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Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
What is the oxidation state and covalency of [AlBr(Na3)5]+5
Sunday, July 22, 2012 at 3:33am

Chemistry
work out the [OH-], [H+] and pH of the solution formed when 0.500L of 0.250 M hydrochloric acid solution is mixed with 0.500 L of a 0.250 M calcium hydroxide solution.
Sunday, July 22, 2012 at 3:11am

chemistry
Kp for the reaction CO2(g) + C(s) 2CO(g) is 1.47 at 727°C. Calculate Kc at this temperature Answer A. 0.0179 B. 0.0246 C. 121 D. 87.7 E. 1.47
Saturday, July 21, 2012 at 11:22pm

chemistry
Concerning the following reaction at equilibrium: 3Fe(s) + 4H2O(g) Fe3O4(s) + 4H2(g), increasing the concentration of the Fe(s) would: Answer A. Shift the equilibrium to the right B. Shift the equilibrium to the left C. No change D. Increase the value of the equilibrium ...
Saturday, July 21, 2012 at 11:21pm

chemistry
For the reaction at equilibrium: 3Fe(s) + 4H2O(g) Fe3O4(s) + 4H2(g), removing some of the product, Fe3O4(s), would: Answer A. Increase the value of the equilibrium constant, K B. No change C. Decrease the value of the equilibrium constant, K D. Shift the equilibrium to the ...
Saturday, July 21, 2012 at 11:21pm

chemistry
The solubility of silver chloride can be increased by dissolving it in a solution containing ammonia. AgCl (s) Ag+ (aq) + Cl- (aq) K1 = 1.6 x 10-10 Ag+ (aq) + 2NH3 (aq) Ag(NH3)2+ (aq) K2 = 1.5 x 107 What is the value of the equilibrium constant for the overall reaction? AgCl (...
Saturday, July 21, 2012 at 11:20pm

chemistry
When the following reaction is at equilibrium, which of these relationships is always true? 2 O3(g) 3 O2(g) A. [O3]2 = [O2]3 B. Kc[O2]2 = [O3]3 C. [O3] = [O2] D. Kc[O3]2 = [O2]3 E. Kc[O2]3 = [O3]2
Saturday, July 21, 2012 at 11:19pm

chemistry
A reaction with an equilibrium constant Kc = 1.5 x 1021 would consist of which of the following at equilibrium: A. some reactants and products with reactants slightly favored B. essentially all products C. essentially all reactants D. approximately equal reactants and products...
Saturday, July 21, 2012 at 11:18pm

chemistry
A reaction with an equilibrium constant Kc = 1.5 x 10-25 would consist of which of the following at equilibrium: A. some reactants and products with products slightly favored B. essentially all products C. some reactants and products with reactants slightly favored D. ...
Saturday, July 21, 2012 at 11:17pm

chemistry
Kp for the reaction is 1.47 at 727°S CO2(g) + C(s) 2CO(g) Calculate Kc at this temperature
Saturday, July 21, 2012 at 11:12pm

Chemistry
Given a diprotic acid, H2A, with two ionization constants of Ka1 = 3.9× 10–2 and Ka2 = 5.9× 10–8. Calculate the pH and molar concentrations of each protonated form for a: (a)0.135 M solution of H2A pH= [H2A]= [HA]= [A2-]= (b)0.135 M solution of NaHA pH= [...
Saturday, July 21, 2012 at 3:48pm

chemistry
What is the energy of an electron with a principle quantum number of n=2
Saturday, July 21, 2012 at 10:54am

Chemistry
Given a diprotic acid, H2A, with two ionization constants of Ka1=3.9E-2 and Ka2=5.9E-8. Calculate the pH and molar concentration of each protonated form for a 0.135 M solution of: (a) H2A (b) NaHA (c) Na2A
Saturday, July 21, 2012 at 12:04am

