will form?
Friday, May 6, 2011 at 11:54am by carlene

Statistics
I need help on this one too. Any one willing to get me started? THANKS! Potassium is a mineral that helps the kidneys function normally. It also plays a key role in cardiac, skeletal, and smooth muscle contraction, making it an important nutrient for normal heart, digestive, ...
Wednesday, August 1, 2007 at 4:51pm by Kasey

Chemistry
The potassium bond to the rest of the molecule is ionic but all of the other bonds are covalent. So we would call potassium citrate an ionic compound; it dissociates in aqueous solution into potassium + ions and citrate negative ions. All of the bonds within the citrate ion ...
Saturday, November 28, 2009 at 10:01pm by DrBob222

chemistry
CALCULATE THE NUMBERS OF MOLES OF POTASSIUM CHLORATE THAT MUST DECOMPOSE TO PRODUCE POTASSIUM CHLORIDE AND 1.80 MOLES OF GLYCOGEN GAS
Wednesday, March 16, 2011 at 10:53pm by ALEX

Chemistry
How many grams of potassium chlorate, KClO3(s) must decompose to produce potassium chloride, KCl(s), and 1.45 grams of oxygen gas?
Sunday, March 20, 2011 at 2:59pm by franci

Chemistry
1. Potassium, a silvery metal, reacts with bromine, a corrosive, reddish liquid, to yield potassium bromide, a white solid. Write the balanced equation, and identify the oxidizing and reducing agents.
Tuesday, March 19, 2013 at 9:12pm by JEILEN

Chemisry
Potassium, a silvery metal, reacts with bromine, a corrosive, reddish liquid, to yield potassium bromide, a white solid. Write the balanced equation, and identify the oxidizing and reducing agents.
Sunday, March 24, 2013 at 8:35pm by nana

chemistry
how would you make one gram potassium chloride with barium chloride and potassium carbonate
Thursday, May 5, 2011 at 10:09am by jc

chemistry
how would you make one gram potassium chloride with barium chloride and potassium carbonate
Thursday, May 5, 2011 at 10:11am by jc

Physics
When light of wavelength 391 nm falls on a potassium surface, electrons are emitted that have a maximum kinetic energy of 1.72 eV. 1) What is the cutoff wavelength of potassium? Answer in units of nm 2)What is the threshold frequency for potassium? Answer in units of Hz ...
Friday, May 11, 2012 at 10:02pm by Jason

Chemistry
1. What amount of Potassium Chloride forms when 5.25 litres of Chloride gas at 0.95 atm and 293K reacts with 17.0g of Potassium.
Wednesday, August 3, 2011 at 7:37am by Kam

Earth Science
If you started with 100 grams of Potassium-40 how much would reamin Potassium-40 after 3.9 x 10 to the 9th years?
Friday, May 25, 2012 at 3:13pm by Donna

chemistry
3 Cl2 + 6 KOH go toKClO3 + 5 KCl + 3 H2O How many moles of potassium chlorate form when 2 moles of potassium hydroxide react completely?
Saturday, November 24, 2012 at 8:41pm by linda

physical science
calculate the mass and volume of oxygen released when 29;4g potassium chlorate decomposes to form potassium chloride and oxygen
Monday, September 30, 2013 at 11:21pm by asanda

chemisty
is this correct?: word equation: nitric acid+potassium hydroxide= potassium nitrate balanced symbol equation: 3HNO3+2KOH=2KNO3+H2O
Sunday, June 7, 2009 at 7:20am by andra

Chemistry
Aqueous potassium sulfate can be prepared by titrating dilute sulfuric acid against aqueous potassium carbonate. What conclusion can e drawn from here? And explain why is it so.
Wednesday, September 7, 2011 at 9:55am by StuartKess

chemistry
how many moles of potassium carbonate will be produced if 400.0 g of potassium hydrogen carbonate are heated
Tuesday, October 6, 2009 at 5:56pm by Tierney

CHEM
how many gram of potassium bromide can be made from 13.7 grams of potassium and unlimited bromide
Monday, March 22, 2010 at 12:19am by Sienna

chemistry
What combination of atoms are involved in this compound? KCl A.1 potassium atom and 2 chlorine atoms B.2 potassium atoms and 1 chlorine atom C.1 potassium atom and 1 chlorine atom D.2 potassium atoms and 2 chlorine atoms
Monday, May 28, 2012 at 11:16pm by lalt

chemistry Molarity
You have 353 mL of a 1.25 M potassium Chloride solution, but you need to make a 0.50 M potassium Chloride solution. How many milliliters of water must you add to the original 1.25 M solution to make the 0.50 M potassium Chloride solution
Saturday, December 11, 2010 at 2:17pm by Kevin

