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April 21, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
You are tasked with preparing a 500mL nutrient solution containing 5mg/L of phosphorous (P), 3mg/L nitrate (NO3 -) and 100 mg/L chloride (Cl-). To make this solution, you have powdered sodium chloride, a 100 mg/L solution of phosphorus, a 1000 mg/L of sodium nitrate (NaNO3) ...
Monday, January 13, 2014 at 4:57pm

analytical chemistry
Chemical indicators change color at different points depending upon which indicator is used; therefore, the correct indicator MUST be used to obtain good results. Graphing allows one to calculate the true end point everything else being the same.
Monday, January 13, 2014 at 2:52pm

analytical chemistry
What are the advantages of using graphical endpoint(potentiometric endpoint) compared to usual endpoint(chemical indicator)
Monday, January 13, 2014 at 12:10pm

chemistry
the first oxygen has a -1 charge, the second oxygen has a +1 charge, and the last oxygen has a 0 charge.
Sunday, January 12, 2014 at 7:16pm

Chemistry Damon step by step for me
I agree with Damon. Look how I did NaCl and KCl mixture above.
Sunday, January 12, 2014 at 7:07pm

Chemistry
See the above
Sunday, January 12, 2014 at 7:05pm

Chemistry
CH2ClCHClCOOH
Sunday, January 12, 2014 at 7:05pm

Chemistry Damon step bystep for me
Let X = g NaCl and Y = g KCl --------------- You need two equations. g NaCl + g KCl = 0.887 is #1. g AgCl from NaCl + g AgCl from KCl = 1.822 is #2. For #1 you have X + Y = 0.887 For #2 you have X(MMAgCl/MMNaCl) + Y(MMAgCl/MMKCl) = 1.822 where MM stands for molar mass. Solve ...
Sunday, January 12, 2014 at 7:01pm

Chemistry Damon step by step for me
Hey, this looks just like the last problem with new numbers. If you learn how to do the last one, you can do this one.
Sunday, January 12, 2014 at 4:29pm

Chemistry Damon step bystep for me
A 0.887g sample of a mixture of nacl and kcl is dissolved in water and the solution is treated with an excess of agn03 producing 1.822g of agcl. What is the percent by mas of each compound in the mixture My calculation 1.822g/143g/mol = 0.013M x/58 + y/74 (0.887g-x) = 0.013M I...
Sunday, January 12, 2014 at 4:28pm

chemistry Damon helps me step by step
Wait a minute, x and y are moles and you want percentage of grams perhaps. x = .00377 108 x = .40716 138 y = .6003 so yes, 60% K2CO3
Sunday, January 12, 2014 at 3:53pm

Chemistry Damon step by step for me
First go back and see my change to the earlier problem I did percent of moles and it should be percent of grams. You had the correct answer, 60% I can not do another one right now.
Sunday, January 12, 2014 at 3:24pm

Chemistry Damon
Wait a minute, x and y are moles and you want percentage of grams perhaps. x = .00377 108 x = .40716 138 y = .6003 so yes, 60% K2CO3
Sunday, January 12, 2014 at 3:22pm

Chemistry
i.imgur. com/XwNuqig.gif Just remove the space before the com
Sunday, January 12, 2014 at 3:00pm

Chemistry
Draw condensed structural formula for... 2,3-dichloropropanoic acid I know it is hard to DRAW online, but still you can do something like this... CH-...
Sunday, January 12, 2014 at 2:52pm

Chemistry
Draw condensed structural formula for... 2,3-dichloropropanoic acid
Sunday, January 12, 2014 at 2:49pm

Chemistry Damon step by step for me
you are given a solid that is a mixture of na2s04 and k2s04. A 0.215g sample of the mixture is dissolved in water. An excess of an aqueous solution of bacl2 is added. The bas04 that is formed is filtered, dried and weighed. Its mass is 0.299g. What mass of s04 ion is in the ...
Sunday, January 12, 2014 at 2:42pm

Chemistry Damon
Na2CO3 =2(23)+12+3(16) = 106 g/mol x moles of Na2 CO3 mass = 106 x grams K2CO3 = 2(39)+12+3(16) = 138 g/mol y moles of K2CO3 mass = 138 y grams 106 x + 138 y = 1 gram total in the titration I used 25 mL of my 250 ml so I used 1/10 gram solids of my original carbonates mixture ...
Sunday, January 12, 2014 at 1:57pm