Chemistry
A concentration cell consists of two Al/Al+3 electrodes. The electrolyte in compartment A is 0.05M Al(NO3)3 and in compartment B is 1.25 M Al(NO3)3. What is the voltage of the cell at 25 degrees Celcius?
Friday, July 20, 2012 at 7:13pm

chemistry
if 25.0g of O2 gas has a temperature of 400k and a pressure of 610 mm Hg, what is its volume?
Friday, July 20, 2012 at 4:47pm

Chemistry
A voltaic cell consists of Ag/Ag+2 electrode E= 0.80 and a Fe+2/Fe+3 electrode E=0.77 with the following initial molar concentrations: [Fe+2}= 0.30 M [Fe+3]= 0.10 M [Ag+]=0.30 M. What is the equilibrium concentration of Fe+3? (Assume the anode and the cathode solutions are of ...
Friday, July 20, 2012 at 4:38pm

Chemistry
What mass of calcium phosphate form by the reaction of 50 mL of 0.2 M H3PO4 with 80 mL of 0.1 M Ca(OH)2? 2 H2PO4 + 3 Ca(OH)2 --> Ca3(PO4)2 + 6 H20
Friday, July 20, 2012 at 4:28pm

chemistry
Please...how do you calculate the reduction potential for 1 M CuSO4? I've been trying for hours......!!
Friday, July 20, 2012 at 2:13pm

chemistry
why does a desert cooler cool better on a hot dry day ?
Friday, July 20, 2012 at 11:29am

chemistry
How do you calculate the theoretical cell voltage? 1) Zn|Zn^+2 (1M)| Cu|Cu^+2 (1M) okay so by looking at example this example Calculate the emf (voltage) for the following reaction: Zn(s) + Fe2+ → Zn2+ + Fe(s) Write the 2 half reactions: Zn(s) → Zn2+ + 2e Fe2+ +2e...
Friday, July 20, 2012 at 10:02am

Chemistry
A patient receives 3.0 ml of a solution containing technetium 99 for breast image. If the activity of the technetium 99 is 9.5 mCi/mL, what is the dose received by the patient?
Friday, July 20, 2012 at 8:49am

chemistry
A gas 'X' is collected over water at 17 degree C and 750mm. pressure. If volume of the gas is 50cc., calculate the volume of the dry gas at S.T.P. (at 17 degree C the vapour pressure is 14mm.)
Friday, July 20, 2012 at 8:34am

Chemistry
Is phosphate PO3 or PO4?
Friday, July 20, 2012 at 6:10am

chemistry
How do you calculate the theoretical cell voltage? 1) Zn|Zn^+2 (1M)| Cu|Cu^+2 (1M) 2) Cu|Cu^+2 (1M)| Zn|Zn^+2 (1M) 3) Fe|Fe^+2 (1M)| Cu|Cu^+2 (1M) 4) Zn|Zn^+2 (1M)| Cu|Cu^+2 (0.1M) 5) Cu|Cu^+2 (1M)| Cu|Cu^+2 (0.1 M) Now 4 and 5 have different moles how do you calculate those ...
Thursday, July 19, 2012 at 10:01pm

chemistry .....please help
Which of the following statements does not apply to water? A. Like all liquids, water assumes the shape of its container. B. Water is a polar molecule. C. The strong surface tension of water allows it to adhere to the sides of a container and actually move up tubing via ...
Thursday, July 19, 2012 at 9:10pm

Chemistry
A buffer system contains 0.25M NH4+ and 0.19M NH3. pka of NH4 is 9.25. How many moles of NaOH must be added to 1.00L of this solution to increase the pH to 9.25?
Thursday, July 19, 2012 at 8:43pm

Chemistry
Titration of a 21.0mL solution of requires 11.0mL of 0.0350M solution. What is the molarity of the solution?
Thursday, July 19, 2012 at 8:38pm

chemistry
How do you calculate the theoretical cell voltage? 1) Zn|Zn^+2 | Cu|Cu^+2 2) Cu|Cu^+2 | Zn|Zn^+2 3) Fe|Fe^+2 | Cu|Cu^+2 4) Zn|Zn^+2 | Cu|Cu^+2 5) Cu|Cu^+2 | Cu|Cu^+2
Thursday, July 19, 2012 at 8:27pm

