Tuesday
May 26, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
what products would form after hydrogenation of 2-methyl-1-butene? after halogenation (cl2)?
Sunday, April 26, 2015 at 3:42pm

Chemistry
I need help, I don't know how to approach this question The free energy generated by ion movement in the cell is used by the cell to do work. Compute the minimum number of millimoles of sodium that would be needed to pump one millimole of calcium ions if the following ...
Sunday, April 26, 2015 at 3:40pm

Chemistry 2
Does the reaction P4(s, white) + 5 O2(g) P4O10(s) occur spontaneously at 298 K and standard state conditions? Calculate the value of capital delta S°univ. Honestly do not know where to start.
Sunday, April 26, 2015 at 10:14am

chemistry
Can anyone help me with this question. Propose a method in detail to determine the concentration of two components, quinine and anthracene in a mixture using fluorimetry. You have access to pure sulutes and an appropriate solvent. The excitation and emission spectra of quinine...
Sunday, April 26, 2015 at 1:23am

CHemistry
Given the following information calculate the heat of formation of C2H4. C2H4 + 3 O2 ¡æ 2 CO2 + 2 H2O ¥ÄH¡Æ = -414 kJ/mol C + O2 ¡æ CO2 ¥ÄH¡Æ = -393.5 kJ/mol H2 + ¨ö O2 ¡æ H2O ¥ÄH&...
Sunday, April 26, 2015 at 1:07am

chemistry
Hess¡¯ law says that when we add reactions together we can also add the enthalpies. Given the following set of reactions, use Hess¡¯ Law to calculate the enthalpy of the reaction given below. N2H4 + H2 ¡æ 2 NH3 ¥ÄH¡Æ = ? ...
Sunday, April 26, 2015 at 1:07am

analytical chemistry
Consider a general reaction where a ligand L and a metal ion Mn+ form a complex with m number of ligands (L) coordinated to each metal ions. Assume the metal is colorless. The ligand and metal solutions were mixed at molar fractions (and same total molar concentration). The ...
Saturday, April 25, 2015 at 10:55pm

Chemistry 2
For the gaseous reaction of carbon monoxide and chlorine to form phosgene, (COCl2), calculate each of the following. (a) Calculate S° at 298 K I got -136.76 J/K using delta S = sum of delta S of products minus sum of delta S of reactants which is the right answer. But I ...
Saturday, April 25, 2015 at 5:13pm

Chemistry
Need some direction.. where do I start? Vinegar is a 5% (mass/mass) solution of acetic acid in water. If vinegar has a density of 1.06 g/mL, what is the concentration in molar?
Saturday, April 25, 2015 at 12:26pm

CHEMISTRY
question 1.Explain why fructose and alpha-hydroxyketose reacts with benediict’s solution. what structural arrangement is necessary for the reaction to occur? question 2. When aldose react with Barfoed reagent what type of organic compound forms. What type of chemical ...
Saturday, April 25, 2015 at 7:31am

chemistry
For the following chemical reaction, how many moles of silver iodide (AgI) will be produced from 4 mol of calcium iodide (CaI2)?
Friday, April 24, 2015 at 10:23pm

chemistry
In a 1.00 L container at 272 degrees C 1.3 mol of N2 and 1.65 mol of H2 are added at equilibrium 0.100 mol NH3 is present calculate the equilibrium concentrations of N2 and H2 2NH3(g)<-->N2(g)+3H2(g)
Friday, April 24, 2015 at 10:15pm

Chemistry
I have water pH 7.0 insulation with various other things that do not affect pH, I am trying to add X amount of HCL to lower the solution to a pH of 1.5 I know pH=-log[HCl] but I'm not sure how to approach this problem, after this I am then trying to add NaOH to return the ...
Friday, April 24, 2015 at 12:32pm