Chemistry Damon
1g of mixture of na2c03 and k2c03 was made upto 250ml is aqueous solution . 25ml of this solution was neutralized 20ml of hcl of unknow concentration. The neutralized solution required 16.24ml of 0.1N AGN03 for precipitation. Calculate a) the k2c03 is mixture b) conc of hcl in...
Sunday, January 12, 2014 at 1:04pm

chemistry Damon helps me step by step
1g of mixture na2c03 and k2c03 was mole made upto 250ml is aqueous solution. 25ml of this solution was neutralized. 20ml of hcl of unknown concentration. The neutralized solution required 16.24ml of 0.1N AGNo3 for precipitation, Calculate a) the % k2c03 is mixture b) conc of ...
Sunday, January 12, 2014 at 11:43am

Chemistry chemical equilibrium
where did you get this question from ?
Sunday, January 12, 2014 at 7:03am

Chemistry
Which method(High Performance Liquid Chromatography or Gas Liquid Chromatography) would be suitable for the separation of the following mixtures? 1) Mixture of paracetamol, codeine and caffeine. 2) Mixture of alpha-pinene, beta-pinene, eucalyptol, alpha-terpineol. Please ...
Sunday, January 12, 2014 at 12:33am

Chemistry
Draw condensed structural formula for... 2,3-dichloropropanoic acid
Sunday, January 12, 2014 at 12:30am

Chemistry
25g of a sample of ferrous sulphate was dissolved in water containing dilute h2s04 and the volume made up to one litre. 25ml of this solution required 20ml of N/10 kmn04 solution for complete oxidation. Calculate the percentage of f2s04 7h20 in the sample 1 g of mixture of ...
Saturday, January 11, 2014 at 11:48pm

Chemistry
How is the high performance liquid chromatography column designed to ensure greater efficiency?
Saturday, January 11, 2014 at 11:19pm

Chemistry
Draw condensed structural formula for... 2,3-dichloropropanoic acid
Saturday, January 11, 2014 at 11:15pm

chemistry who helps me step by step
25g of a sample of ferrous sulphate was dissolved in water containing dilute h2s04 and the volume made up to one litre. 25ml of this solution required 20ml of N/10 kmn04 solution for complete oxidation. calculate the percentage of fe204 7h20 in the sample. My calculation 0.02x...
Saturday, January 11, 2014 at 8:10pm

chemistry
11300
Saturday, January 11, 2014 at 5:49pm

Atomic Model/Science
I dislike Chemistry :O Anyway I do know this: For an atom, the number of natural occurring protons should have the same number of electrons. So your atom should have 92 electrons given if it's not an (ion or man made isotope).
Saturday, January 11, 2014 at 5:23pm

Chemistry
Assuming that seawater has a total ion concentration (aka colligative molarity) of 1.10 M conc, calculate how many liters of seawater are needed to produce 68.7 L of fresh water at 20 C with an applied pressure of 51.0 bar.
Saturday, January 11, 2014 at 2:19pm

Chemistry
What would be the temperature change if 3.0g of water absorbed 15J of heat?
Saturday, January 11, 2014 at 2:04pm

Chemistry
How can reaction intermediates in an organic synthesis be separated and recovered using thin layer chromatography?
Saturday, January 11, 2014 at 9:39am

Chemistry
Consider the reaction 2 Al2O3(s) → 4 Al(s) + 3 O2(g). ∆H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ?
Friday, January 10, 2014 at 5:58pm

Chemistry
w = (6.626x10^-34 J*s)/[(9.109x10^-31 kg)(2.5x10^8 m/s)] = 2.91x10^-12 m
Friday, January 10, 2014 at 5:13pm

chemistry
Automotive air bags inflate when sodium azide, NaN3, rapidly decomposes to its component elements: 2NaN3(s)→2Na(s)+3N2(g) a)How many moles of N2 are produced by the decomposition of 1.60mol of NaN3? b)How many grams of NaN3 are required to form 14.0g of nitrogen gas? c)...
Friday, January 10, 2014 at 5:10pm

Chemistry
How would you define pressure in the unit of thermodynamics? Is it just a force basically?
Friday, January 10, 2014 at 12:21am

AP Chemistry
The ionic substance T3U2 ionizes to form T2+ and U3− ions. The solubility of T3U2 is 4.07×10−20 mol/L. What is the value of the solubility-product constant?
Thursday, January 9, 2014 at 5:56pm

AP Chemistry
What is the value of Ksp for Ag2SO4 if 5.70 g is soluble in 1.00 L of water?
Thursday, January 9, 2014 at 5:47pm

