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August 30, 2014

Search: chem - precipitation problems

Number of results: 11,520

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 precipitation ...
March 25, 2012 by Tanner

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 ...
April 5, 2010 by Christina

Science asap
1. Which of the following describes the correct sequence of events during the water cycle? precipitation → condensation → evaporation → runoff condensation → precipitation → runoff → evaporation runoff → condensation → ...
March 12, 2014 by anonymous

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...
November 30, 2010 by Jake

someones GOTTA help me with this science...!!!
1. Which of the following describes the correct sequence of events during the water cycle? (1 point)precipitation ¨ condensation ¨ evaporation ¨ runoff condensation ¨ precipitation ¨ runoff ¨ evaporation runoff ¨ condensation ¨ evaporation ¨ precipitation evaporation...
January 20, 2014 by TTR+S<3

Science :(
Which of the following describes the correct sequence of events during the water cycle? precipitation → condensation → evaporation → runoff condensation → precipitation → runoff → evaporation runoff → condensation → evaporation...
March 11, 2014 by anonymous

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 begins? D. ...
April 21, 2013 by Sally

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)?
April 18, 2009 by Angel

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...
June 8, 2010 by Capella

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 ...
October 24, 2012 by zack

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

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)...
October 11, 2007 by yaz

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
November 30, 2010 by hannah

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?
October 11, 2011 by NICK C

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 ___
July 23, 2012 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.
March 30, 2011 by Ami

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)
April 8, 2012 by habiba

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?
March 23, 2010 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, having...
November 3, 2009 by Meaghan

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 something?
September 16, 2009 by Michelle

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 ...
January 21, 2010 by y912f

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 ...
October 27, 2008 by Anna-Marie

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 ...
October 22, 2010 by JES

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 ...
July 31, 2008 by shylo

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 ...
October 28, 2008 by Anna-Marie

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?
June 9, 2012 by Jameson

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?
June 18, 2012 by John

math
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?
June 23, 2013 by Anonymous

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...
June 25, 2008 by OliviaK

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...
April 6, 2012 by Jematormal91

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 ...
May 10, 2011 by JRoussel

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. ...
October 11, 2010 by josh sears

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?
October 27, 2012 by zackary

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'il vous ...
April 21, 2011 by Samantha

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...
October 23, 2011 by Rachel

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 ...
April 24, 2013 by Help

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...
October 6, 2009 by Anonymous

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 ...
January 8, 2008 by Rhiana

math
thanks damon! u rock! another quick question....how do you estimate the total precipitation in inches and the total number of days with precipitation asheville and wichita asheville= 47.71 inches 124 days wichita = 28.61 inches 85 days
August 18, 2014 by lauren

Math plz help
In the town of Mayfield, the precipitation totals are set to zero at the beginning of each year. Because of a drought early in the year, the totals on March 31st were below normal at -27 inches. The next three months were very rainy, and by July 1st the precipitation totals ...
December 15, 2013 by Eden S.

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??
September 17, 2011 by Lauryn

Chemistry
Consider a groundwater saturated with respect to PbSO4 (Ksp= 1.7*10^-8) mixing with a groundwater saturated with respect to CaSO4 (Ksp=10^-5). Assume a 50:50 mixture between the waters such as 500mL of each water mixing to form a 1.0L solution a. What is the saturation index (...
April 8, 2014 by Me

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.
November 23, 2010 by Heather

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 must be ...
December 7, 2010 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 must be ...
December 7, 2010 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 must be ...
December 8, 2010 by Patrick

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 the ...
March 4, 2012 by Tanner

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?
October 23, 2012 by Jerald

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...
February 18, 2010 by Keri

Geo
Just a quick question that will help me in my essay. I just need a quick answer not an explination, Im just using this answer as a quick refernce. Question: What is the most common precipitation in New Brunswick. I just need a quick answer. Rain When I say precepitation I mean...
January 14, 2007 by London

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 =
January 22, 2008 by allie

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.microsoft%...
May 22, 2007 by Mae

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.
February 9, 2009 by PLEASE HELP ME!!!

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-reduction ...
November 30, 2010 by hannah

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.
March 30, 2009 by Jasmine

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 -...
November 29, 2010 by hannah

Chem
I've been having trouble setting up word problems. Here is one problem I need help with. How many Bromide ions are in a sample of CaBr2 that has a mass of 10.0g?
November 18, 2010 by Nescha

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. ...
September 28, 2012 by Delilah

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!!!
December 2, 2010 by Erin

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....
August 23, 2010 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....
August 23, 2010 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....
August 24, 2010 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....
August 24, 2010 by Crickett

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?
July 19, 2012 by Willie

Chemistry
Okay so I'm doing doing significant figures in chem. And I was just wondering for problems like this: .000456 dm + .00524 m Do I have to actually convert stuff? And on the ones with exponents what do I do ? Ex: 3845.2 m cubed/ 25.2354 m
August 27, 2011 by Kendra

algebra
I have a few math questions I made them just like my actual problems so that I can go through the steps you have went through to answer my own problems...Again THESE ARE NOT THE REAL PROBLEMS JUST EXAMPLES LIKE MINE WITH DIFFERENT NUMBERS. I don't know how to complete these ...
June 12, 2013 by Anonymous