Chemistry
What is name of this according to the IUPAC: a benzene that has an ethyl group on an its carbon , and a double methyl group on another carbon ? thanks
Friday, April 24, 2015 at 10:12am

chemistry
A mixture is made using A 50.0 mL sample of a 0.20 M aqueous solution of NAOH was added to 50.0 mL of a 0.20 M aqueous solution of HCl.What is its pH at 25.0 °C?
Friday, April 24, 2015 at 3:47am

chemistry
At a certain temperature, the Kp for the decomposition of H2S is 0.734.Initially, only H2S is present at a pressure of 0.102 atm in a closed container. What is the total pressure in the container at equilibrium?
Friday, April 24, 2015 at 3:20am

chemistry
Is C2O4H- more likely to act as an acid or base
Friday, April 24, 2015 at 1:24am

chemistry
If you had left your copper(II) nitrate/potassium hydroxide precipitate stand for a while, the precipitate would turn into a black powder. The copper doesn’t reduce in this reaction, but one mole of water is produced from the reaction of one mole of the copper precipitate...
Thursday, April 23, 2015 at 10:56pm

chemistry
If 9.00 g of _27^60 Co (half-life = 5.30 y) are allowed to decay, how many grams would be left after 1.00 y and after 10.0 y? g after 1.00 y g after 10.0 y
Thursday, April 23, 2015 at 9:54pm

Chemistry
Question: Describe the procedure you would follow to determine the concentration of vitamin C in a sample if the volume of DCPIP required to reach the end point were more than the 10ml graduated cylinder could hold. The titration must still be carried out in the the 10ml ...
Thursday, April 23, 2015 at 9:33pm

Chemistry
Someone help me with my titration molarity calculation please!? I have titrated 1.000 mL of Ca(IO3)2 with 2.197 ml of 0.022 M thiosulfate. First I found the moles of thiosulfate present with 0.002197 L x 0.022 M = 4.8388E-5. The mole ratio of S2O3^-2 and IO3- should be 6:1 (...
Thursday, April 23, 2015 at 9:31pm

Chemistry
Does a k constant have a unit?
Thursday, April 23, 2015 at 9:17pm

chemistry - kinetics
Understanding the high-temperature behavior of nitrogen oxides is essential for controlling pollution generated in automobile engines. The decomposition of nitric oxide (NO) to N2 and O2 is second order with a rate constant of 0.0796 M−1*s−1 at 737∘C and 0....
Thursday, April 23, 2015 at 9:05pm

chemistry
What is the volume occupied by 0.738g of xenon gas at STP?
Thursday, April 23, 2015 at 7:22pm

Chemistry
A monoprotic acid of 0.065 M concentration has a pH of 2. 75. Is this a strong or weak acid?
Thursday, April 23, 2015 at 5:39pm

Chemistry
The molar heat of fusion for water is 6.009 kJ/mol. How much energy would be required to melt 15.11 mol ice? Answer in units of kJ. Thanks in advance!
Thursday, April 23, 2015 at 5:36pm

Chemistry
The standard molar heat of vaporization for water is 40.79 kJ/mol. How much energy would be required to vaporize 8.51 ×1010 molecules of water? Answer in units of kJ. Thanks for the help!!!
Thursday, April 23, 2015 at 5:35pm

chemistry
15.0 mL of an iodine solution of unknown molarity was titrated against a .001 M solution of S2o32-. The blue black iodine-starch complex just disappeared when 20.2 mL of thiosulfate was added. What is the exact molarity of the Ia solution
Thursday, April 23, 2015 at 3:06pm

chemistry
an old tablet of vitamin c weighed 1.022 g. It was dissolved in 500 mL water, and a 25.0 mL aliquot of this solution required 22.6 mL of .005 M I2 solution to oxidize it. Calculate the mg vitamin C in the tablet.
Thursday, April 23, 2015 at 3:03pm

Chemistry
What is the equilibrium equation for FeS(s) + 2H3O+(aq) - Fe2+(aq) + H2S(aq) + 2H2O(l) ? Explain if possible !
Thursday, April 23, 2015 at 9:55am

chemistry
how to find mass of aspirin if I used 0.2845g of the powder with 1mL of 6.0 mol/L of NaOH?
Thursday, April 23, 2015 at 5:27am

chemistry
How many milliliters of 0.748 M Mg(NO3)2 contain 1.700 g of Mg(NO3)2
Thursday, April 23, 2015 at 12:33am