Chemistry
1. State specifically how you would make a conclusive test for an iron (III) salt. 2. Which test for iron (II) ions is conclusive. 3. Suppose you have a solution containing both an iron (II) salt and an iron (III) salt. How would you proceed to identify both Fe2+ and Fe3+ in ...
Thursday, January 9, 2014 at 4:08pm

Chemistry/Math
Hmmmm. Did you read my answer?
Wednesday, January 8, 2014 at 9:41pm

Chemistry/Math
so is my answer correct?
Wednesday, January 8, 2014 at 9:36pm

Chemistry/Math
in 7.500 liters, there are 7500 cm^2, and 7500 grams is 7.5kg
Wednesday, January 8, 2014 at 9:33pm

Chemistry/Math
The density of water is 1 g/cm^3. What is the mass of 7.500 liters of water reported in kilograms? I got 7.5kg. Is this correct?
Wednesday, January 8, 2014 at 9:32pm

Chemistry
falds
Wednesday, January 8, 2014 at 8:43pm

chemistry
I still desperately need help guys! Homework due TOMORROW!
Wednesday, January 8, 2014 at 7:49pm

chemistry
Please explain, in simple English, why is milk a colloid?
Wednesday, January 8, 2014 at 7:30pm

CHEMISTRY
oi
Wednesday, January 8, 2014 at 6:52pm

AP Chemistry
Calculate the solubility product constant for calcium carbonate, given that it has a solubility of 5.3×10^7 g/L of water.
Wednesday, January 8, 2014 at 6:19pm

AP Chemistry
A solution of AgI contains 1.2 mol/L Ag+. Ksp of AgI is 8.3×10^17. What is the maximum I− concentration that can exist in this solution? Answer in units of mol/L
Wednesday, January 8, 2014 at 6:17pm

AP Chemistry
Calculate the concentration of Hg2+ ions in a saturated solution of HgS(s). (Ksp=1.7×10^52) Answer in units of mol/L What volume of solution contains one Hg2+ ion? Answer in units of L/ion
Wednesday, January 8, 2014 at 6:14pm

chemistry
Number 2 may be filtration and distillation, but I'm not 100% sure. As for number 1, I don't think I can help with that one.
Wednesday, January 8, 2014 at 10:18am

chemistry
1. describe in outline a suitable procedure for the preparation of saturated solution of sodium nitrate at 30 degree celsius 2. State 2 techniques that can be used to recover crystals of the sodium nitrate from its saturated solution
Wednesday, January 8, 2014 at 8:40am

Chemistry
some how the question is missing
Wednesday, January 8, 2014 at 6:56am

Chemistry
and the question?
Wednesday, January 8, 2014 at 6:56am

Chemistry
139 g of water at 4.9 degrees Celsius mixed with 241 g of water at 96.0 degrees Celsius (Tf=62.7)
Wednesday, January 8, 2014 at 1:04am

Chemistry
139 g of water at 4.9 degrees Celsius mixed with 241 g of water at 96.0 degrees Celsius (Tf=62.7)
Wednesday, January 8, 2014 at 1:03am

Chemistry
blog? That is a bit odd, to me. I suppose it should read like a daily log, what you did, and learned.
Tuesday, January 7, 2014 at 9:09pm

Chemistry
How do I write a blog for my chemistry project?
Tuesday, January 7, 2014 at 9:08pm

Chemistry
You can get the amount of O in the empirical formula by converting the total moles of H and C to masses and subtracting them from the 1.00g initial mass of the ascorbic acid. Convert this mass to moles, and you have moles of O to work with.
Tuesday, January 7, 2014 at 3:09pm

chemistry
A ternary ionic compound consists of a monoatomic ion plus a cation? true or false.
Tuesday, January 7, 2014 at 9:21am

Chemistry
If you have .1M, and want .01M, that is a dilution of 10. One part .1M silution, nine parts water. One part=10/10 ml .0001 from .1M, that is a thousand dilution, 1 part .1M, and 999 parts water. One part=10ml/1000
Monday, January 6, 2014 at 10:47pm

Chemistry
The answeres to the previous post was not what I am looking for...so please try to help me..... How can I make various concentrations of CuSO4(this is a blue solution)? I know that to make 0.1M you would fill the copper solution up to 10mL in the graduated cylinder and then ...
Monday, January 6, 2014 at 10:34pm

