Search: chem - precipitation problems

Number of results: 23,061

chem - precipitation problems
I would average the five runs to give g/s, then divide by 239.27 to change to moles/s.
Tuesday, June 8, 2010 at 4:49pm by DrBob222

Chemistry
The Cu2+ ion can be separated from Ag+, Ca2+, and K+ in aqueous solution by 1. precipitation of Cu2+ as Cu(OH)2(s) with 6 M NaOH(aq). 2. precipitation of Ag+, Ca2+, and K+ as the carbonates. 3. None of these procedures will separate Cu2+ from the other ions. 4. precipitation ...
Monday, April 5, 2010 at 6:17pm by Christina

chemistry
The solubility products of AgBr and Ag3PO4 are 5.0 10-13 and 1.8 10-18, respectively. If Ag+ is added (without changing the volume) to 1.00 L of a solution containing 0.31 mol Br ‾ and 0.31 mol PO43-, calculate the molarity of Ag+ ions required to initiate ...
Sunday, March 25, 2012 at 3:40pm by Tanner

chem
its not also a precipitation os single-displacement??
Tuesday, November 30, 2010 at 5:06pm by hannah

chemistry
The net ionic equations for the following 1. Dissolution of silver oxalate with nitric acid 2. Complexation of the iron(III) by the thiocyanate ion 3. Precipitation of the carbonate ion with barium ion 4. precipitation of the oxalate ion with barium ion 5. precipitation of the...
Tuesday, November 30, 2010 at 12:03pm by Jake

ap stats-- probability
over a 5 year period of time, 80% of winter days in Philadelphia had an average temperature above freezing. 20% of those days had precipitation. Of the days with an average temperature below freezing, 15% had precipitation. A winter day is chosen at random. Find the ...
Wednesday, October 24, 2012 at 2:52pm by zack

Chemistry
The Cu2+ ion can be separated from Ag+, Ca2+, and K+ in aqueous solution by 1. precipitation of Cu2+ as Cu(OH)2(s) with 6 M NaOH(aq). Cu(OH)2 will ppt but so will Ag(OH)2/Ag2O. 2. precipitation of Ag+, Ca2+, and K+ as the carbonates. CuCO3 will ppt with Ag2CO3 and K^+ will not...
Monday, April 5, 2010 at 6:17pm by DrBob222

science
humidity is the amount of water vapor in the air at a given time.if the air at 75 degrees holding the maximum amount of moisture that it can,and the temperture suddenly drops to 60degrees,what is likely to be the result? a)precipitation will be released in the form of hail. b)...
Thursday, October 11, 2007 at 8:32pm by yaz

Chem
A lake may be polluted with Pb2+ ions. what precipitation reaction might you use to test for the presense of Pb2+?
Sunday, October 9, 2011 at 12:02am by Josh

AP Chem
I looked at the first four, they are right. Dont you work with someone on chem homework? Like a study group? That is a very effective way to work chem and physics problems.
Wednesday, November 19, 2008 at 11:22am by bobpursley

Chem HELP!!!!!!!
To 0.350L of 0.150M NH3 is added 0.150L of 0.100M MgCl2. How many grams of (NH4)2So4 should be present to prevent precipitation of Mg(0H)2(s)?
Saturday, April 18, 2009 at 6:17pm by Angel

chemistry
if heat of precipitation of AgCl=-36k.j/mole find heat of precipitation of 287 gm of AgCl knowing that (Ag=108 . CL35.5)
Sunday, April 8, 2012 at 5:58pm by habiba

Statistics
The annual precipitation for one city is normally distributed with a mean of 72 inches and a standard deviation of 3.5 inches. In 95% of the years, the precipitation in this city is between___ and ___
Monday, July 23, 2012 at 7:51pm by Marc

chemestry
When you lowered the pH of your combined aqueous NaOH extracts, you observed precipitation of benzoic acid. Explain what happened during this acidification and why the precipitation of benzoic acid occurred.
Wednesday, March 30, 2011 at 6:32pm by Ami