Chemistry
Determine the mass of a sample of water that absorbs 1000j of heat to melt at its melting point?
Wednesday, April 22, 2015 at 11:50pm

chemistry
How to calculate the concetration on a Beer's law plot?
Wednesday, April 22, 2015 at 11:39pm

chemistry
How many milliliters of 0.303 M NaNO2 contain 1.873 g of NaNO2?
Wednesday, April 22, 2015 at 11:23pm

chemistry
How many milliliters of 0.503 M NaNO3 contain 2.528 g of NaNO3?
Wednesday, April 22, 2015 at 10:50pm

chemistry
how many moles of K2SO4 are present in 111.5 mL of 0.516 M K2SO4?
Wednesday, April 22, 2015 at 10:49pm

Chemistry
Consider the following reaction: CO(g)+2H2(g)⇌CH3OH(g) Kp=2.26×104 at 25 ∘C. Calculate ΔGrxn for the reaction at 25 ∘C under each of the following conditions. A) Standard Conditions B) at equilibrium C)PCH3OH= 1.3atm ; PCO=PH2= 1.2×10−2atm
Wednesday, April 22, 2015 at 8:25pm

Chemistry
Consider the following reaction: 2NO(g)+O2(g)→2NO2(g) Estimate ΔG∘ for this reaction at each of the following temperatures and predict whether or not the reaction will be spontaneous. (Assume that ΔH∘ and ΔS∘ do not change too much within...
Wednesday, April 22, 2015 at 8:15pm

Chemistry
I just need help with these three 1.Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen C6H12O6(s)+ 6O2(g) -> 6H2O(g) + 6CO2 (g) 2. ...
Wednesday, April 22, 2015 at 7:30pm

Chemistry
Can I call someone and talk to them
Wednesday, April 22, 2015 at 6:57pm

Chemistry HW Need answers
1.Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen C6H12O6(s)+ 6O2(g) -> 6H2O(g) + 6CO2 (g) How many liters of carbon dioxide ...
Wednesday, April 22, 2015 at 6:35pm

chemistry
How many milliliters of a 0.250 M acetic acid solution must be added to 50.0 mL of a 0.750 M NaOH solution to produce a buffer solution with pH = 4.500 ? The pH is given by which we can calculate the concentration of [H+] How do we approach the problem from there?
Wednesday, April 22, 2015 at 6:33pm

Chemistry
90/180.1559 =0.4995 0.4995*22.4 A. =11.2 Is this correct
Wednesday, April 22, 2015 at 5:39pm

Chemistry test can't fail please help (senior)
1.Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen C6H12O6(s)+ 6O2(g) -> 6H2O(g) + 6CO2 (g) How many liters of carbon dioxide ...
Wednesday, April 22, 2015 at 5:06pm

Chemistry
1.Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen C6H12O6(s)+ 6O2(g) -> 6H2O(g) + 6CO2 (g) How many liters of carbon dioxide ...
Wednesday, April 22, 2015 at 5:02pm

Chemistry
I don't know what to do once I get the .49999 number
Wednesday, April 22, 2015 at 4:51pm

Chemistry
Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen C6H12O6(s)+ 6O2(g) -> 6H2O(g) + 6CO2 (g) How many liters of carbon dioxide would...
Wednesday, April 22, 2015 at 4:29pm

Chemistry
One mole of N2 and 3 moles of H2 are placed in a flask at 375 degree celsius.? Calculate the total pressure of the system at equilibrium if the mole fraction of NH3 is found to be 0.21. The Kp for the reaction is 4.21 x 10 raise to -4
Wednesday, April 22, 2015 at 4:07pm

Chemistry test help please
How many liters of chlorine as can be produced when 1.96 L of HCl react with excess O2 at STP Show Work A.0.49L B.0.98L C.1.96L D.3.92L
Wednesday, April 22, 2015 at 4:01pm

Chemistry
Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen C6H12O6(s)+ 6O2(g) -> 6H2O(g) + 6CO2 (g) How many liters of carbon dioxide would...
Wednesday, April 22, 2015 at 3:52pm

Chemistry
Cell respiration glucose is reacted wth oxygen in body to produce carbon dioxide and water how many liters of carbon dioxide would be produced if 90.0 g of glucose completely reacts with oxygen
Wednesday, April 22, 2015 at 11:28am

AP Chemistry
Determine the volumes of 0.10 M CH3COOH and 0.10 M CH3COONa required to prepare 10.0 mL of buffer of each of the following pH values? a. Ph 3.7 b. pH 5.7 C. pH 5.7 I just need to see how to do one of them and I'll understand how to do the rest.
Wednesday, April 22, 2015 at 2:03am