Chemistry
I had an equilibrium laboratory and had to answer a few questions after the lab. Here are 2 questions I can't seem to know how to answer. 1. Explain in your own words why a saturated solution in contact with some undissolved solid is considered to be an equilibrium ...
Thursday, July 19, 2012 at 1:36am

chemistry
Hello, this question is purely out of curiosity, please help to enlighten me. A hot water bag (one of those rubber ones with the rubber stopper at the top you screw in) was hidden under my bed for about a month. It was filled with a bit of water and folded in half during this ...
Wednesday, July 18, 2012 at 11:35pm

chemistry
The normal boiling point of ethanol is 78.5C. Using the following information: delta H formation (C2H5OH (g))= -234.38 kJ/mol determine the enthalpy of vaporization of ethanol. I know it should be around 39.3 according to a table in my textbook, however, I don't know how ...
Wednesday, July 18, 2012 at 11:27pm

Chemistry
so would my answer be 15ml How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2
Wednesday, July 18, 2012 at 10:53pm

chemistry
How many moles of NaOH must be added to 1.00L of this solution to increase the PH to 9.25?
Wednesday, July 18, 2012 at 10:46pm

Chemistry
How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2 I still dont get it to i times .300x30.0 then times .300 x.15 i just dont understand what i am actually suppose to multiply
Wednesday, July 18, 2012 at 10:03pm

Chemistry
How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2
Wednesday, July 18, 2012 at 9:04pm

Chemistry
About 13% of the acid in a 0.10M solution of a weak acid dissociates to form ions. What is the H3O+ concentration? What is the OH- concentration? What is the pH of the solution?
Wednesday, July 18, 2012 at 8:00pm

Chemistry
What is the HCl concentration if 72.1ml of 0.035M NaOH is required to titrate a 20.0ml sample of the acid?
Wednesday, July 18, 2012 at 7:56pm

Chemistry
C3H8 + 5O2 --> 3CO2 + 4H2O what are the oxidation #'s of each? What is being oxidized? reduced? Please explain
Wednesday, July 18, 2012 at 7:35pm

Chemistry
If 50.0 mL of methane gas at 75.5 degrees C is cooled to 5.45 degrees C, what would be its new volume?
Wednesday, July 18, 2012 at 4:16pm

college chemistry
formt he diluted unknown concentration which i found to be 1.50mg/L i have to calculate the [Fe] in the PRIMARY unknown solution... that is placed in a 250mL volumetric flask
Wednesday, July 18, 2012 at 3:50pm

chemistry
3) The melting point range of an unknown substance was determined to be 120-180 degree celcius. what can you tell about the purity of the unknown
Wednesday, July 18, 2012 at 6:29am

chemistry
1) a student used 3.50 g of salicylic acid. calculate theoretical yield 2) the actual yield (from experiment) was found to be 1.50 g less than the theoretic yield (mass), calculate the percent yield 3) t
Wednesday, July 18, 2012 at 6:27am

chemistry
why is it unwise to boil the oxolate solution in preparation for it's titration with permanganate
Wednesday, July 18, 2012 at 5:54am

Chemistry
A) A compound distributes between water (solvent 1) and benzene (solvent 2) with Kp = 2.7. If 1.0g of the compound were dissolved in 100mL of water, how much compound could be extracted by three 10-mL portions of benzene? B) If the value of Kp is 0.5 for the distribution of a ...
Wednesday, July 18, 2012 at 12:38am

Chemistry
What is the freezing point of a solution that contains 10.0 g of glucose (C6H12O6) in 100 g of H2O? Kf for water is 1.86oC/m
Tuesday, July 17, 2012 at 10:49pm