chemistry
24ml of .05 mol per litre of SILVRE NITRATE reacts with 15 ml of potassium chloride.calculate molar concentration of potassium chloride.
Monday, April 4, 2011 at 9:07am by Anonymous

chemistry
24ml of .05 mol per litre of SILVRE NITRATE reacts with 15 ml of potassium chloride.calculate molar concentration of potassium chloride.
Monday, April 4, 2011 at 9:12am by kalsoom

chemistry
0.125g of sodium dichromate is to be reacted wtih 0.025M potassium iodide. How many mLs of the potassium iodide solution will be needed. (Use your balanced equations above.)
Monday, June 17, 2013 at 4:41pm by Annie

Science
Compounds are such substances that can't be separated by chemical means like potassium chloride, sodium chloride(common salt), potassium aluminium sulphate(alum).
Friday, October 25, 2013 at 3:22pm by Uddeshya

Science
Compounds are such substances that can't be separated by chemical means like potassium chloride, sodium chloride(common salt), potassium aluminium sulphate(alum).
Thursday, October 3, 2013 at 1:36pm by Hailey

science-chem
if i am given 2 pairs of aqueous solutions and I need to know which one has lower electrical conductivity? Are my answers correct? Ex/1M magneisium bromide and 1M lithium bromide.....Litium Bro. has lower electrical conductivity Ex? 1M Potassium phosphate or 1 M potassium ...
Thursday, September 17, 2009 at 3:08pm by Ally

solubility graph
A maa of 30 g of potassium nitrate is dossolved in 100 cm3 of water at 100gC. How many more grams of potassium nitrate must be added to saturate the solution?
Monday, November 10, 2008 at 5:04pm by tony

Chemistry
A saturated solution of potassium nitrate in water is prepared at 70.0*C then cooled to 55.0*C how many grams of potassium nitrate crystallized--- how do I determine this using my graph with everyone's numbers
Wednesday, May 8, 2013 at 3:17pm by Melissa

chemistry
balanced equation for potassium nitrate(s)--->potassium nitrate(s)+oxygen(g)
Thursday, November 8, 2012 at 10:32pm by lisa

Chemistry
A solution contains the following ions: Hg2(2+) and Fe(2+). When potassium chloride is added to the solution, a precipitate forms. The precipitate is filtered off and potassium sulfate is added to the remaining solution, producing no precipitate. When potassium carbonate is ...
Friday, October 1, 2010 at 6:23pm by June

Chemistry
What is the thermal stability of potassium phosphate and why? Thanks. I assume you mean as a powder, not as an water solution. Potassium phosphate is deliquescent. At elevated temperatures, phosphorus oxides are released as the compound decomposes. How elevated? I want to ...
Wednesday, July 4, 2007 at 10:58am by Cheryllyn

chemistry
calculate the number of moles of potassium iodate (KIO) that were present in the 5.00mL aliquot of standar potassium iodate solution Can someone please show me the workings to do questions like this one? thanks =]
Wednesday, November 16, 2011 at 10:54pm by Yul

chemistry
calculate the number of moles of potassium iodate (KIO) that were present in the 5.00mL aliquot of standar potassium iodate solution Can someone please show me the workings to do questions like this one? thanks =]
Wednesday, November 16, 2011 at 10:57pm by me

chemistry
1 mol Potassium = 39g [Atomic Mass of K] x mol Potassium = 25g x = 25*1/39 = 0.641 mol Hope that helps.
Thursday, March 12, 2009 at 10:01pm by GanonTEK

Chemistry
10.1g of potassium nitrate were dissolved in 50cm^3 of water. the temperature fell by 16 degrees celsius. Determine (a) the number of moles of potassium nitrate dissolve in 50cm^3 of water. (b) heat change that would be produced if one mole of potassium Nitrate dissolve ...
Tuesday, March 25, 2014 at 11:51am by Jessica

Chemistry
A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 2. Calculate the % concentration of this solution. 3. Calculate the ...
Monday, January 31, 2011 at 1:02pm by Paul

chem
Sorbic acid, HC6H702 (pKa=4.77), is widely used in the food industry as a preservative. For example, its potassium salt (potassium sorbate) is added to cheese to inhibit the formation of mold. What is the pH of 0.37M KC6H702(aq)?
Sunday, February 21, 2010 at 5:22pm by Rav

Chemistry
A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 2. Calculate the % concentration of this solution. 3. Calculate the ...
Monday, January 31, 2011 at 9:59pm by Paul

Chemistry
A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 2. Calculate the % concentration of this solution. 3. Calculate the ...
Tuesday, February 1, 2011 at 4:42am by Paul

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