Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

analytical chemistry
a 0.120 ml portion of a 50.0% (w/w) KOH solution having a density of 1.50*10^3 g/l is diluted to 250 ml. What is the pH of the resulting solution?
Saturday, March 30, 2013 at 10:50pm

Chemistry
Calculate the mass of water that will be produced when 5.0 grams of H2 is reacted with excess O2.
Saturday, March 30, 2013 at 10:42pm

Chemistry
Calculate the mass of water that will be produced when 5.0 grams of H2 is reacted with excess O2.
Saturday, March 30, 2013 at 10:41pm

Chemistry
What are ways in which pka values for weak acids can be experimentally determined?
Saturday, March 30, 2013 at 10:19pm

Chemistry
What are some equilibrium expressions that chemists use for weak acid equilibrium?
Saturday, March 30, 2013 at 10:02pm

Chemistry
What are some equilibrium expressions that chemists use for weak acid equilibrium?
Saturday, March 30, 2013 at 10:01pm

CHEMISTRY HELP PLEASE!!!
The cell potential of the following electrochemical cell depends on the pH of the solution in the anode half-cell: Pt(s)|H2(g,1atm)|H+(aq,?M)||Cu^2+(aq,1.0M)|Cu(s) what is the pH of the solution if Ecell is 375 mV? I first got .65 as my pH, but it said that it was wrong...
Saturday, March 30, 2013 at 9:33pm

Chemistry
Calculate the molar mass of a diprotic acid. It reaches the endpoint of the titration with NaOH at 28ml. The initial concentration of NaOH is 0.09792. and the initial mass of the diprotic acid is 0.685g. I keep getting a molar mass of 500g/mol. but the options are all around ...
Saturday, March 30, 2013 at 8:50pm

Chemistry
10.0 mL of a 0.300M NH3 solution is titrated with a 0.100M HCl solution. Calculate the pH after the following additions of HCl. 0.00mL 10.00mL 30.00mL 40.00mL
Saturday, March 30, 2013 at 7:35pm

chemistry
What is the molar concentration of sodium ions in a 0.450 M Na3PO4 solution?
Saturday, March 30, 2013 at 6:31pm

Analytical Chemistry
Current is applied to an aqueous solution of calcium sulfide. Multiple choice help please??! What is produced at the cathode? A) H2(g) B) S(s) C) O2(g) D) Ca(s) What is produced at the anode? A) O2(g) B) H2(g) C) Ca(s) D) S(s)
Saturday, March 30, 2013 at 4:53pm

Chemistry
Need help with this question. Any help is appreciated. Heptane, C7H16, and octane, C8H18, form ideal solution. The solution boils at 85.00 ºC and 0.522 atm. (At 85.00 ºC, the vapor pressure of pure heptane is 0.570 atm and the vapor pressure of pure octane is 0.234 ...
Saturday, March 30, 2013 at 4:25pm

Chemistry
Solve an equilibrium problem (using an ICE table) to calculate the of each of the following solutions. .16M CH3NH3Cl
Saturday, March 30, 2013 at 4:14pm

chemistry
LP gas burns according to the exothermic reaction: C3H8(g) + 5 O2(g) right arrow 3 CO2(g) + 4 H2O(g) ΔHrxn° = −2044 kJ What mass of LP gas is necessary to heat 1.2 L of water from room temperature (25.0°C) to boiling (100.0°C)? Assume that during ...
Saturday, March 30, 2013 at 4:05pm

Chemistry
Find the Qsp when 9 drops of 0.014 M Na2CO3(aq) are added to 25 mL of 0.003 M AgNO3(aq). The solubility product of Ag2CO3 is 6.2 × 10−12. Assume 20 drops per milliliter.
Saturday, March 30, 2013 at 2:47pm

chemistry
why is the head temperature kept below 90 c in the initial step of the dehydration reaction?
Saturday, March 30, 2013 at 12:12am

Chemistry
Calculate the cell potential for the following reaction as written at 59 ¡ãC, given that [Cr2+] = 0.763 M and [Sn2+] = 0.0170 M. Standard reduction potentials: Sn2+(aq) + 2e¨C ¡ú Sn(s) E=¨C0.14 Cr2+(aq) + 2e¨C ¡ú Cr(s) E=¨...
Friday, March 29, 2013 at 10:52pm