Chemistry
a 40.0 ml sample of ca(oh)2 was titrated with 0.0704 m hcl. the volume of hcl needed to reach equivalence point was 18.2 ml. what was the concentration of ca2+ present in the original solution?4
Wednesday, April 22, 2015 at 1:13am

chemistry
One way to raise the pH of an acidic lake (and restore aquatic life) is to add limestone (CaCO3). How many grams of CaCO3 are needed to neutralize 1.2kL of the acidic water from the lake if the acid is sulfuric acid? H2SO4(aq)+CaCO3(s)→CO2(g)+H2O(l)+C​aSO4(aq)
Tuesday, April 21, 2015 at 10:29pm

Chemistry
Determine the pH of a solution of 12.00 mL of 0.2 M acetic acid with 10 mL of a 0.025M NaOH? (Ka = 1.8E–5) I've calculated my excess moles of acetic to be .00215. Total volume being .022L. Where do I go from here? Thanks!
Tuesday, April 21, 2015 at 9:58pm

Chemistry
40.0 grams of Al2S3 are dissolved into 200ml of water yielding 220ml of solution, what is the percent strength of the solution?
Tuesday, April 21, 2015 at 9:48pm

Chemistry
DrBob222 you were so helpful earlier in assuring me I was on the right track with the ionic equations. Your very gifted in chemistry. I have spent from a short time after that post until now banging my head against the wall trying to figure out how to balance an oxidation ...
Tuesday, April 21, 2015 at 8:57pm

Chemistry
What is the volume of 2.0 moles of an ideal gas at 290 K and 2.8 atm?
Tuesday, April 21, 2015 at 8:20pm

Chemistry
You have to prepare a pH 3.50 buffer, and you have the following 0.10M solutions available HCOOH, CH3COOH, H3PO4,CHOONa, CH3COONa, and NaH2PO4. a) What solutions would you use? b) How many milliliters of each solution would you use to make approximately 1 liter of the buffer? ...
Tuesday, April 21, 2015 at 7:55pm

Chemistry
Could you please check my work about complete ionic and net ionic equations. They really confuse me. My original equation, after I balanced, was: FeCl2(aq)+Na2S(aq)=FeS(s)+2NaCl(aq). For complete Ionic I think its: Fe^2+^(aq)+2Cl^-^(aq)+2Na^+^(aq)+S^2-^=F​eS(s)+2Na^+^(aq...
Tuesday, April 21, 2015 at 6:56pm

Chemistry
What is C7H6O3 in empirical form and how do you get there?
Tuesday, April 21, 2015 at 5:52pm

Chemistry
I am having so much trouble understanding how to classify reactions as precipitation, acid base, or oxidation reduction. In one example in particular, it reads Iron II oxide reacts with oxygen and water to yield Iron III hydroxide. I wrote out the equation as: FeO(aq)+O2(g)+...
Tuesday, April 21, 2015 at 5:08pm

chemistry
the accepted density of helium at stp is 0.18 g/L. during an expirement, 0.10g of helium with a volume of 0.54L at stp was collected. what is the percent error in this expirement? (accepted-expiremental)/accepted X 100
Tuesday, April 21, 2015 at 1:09pm

Chemistry AP
This isn't quite an HW question, I'm needing any site that gives practice Free Response problems for equilibrium for AP Chemistry if there are any for study and practice.
Tuesday, April 21, 2015 at 10:41am

Chemistry
What is the empirical formula of a magnesium oxide compound that contains 0.2717 moles of Mg and 0.1811 moles of O?
Tuesday, April 21, 2015 at 3:39am

Physical Chemistry
The weight of one atom of uranium is 238amu. Its actual weight is ......g.
Tuesday, April 21, 2015 at 12:43am

Chemistry
a student carefully measures the melting point of a solid material. she measures the range to be 81.2 - 83.7 degree. assuming she has done the measurement correctly. what can she conclude about the sample, and why
Tuesday, April 21, 2015 at 12:11am

Chemistry
Can someone please check if I have written and balanced the reaction properly? 1.In 1774 Joesph Priestley discovered oxygen by decomposing the oxide of mercury. 2HgO = 2 Hg + O2 2. Slaked lime precipitates magnesium ions from hard water. Ca(OH)2 + Mg(HCO3)2 = Ca(HCO3)2 + Mg(OH)2
Monday, April 20, 2015 at 11:24pm