Chemistry
A solution contains 0.022 M Ag and 0.033 M Pb2 . If you add Cl–, AgCl and PbCl2 will begin to precipitate. What is the concentration of Cl– required, in molarity, when A. AgCl precipitation begins? B. AgCl precipitation is 99.99% complete? C. PbCl2 precipitation ...
Sunday, April 21, 2013 at 6:10pm by Sally

chem - precipitation problems
When hydroge sulfide gas is passed through a solution of lead (II) nitrate, lead (II) sulfide precipitates out. Write a balanced equation for this reaction and calculate an average rate, in mol/s for the reaction from this data: 1) at 0 seconds, mass of lead (II) sulide is 0 g...
Tuesday, June 8, 2010 at 4:49pm by Capella

earth science
What may form when falling precipitation runs off the surface of the ground? Explain how the form of precipitation may affect runoff. I don't understand what they are asking. What do they mean by "What may form?" does it mean like a puddle? or mudslide? or ...
Wednesday, September 16, 2009 at 6:30pm by Michelle

MATH
MT WAIALEALE,HAWAII HAS A VERY DAMP CLIMATE. WITH AN AVERAGE ANNUAL RAINFALL OF 11,684 MILLIMETERS. RICHMOND VIRGINIA AVERAGES ABOUT 508 MM OF PRECIPITATION. HOW MANY TIMES GREATER IS THE PRECIPITATION AT MT WAIALEALE?
Tuesday, October 11, 2011 at 3:04pm by NICK C

chem
In order for a precipitation reaction to occur the product must be insoluble. However in an experiment we formed precipitates of two compounds, KNO3 and NaCl which are soluble? How did this occur? What was the forcing condition in each case?
Tuesday, March 23, 2010 at 2:20pm by kohel

Chemistry
CaCl2(aq)+ Cs3PO4(aq) ---> Complete the reaction and classify as precipitation or acid/base. Net ionic equation as well. I believe this is a precipitation reaction since there is no H. Believe the products may be CaPO4 and Cs3Cl2? Can someone help explain this to me, ...
Tuesday, November 3, 2009 at 12:34pm by Meaghan

Environmental Science
18. Which of the following is NOT an effect of acid precipitation? a. loss of animal and plant populations and aquatic ecosystems b. acidiciation of soil c. health problems and poisoning of the human body d. increased occurrences of storms, rain, hurricanes, natural disasters ...
Thursday, January 21, 2010 at 6:06pm by y912f

chemistry
group 1 cations: im doing a lab report for a experiment we did today. we had a known and we checked it for pb^+2, Hg2^+2, and Ag^+1. we have to write our observations for: A Precipitation of group 1. what does this mean? i understand the other questions, the others are about ...
Friday, October 22, 2010 at 9:48pm by JES

chem
Ca(s) + 2 H2O(l) Ca(OH)2(aq) + H2(g) acid-base double-displacement gas evolution oxidation-reduction precipitation single-displacement synthesis whichs one(s) is it?? thanks
Tuesday, November 30, 2010 at 5:06pm by hannah

UCF
6) The annual precipitation amounts in a certain mountain range are normally distributed with a mean of 88 inches, and a standard deviation of 10 inches. What is the likelihood that the mean annual precipitation during 25 randomly picked years will be less than 90.8 inches?
Monday, June 18, 2012 at 7:19pm by John

statistics
The annual precipitation amounts in a certain mountain range are normally distributed with a mean of 88 inches, and a standard deviation of 10 inches. What is the likelihood that the mean annual precipitation during 25 randomly picked years will be less than 90.8 inches?
Saturday, June 9, 2012 at 3:05pm by Jameson

chem
or acid- base? because i did gas evolution oxidation-reduction precipitation single-displacement but got it wrong so I am thinking either one of those has to be taken out and/or acid-base added
Tuesday, November 30, 2010 at 5:06pm by hannah

geography
what happens the the mass of moist air with the type of precipitation relief? what happens the the mass of moist air with the type of precipitation frontal? what happens the the mass of moist air with the type of precipitation convectional?
Saturday, October 27, 2012 at 2:53pm by zackary

chmistry
We can't draw structures on this forum but here is a link where one is drawn for you. http://www.chem.umass.edu/~dgross/chem111/problems/Chap10.probs.pdf
Tuesday, May 14, 2013 at 8:12pm by DrBob222

