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May 6, 2016

# Search: Chemistry [sumone help me please :(]

Number of results: 103,945

i am readin this book called "the wave" i am lookin for the answer n i cant find it...can sumone please help me...this is the question...explain the requirements for participating in "the wave" experiment and how they were monitored. evaluate if they were fair.
September 3, 2010 by cristal

can sumone unscramble this word .. conshourire
September 25, 2009 by Anonymous

Chemistry [sumone help me please :(]
0.250g of phthalic acid is dissolved in 40.00cm^3 of 0.100 mol dm^-3 NaOH. It requires 11.80 cubic centimeters of 0.100 mol\dm^-3 HCL fo neutralisation( to phenolphthalein) The mole ratio in which phthalic acid reacts with sodium hydroxide ihn 1:2 (a) Calculate the moles of ...
September 21, 2011 by Petty

Geography
Hi i need some help with my homework. Iv got 2 do a project on Snowdon (just Snowdon NOT Snowdonia) and i cant find a very good website :( Id really appreciate it if sumone could giv me a few good websites to look at :] xx
November 25, 2008 by Rhys Dickens

Motion
Can sumone explain wot linear motion is? Wot's the opposite of linear motion? THX Linear motion is motion is a constant direction, i.e., along a straight line. The speed may change but the direction may not. Motion that is not linear is called curvilinear.
June 25, 2005 by Mike

What is the pH of a 5.06E-2 M aqueous solution of sodium acetate? I know that I would set this up the same way I did for the previous question that I posted. I am just confused on how to find the Ka. I know it is kw/kb but for what compound is what I do not know. Chemistry(...
April 8, 2012 by Hannah

To all chemistry students
Please understand that one of our chemistry tutors is on vacation this week. Please be patient.
March 24, 2011 by Writeacher

how do i convert these problem. thank you _____fl oz=4 gal _____fl oz=3 pt 3 mi=____ ft CAN SUMONE PLEZ HELP BE4 MY BEDTIME!!! http://www.pioneerthinking.com/measure.html You can look them up in here. Find out how many ounces (oz) in a pint, quart, gallon. Do the math. There ...
February 1, 2007 by nitta

chemistry to MathMate
Chemistry - CJ, Tuesday, March 31, 2015 at 10:53pm I am experiencing a major block.... I can't say.... 1micrometer= 1000nm 5micrometer= x..... because I'll get back the same thing So please help me, tell me the answer please.
March 31, 2015 by CJ

Calculate the pH of an aqueous solution of 0.15 M potassium carbonate. I know that pH = -log(H30+) but I am not sure how to start this problem. Chemistry(Please help) - DrBob222, Saturday, April 14, 2012 at 11:09pm Hydrolyze the CO3^2-. CO3^- + HOH ==> HCO3^- + OH^- Do an ...
April 18, 2012 by Hannah

Chemistry 130
October 7, 2009 by Jessie

chemistry
hi Dr Bob..can you please help me with this chemistry problem? I got problem dealing with the chemical formula.How i want to find the number of moles of 2g of Fe(NH4)2(SO4)2.6H2O???please help me.Thank you
August 15, 2010 by tarra

Chemistry - HELP IGCSE
I have a chemistry exam tomorrow and I don't get the double bonding in covalent bonding I tried many websites , textbooks and other books and yet nothing worked Can someone please expain it clearely and in a simple way and please don't put any links for websites ca use ...
January 27, 2008 by AMY

help me out in choosing a topic for my project it should be anyhow related to chemistry help me please