Chemistry
You are given potassium carbonate solid and potassium sulfate. Both are white solids. How would you separate potassium carbonate and potassium sulfate?
Monday, April 20, 2015 at 10:41pm

Physical Chemistry
The weight of one atom of uranium is 238amu. Its actual weight is ......g.
Monday, April 20, 2015 at 10:26pm

Chemistry
Can someone answer this question? The enthalpy of combustion of solid carbon to form carbon dioxide is -393.7 kJ/mol carbon, and the enthalpy of combustion of carbon monoxide to form carbon dioxide is -283.3 kj/mol CO. Use these data to calculate ∆H for the reaction. ...
Monday, April 20, 2015 at 9:49pm

Laboratory Chemistry
The activity of a stock isotope is 10,000 DPM/0.10mL. If 0.25 ml of this stock is placed in 2.50 ml of water, what is the activity in the diluted specimen? My guess is that I just multiply the 10,000 DPM by the 1/10 dilution factor. I then come up with 1,000DPM/0.10ml. Does ...
Monday, April 20, 2015 at 8:34pm

Science (Chemistry)
Why do ionic materials dissolve so well in water, but not in Hexane?
Monday, April 20, 2015 at 8:22pm

Chemistry
2H2S(g)+3O2(g)<-->2SO2(g)+2H2O SO2(g)+Cl2(g)<-->SO2Cl2(g) I balanced so how do I find the overall equation
Monday, April 20, 2015 at 7:25pm

AP Chemistry
This is the question I am having trouble with: A voltaic cell consists of a strip of lead metal in a solution of Pb(NO3)2 in one beaker, and in the other beaker a platinum electrode is immersed in a NaCl solution, with Cl2 gas bubbled around the electrode. A salt bridge ...
Monday, April 20, 2015 at 5:28pm

Chemistry
How many grams of potassium nitrate (KNO3) are required to produce 536 g of potassium nitrite (KNO2) according to the equation below? *I've tried this question for so long and I get so many different answers in the end so please help.
Monday, April 20, 2015 at 2:49pm

Chemistry
3 NO2(g) + H2O(l)--->2 HNO3(aq) + NO(g) Suppose someone needs 25.0 kg of HNO3. How much NO2 should they start with to end up with the amount they need?
Monday, April 20, 2015 at 2:15pm

Chemistry
In a solution of a weak acid and its conjugate base, which condition has to be true for pH to equal pKa? The concentration of acid has to be greater than the concentration of base. The concentration of acid has to be equal to the concentration of base. An indicator has to be ...
Monday, April 20, 2015 at 1:06pm

Chemistry
Calculate the hydronium ion concentration of blood which has a pH of 7.24. 7.17 x 10-4 M 5.75 x 10-8 M 1.15 x 10-7 M 0.86 M none of the above I had chose 1.15*10^-7 by doing the log equation -log(1.15...) and I but it goether with -log(10*^-7.24) and it was closest to 14 and ...
Monday, April 20, 2015 at 1:03pm

Chemistry
What is the pH of a solution which has hydroxide concentration, [OH-], equal to 7.6 x 10-4 M? 0.88 3.12 10.9 13.1 none of the above I had chose 3.12 for this one and this one was also wrong. I did this because I did the equation -log(7.6*10^-4) and got 3.12.
Monday, April 20, 2015 at 12:59pm

Chemistry
How many moles of chlorine are there in 16.0 mL of 0.450 M CaCl2? 0.0072 mol 0.0144 mol 0.0216 mol 0.0375 mol none of the above I had chose 0.0072 and had submitted it in my assignment, but it had said it was wrong. I chose 0.0072 because I did this equation: 16/ 1000*0.450 ...
Monday, April 20, 2015 at 12:55pm

chemistry
How many grams of CuSO4 . 5H2O are needed to prepare 100ml of a 0.10M solution? Remember to change the given volume to liters and take the moles and convert them to grams via the molar mass to get grams of CuSO4 . 5H2O
Monday, April 20, 2015 at 12:14pm