Chemistry
I'm lost!!! Not sure if I'm just losing concentration after 50 chem problems or losing my mind with 3 kids running around still and a chem exam at 8am!!!
Friday, March 29, 2013 at 12:15am by Ryan Curry

Chem.
The instructions are: Rewrite the followong units with "SI prefixes". then some of the problems given are as follows: (a) 36582472 g (b) 0.000000452 m (c) 4.62 X 10^-3 s (I do not understand how to approach these problems.What does it mean by "SI prefixes"?)
Monday, September 14, 2009 at 11:17pm by Sam

Chem
Using general solubility rules, write the balanced molecular equation when the following aq solutions are mixed. Underline the formula of the solid. If no precipitation reaction is likely, explain why. A. NHY4Cl, H2SO4 B. K2CO3, SnCl4 C. NH4Cl, Pb(NO3)2 D. CuSO4, KOH E.Na3PO4...
Wednesday, June 25, 2008 at 2:57pm by OliviaK

Chemistry
In the qualitative analysis scheme, what qualitative analysis principles are used to seperate Cu2+ from Al3+? Check all that apply. -Selective precipitation -Fractional precipitation -Amphoteric precipitate solubilization -Competitive equilibrium solubilization: anoion ...
Wednesday, April 24, 2013 at 9:51pm by Help

Chemistry
You isolate an acidic compound in an experiment by first separating it from the organic layer. Then you have a solution containing a salt of an acid. You acidify it using concentrated HCl. A precipitation begins to form while the solution is still basic.. why? You continue the...
Sunday, October 23, 2011 at 1:41pm by Rachel

French
Bonjour! So for my homework assignment I'm writing a letter to the clouds because I'm angry about waking up to snow this morning. We just have to use vocab words. Anyway, I'm stuck on how to say this: Please keep your precipitation to yourself My best attempt is: S...
Thursday, April 21, 2011 at 11:46am by Samantha

Chemistry
As for chem I vs chem II, I think you are expected to know the material from I going into II. And this is another of the problems with the test. How many profs around the country start and stop the semester with the same number of topics and to the same depth?
Thursday, April 19, 2012 at 8:27pm by DrBob222

ap chem
A 1.42 g. sample of a pure compound, with formula M2SO4, was dissolved in water and treated with and excess of aqueous barium chloride, resulting in the precipitation of all the sulfate ions as barium sulfate. The precipitate was collected, dried, and found to weigh 2.33-g. ...
Monday, October 11, 2010 at 6:20pm by josh sears

AP Chem
Whew. long question. Barium carbonate is the source of barium compounds. It is produced in an aqueous precipitation reaction from barium sulfide and sodium carbonate. (Barium sulfide is a soluble compound obtained by heating the mineral barite, which is barium sulfate, with ...
Tuesday, October 28, 2008 at 12:02am by Anna-Marie

Earth Science
A.________-large body of air that develops over a particular region; it acquires the characteristics of the area over which it occurs B.__________-boundary between different air masses 1.___-cold air mass pushes under a warm air mass and can cause a narrow band of violent ...
Tuesday, January 8, 2008 at 8:51pm by Rhiana

Chemistry
A solution contains 0.0500 M Ca2 (aq) and 0.0350 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate? What percentage of the Ca2 (aq) can be separated from the Ag (aq) by selective precipitation? -Solving the 1st one I got [Ca2+]= 5.03x10...
Friday, April 6, 2012 at 4:36pm by Jematormal91

AP Chem
I know this might sound easy... but i need these problems for bonus and i want to make sure they are right Silver nitrate reacts with strontium chloride in an aqueous precipitation reaction. What are the formulas of silver nitrate and strontium chloride? Write the molecular ...
Monday, October 27, 2008 at 10:50pm by Anna-Marie

Chem
A And B are my main problems
Monday, December 3, 2012 at 12:15am by Jason

Chemistry
Co-precipitation is the process by which undesirable materials are "carried down" and trapped on the suface or within the desired precitate. The precipitate is washed with distilled water to remove the co-precipitates which are more soluble that the precipitate. Care...
Wednesday, December 8, 2010 at 11:12am by Patrick

