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September 23, 2014

Search: chemistry help please!!!!

Number of results: 88,292

Chemistry(Please help)
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

Chemistry(Please respond)
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
Can someone please help me with this question? Could freezing point depression be used for substances that are not soluble in water? Please help me....can you explain why? Is there anywhere I can find this information because my chemistry book doesn't have any info. about this...
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 project please help really need it
help me out in choosing a topic for my project it should be anyhow related to chemistry help me please
May 23, 2013 by aditi

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

Chemistry(Please check)
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
Which has a higher Rf value Ibuprofen or mefenamic acid? please please please.i need your answers.
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(URGENT PLEASe)
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

Chemistry(Please help)
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

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

chemistry
Please can i have a list of adaptive features of terrestrial plants. Please
September 9, 2014 by lola

AP CHEMISTRY
Someone please answer my question below in AP CHEMISTRY.
March 19, 2012 by HELP PLEASE

Please help with Chemistry due today
please help with the questions that I have submitted.
May 5, 2008 by Chelsea

Chemistry
Could someone please explain the concept of electromagnetic radiation to me please? Thank you!
October 29, 2008 by Marie

DrBob222
I really need help on these chemistry problems. Can you please help me work them. Please?
April 5, 2010 by Help please

Chemistry(Please help, thank you!!)
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
PLEASE PLEASE HELP How do i find the Empirical formula of CuCl2.5H2O
January 8, 2013 by Bobert Wells

Chemistry Help Please
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

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

AP CHEMISTRY
Could someone please tell me where to find the 2008 AP Chemistry Multiple Choice for FREE ONLINE? Thank You in advance!
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
calculate the volume occupied by 10^22 molecules of a gas 300 k and 760 mm pressure. please help me please...................
June 27, 2012 by abby

Please Help
Can someone please help with the chemistry problems? I need them to study.
October 7, 2013 by Russel

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

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
Dear DrBob222 !!! Would you please help me answers the question that I posted. I really don't understand and need help! Please, Thanks
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

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

Chemistry help please
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
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

Chemistry Help Please
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

Chemistry
I..don't understand any of this: 43. How many moles are in 25.0 grams of potassium? Show your work and round your answer to the appropriate number of significant figures. Please, please help with this! Thanks -MC
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!!
Please I posted a chemistry question but I havent gotten any answer back please help me, sorry for having so little patience answered below.
May 23, 2007 by Fabiola

Chemistry. Please
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

Chemistry(Please help)
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

Social Studies
Please Help I know but please I'm the parent and my son tell me to check and i don't know 2 much please in your own words please :( :( :( :( please pretty please please please !!!! :( don't give give me links please in your own words please please :( !!!!! Identify two ...
April 6, 2013 by Alejandra

Chemistry HELP PLEASE!!
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

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

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

Chemistry- DRBOB!! PLEASE?
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

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

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

Chemistry(Please, please help)
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

pf
i need help with pf. Please specify what your exact question is and please label your question as to the subject, example, English, algebra, chemistry, etc. We will be happy to help you.
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

chemistry NEED SERIUOS HELP PLEASE!!!!
a)issues of biodegradibility of plastic b)methods of waste disposal and the issues PLEASE HELP THANK YOU
September 27, 2011 by Anonymous

Chemistry(Please respond, thank you)
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

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

Chemistry Help Please
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

Chemistry- Someone please help ASAP- PLEASE
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

Chemistry Help Please!!
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..please help..thanks
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

chemistry please help me please!!!
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

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-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 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

Chemistry-Please help
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
can someone explain the leveling effect in chemistry or provide a good link please? in my chem book it says something like HNO3<H2SO4<HCl<HBr<HI<HClO4 but i dont get why they are greater/smaller
August 5, 2011 by Henry

chemistry
What is the hydrogen ion concentration, in mol dm−3, when 2.00 g of sulfuric acid is dissolved in water to give 0.400 dm3 of solution? could you explain in a simple and clear way please because im not very good at chemistry. thanks in advance
May 19, 2013 by becky