CHEMISTRY
The answeres to the previous post was not what I am looking for...so please try to help me..... How can I make various concentrations of CuSO4(this is a blue solution)? I know that to make 0.1M you would fill the copper solution up to 10mL in the graduated cylinder and then ...
Monday, January 6, 2014 at 8:55pm

Chemistry
The answeres to the previous post was not what I am looking for...so please try to help me..... How can I make various concentrations of CuSO4(this is a blue solution)? I know that to make 0.1M you would fill the copper solution up to 10mL in the graduated cylinder and then ...
Monday, January 6, 2014 at 7:34pm

Chemistry
I am no chemist but as far as I know copper sulphate is a solid. If it is in pure solid form and not as a hydrate we can figure out how many grams in a mole Cu = 63.5 S = 32 4O = 4*16 = 64 total = 159.5 g/mol so if I put 159.5 grams of it in a liter of water (and it dissolved...
Monday, January 6, 2014 at 7:19pm

Chemistry
How can I make various concentrations of CuSO4? I know that to make 0.1M you would fill the copper solution up to 10mL in the graduated cylinder and then add water to the rest..but how can you prepare a 0.01M? 0.001? 0.0001?..........using water and graduated cylinder?
Monday, January 6, 2014 at 7:05pm

Chemistry
How do you express relative amounts pf each element in a compound?
Monday, January 6, 2014 at 6:56pm

chemistry
1- A compound is 87.5% nitrogen and 12.5% hydrogen. The molecular weight of the compound is 32 g/mol. Describe the molecule referencing shape, and inter-molecular forces. 2- Gaseous butadiene, C4H6 , reacts with hydrogen gas in the presence of a platinum catalyst to form ...
Monday, January 6, 2014 at 5:56pm

chemistry
Consider the following reaction: CH3X + Y  CH3Y + X At 25oC, the following two experiments were run, yielding the following data: Experiment 1 : [Y]0 = 3.0 M [CH3X] Time(hr) 7.08 x 10-3M 1.0 4.52 x 10-3M 1.5 2.23 x 10-3M 2.3 4.76 x 10-4M 4.0 8.44 x 10-5M 5.7 2.75 x 10-...
Monday, January 6, 2014 at 5:56pm

chemistry
Acetic acid (CH3CO2H) is a weak acid. As a result, a solution of sodium acetate (NaCH3CO2) will be _____.
Monday, January 6, 2014 at 7:32am

Grade 12 Chemistry
Caprytic acid, also called octanoic acid, is an 8-carbon fatty acid that is used as a sanitizer on dairy equipment that comes in contact with milk.The acid has a molar mass of 144.21 g/mol. An aqueous solution of the sanitizer containing 12.25 g/L has a pH of 2.98. What is the...
Sunday, January 5, 2014 at 6:53pm

chemistry
I'm just saying i know its like 5 and a half years late but for 4 its: Al(HCO3)3 ---> Al2(CO3)3 + CO2 + H2O
Sunday, January 5, 2014 at 3:59pm

chemistry
I'm just saying i know its like 5 and a half years late but for 4 its: Al(HCO3)3 ---> Al2(CO3)3 + CO2 + H2O
Sunday, January 5, 2014 at 3:59pm

Chemistry
Caprytic acid, also called octanoic acid, is an 8-carbon fatty acid that is used as a sanitizer on dairy equipment that comes in contact with milk. The acid has a molar mass of 144.21 g/mol. An aqueous solution of the sanitizer containing 12.25 g/L has a pH of 2.98. What is ...
Sunday, January 5, 2014 at 2:50pm

chemistry Damon check my calculation
recheck you mol mass, in my head I get about 278g/mol
Sunday, January 5, 2014 at 1:27pm

Grade 12 Chemistry
first, the H+ in solution. pH=-log[H] 2.62=-logH H=antilog-2.62= 0.00239883292 Now the H in the aspirin: molesH=3.3/180= you do it. Now divide the H in solution by the H in the aspirin, and forpercent, multiply by 100
Sunday, January 5, 2014 at 1:04pm