Chemistry
Four sets of conjugate acid/base pairs and Ka of the acid are given. Which pair would be the best to form a buffer at pH = 9.2? You can use the Henderson-Hasselbalch equation to answer this question. HCNO/CNO- 3.5 x 10-4 HC2O4-/C2O4- 5.1 x 10-5 H2CO3/HCO3- 4.3 x 10-7 HCN/CN- 4...
Monday, April 20, 2015 at 12:03pm

chemistry
How many grams of oxygen gas must react to give 2.70g of ZnO? 2Zn(s)+O2(g)→2ZnO(s)
Monday, April 20, 2015 at 10:36am

Chemistry
How do you calculate the molality of a salt solution using only temperature? Is it even possible to do so? This was part of an ice cream lab and the temperature of the ice was 1.0 degrees celcius and the temperature of the ice water salt mixture was -0.4 degrees celcius but ...
Monday, April 20, 2015 at 7:07am

chemistry
How many moles are their in 10.6 L os SO2 ?
Monday, April 20, 2015 at 1:42am

Chemistry
How does the freezing process of ice cream occur? What happens to ice when salt is added?
Sunday, April 19, 2015 at 11:56pm

Chemistry
Check my work & answer please. I need to make sure I am able to do this type of problem correctly. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity ...
Sunday, April 19, 2015 at 10:03pm

chemistry
Consider an electrochemical cell based on the reaction: 2H+(aq) + Sn(s) = Sn2+(aq) + H2(g). Which of the following actions would NOT change the measured cell potential? lowering the pH in the cathode compartment addition of more tin metal to the anode compartment any of the ...
Sunday, April 19, 2015 at 8:55pm

Chemistry
Copper has a specific heat of 0.387 J/g·°C. How much energy is required to raise the temperature of 215 g of copper from 47.0°C to 164.0°C?
Sunday, April 19, 2015 at 6:48pm

Chemistry 1002
Over a period of time, the concentration of sulfuric acid in a lead storage battery of an automobile has decreased from 38 percent by mass(density=1.29 g/mL) to 26 percent by mass(1.19 g/mL). Assume the volume of the acid remains constant at 715 mL. a)Calculate the total ...
Sunday, April 19, 2015 at 6:36pm

Chemistry
An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck's constant is 6.626 × 10-34 joule seconds, the speed of light is 2.998 × 108 m/s)
Sunday, April 19, 2015 at 5:37pm

chemistry
When 6 liter of nitrogen gas reacts with 18 liters of hydrogen gas at constant temperature and pressure, how many liters of ammonia gas will be produced?
Sunday, April 19, 2015 at 4:21pm

Chemistry
Consider this real reaction, and answer the questions based on it: TiO2 (s) + HCl (aq) ==> H2O (l) + TiCl4 (aq) 1) Based on this balanced equation, if the amounts used are 3 mol TiO2 and 5 mol HCl, Which one is the limiting reactant? 2) How many moles of each reactant are ...
Sunday, April 19, 2015 at 4:10pm

Chemistry
Two atoms with charges of +1 and -1 are separated by a distance of 0.5 angstroms. What would happen to the lattice energy between ions if the distance increases to 2 angstroms? A. The lattice energy decreases by a factor of 4. B. The lattice energy increases by a factor of 16...
Sunday, April 19, 2015 at 2:20am

Chemistry
Why is Potassium and Bromide KBr? Why does Br not follow 2n2? Br = 35 electrons, 2,8,18,7 why does the shell not fill to 32 and is happy with one of Potassium electrons. Thank you kindly.
Sunday, April 19, 2015 at 1:38am

Chemistry
4. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity of 8.37 J/g-oC, density of 1.038 g/mL). In maintaining a constant engine temperature, the ...
Saturday, April 18, 2015 at 7:28pm

Chemistry
Which of the following processes are spontaneous? (Select all that apply.) a. average car prices increasing b. a soft-boiled egg becoming raw c. a satellite falling to Earth d. water decomposing to H2 and O2 at 298 K and 1 atm I thought it would c and maybe d
Saturday, April 18, 2015 at 5:31pm

Physics/Chemistry HELP!! URGENT!!
Arsenic in geomedia contaminates an aquifer by naturally occurring geological processes. The aquifer has a bulk density of 1.55 g/cm3 and a particle density of 2.63 g/cm3. The distribution coefficient, Kd value is 0.0370 L/kg. The initial concentration at the source is 40.0 &#...
Saturday, April 18, 2015 at 3:13pm

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