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

Chemistry.
Caculate the wavelength of light emitted when each of the following transitions occur in the hydrogen atom. A.) n=3->n=2 B.) n=4->n=3 C.) n=2->n=1 How do you do this. Could you please just show me step by step for atleaset one. Please!
January 24, 2013 by Brenda

chemistry
what is suspension in chemistry? will you please give me a very long explanation about it now.....? I really need it for my project.plz?????? Write your own long explaination, and I will be happy to critique it.
October 9, 2006 by Lawrifel

Chemistry
If you add 0.35grams NaF to 150mL of a 0.30M HF, what is the pH of the resulting solution? To start off would I use the value of 1.4e-11 for F^-^ and 7.2e-4 for HF? Chemistry(Please help) - DrBob222, Tuesday, April 10, 2012 at 12:04am This is a buffer problem. pH = pKa + log(...
April 10, 2012 by Hannah

Chemistry PLEASE HELP!
A compound is known to contain only C, H, and N. On combustion of a sample of 12.5 mg, 22.3 mg of CO2 and 15.2 mg of H2O were produced. Use this data to find the empirical formula for the compound. (Please show working out)
June 12, 2012 by Kevin

Chemistry
can someone balance this redox please. frustrating because i dont know what else im doing wrong. C2O4^2- + MnO2 --> Mn^2+ + CO2 my answer is 2C2O4^2- + MnO2 + 4H3O^+ --> Mn^2+ + 4CO2 + 6H2O im getting mad please help thanks.
August 21, 2013 by justin

Chemistry: Conversion
What's the formula to convert 7 square yards to square meters. May you please show me a website to help with converting or anything? I keep forgetting, and I'm kind of a slow scholar, so please bear with me...
July 2, 2014 by Losa

Chemistry
I need to calculate the molecular mass of ehtylene glycol based on the freezing point depression. The teacher said that for glycol i=1 and to use the equation m=delta T / Kf X i Kf = -1.86C/m so I did -2.5C / -1.86 X 1 = 1.344 I know that 1.344 can't be the weight for glycol ...
February 21, 2012 by Hannah

Chemistry, please help!!!
I have to go to work this weekend so I'm trying to get my homework finished. Could you please help me figure out this question? Calculate the mass of 1.00 mol of each of these substances: a.) silicon dioxide (SiO2) b.) diatomic nitrogen (N2) c.) iron (|||) hydroxide (Fe(OH)3) ...
March 14, 2014 by Kelsi

AP Chemistry
I have no idea how to answer this question: A compound effuses through a porous cylinder 3.20 time faster than helium. What is its molar mass? Help me please? Give a step by step detail please.
February 10, 2011 by Ana

Chemistry Please HELP!
calculate the mass of each product formed if 10.0 g of the first reactant is reacted with 10.0 g of the second reactant: NCl3 + 3 H2O → 3 HClO + NH3 (Please show me full working out)
June 11, 2012 by Kevin

Chemistry - help please
The decomposition of NH4Cl can be accomplished by heating it in an evacuated cylinder. The products are NH3 and HCl gas. If the total pressure after heating is 4.4 atm, determine Kp. Please help me with the steps on how to do solve this.
October 14, 2013 by Eren

chemistry+reply
can someone reply to my previous chemistry thread please?
January 21, 2009 by Chopsticks

chemistry help
this isnt exactly a chemistry question, but i am doing chemistry homework with my calculator. and i want to know if someone can tell me how can i cube something with this calculator? TI-30X IIS? i wanted to post a pic but i cant post sites. i have this calculator can you tell ...
November 28, 2010 by jessie

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: 129.68grams 357.477722g/mol is ...
April 1, 2010 by Anonymous

help with chemistry please
Can someone please explain how to do this An equilibrium mixture at 225∘C contains 8.010−2M NH3 and 0.20M H2 for the reaction 3H2(g)+N2(g)←→2NH3(g) If the Kc at this temperature is 1.7102, what is the equilibrium concentration of N2?
July 29, 2013 by Anonymous

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