Chemistry
Which of the following reagents would oxidize Cr to Cr2 , but not Fe to Fe3 ? Ca Co Ca2+ Br2 Co2+ Br- Which of the following reagents would oxidize Cu to Cu2 , but not Cl– to Cl2? Br2 Ca Co2+ Co Br- Ca2+
Friday, March 29, 2013 at 10:49pm

Chemistry
A current of 5.61 A is pass through a Ni(NO3)2 solution. How long (in hours) would this current have to be applied to plate out 9.00 g of nickel?
Friday, March 29, 2013 at 10:33pm

Chemistry
A current of 4.60 A is passed through a Pb(NO3)2 solution for 1.20 hours. How much lead is plated out of the solution?
Friday, March 29, 2013 at 10:32pm

chemistry
lowest+freezing+point+of+Kbr+AlNO33+CH3COONa+NaNO2+MgCl2+of+same+molality
Friday, March 29, 2013 at 9:39pm

chemistry
A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m? Show all of the work needed to solve this problem.
Friday, March 29, 2013 at 7:27pm

CHEMISTRy
predict the product of the following: a.) Ca + H + OH => b.) Pb(NO3)2 + Cu =>
Friday, March 29, 2013 at 6:39pm

Chemistry 151
A minimum energy of 225 kJ/mol is required to break a certain chemical bond in a compound. What is the longest wavelength of radiation (in nm and angstroms, Å; 1 Å = 10−10 m) necessary to break the bond? In which region of the electromagnetic spectrum does ...
Friday, March 29, 2013 at 4:38pm

Chemistry
Rank the following molecules in order of increasing boiling point. NH3, CaCl2, Ar, CO, HF This is what I have, am I correct or on the right track? CaCl2, HF, NH3, CO, Ar
Friday, March 29, 2013 at 2:51pm

Chemistry
When 50.0ml of 1.00M HCl is titrated with 1.00M NaOH, the pH increases. calculate the difference in pH of the system when you add 49.99ml NaOH and 50.01ml of NaOH. Please work out detailed steps.
Friday, March 29, 2013 at 2:47pm

Chemistry
You have two buffer solutions 1) weak acid and its conjugate base 2)weak base and its conjugate acid. Write explicitly ( considering generic formula for acid and base) the equations of neutralization when you: a) add strong acid and strong base 1) b) add strong acid or strong ...
Friday, March 29, 2013 at 2:45pm

Chemistry
You are given an assignment to make 250ml buffer solution having 0.25M weak acid and 0.2M of its conjugate base. You have stock solutions 1.5M acid and 0.5M of the conjugate base. Clearly explain how you are going to make this buffer solution. Can anyone please help me!!!
Friday, March 29, 2013 at 2:42pm

Chemistry
How many grams of chlorine are required to react completely with 5.00 grams of sodium to produce sodium chloride ? 2na + cl2 → 2nacl
Friday, March 29, 2013 at 12:55pm

chemistry
What will be the fastest reaction if a strong base, such as sodamide, reacts with a secondary alcohol, such as (2S)-butanol? a) deprotonation of the alcohol b) substitution with racemization of stereochemistry c) elimination to form the more substituted alkene d) substitution ...
Friday, March 29, 2013 at 12:10pm

Chemistry
Determine the volume of methane CH4 gas needed to react completely with 0.660 L of 02 to form methanol CH3OH I'm confused because I'm sure CH4 + O2 don't give you CH3OH. Thanks
Friday, March 29, 2013 at 11:58am

Chemistry
150cm3 of KOH solution containing 5.6g of KOH per dm3 of solution.what is the concentration?
Friday, March 29, 2013 at 10:33am

Chemistry
What are the reducing agent and the oxidising agents in the synthesis of ammonia from hydrogen and nitrogen?
Friday, March 29, 2013 at 9:23am

chemistry
the Ksp of CaSO4 is
Friday, March 29, 2013 at 2:37am

AP CHEMISTRY
The molar mass of an unknows organic liquid (M~100) is determined by placing 5 mL of the liquid in a weighed 125-mL conical flask fitted with a piece of Al foil with a pin hole in it. The flask is heated in a boiling water bath until the liquid evaporates to expel the air and ...
Friday, March 29, 2013 at 1:34am

AP CHEMISTRY
A dilute solution of which acid is most likely to produce a reduction product other than H2 when it reacts with a metal? A)HF B)HCL C)HNO3 D)H2SO4 Answer is C. I know it has something to do with it producing oxygen, but I really don't understand where that comes from. ...
Friday, March 29, 2013 at 1:28am