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?
February 9, 2008 by hellga

algebra
janice noticed that the number of problems she did for homework (x) formed a linear relationship with her quiz score (y). When she did 3 problems she earned a 25% and when she did 8 problems she earned a 60%. Write an equation to represent this situation.
January 20, 2010 by andrew

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. ...
February 9, 2009 by Jake

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?
November 14, 2010 by Michelle

chem
How many atoms are there in the following problems? which one has the most number of atoms? a. 5 molecuels (NH4)2S b. 9 molecules H2O2 c. 11 molecules O3
October 30, 2012 by chemdummy

chem
How many atoms are there in the following problems? which one has the most number of atoms? a. 5 molecuels (NH4)2S b. 9 molecules H2O2 c. 11 molecules O3
October 30, 2012 by chenchen

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 ...
May 1, 2008 by barby

math
So I've been having trouble solving some problems. Mainly problems that look like this 5-(t+3)=-1+2(t-3) what causes problems is the 5- part. I asked my teacher for help, and he gave me a hint, which is to distribute a -1 like 5+(-1)(t)+(-1)(3) But I still don't get it? Can ...
October 7, 2010 by katherine

Math
Eden took a quiz with 15 problems and got 3/5 of the problems correct.how many problems did she get correct.
February 5, 2014 by Nicole

Geography- Canada
what are the factors of precipitation in Regina?
November 22, 2008 by hassan altaf

Phycis
Precipitation reaction for agno3 and na2co3?
July 24, 2014 by Somila

Statistics-Probability
An instructor will choose 3 problems from a set of 7 containing 3 hard and 4 easy problems. If the selection is made at random, what is the probability that only the hard problems are chosen?
February 5, 2013 by Steven

Math
Kenneth has 22 math problems to do for homework. He has 12 problems done.How many more problems does he left?if he completes 1 problem every minute,how many more minutes does he have to work?
August 27, 2013 by Tanny

math
in the addition problems below each leter represents the same digit in both problems. Replace each letter with a different digi, 1-9, so that both addition problems are true.(there are two possible answers.) A B C A D G +D E F +B E H ------ ------ G H I C F I
August 23, 2007 by kenzie

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

Chem
Calculate ΔG at 25°C for the precipitation of lead(II) chloride from mixing 100. mL of 0.025 M lead(II) nitrate solution with 100. mL of 0.15 M sodium chloride solution. The ΔG° for the reaction at 25°C = −27.36 kJ/mol. (Hint: write out reaction equation – also...
February 23, 2014 by Anonymous

Algebra
Here is the problem: A two-digit number is eight times the sum of its digits.When the number is added to the number obtained by reversing the digits,the sum is 99. Find the original number. Please explain hot to solve it and it would help a lot to if you explain other algebra ...
May 31, 2010 by Anonymous

Algebra
Here is the problem: A two-digit number is eight times the sum of its digits.When the number is added to the number obtained by reversing the digits,the sum is 99. Find the original number. Please explain hot to solve it and it would help a lot to if you explain other algebra ...
May 31, 2010 by Please help

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!!!
December 2, 2010 by Erin

Science-Physics
The metre was originally defined as a fraction of the distance from the North Pole to the equator. What problems would this definition of the metre create for people? Would some problems be the long calculation? I can't really think of other problems.
November 6, 2010 by Anonymous

stoichiometry problems
Hey I hve problems with calculate stoichiometry problems and next week I have a test about it can someone help me out and give me a site where everything is written step by step ....thank u guys :) I REALLY NEED HELP NO JOKING
November 12, 2010 by Tarkan

earth science
The area where precipitation and storms occur is a ? syestem.
March 13, 2008 by kayshell93

chemistry
what is the mechanism of urea based precipitation of copper nitrate?
March 2, 2011 by zia

Social STUDIES
Which state has the highest average annual precipitation?
November 1, 2011 by Mya

chemistry
what is a double replacement precipitation reaction and limiting reactants
November 17, 2011 by joe

geography
What regions have low or high annual precipitation?
April 13, 2013 by lauren

analytical chemistry
chemical equilibria involved in precipitation reaction
April 22, 2013 by rose

Psychology and Health Problems
Summarize the multifactorial model and how it relates to the diagnosis of illnesses. Select two health problems Explain what role psychology has played in understanding and managing these health problems.
June 27, 2008 by Donna

biology
Research indicates that acid precipitation can damage living organisms by what?
September 15, 2008 by claudia

biology
research indicates that acid precipitation can damage living organisms
December 9, 2009 by Anonymous

Chemistry
What pH is required to start precipitation of Fe(OH)3 from a 0.380 M solution of FeCl3? Ksp of Fe(OH)3 = 4.0e-29.
April 3, 2011 by Pob

Chemistry
why do some combinations of ionic compounds form a precipitation while others do not
December 2, 2007 by Jenna

geography
does anyone know what the three parts of climate are? i know two are precipitation and temperature. what is the third part??
December 4, 2007 by Alyssa

science
is the following true or false the most common kind of precipitation is snow
October 7, 2009 by tymera

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