Chemistry II
A solution is made by mixing 38.0 mL of ethanol, C2H6O, and 62.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C?
Tuesday, July 17, 2012 at 8:47pm

Chemistry II
Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent. When 3.28 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 8.43 °C. ...
Tuesday, July 17, 2012 at 8:09pm

chemistry 12
hey i was wondering, i have this question: Sketch a pH curve for the titration of 40.00mL of 0.100 M hydrazine, H2NNH2, having a K of 3.0x10^-6 by 0.100 M HCIO4 i know you can t sketch but could you tell me what to do with the "K of 3.0x10^-6" i could sketch the ...
Tuesday, July 17, 2012 at 7:07pm

Chemistry
I have a question for chem 1LD webworks number 4. it asks to repeat the previous question steps and find the delta H for the high spin and low spin for Fe(ox)3 3- but calculate with B3LYP, 6-31G* instead of a semi-empirical
Tuesday, July 17, 2012 at 6:22pm

Chemistry
Describe what hard water is and how a water softening unit works. Provide balanced chemical equations to show how sodium sulphate can remove these ions (Magnesium and Calcium). The first was no problem, but I am having trouble trying to get through the second part balancing ...
Tuesday, July 17, 2012 at 4:17pm

chemistry
what are all the names of the compound CH3OH?
Tuesday, July 17, 2012 at 12:43pm

Chemistry
If 1.22 grams of magnesium reacts with 100 ml of 6.02 M HCl solution. How much heat is evolved? Density of the HCl solution is 1.10 g/ml. Assume the specific heat of water 4.184 J/gC is the specific heat of the solution. Mg  +  2 HCl   à  MgCl2&...
Tuesday, July 17, 2012 at 12:33am

Chemistry
Consider a segment of water in the ocean that has a saturation solubility of 7.5 mg/L of O2. If there are algae in this body of water consuming CO2 at 1.0 mg/hr, how quickly will the water reach saturation if it starts at no O2 dissolved?
Monday, July 16, 2012 at 8:40pm

Chemistry
0.000341 g fluorescein (332.32 g/mol) is dissolved in 255 mL solution of ethanol. The density of ethanol is 0.785 g/mL. What is the concentration of the solution in molarity (M)?
Monday, July 16, 2012 at 8:26pm

Chemistry
A sample of ammonia gas was allowed to come to equilibrium at 400 K. 2NH3(g) --> N2(g) + 3H2(g) At equilibrium, it was found that the concentration of H2 was 0.0584 M, the concentration of N2 was 0.0195 M, and the concentration of NH3 was 0.430 M. What was the initial ...
Monday, July 16, 2012 at 5:44pm

chemistry
At –14.5 °C (a common temperature for household freezers), what is the maximum mass of aspartame (C14H18N2O5) you can add to 3.00 kg of pure water and still have the solution freeze
Monday, July 16, 2012 at 4:57pm

Chemistry
The absorbance of a chlorophyll a standard solution in ethanol (density = 0.785 g/mL) is measured in a 1.3 cm cuvette or path length. The absorbance is 0.435 and the molar absorptivity coefficient is 86,300 M–1cm–1. The molecular weight for chlorophyll a is 893.49 g/...
Monday, July 16, 2012 at 3:36pm

Chemistry
The absorbance of a chlorophyll a standard solution in ethanol (density = 0.785 g/mL) is measured in a 1.3 cm cuvette or path length. The absorbance is 0.435 and the molar absorptivity coefficient is 86,300 M–1cm–1. The molecular weight for chlorophyll a is 893.49 g/...
Monday, July 16, 2012 at 3:35pm

Chemistry
For the reaction 2NH3(g) 3H2(g) N2(g) at 472oC equilibrium is established when [H2] =0.0200M, [N2] = 0.0100M and [NH3] = 5.37x10^_8 M. What is the equilibrium constant for the reverse reaction?
Monday, July 16, 2012 at 12:58pm