Chemistry
Co-precipitation is the process by which undesirable materials are "carried down" and trapped on the suface or within the desired precitate. The precipitate is washed with distilled water to remove the co-precipitates which are more soluble that the precipitate. ...
Tuesday, December 7, 2010 at 1:11pm by Patrick

chemistry
Co-precipitation is the process by which undesirable materials are "carried down" and trapped on the suface or within the desired precitate. The precipitate is washed with distilled water to remove the co-precipitates which are more soluble that the precipitate. Care...
Tuesday, December 7, 2010 at 12:00am by Patrick

Math
Add or subtract Write in simplest form Weather in January through March Death Valley gets a total of about 21/25 inch of precipitation. In April through June it gets a total of about 6/25 inch. How much more precipitation occurs in January through March 3/5?
Tuesday, October 23, 2012 at 6:44pm by Jerald

AP CHEM
Please help me with these AP CHEM homework problems problems and show me the steps: Mass per Volume Results for Titrations: Determine the mass per volume results requested in the following problems. #23) A particular water supply is found to contain 0.000160 MAs, what is the ...
Thursday, July 31, 2008 at 10:39am by shylo

chem
Cola contains H3PO4. In order to determine the concentration of phosphoric acid in 50.0 mL of cola, a precipitation reaction with excess silver nitrate was carried out. The product, silver phosphate, was dried and found to weigh 0.0576g. What is the concentration of phosphoric...
Tuesday, October 6, 2009 at 1:38pm by Anonymous

Chem Lab
I need help with these problems as soon as posible Please
Monday, October 8, 2012 at 10:37pm by Aliya

CHEM-KSP/KA PROBLEMS
sorry didn't mean to respost this
Tuesday, April 8, 2008 at 8:41pm by Sigurd

7th grade science weather
1. Relative humidity is a measure of the amount of _______ that air is holding compared to the amount needed for saturation at a specific temperature. water vapor particles heat none of the above 2. Low, layered gray clouds that produce light precipitation are _____ clouds. ...
Friday, September 28, 2012 at 7:08pm by Delilah

Geo
1. What factor controls the amount of humus you find in an area? For this question i think the factor is precipitation. Is that correct? 2. Why do vegetation change with increasing elevation? please help. thanks in advance. http://www.google.com/search?hl=en&rls=com....
Tuesday, May 22, 2007 at 7:10pm by Mae

Chem
Sodium phosphate reacts with copper (II) chloride in a precipitation reaction. What mass (in grams) of the precipitate will form when 325 mL of 0.5000 molar sodium phosphate reacts with 41.5 cL of 0.6000 molar copper (II) chloride.
Tuesday, November 23, 2010 at 4:05pm by Heather

Chemisty
Let's explore the efficiency of chloride ion precipitation in seperating Ag^+ from Pb^2+ in a solution. Suppose that [Pb^2+]= 0.045 mol/L and [Ag^+]= 0.084 mol/L. Calculate the chloride ion concentraion required to just start precipitation of Pb^2+ ion and then calculate ...
Sunday, March 4, 2012 at 3:15pm by Tanner

Chem
If a precipitation reaction occurs, when a solution of one substance is added to a solution of the other, enter the formula and state of the spectator ions. Separate by comma. If there is no reaction, enter the formula and state of all ions in solution. CoI2(aq) + Pb(NO3)2(aq...
Thursday, February 18, 2010 at 5:54am by Keri

Chemistry
Consider the standard cell at 25C based on the following half-reactions. Pb^2+ + 2e^- --> Pb E=-0.13V Zn^2+ + 2e^- --> Zn E=-0.76V To the standard cell, OH-, is added to the zinc compartment causing precipitation of Zn(OH)2. After precipitation is complete, the ...
Tuesday, May 10, 2011 at 8:19pm by JRoussel

AP Chem
Thanks for walkin me through that one =]. It helped a lot with the other problems like that too.
Monday, November 3, 2008 at 11:02pm by Anna

Science(chem)
You should state your thinking on the problems. We don't Do your homework for you but rather help you but you have to show what you did.
Wednesday, March 12, 2008 at 12:37am by ~christina~