AP CHEMISTRY
Determine the volume of 0.125 M NaOH required to titrate to the equivalence point 25.0 mL of a 0.175 M solution of a monoprotic weak acid that is 20% ionized. Answer is 35.0 mL. How do you find it?! It's been a really long time since we talked about titrations. Please help (:
Friday, March 29, 2013 at 1:20am

Chemistry
How many kilocalories does a runner expend when he runs for 4.5 h and uses 710 Cal/h? How many pieces of pizza that each contain 12 g of protein, 11 g of fat, and 30 g of carbohydrates could be eaten after the race to replenish these calories?
Friday, March 29, 2013 at 1:14am

AP CHEMISTRY
C(s) + H2O(g) ⇌ CO(g) + H2 ΔH>0 For the system above at equilibrium, which changes will increase the amount of H2(g)? I. Adding C(s) II. Increasing the volume of the container III. Increasing the temperature The answer is II and III. I understand everything ...
Friday, March 29, 2013 at 12:57am

Chemistry
I was just wondering how I would determine the pKb of a weak base that was titrated with a strong acid on a titration curve at the EQUIVALENCE POINT. And from this, how would I find the pH? PLEASE HELP!!
Thursday, March 28, 2013 at 8:56pm

chemistry
What mass of KNO3 (MW=101) is needed to prepare 45omL of 0.250 M KNO3 in water?
Thursday, March 28, 2013 at 7:23pm

chemistry
What is the molarity (moles per liter) of an aqueous solution that is prepared by dissolving 5.58g NaOH (MW=40) in enough water to make 250mL of solution?
Thursday, March 28, 2013 at 7:16pm

chemistry
The triprotic acid H3A has ionization constants of Ka1 = 9.9× 10–2, Ka2 = 2.7× 10–8, and Ka3 = 5.9× 10–11. a). Calculate the following values for a 0.0570 M solution of NaH2A H+ ?? [H2A^-/H3A]?? b). Calculate the following values for a 0.0570 M...
Thursday, March 28, 2013 at 6:57pm

chemistry
Phosphoric acid is a triprotic acid with the following pKa values: pKa1=2.148 pKa2=7.198 pKa3=12.375 You wish to prepare 1.000 L of a 0.0200 M phosphate buffer at pH 7.11. To do this, you choose to use mix the two salt forms involved in the second ionization, NaH2PO4 and ...
Thursday, March 28, 2013 at 6:05pm

Chemistry
1. Which of the following metals is oxidized by calcium ions? *potassium zinc iron lead 2. The first electrochemical cell was invented by ____. Michael Faraday *Alessandro Volta James Maxwell Benjamin Franklin 3. Why can't a lead storage battery be recharged indefinitely...
Thursday, March 28, 2013 at 12:28pm

Chemistry
How do you distinguish between fluorene and acetanilide? Suggest methods other than melting point and chromatography.
Thursday, March 28, 2013 at 11:48am

Chemistry
Titration of 0.6500g of an acid requires 182.42 mL of 6.020x10^-3 N NaOH to reach the endpoint. What is the mass of an equivalent of this acid?
Thursday, March 28, 2013 at 11:38am

Statisitics
In a large section of a Chemistry class, the points for the final exam are normally distributed, with a mean of 72, and a variance of 81. Grades are to be assigned according to the following rule: the top 10% receive As, the next 20% receive Bs, the middle 40% receive Cs, the ...
Thursday, March 28, 2013 at 10:28am

chemistry
A certain weak base has a Kb of 8.40 × 10-7. What concentration of this base will produce a pH of 10.34?
Thursday, March 28, 2013 at 10:20am

chemistry
Pure water has a density of 1.00 g/ml at 297 . Calculate the molar concentration of pure water at this temperature. Would i just convert grams to moles, and ml to liters?
Thursday, March 28, 2013 at 9:15am

chemistry
How many milliliters of 0.602M hydrochloric acid (HCl(aq)) must be added to 15.00mL of 0.538M sodium hydroxide (NaOH(aq)) to reach the equivalence point? Report your answer to 2 decimal places.
Thursday, March 28, 2013 at 2:24am

Chemistry
How many mL of 12M HCl is needed to create 350mL of 0.125M HCl?
Thursday, March 28, 2013 at 1:20am