1) The Ka for acetic acid is 1.8e-5. What is the pH of a 3.18M solution of this acid? I did 1.8e-5 = x^2/3.18 x=sqrt 1.8e-5 X 3.18 = 7.56e-3 pH=-log(7.56e-3) = 2.12 The pH is 2.12 2) At 25 degrees celsius, the pH of a 1.75M NaCN solution (the Ka for HCN is 4.0e-10) is ? 4.0e-...
April 2, 2012 by Hannah

organic chemistry
December 27, 2008 by lou

Chemistry
please help! Is RTP in chemistry (thermochemistry and electrochemistry) referring to room temperature of 25degreeC (or 298K) and 1atm, or 20degreeC (293K) and 1atm? In my lecture notes on gas law, they stated RTP refers to 25degreeC, but in my electrochem lecture notes they ...
November 6, 2011 by Hailey

chemistry/stiochiometry
could someone please answer my chemistry/stoichiometry questions below both "anonymous one just chemistry on todays date
March 16, 2011 by "anonymous"

CHEMISTRY!!!!! HELP!!
October 18, 2014 by Jane

CONVERT : 1.67KG =___MG 2.70MM=___KM 3.55 DAYS=___MINS 4.37 FAHRENHEIT=___KELVIN BETTER IF WITH SOLUTIONS PLEASE AND HOW TO DO PLEASE
June 25, 2013 by Dishea

Emergency chemistry
July 30, 2015 by Sarah foster

Calculate the pH of an aqueous solution of 0.15 M potassium carbonate. I know that pH = -log(H30+) but I am not sure how to start this problem. Chemistry(Please help) - DrBob222, Saturday, April 14, 2012 at 11:09pm Hydrolyze the CO3^2-. CO3^- + HOH ==> HCO3^- + OH^- Do an ...
April 17, 2012 by Hannah

Organic chemistry
please help me with these what are the functional group(s) in Lexiva (Fosamprenavir Calcium)? i only know that it has an amine group but i'm not sure if there is another group!!! and how can i relate Lexiva to chemistry?(ideas please)
December 4, 2012 by leena

Chemistry
Hi, I am totally confused with this chemistry because none of this stuff is in my book, so I come to the great ones with my question: 1. Can you show me how to convert celsius to farenheit (please show me an example and your work so I can get it please) 2. farenheit to kelvin...
September 24, 2006 by Confused considerable

Chemistry (pleas help!)
a stressed chemistry student is hyperventilating into a paper bag. The student stops to wip his brow after a few breaths, and the bag is at 5.7 KPa and the temperature in the lecture hall is 24 degrees C. The bag is 0.75 L full. The student then goes at it again, and ...
March 24, 2011 by Celine

I have to calculate the concentration of I2 produced (# of moles of I2 produced / L) based on the stoichiometric ratio in the following equation. 2S2O3^2- + I2 -> 2I^- + S4O6^2- Chemistry(Urgent, please help) - DrBob222, Sunday, February 26, 2012 at 9:47pm If you know the ...
February 27, 2012 by Hannah

Chemistry
Please help me with this chemistry question? I am working on a lab report and I am stuck on this question: Use the concept of stoichiometry to explain why balanaced equations are necessary when performing calculations in chemistry. Propose a situation where precise amounts of ...
September 8, 2009 by Jessie

Chemistry
Balance the equation: NO2- (aq) + Al (s) --> NH3 (g) + AlO2- (aq) (basic solution) ** please note the "2-" on the NO2- and AlO2- are not subscripts, they are the charges. I missed a few classes in Chemistry and find myself lost. I have tried to learn these equations with ...
October 30, 2015 by Nikki

chemistry!
i lost my notes for Stoichiometry and have a final tomorrow. ASAP would be appreciated. im trying to find a site that can help me with balancing word equations calculations:mol,g,liters-gas and determining limiting reagent and % yields. please please please help me.
June 9, 2009 by chris

chemistry
can you please give me one practical application of analytical chemistry in being a medical technologist? i know it will determine the separation event happening on the lab test... but is that already a practical application? or i have to cite a deeper example? please give me ...
November 27, 2014 by Shi

Chemistry
Why was Wohler's synthesis of urea significant to the field of carbon chemistry? Please help. Thank you.
January 24, 2011 by John

chemistry
September 9, 2014 by lola

May 5, 2008 by Chelsea

Chemistry
October 29, 2008 by Marie

DrBob222
April 5, 2010 by Help please

What is the oxidation number of sulfur (s) in NaHSO3? I know that Na is 1 but I do not know what else to do. Please explain, thank you for your help!!
September 26, 2011 by Hannah