Chemistry
0.000333 g fluorescein (332.32 g/mol) is dissolved in 225 mL solution of ethanol. The density of ethanol is 0.785 g/mL. What is the concentration of the solution in molarity (M)? How many ppm? I already know that the molarity is 4.45E-6. I just need help on trying to find the ...
Monday, July 16, 2012 at 12:23pm

Chemistry
If you reclaim 0.250g Ag from AgNO3, how much AgNO3 did you have to begin with?
Monday, July 16, 2012 at 11:56am

chemistry
wh should the maximum percent yield never be above 100%
Monday, July 16, 2012 at 5:51am

chemistry
95.0 g of0.0 degrees celsius ice is added to exactly 100 g of water at 60.0 degrees celsius. when the temperature of the mixture first reaches 0.0 celsius the mass of the ice present is?
Sunday, July 15, 2012 at 11:33pm

chemistry
[NaOH]= 0.113M V of NaOH needed to titrate = 0.0037L V of unknown weak organic acid = 0.025L Find: The initial concentration of this weak acid.
Sunday, July 15, 2012 at 11:27pm

chemistry
Run # Volume NaOH used (mL) 1 4.1 2 4.3 3 2.8 Concentraion of NaOH: 0.113 M pH of acid: 2.84 the questions are: #moles of NaOH: ? initial acid concentration: ? Determine the Ka and pka of the weak acid: ? So here is what I did: Shaked for several minutes about 1 g of the acid ...
Sunday, July 15, 2012 at 7:53pm

Chemistry
So I did a titration experiment using 0.01 M potassium permanganate. In an erlenmeyer flask I placed a mass sample of FeSO4- with enough DI water to have a total volume of 20-25ml. I recorded the volume of MnO4- it took for the solution to change color (react). I performed a ...
Sunday, July 15, 2012 at 4:39pm

Chemistry
A 1.90-g sample of a large biomolecule was dissolved in 25.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolecule. For carbon tetrachloride, the boiling point constant is 5.03°C ·...
Sunday, July 15, 2012 at 1:48pm

Clinical chemistry
Does anyone help me how to solve percent sol.,molarity,molality and normality in step by step?? i have this exam tom. so i really need ur help ...thanks in advance
Sunday, July 15, 2012 at 12:48pm

CHEMISTRY
WHAT IS THE COMPLETE STRUCTURAL FORMULA AND NAME FOR CH3CH2CH2CH(CH3)CH3 2. CH3CH(C2H5)CH2CH3 3. CH3CH2CHCLCH2CH2CH2CH2Cl 4. CH3CH2CH2CH2OH 5. CH3CH2CH2CH2COOH 6. CH2=C(CH3)CH2CH(CH3)CH3 7. (CH3)2CHCl 8. CH3C(CH3)2CH2C(CH3)2CH2CH2CH3 10. CH3C(triple bond)CCH3
Sunday, July 15, 2012 at 12:28pm

chemistry
What is the absolute entropy of 3.1 mol of gaseous ammonia at 1.8 bar and 298 K?
Sunday, July 15, 2012 at 12:13pm

chemistry
From the following information, calculate the standard change of enthalpy for the combustion of coal. C + O2 -> CO2 COMPOUND HEAT OF FORMATION coal 0.0 carbon dioxide -393.5 water (l) -285.9 oxygen 0.0
Sunday, July 15, 2012 at 11:29am

chemistry
Potassium permagnate +ferrous sulphate+ sulphuric acid molecular formula
Sunday, July 15, 2012 at 9:44am