Chemistry
Determine the percent Composition of each element in phenyl sulfide: (C6H5)2S. Please show work in order to walk me through this.
Wednesday, March 27, 2013 at 11:16pm

Chemistry
If Gold sells for $1200.00 an ounce, how many atoms of gold can you buy for a penny? Please, Show work.
Wednesday, March 27, 2013 at 11:14pm

Chemistry
A cat is about 10.0% Carbon. My cat weighs about two kilograms. How many moles of Carbon are in my cat?
Wednesday, March 27, 2013 at 11:12pm

Chemistry
How many mL of .715 M HCI is required to neutralize 1.25grams of sodium carbonate? (Producing carbonic acid)
Wednesday, March 27, 2013 at 11:12pm

Chemistry
A swimming pool, 20.0 m 12.5 m, is filled with water to a depth of 3.73 m. If the initial temperature of the water is 18.5°C, how much heat must be added to the water to raise its temperature to 28.5°C? Assume that the density of water is 1.000 g/mL.
Wednesday, March 27, 2013 at 10:12pm

Chemistry
If you dilute 12.5 mL of a 3.5 M solution to make 213.8 mL of solution, what is the molarity of the dilute solution?
Wednesday, March 27, 2013 at 10:04pm

chemistry
H2 + CO2 <--> H2O + CO if there were something that were added to this system to absorb the CO2, where would the equilibrium shift? Please don't just give the answer, explain as well, thanks :)
Wednesday, March 27, 2013 at 9:59pm

chemistry
Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation: CO2(g)<==> CO2 (aq) K=0.032 The acid dissociation constants listed in most standard reference texts for carbonic acid actually ...
Wednesday, March 27, 2013 at 9:46pm

ap chemistry
WHERE CAN I TAKE AP CHEMISTRY ONLINE DIAGNOSTIC TEST?
Wednesday, March 27, 2013 at 8:50pm

Chemistry
You prepare a solution from 10.0 mL of 0.100 M MOPS buffer (3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.071 M NaOH. Next, you add 1.00 mL of 1.89 × 10-5 M lidocaine to this mixture Denoting lidocaine as L, calculate the fraction of lidocaine present in the form...
Wednesday, March 27, 2013 at 8:44pm

Chemistry
What is the molecular equation for HCl(aq) + NH4OH(aq)?
Wednesday, March 27, 2013 at 8:41pm

Chemistry
a chemist carries out the reaction of 0.250 mol of f2 with excess of cl2. At 250 degress C and 1.00 atm, what is the maximum volume of CLF3 in liters that the reaction can produce?
Wednesday, March 27, 2013 at 7:43pm

Chemistry
How many milliliters of 0.291 M HCl would be required to titrate 6.83 g KOH?
Wednesday, March 27, 2013 at 5:26pm

chemistry
If material is lost from the crucible by spattering, what effect would this have on the mass of Sodium Chloride?decrease or increase
Wednesday, March 27, 2013 at 3:48pm

Chemistry eq
How many milliliters of 0.430M hydrochloric acid (HCl(aq)) must be added to 15.00mL of 0.682M sodium hydroxide (NaOH(aq)) to reach the equivalence point?
Wednesday, March 27, 2013 at 3:37pm

Chemistry titrations
25.00mL of an unknown sulfuric acid solution is titrated to the second equivalence point with 21.02mL of 0.420M potassium hydroxide solution. What is the concentration of the sulfuric acid solution?
Wednesday, March 27, 2013 at 3:37pm

Chemistry
A horizontal piston contains 34kg of water that is saturated at 36ºC. Heat is transferred to the water until 80% of the water vaporizes If the piston moves very slowly, calculate the work done by surroundings on the system during this process.
Wednesday, March 27, 2013 at 3:36pm

Chemistry
balance Single replacement reactions and name of the products. 1. Zn+Cu3(PO4)2= 2. Na+F2O3= 3. Li+HNO3=
Wednesday, March 27, 2013 at 2:59pm

Chemistry
1. Which metal is the most easily oxidized? A.) highly active metal *B.) moderately active metal C.) slightly active metal D.) an inactive metal 2. What happens in a voltaic cell? *A.) Chemical energy is changed to a electrical energy. B.) Electrical energy is changed to ...
Wednesday, March 27, 2013 at 2:32pm

Chemistry
If the heat of combustion for a specific compound is -1010.0 kJ/mol and its molar mass is 46.03 g/mol, how many grams of this compound must you burn to release 388.00 kJ of heat?
Wednesday, March 27, 2013 at 1:56pm