Chemistry
January 8, 2013 by Bobert Wells

Which of the following is the strongest reducing agent? a) Li+ b) Zn c) Sn d) H2 Is it Li? Can someone please explain what the answer is and why?
May 9, 2013 by scilover

AP CHEMISTRY
March 19, 2012 by HELP PLEASE

Science (Chemistry)
I'm not sure how to do a couple of problems on my chemistry worksheet. Can you please help me? You dissolve 0.00902 g of naOH in enough water to make 1000 mL. What is the Ph of this soultion. What is the molarity, pH, and pOH of 5.00 of naOH in 750.0 mL of soultion. I know how...
November 6, 2011 by Dylan

chemistry
June 27, 2012 by abby

October 7, 2013 by Russel

What are the Ka and/or Kb value for 1M ZnCl2 Show work please!!!
April 11, 2014 by Eric

AP CHEMISTRY
May 1, 2012 by DAN

Chemistry
I am working on a solid chemistry problem, but I do understand what e^ means. Is it the elementary charge? or Faraday constant. Please help.
November 16, 2013 by FHD

Chemistry
Please,tell me the ways I can use to understand chemistry better.I need help,and it is urgent because am starting to drop.
February 17, 2016 by Miracle

Chemistry
February 19, 2010 by Ashley

chemistry
calculate the pressure,in atmospheres, of 2.00 mol helium gas in a 10.0-L container at 27 celcius? Please i don't understand any of this? help please?
October 16, 2010 by Shayla

how would you separate Fe3+ from Ba2+ in a mixture? Please explain and give an equation for reaction.
October 30, 2010 by Rocio

i need some help understanding this problem please. How many moles of O are there in 32.4g N2O5, how many oxygen and nitrogen atoms are there in the 32.4g?
March 31, 2012 by Mary

chemistry
How do you make a venn diagram of the 6 branches of chemistry? (Inorganic chemistry, organic chemistry, biochemistry, nuclear chemistry, physical chemistry, and analytical chemistry) like where would they go in the 3 circles
August 26, 2012 by jake

Chemistry
For my Chemistry question it's about herbicide's What do they do? what are they intended for? what risk's do they pose in our society? how are they created? if anyone could answer these please thanks you!
January 19, 2012 by Steven Andersen

Chemistry
Please please help me on this equation I'm stuck and your steps are confusing. Calculate the concentrations of each ion remaining in solution after precipitation is complete. (Enter a 0 if none of the ion remains.) Cl ‾ Ca2+ I have Ag+=0 and NO3^-3= 0.13 but I can't seem...
June 21, 2013 by Ashley

Chemistry
How do the qualities of acids and bases help us in the natural world? Please help-I posted this yesterday and I really don't get it-can someone direct me,please? Thank you
April 27, 2010 by Sara

i do not understand how to solve this problem, please help 10.0mL 0.5M sulfuric acid can neutralize what volume of 0.5M ammonium hydroxide?
March 31, 2012 by Robert

Chemistry
Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Thank you
May 31, 2010 by Aubrey

Chemistry
Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Thank you
June 1, 2010 by Aubrey

chemistry
Could someone please tell me how to solve this problem: A pressure of 25.7 inHg would be how many kilopascals? Could you please list the steps on solving it. Thanks
November 24, 2011 by Sandy

CHemistry
For the reaction 2 Na + 2 H2O -------> 2 NaOH + H2, how many grams of hydrogen gas are produced when 133.6 g of water are reacted? I am soooo confused in chemistry. Please help.
May 17, 2014 by Kalli Simpson

science
June 1, 2015 by lizzy

Chemistry
October 22, 2010 by mysterychicken

Chemistry
Can someone please help me on this two Chemistry questions...they are from my lab....the lab was on Acids and Bases using Red Cabbage Indicator. Q1- How consistent was the cabbage juice indicator for this lab? Discuss the limitations of using red cabbage juice as an indicator ...
October 12, 2009 by Jessie