CHEMISTRY
WHAT IS THE NAME OF THIS COMPOUND? 1. K2SO4? 2. Ca3(PO4)2 3. LiI 4. KMnO4 5. NaNO2 6. SnCl2 7. Fe(OH)3 8. NaClO 9. BaSO3 10. Pb(NO3)2 11. Hg2Cl2 12. (NH4)2CO3 13. MgO 14. CuBr 15. Fe2s3 pls do help me.. tnx:)
Sunday, July 15, 2012 at 8:54am

chemistry
NH4NO3(s) + H2O(l) NH4NO3(aq) ΔH = +25.7 kJ What is the final temperature in a squeezed cold pack that contains 40.0 g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18 J/(g·°C) for the solution, an initial temperature of 25.0°C, and no...
Sunday, July 15, 2012 at 8:13am

chemistry
first and second ionisation energies of mg are 740 and 1450 jmol-1 calculate percentage of mg+and mg2+ of 1g of mg absorbs 50 kj of energy
Sunday, July 15, 2012 at 1:26am

Chemistry
The reaction for my lab is Mg(s)+2HCl(aq)--> MgCl2(aq)+H2(g) I need to find the pressure of the hydrogen gas. Initial Pressure = 0.98692 atm Total Pressure = 1.64816 atm I don't know if I calculated the pressure of hydrogen gas correctly. I used the formula Total ...
Sunday, July 15, 2012 at 12:07am

chemistry
1. If half cell A has a standard reduction potential of E= -1.10 V and half cell B has a standard reduction potential of E= 0.65 V, which half-cell is the anode? 2. Which half cell has the higher potential energy? 3. Calculate Ecell for this voltaic cell.
Saturday, July 14, 2012 at 8:57pm

chemistry
Okay let me write it this way. I mixed 30 mL of 0.1 M Acetic Acid and 15 mL of 0.1 M Sodium Hydroxide and measured the pH. Then I added 5 mL of 0.1 M NaOH to this buffer and measured the pH. It's asking me: Show the calculations for the pH of the buffer before and after ...
Saturday, July 14, 2012 at 7:42pm

Chemistry
For the reaction N2O4(g)=2NO2(g), the value of K at 25 degrees XCelsius is 7.19*10^-3. Calculate N2O4 at equilibrium when NO2 =2.20 *10^122 mol/L?
Saturday, July 14, 2012 at 6:51pm

chemistry
How do I calculate the initial concentraion of an acid?
Saturday, July 14, 2012 at 6:31pm

chemistry
acetic acid: 0.1 M 30ml hydrochloric acid 0.1 M 5 ml sodium hydroxide 0.1 M 15 ml Buffer + 5ml of: 1.91 ph ph (measured): 4:52 ph HOW DO I CALCULATE PH(CALCULATED)? AND ALSO IT SAYS SHOW YOUR CALCULATION FOR THE PH OF THE BUFFER BEFIRE AND AFTER THE ADDITION OF HCL? COULD YOU ...
Saturday, July 14, 2012 at 6:28pm

Chemistry
I am stuck on this question: what mass of KCl in grams when 2.00 lbs KC10 3 is decomposed?
Saturday, July 14, 2012 at 4:36pm

Chemistry
How many grams of Calcium Chloride will be produce when 25 g of Calcium carbonate combine with 12 g of HCl
Saturday, July 14, 2012 at 2:45pm

chemistry
the volume of a gas at 273 degree cels and 2 atm pressure is 5L. What would be its volume at 0 degree celsius and 1 atm pressure ?
Saturday, July 14, 2012 at 2:43pm

Organic Chemistry
a) What would be the product formed if diphenylacetylene were reacted with aqueous sulfuric acid? b) What would be the product formed if diphenylacetylene were reacted with two equivalents of HBR?
Saturday, July 14, 2012 at 1:00pm