Chemistry
When a 5.00-g sample of KCl is dissolved in water in a calorimeter that has a total heat capacity of 3.978 kJ·K–1, the temperature decreases by 0.290 K. Calculate the molar heat of solution of KCl.
Wednesday, March 27, 2013 at 1:47pm

CHEMistry
A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/K. The observed increase in temperature is 21.1 K at a constant pressure of one bar. Using ...
Wednesday, March 27, 2013 at 1:44pm

chemistry
write the ionic equation and the balanced net-ionic equation for the following equations: Al2O3(s) + 6 HCl(aq) = 2 AlCl3(aq) + 3 H2O(l) And H2SO3(aq) + 2 KOH(aq) = K2SO3(aq) + 2 H2O and 2 HC2H3O2(aq) + Ca(OH)2(aq) = Ca(C2H3O2)2(aq) + 2 H2O and the final one is H2SO4(aq) + 2 ...
Wednesday, March 27, 2013 at 1:17pm

Chemistry
How do I quickly identify whether or not a salt is soluble?
Wednesday, March 27, 2013 at 1:08pm

chemistry
When 1219 J of heat energy is added to 40.4 g of ethanol, C2H6O, the temperature increases by 12.3 °C. Calculate the molar heat capacity of C2H6O. (In J)
Wednesday, March 27, 2013 at 12:29pm

Chemistry
Why can't NH_3_ donate a proton and act as a Bronsted-Lowry acid?
Wednesday, March 27, 2013 at 12:01pm

chemistry
write and balance Solid aluminum carbonate decomposes to form solid aluminum oxide and carbon dioxide and carbon dioxide gas
Wednesday, March 27, 2013 at 11:24am

chemistry
Calculate the solubility of Mn(OH)2 in grams per liter when buffered at each of the following. (a) pH 7.7 (b) pH 9.6 (c) pH 11.3
Wednesday, March 27, 2013 at 10:35am

Chemistry
A student was synthesizing aspirin in the lab. Using the amount of limiting reactant, she calculated the mass of aspirin that should form as 5.24g. When she weighed her aspirin product on the balance, it mass was 2.23g. What is the percent yield of the aspirin?
Wednesday, March 27, 2013 at 1:05am

chemistry
for the reaction of 14.69 g of ethyl alcohol with 22.5 g of oxygen. which is the limiting reagent? how much CO2 will be produced? if 19.5 g of CO2 is actually produced, what is the percent yield? C2H5OH(1) + 3 O2 (g) - 2 CO2 (g) + 3H2O(g)
Tuesday, March 26, 2013 at 11:53pm

chemistry
Which 0.10M solution below has the lowest pH? a) NaCl b) KCN c) LiF d) RbClO e) all have the same pH
Tuesday, March 26, 2013 at 11:04pm

Chemistry
Which precipitate should react when HCl is added? Give REASONS for your prediction. The anions i have are Co3 and SO4 i wrote none of them react with HCl. I dont know what to write for the reason though please help me woth this one. Thanks!!!!
Tuesday, March 26, 2013 at 10:45pm

chemistry
53.0 mL of a 1.50 M solution is diluted to a total volume of 258 mL. A 129-mL portion of that solution is diluted by adding 195 mL of water. What is the final concentration? Assume the volumes are additive.
Tuesday, March 26, 2013 at 10:27pm

chemistry
A metal block of mass 11.5 g gives off 360 J of heat while cooling from 99.7 to 32.5 oC. What is the specific heat of the metal in J g-1 oC-1?
Tuesday, March 26, 2013 at 10:27pm

Chemistry 140A
A gas cylinder containing 6.38 mol of neon has a pressure of 491 mm Hg at 295 K. If 3.22 mol of helium is added to this cylinder, at constant temperature and volume, what will be the pressure in the cylinder?
Tuesday, March 26, 2013 at 8:45pm

chemistry
i am going crazy trying to figure this out. i just completed an experiment with heats of fusion and vaporization but for some reason i cant answer and explain this question would 20.0g of steam at 100 degree celsius be enough to melt 20.0g of ice at 0 degrees celsius? please ...
Tuesday, March 26, 2013 at 8:34pm