DrBob222 help me!!
May 23, 2007 by Fabiola

If 15ml of 1M sulfuric acid is used until faint pink endpoint is reached how many moles of magnesium hydroxide are in 50ml solution. Please help
April 25, 2014 by Cassy

delta Go = -431.16kJ/mol - (298k X 0.12529 kJ/K*mol) I am having trouble converting the units for delta H and delta s to match. I multiplied delta H by 1000 to get kJ but this didnt give me the correct answer. Chemistry(Please help) - Dev, Wednesday, April 25, 2012 at 6:56pm ...
April 28, 2012 by Hannah

Chemistry
Could someone please direct me to a website that explains why acid-base titration is a useful technique in chemistry. Or offer your own opinions. Thanks ahead of time for any input!
March 4, 2009 by Jake

Chemistry
Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Any help would be greatly appreciated-I'm desperate Thank you
June 2, 2010 by Aubrey

write the oxidation and reduction half-reactions that occur at the anode and cathode, respectively, when MgCl2 liquid is electrolyzed using inert electrodes. HELP PLEASE!!!
March 20, 2014 by devon

chemistry
Please help me with my formal report on "Potentiometric Determination of the Purity and Dissociation Constant of Potassium Hydrogen Phthalate" Please give me links to websites that could be used for my reference... In addition, please do suggest books that discuss ...
August 19, 2007 by Smiley

physics
When a ball falls down from a height h, its P.E is transformed into K.E as it's free-falling, BUT..... wot abt objects not falling freely? So... What happens to the potential energy of an aeroplane when it lands, does it change to K.E (well it already has tht, doesn't it?) + ...
June 29, 2005 by Mike

Chemistry
Can Someone describe the structure of ionic compounds for me please.. Ionic compounds consist of a three dimensional array network of + and - ions. I expect you already know that. As to structure, here is a web site that may help. Repost if you have additional questions but ...
November 15, 2006 by bryan

molecular orbital theory? my teacher was like "im not teaching it, but its going to be on your test" can you please summarize what it is, i read the online sites,tehy dont make sense...
November 4, 2008 by Sam

Chemistry
Can you please someone check my answer for me? I don't know how to start thses answer. Chemistry is not my things. Please give me answers. :( a)Determine the number of grams in 0.750 moles of the compound Iron(II)phosphate: Fe3(PO4)2. Answer: ? b)How many atoms of iron are in ...
March 31, 2010 by Anonymous

Last chemistry post
Can someone please reply to my previous post about chemistry preferable DrBob since he was helping me on it, but anyone is fine.
January 29, 2009 by Chopsticks

Chemistry(Mastering Chemistry HELP )
Convert 2.868*10^10g to kg, Mg, and mg For kg, I put .002868 and 2.868*10^-3 but the computer said neither are correct. HELP PLEASE! (:
September 11, 2012 by claire

Chemistry
How to do significant values in Chemistry? I am totally stuck; I have no idea what to do? My teacher gave me C due to the significant value error. Please help
September 26, 2012 by Chris

chemistry
what is the molality of a 10.5% by mass glucose solution?. density of the solution is 1.03g/ml can someone please explain how to do this question. please and thank you
February 10, 2011 by sam

If the time elapsed is 4.26 min, what is the value of the rate constant, k? ln[R]t / [R]o = -0.0237 I am not sure how to slove this. Is Rt 4.26 min
March 7, 2012 by Hannah

1) Describe 4 processes/forces that can explain all mechanism in Organic Chemistry? My answers: a) Electron Delocalization b) Hydrogen Bonding c) Aromacity d) Nucleophilic Substitution (SN1 & SN2) Thank you!
May 4, 2015 by Need Help Urgent

Chemistry - Forensics
Discuss the chemistry of chemical reagents in forensics. Please be as specific and clear as possible. Thank you!
January 6, 2011 by Tilly

pf
December 6, 2006 by kahyla

Chemistry
Can someone please help with this problem and explain it please? If soil has a density of 1.32 g/cm cubed, then what does 1.0 cubic yards of soil weigh in pounds?
January 21, 2013 by Sally