Grade 12 Chemistry
This is my question: AspirinTM (acetylsalicylic acid) is a monoprotic acid with molar mass of 180g/mol. An aqueous solution containing 3.3 g/L has a pH of 2.62. What percentage of acetylsalicylic acid molecules ionizes in the solution?
Sunday, January 5, 2014 at 12:40pm

chemistry Damon check my calculation
25g of a sample of ferrous sulphate was dissolved in water containing dilute h2s04 and the volume made up to one litre. 25ml of this solution required 20ml of this solution required 20ml of n/10 kmn04 solution for complete oxidation. Calculate the percentage of f2s047h20 in ...
Saturday, January 4, 2014 at 9:43pm

chemistry
a 350ml buffer solution is .150M in HF and .150M in NAF. What mass of naoh could this buffer neutralize before ph rises above 4.0? So far I got .285714 from 10^-.544. After that I tried to do .285714(x/.0525-x) but this doesn't worl. The answer is 1.2g. Help, please?
Saturday, January 4, 2014 at 4:13pm

Chemistry not math
Please ask for Chemistry, not math, help.
Saturday, January 4, 2014 at 1:42pm

Chemistry
how do you find the molar mass
Saturday, January 4, 2014 at 1:06am

Chemistry
A sample of NH3 gas occupies 75.0 liters at STP. How many molecules is this?
Friday, January 3, 2014 at 5:05pm

chemistry
write the british standard related to following details 1. A plain carbon steel with a composition of 0.46% of carbon and 1.5% of manganese. the steel is supplied to a harden ability specification
Friday, January 3, 2014 at 1:07am

Chemistry
SIR PLEASE EXPLAIN THE ANSWER
Thursday, January 2, 2014 at 9:01pm

chemistry
Calculate the uncertainty in speed of an electron if its position in space is known within the range of ±2pm. Assume me = 9×(10^-31) kg
Thursday, January 2, 2014 at 6:58am

Chemistry
A + B + heat = C Keq = (C)/(A)(B) For endothermic reactions increased T will mean the rxn shifts to the right which makes C larger, A and B smaller so K is larger. For exothermic rxns A + B = C + heat K = (C)/(A)(B) For increase in T rxn shifts to left, C becomes smaller, A ...
Thursday, January 2, 2014 at 12:35am

Chemistry
What is the relationship between temperature and the equilibrium constant k? Is it a direct or indirect relationship? And why?
Wednesday, January 1, 2014 at 11:54pm

Chemistry
You need the equilibrium constant.
Wednesday, January 1, 2014 at 11:32pm

Chemistry
Equimolar amounts of gas A and B, each at an initial partial pressure of 1.00 atm are combined in a flask. The flask is sealed and allowed to react to completion according to the reaction: 2A(g)+ B(g) --> C(g) What is the final pressure inside the flask?
Wednesday, January 1, 2014 at 11:08pm

chemistry
The kinetic theory of gases is based on a number postulates from which the equation P= 1/3× N/V×m×µ² is derived (P is the pressure of the gas, N the number of molecules in the container, m the mass of each molecule and µ² is the mean ...
Wednesday, January 1, 2014 at 9:20pm

Really needs subject heading CHEMISTRY
Ok, I will guess but chemistry is not my field. I suppose that we are de- oxidizing this stuff and the difference in mass is O2. for each chemical equation: x is moles of O2 in one reaction and Y is in the other 2x KNO3---> 2x KNO2 + x O2 2y NaNO3 --->2y NaO2+ y O2 The ...
Wednesday, January 1, 2014 at 8:41pm

chemistry
Did you figure out how to answer this?
Tuesday, December 31, 2013 at 2:14pm

AP CHEMISTRY
It ain't 4
Monday, December 30, 2013 at 8:51pm

Chemistry
What is the effect of Independent Variable on Dependent Variable ?
Monday, December 30, 2013 at 6:01pm

Chemistry
What is the effect of Independent Variable on Dependent Variable ?
Monday, December 30, 2013 at 5:53pm

To Damon
In chemistry N stands for normality and in the case of NaOH the N and M have the same value.
Monday, December 30, 2013 at 12:29am

Chemistry
If I get time I will look at this, but really you need a chemistry teacher.
Sunday, December 29, 2013 at 2:33pm

label real subject please
Hey, If you label this as CHEMISTRY, you will get a chemistry teacher instead of a Physicist (me) or Mathematician (Steve). Yours truly Damon
Sunday, December 29, 2013 at 2:32pm

analytical chemistry
Regarding ICP analysis 4. For each of the following electrical discharge sources list the major strengths and limitations: a. dc arcs, b. ac arcs, c. ac sparks.
Friday, December 27, 2013 at 8:08am

chemistry
This may help but I don't think anyone at this site will do this for you. Most freshman texts have it. http://en.wikipedia.org/wiki/Kinetic_the​ory
Thursday, December 26, 2013 at 11:00am

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