Organic Chemistry
How do I figure out the limiting reagent for this experiment? Preparation of diphenylacetylene! Step 1:: trans-stilbene + pyridinium hydrobromide perbromide in glacial acetic acid -----> stilbene dibromide Starting weight of trans-stilbene: 2.014g Starting weight of ...
Saturday, July 14, 2012 at 12:10pm

chemistry
A solution is prepared by dissolving 20.2 {\rm mL} of methanol ({\rm{CH}}_3 {\rm{OH}}) in 100.0 {\rm mL} of water at 25 ^\circ {\rm C}. The final volume of the solution is 118 {\rm mL}. The densities of methanol and water at this temperature are 0.782 {\rm g/mL} and 1.00 {\rm ...
Saturday, July 14, 2012 at 10:14am

chemistry
in a particular experiment, 150.0 g of ammonium chloride were reacted with 290.0 g of barium hydroxide octahydrate, producing 157.2 g of water 1. find the limiting reagent in this situation 2. calculate the theoretical yield of water 3. calculate the percent yield of water 4. ...
Saturday, July 14, 2012 at 8:22am

chemistry
how much NaOH which is 25% pure required to neutralise 100mL 10N HCl
Saturday, July 14, 2012 at 6:17am

Chemistry
Kidney stones are composed of crystals of calcium oxalate, CaC2O4. The solubility of CaC2O4 is 6.7 x 10-5 g per 100 ml of solution. What is the pH of a saturated solution of calcium oxalate? (Molar masses of Ca, C and O are 40.0 g/mol, 12 g/mol, 16 g/mol respectively.) Thank ...
Friday, July 13, 2012 at 9:32pm

College Chemistry
How many grams of steam and iron must react to produce 375g of magnetic iron oxide, Fe3So4
Friday, July 13, 2012 at 4:34pm

chemistry
E degrees (V) A galvanic cell based on the following half reaction s Au3+ 3e- ----> Au 1.50 Mg2+ 2e- ------> Mg -2.37 The cell is set up at 25 C with [Mg2+] = 1.00 x 10^-5 M The cell potential is observed to be 4.01 V. Calculate the [Au3+] that must be present. Au3+ = ...
Friday, July 13, 2012 at 10:24am

chemistry
Consider the galvanic cell constructed from the following metals and their corresponding metal ions: E degrees (V) M^3+^ + 3e^-^ ----> M 0.29 N^2+^ + 2e^-^ ----> N 0.61 calculate the value of K for the cell reaction at 25C
Friday, July 13, 2012 at 10:23am

chemistry
an aqueous solution of pdcl2 is electrolyzed for 27.4 seconds during this time 0.1064 g of Pd is deposited on the cathode. Calculate the average current used in the electrolysis.
Friday, July 13, 2012 at 10:23am

chemistry
Ph of 10^(-8)M aqs.h2so4
Friday, July 13, 2012 at 9:45am

Chemistry
I want to make solutions of pH 3.5, 4.5, 6.5, 8.5 and 10.5 from 0.1 M HCl and 0.1 M NaOH. how many ml shall I take from each solution to make these pH levels?
Friday, July 13, 2012 at 4:21am

Chemistry
At a depth of 200 meters in Lake Nyos, the pressure of pure CO2, released from a volcanic vent is equal to the water pressure at this depth. P (pascals) = density * g * height. Density= 1000 kg/m^3, g= 9.8m/s^2. Using this Pascal pressure, convert it, and calculate the ...
Friday, July 13, 2012 at 12:44am

chemistry
1) Aluminum Chloride- Red- PH: 4.0 2) Sodium Carbonate - Violet- PH: 9.5 Ammonium Acetate - Yellow - PH: 6.5 the question is: explanation with equation to show hydrolysis Could you please help me thank you.
Thursday, July 12, 2012 at 9:54pm

College Chemistry
given the concentration of 125.0mg/L of Fe(2+)in the stock solution and the volume used which is (1.00mL) how do i calculate the concentration of iron(II) ions in mg/L? i pipet 1.00mL of the stock into a 250ml volumetric flask!
Thursday, July 12, 2012 at 9:51pm

chemistry
a certain radioactive nuclide has a half life of 5.00 hour. Calcuate the decay rate for 1.000 mole of this nuclide __________ decay s-1
Thursday, July 12, 2012 at 7:23pm

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