English Language
I asked this question earlier. I need to write 2 letters of complaint about problems I face at school and problems I face as a student in general but I can't find any problems, could you help me list some problems? Its really really urgent.
Monday, February 9, 2009 at 7:57pm by PLEASE HELP ME!!!

math
there's a question that I don't understand and the direction says that 'solve problems as combination integer problems.remember to rewrite all double sign problems as combination problems before solving' and here's a question 50- -61+ - 170 =
Tuesday, January 22, 2008 at 10:03pm by allie

Math
how do you do these problems?? 5-26 2-2/9 8-2/3 4/3+6 But I can do these types pf problems ( don't need help with problems below) 3/4 + 1/10 and 5/6 - 1/4 Please Help!! Thanks!!!
Thursday, December 2, 2010 at 7:03pm by Erin

studying for chem 2
My professor really likes conceptual problems and that is what we will be tested on. How can I practice concept questions??
Saturday, September 17, 2011 at 4:14pm by Lauryn

chem
There is no reason to be confused. Just remember to use logic to think your way through problems.
Thursday, May 29, 2008 at 9:59pm by DrBob222

chem
I am having lots of trouble with these questions: Classify each of the following reactions in as many ways as possible. (Select all that apply.) a)2 Rb(s) + Br2(g) 2 RbBr(s) you can select: -acid-base -double-displacement -gas evolution -oxidation-reduction -precipitation -...
Monday, November 29, 2010 at 5:11pm by hannah

chem
Classify each of the following reactions in as many ways as possible. (Select all that apply.) CuO + 2 HCl --> CuCl2 + H2O you can select: -acid-base(unsure because there is an acid but im not sure if theres a base) -double-displacement -gas evolutionx -oxidation-...
Tuesday, November 30, 2010 at 4:12pm by hannah

Science
b precipitation
Tuesday, February 21, 2012 at 6:24pm by jennifer

chem
If you search around, Dr. Bob222 has posted some nice links on how to solve these types of problems.
Tuesday, March 19, 2013 at 7:43pm by Devron

chem - check euqation please
I think what you have shown will not work. There are many Pb^+2 solutions that coexist with Hg(NO3)2. I would suggest adding sulfate ion, chromate ion, chloride ion, iodide ion, bromide ion, carbonate ion, etc for the precipitation of lead(II) ion. The sodium salt would work ...
Wednesday, May 28, 2008 at 4:34pm by DrBob222

Mathematics
Maria answered all the problems on her math test. She answered 80 percent of the problems correctly. If she answered 6 problems incorrectly, how many problems were on the test?
Thursday, July 19, 2012 at 7:27pm by Willie

Science
precipitation
Sunday, April 19, 2009 at 7:20pm by Ms. Sue

Chemistry
How can i calculate the concentration of each ions remaining in the solution after precipitation is complete? ok heres the full question:: 2KOH + Mg(NO3)2 -------------> 2KNO3 + Mg(OH)2 a 100.0 mL aliquot of 0.200 M aqueous potassium hydroxide is mixed with 100.0mL of 0...
Tuesday, August 24, 2010 at 1:09pm by Crickett

chemistry
How can i calculate the concentration of each ions remaining in the solution after precipitation is complete? ok heres the full question:: 2KOH + Mg(NO3)2 -------------> 2KNO3 + Mg(OH)2 a 100.0 mL aliquot of 0.200 M aqueous potassium hydroxide is mixed with 100.0mL of 0...
Tuesday, August 24, 2010 at 12:03am by Crickett

Math
I am having problems understanding how to solve problems like the following: a2 + b2 = c2 Please help me where I can understand solving problems such as the one above.
Monday, March 30, 2009 at 9:27pm by Jasmine

AP Chem
I always called these problems railroad problems for I thought they were designed to "railroad" me out of the class. These must be done is small parts. Use the initial information about nitrogen to determine the volume of the container using PV = nRT. Knowing that, ...
Monday, January 21, 2008 at 12:06pm by DrBob222

science
http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=science+fair+project+plants+precipitation Read widely and make a good choice.
Sunday, April 24, 2011 at 12:17pm by Writeacher

earth science
Try some of the following links: http://search.yahoo.com/search?fr=mcafee&p=why+do+cloulds+and+precipitation+usually+occur+along+frontal+surface+ Sra
Wednesday, March 2, 2011 at 6:48pm by SraJMcGin