September 27, 2011 by Anonymous

Chemistry
please I need help with this. what is the difference between molality, normality and molarity? and adhesive forces and cohesive forces? I am very confused. please help thanks
October 26, 2008 by Maria

Using standard thermodynamic data from Appendix L of your text, calculate the equilibrium constant at 298 K for the following chemical reaction: CO(g) + H2O(l) CO2(g) + H2(g). Show work please! Thank you!!!
March 16, 2014 by Layla

What is the [H3O+] for a neutral solution at 50 degrees celsius? I know that kw=[H3O+][OH-] but I am not sure what to do to get the H3O. The value I have for kw=5.76e-14 and I have the pH 6.62 but I do not know what the OH would be. Chemistry(Please help, thank you) - DrBob222...
April 1, 2012 by Hannah

A compound contains 38.7% K, 13.9% N, and 47.4% O by mass. What is the empirical formula of the compound?
January 24, 2013 by Vic

If you add 23.5g of NaCl to 1.2 kg of water, what will be the boiling point and the freezing point of the new solution? (Kf=1.86, Kb=0.52) (Please show work, I appreciate everything)
November 10, 2010 by Jasmin

When one student did this experiment, he started with 19.5 mL of 0.118 M monoprotic acid. The endpoint was reached when 17 mL of base was added. What was the concentration of the base?
July 9, 2012 by Sabrina

What effect would a sweaty person have on the pool chemistry? Would the reaction tend to be forced to the right or to the left? Any help is greatly appreciated!
October 21, 2012 by Corneil

Chemistry
At 1 atm, how much energy is required to heat 67.0 g of H2O(s) at –14.0 °C to H2O(g) at 115.0 °C? Please explain, I'm not very good at Chemistry and this problem is giving me a headache. Thank you!
February 2, 2013 by Anonymous

Chemistry
what number should be placed in the blank to balance the equation C 3 H 8 + 50 2 --> 3 CO 2 ___ H 2 O I have been working on this Q for four hours and it is driving me CRAZY please HELP i hate chemistry or anything with numbers in it as a matter of fact.
January 12, 2011 by Brooke

Chemistry
Can you determine the mass of carbon monxide that is produced when 45.6 grams of methane reacts with 73.2 grams of oxygen gas. Can you please show work in detail please. Thanks
March 25, 2010 by Stacey

Chemistry
determine the mass of carbon monxide that is produced when 45.6 grams of methane reacts with 73.2 grams of oxygen gas. Can you please show work in detail please. Thanks
March 25, 2010 by Stacey

The question is: the arsenate ion has the formula AsO4^3-. Write the formula of the corresponding acid that contains this anion. I don't really understand what I need to do. please help!
November 5, 2012 by Thy

Chemistry
what volume of 0.120 M NaOH must be added to 100 ml of 0.100 M NaHC2O4 to reach ph of 4.70? The answer is 60 ml but I dont know how to find it. Can you please show me the steps and how to do it please
February 18, 2016 by Steve

Determine whether the solution is basic, acidic, or neutral. Write net ionic equations to show how it behaves in aqueous solutions. 1) Fe2(SO4)3 I know it is acidic Do I do hydrolysis equations for the net ionic or do I do redox reactions?
November 5, 2015 by Anonymous

Chemistry-Dr. Bob
Please help me in any way to relate the concepts of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. I appreciate any direction or info you could provide, Dr. Bob Thank you
June 2, 2010 by Christine

Chemistry
Can someone please tell me what to expect from Beginner High School chemistry? Is it mostly applying mathematics like physics? Or basically memorizing like biology? Thank you!
January 17, 2015 by Lucina

Chemistry
Please help me verify the following question: Consider the following ion; XF2-2 What is the oxidation number assigned to element “X”? Show your work My answer: X F2-2 X -1(-1) X -3=0 X = +3 Please let me know if right. Many thanks!
June 14, 2011 by Dexter

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