Chemistry
If you have 20.0g of a Maalox tablet, and 40mL of .1 M HCI, how much extra help from NaOH would you need to bring the acid to neutral? Back titrate using .05 mL NaOH, drop by drop. Please put this into a formula for me to figure out. Thanks.
Tuesday, March 26, 2013 at 7:30pm

chemistry
How many grams of ZnCl2 will be produced from 48 grams of zinc and 30 grams of HCL
Tuesday, March 26, 2013 at 7:27pm

chemistry
Suppose 87.9 grams of FeCl3 reacts with excess aluminum metal to produce 22.3 grams of Fe. What would be the % yield? FeCl3 + Al --> AlCl3 + Fe
Tuesday, March 26, 2013 at 7:09pm

chemistry
A piece of solid carbon dioxide with a mass of 5.60 g is placed in a 10.0-L vessel that already contains air at 715 torr and 23 C
Tuesday, March 26, 2013 at 6:06pm

Chemistry Solubility help!!!!!!!!!
INFORMATION: [HCl] = 0.1388 M We placed 0.5 g Ca(OH)2 in 100 mL of the following solutions: Flask A: Distilled Water (7.4 mL of HCl needed to titrate) Flask B: 0.05 NaOH (12.1 mL of HCl needed to titrate) Flask C: 0.025 NaOH (10.8 mL of HCl needed to titrate) Flask D: 0.0125 ...
Tuesday, March 26, 2013 at 5:51pm

analytical chemistry
compund x is known to absorb at 510nm. If you dilute a solution containing x by 1/4, by how much does the absorbance increase or decrease. if it stays the same just state it stays the same.why
Tuesday, March 26, 2013 at 4:49pm

chemistry
A generic salt, AB, has a molar mass of 293 g/mol and a solubility of 2.20 g/L at 25 °C. What is the Ksp of this salt at 25 °C?
Tuesday, March 26, 2013 at 4:10pm

chemistry
A generic salt, AB, has a molar mass of 293 g/mol and a solubility of 2.20 g/L at 25 °C. What is the Ksp of this salt at 25 °C?
Tuesday, March 26, 2013 at 4:08pm

chemistry
why spectrophotometric bioassay indirectly determine the concentration of glucose in solution
Tuesday, March 26, 2013 at 3:57pm

Chemistry
How much silver is present in 3.5 ml of a 1 molar silver nitrate solution?
Tuesday, March 26, 2013 at 3:19pm

Chemistry
Volume of reaction flask is 2ml. There are 273 nanomoles of molecular oxygen (O2)/ml of reaction volume at 25*C. What is the amount of atomic oxygen (nanomoles) in the reaction flask?
Tuesday, March 26, 2013 at 2:09pm

chemistry
85.0 of is initially at room temperature (22.0). A chilled steel rod at 2.0 is placed in the water. If the final temperature of the system is 21.2, what is the mass of the steel bar? Specific heat of water = 4.18 Specific heat of steel = 0.452 My answer was 32.752. I rounded ...
Tuesday, March 26, 2013 at 1:37pm

Chemistry
Enough of a monoprotic acid is dissolved in water to produce a 0.0190 M solution. The pH of the resulting solution is 2.33. Calculate the Ka for the acid.
Tuesday, March 26, 2013 at 1:15pm

chemistry
A certain weak base has a Kb of 8.40 × 10-7. What concentration of this base will produce a pH of 10.34?
Tuesday, March 26, 2013 at 1:15pm

Chemistry
Using chemical equations, show how the triprotic acid H3PO4 ionizes in water. Phases, such as (l) or (aq), are optional.
Tuesday, March 26, 2013 at 1:14pm

chemistry
how many moles of O2 are contained in 6.53 L with 297 K and 6.6 atm
Tuesday, March 26, 2013 at 12:06pm

Chemistry
If your solution’s final volume of 32.55 mL yields 3.6 grams of AgCl, determine the Molarity of the final solution. Also, how many milliliters of a 1.85 M solution of AgNO3 did you add to an excess of aqueous NaCl to provide the 3.6 grams of AgCl? Actually this question ...
Tuesday, March 26, 2013 at 12:25am

chemistry
provide the appropriate IUPAC name for the following alcohol. designate e or z 8 carbon chain double bonds between 4 and 5 and 6 and 7 methyl group on 6 OH on the second carbon [the only hint i got from this homework is to begin my answer with octadien-2-ol. can someone help ...
Monday, March 25, 2013 at 10:57pm