8th Grade Algebra
I am having problems understanding how to solve problems like the following: a2 + b2 = c2 Please help me where I can understand solving problems such as the one above.
Wednesday, March 25, 2009 at 8:16pm by Jasmine

chem
do you know how to do it using hte numbers. I know for some problems uneeded information can be added but usually if its more than 2 peices then you use at least one of them
Monday, September 10, 2012 at 5:43pm by sara

chem
By the way, it helps us if you post under the same screen name; otherwise, we get the problems confused as we go from one to the other.
Saturday, September 20, 2008 at 5:01pm by DrBob222

science
humidity is the amount of water vapor in the air at a given time. at warm temperatures, air can hold more moisture than it can at cold temperatures. Relative humidity is the amount of vapor the air is holding expressed as a percentage of the amount the air is capable of ...
Thursday, May 1, 2008 at 2:49am by barby

chemistry
Precipitation Reactions Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no reaction occurs, write NO REACTION. Express your answer as a chemical equation. Identify all of the phases in your answer. ...
Monday, February 9, 2009 at 2:10am by Jake

Geography.
pls help me.. what are the factors that affect precipitation?
Wednesday, May 9, 2007 at 10:34pm by lilibeth

chemistry
can you explain where did the 2 come from also the 3, i'm not an expert at chemistry and i need explaination to see how to do these problems. thank you
Monday, April 19, 2010 at 10:58am by chem help

math
matthew got 36 problems right out of a total of 40 problems on a test. What percent of the problems did he get right?
Sunday, November 14, 2010 at 7:52pm by Michelle

7th grade science fair project
precipitation
Tuesday, December 1, 2009 at 2:01pm by Jaron

social studies
temperature, precipitation, wind
Sunday, March 1, 2009 at 9:20pm by Ms. Sue

Geography- Canada
what are the factors of precipitation in Regina?
Saturday, November 22, 2008 at 8:29pm by hassan altaf

Math Help please!!
how do you do these problems?? 5-26 2-2/9 8-2/3 4/3+6 But I can do these types pf problems ( don't need help with problems below) 3/4 + 1/10 and 5/6 - 1/4 Please Help!! Thanks!!!
Thursday, December 2, 2010 at 7:19pm by Erin

Writing
I'd give this a 3. Introduction includes some slang/diction problems. Other paragraphs include further slang/diction problems, strange reference to time (in 2nd paragraph), at least one sentence fragment, some punctuation problems, some spelling problems. Is apathy the ...
Tuesday, September 9, 2008 at 4:38pm by Writeacher

analytical chemistry
chemical equilibria involved in precipitation reaction
Monday, April 22, 2013 at 6:13pm by rose

geography
What regions have low or high annual precipitation?
Saturday, April 13, 2013 at 7:36pm by lauren

chemistry
Why Al(OH)3 precipitation is red ? Is this the result of electron transition? Thanks for your help :)
Friday, October 19, 2012 at 1:24pm by Negah

chemistry
what is a double replacement precipitation reaction and limiting reactants
Thursday, November 17, 2011 at 4:50pm by joe

Social STUDIES
Which state has the highest average annual precipitation?
Tuesday, November 1, 2011 at 5:08pm by Mya

Biology
sun, precipitation, rocks, soil, temperature
Sunday, June 26, 2011 at 2:53pm by Ms. Sue

chemistry
what is the mechanism of urea based precipitation of copper nitrate?
Wednesday, March 2, 2011 at 1:51am by zia

earth science
The area where precipitation and storms occur is a ? syestem.
Thursday, March 13, 2008 at 6:50pm by kayshell93

world history
Re: Industrial Revolution Apart from external problems including urban crowding, insanitation, pollution, and social and order problems, what may have also been (2) problems created by industrialization/urbanization during this time?
Saturday, February 9, 2008 at 8:16pm by hellga

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