Chemistry
Performing a gravimetric analysis of Ca2+. 25 mL of unknown [Ca2+} added to 25 mL of 0.15 (NH4)2C2O4 and 75 mL of HCl. Urea also added. H2NCONH2 + 3H2O --heat→ CO2 + 2NH4 + 2OH CaC2O4*H2O --> Ca2+ + C2O42- [Ca2+]unknown=0.06028 M <--0.0015433 moles of Ca2+/0.025 L ...
Monday, March 25, 2013 at 10:32pm

Chemistry
How many grams of silver will be produced on the reaction of 50.00g iron metal with an excess of a copper (ii) sulfate solution ?
Monday, March 25, 2013 at 10:17pm

chemistry quick question
I need help with something and can't find this anywhere online. my structure looks like this OH CH2 CH3CH2CH2CHCHCH2CH3 CH3 So that OH looks like it is on a ethyl group. I need to write the IUPAC name and I wrote 3-methyl-4-heptanol but realized my mistake as that would ...
Monday, March 25, 2013 at 10:08pm

chemistry
NaCl(s) + H2O(l) <--> Na(aq) + Cl(aq) If you added chloride ions to the above equilibrium, what would happen to the concentration of the products, and the concentration of the reactants? I know the equilibrium would shift to the left, and I am guessing the concentration ...
Monday, March 25, 2013 at 9:48pm

Organic Chemistry
please homework help A bowl of 582 g of water is placed in a microwave oven that puts out 729 watts (J/s). How long would it take in seconds to increase the temperature of the water from 12.0oC to 46.6oC?
Monday, March 25, 2013 at 8:10pm

chemistry
For the reaction CO2 + H2 <--> CO + H20 + heat, indicate how the change in condition will shift the equilibrium (ie right or left) a. Removal of CO2 b. Addition of H2 molecules c. Increase volume of reaction vessel d. Addition of catalyst e. Refrigerate reaction vessel
Monday, March 25, 2013 at 7:33pm

Chemistry
Hi, could someone please take a look at my solution to this problem and let me know if it's correct? I would really appreciate some help. Calculate the theoretical yield for K3[Fe(C2O4)3]*3H2O; 491.258 g/mol Mass of Ferrous Ammonium Sulfate Hexahyrdreate: 4.01 g, 392.17 g/...
Monday, March 25, 2013 at 7:24pm

Chemistry
20 ml of 0.1 M acetic acid was mixed with 25 ml of 0.1 M Sodium Acetate. The pH was measured to be 4.43. 5 ml of 0.1 M Sodium Hydroxide was added to the buffer and the pH was measured to be 4.60. Calculate the pH of the buffer before and after the addition of NaOH.
Monday, March 25, 2013 at 7:17pm

chemistry
how can I find the Liters of solution. the solution is salt (NaCl) mixed in water (H20) ?
Monday, March 25, 2013 at 7:06pm

Chemistry
1 g of acid was mixed with 120 ml of distilled water and the solution was filtered into a clean dry beaker. A 25 ml aliquot of this solution was titrated with 0.1120 M NaOH. The pH of the acid was recorded to be 4.42. Calculate the initial concentration of the weak acid and ...
Monday, March 25, 2013 at 6:12pm

Chemistry
Solid mercury breaks down when heated forming the elements mercury and oxygen. write an equation for this reaction
Monday, March 25, 2013 at 5:39pm

organic chemistry
Did a grignard experiment where we were supposed to form triphenylmethanol but something went wrong. When we heated up the mixture with the petroleum ether, it didn't solidify, it turned dark and oily. What went wrong?
Monday, March 25, 2013 at 5:00pm

Chemistry
Your space ship has docked at a space station above Mars. The temperature inside the space station is a carefully controlled 24oC at a pressure of 689 mm Hg. A balloon with a volume of 426 ml drifts into the airlock where the temperature is -88oC and the pressure is 0.160 atm...
Monday, March 25, 2013 at 2:37pm

Chemistry
A balloon from the local toy store has a volume of 6.6 liters and an internal pressure of 2.4 atmospheres at 22°C. How many moles of gas does it contain?
Monday, March 25, 2013 at 2:35pm

Chemistry
A sample of gas has a volume of 8.1 liters at 1 atmosphere pressure and 203.0 K. What is its volume (liters) at STP?
Monday, March 25, 2013 at 2:34pm

Chemistry
A sample of gas with a volume of 14.9 liters at 2.6 atmospheres pressure and a temperature of 25°C is allowed to expand to a volume of 29.3 liters at a temperature of 15°C. What is the final pressure (atm)atof the gas?
Monday, March 25, 2013 at 2:34pm

Chemistry
A small cylinder of compressed gas has a volume of 396.6 ml and contains 47.9 g of CO2 at 25°C. What is the pressure (atm) inside the cylinder?
Monday, March 25, 2013 at 2:33pm

Chemistry
A 3.0 L volume of methane gas is cooled from 59.4°C to 30.0°C. If the pressure remains constant, what is the final volume (L)?
Monday, March 25, 2013 at 2:32pm

Chemistry
If a gas has a pressure of 3.0 atm at 12.8°C, what is its pressure (atm) at 25.9°C?
Monday, March 25, 2013 at 2:32pm

Chemistry
If a sample of gas occupies 2.1 ml at a pressure of 896 torr, what volume (ml) will it occupy at a pressure of 316.8 torr. I really need an answer, but also please show me how to work this problem.
Monday, March 25, 2013 at 2:31pm

chemistry
a 23.74 mL volume of .0981 M NaOH was used to titrate 25 mL of a weak monoprotic acid solution to the stoichiometric point. determine the molar concentration of the weak acid solution. express in correct sig figs.
Monday, March 25, 2013 at 1:34pm

organic chemistry
what type of feature will be observd in the ei mass spectrum of chlorobenzene?
Monday, March 25, 2013 at 1:00pm

chemistry
how much heat is required to vaporize 343g of liquid ethanol at its boiling point?
Monday, March 25, 2013 at 12:25pm

chemistry
In Flask A, you reacted 5.10 g Mg with 0.447 mol HCl. In Flask B, you reacted 24.21 g Mg with 0.998 mol HCl. Which ballon will inflate the most?
Monday, March 25, 2013 at 12:02pm

Chemistry
A solution is prepared by dissolving 0.12 mol of acetic acid and 0.12 mol of ammonium chloride in enough water to make 1.0 L of solution. Find the concentration of ammonia in the solution.
Monday, March 25, 2013 at 11:52am

Chemistry
Carbon disulfide is prepared by heating sulfur and charcoal. The chemical equation is: S2(g)+C(s)<-> CS2(g) Kc=9.40 at 900K How many grams of CS2(g) can be prepared by heating 16.8 moles of S2(g) with excess carbon in a 9.80 L reaction vessel held at 900 K until ...
Monday, March 25, 2013 at 9:39am

Chemistry
Calculate the volume of 0.3MHCL used to neutralise NaOH solution
Monday, March 25, 2013 at 9:36am

Chemistry
At a certain temperature, the equilibrium constant, Kc, for this reaction is 53.3. H2(g)+I2(g) <-> 2HI(g) At this temperature, 0.300 mol of H2 and 0.300 mol of I2 were placed in a 1.00-L container to react. What concentration of HI is present at equilibrium?
Monday, March 25, 2013 at 9:36am

chemistry
N2(g)+H2(g)-NH3(g) Calculate the volume of ammonia gas produced when20cm3 of nitrogen gas was reacted with an excess of hydrogen gas
Monday, March 25, 2013 at 4:02am

MATHS
in a class of 60 students,the number of students who pass biology is 6 more than the number who pass chemistry.every student passed at least one of the two subject.how many pass in only biology.how many pass in only chemistry.
Monday, March 25, 2013 at 3:20am

Chemistry
A gas in a discharge tube consists entirely of ions of the same element, of the same charge. Each ion has only one remaining electron. The voltage between the electrodes of the gas discharge tube is increased from zero. Electrons are accelerated across the potential, and then ...
Monday, March 25, 2013 at 1:46am

Chemistry
What is the bond order of BN-
Monday, March 25, 2013 at 1:24am

chemistry
An electron of wavelength 1.74*10-10m strikes an atom of ionized helium (He+). What is the wavelength (m) of the light corresponding to the line in the emission spectrum with the smallest energy transition?
Monday, March 25, 2013 at 1:01am

chemistry
Aluminum fluoride, AlF3, exists as a gas at 1000 degrees C. (a) The Al-F bond energy is observed to be 659 kJ/mole. Calculate the Al-Al bond energy if the F-F bond energy 154.8 kJ/mol. Calculate the % ionic character of the Al-F bond.
Monday, March 25, 2013 at 12:49am

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