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March 30, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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CHEMISTRY
What should be observed during titration? My answer: We observe the change in color and change in turbidity of the sol'n. Am I right? Please add more things to be observed during titration. THANK YOU!
Monday, February 23, 2015 at 6:05am

CHEMISTRY
Cite three methods of analysis of a substance from a given sple by titrimetric method of analysis. My answer is: -direct method -indirect method -back titration method Is it right??
Monday, February 23, 2015 at 5:58am

chemistry
how to calculate nuclidic mass of 3He when its binding energy is 0.76 MeV
Monday, February 23, 2015 at 2:32am

chemistry
A closed container with a mixture of hydrogen, helium, and argon has a total pressure of 2.55 atm. The partial pressure of hydrogen is 0.700 atm and the partial pressure of argon is 705 mm Hg. What is the partial pressure of helium?
Monday, February 23, 2015 at 12:22am

Chemistry
what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble gasses but I'...
Monday, February 23, 2015 at 12:12am

chemistry
Problem: Need to prepare a 250 mL buffer of pH 7.00 using equimolar K2HPO4 and KH2PO4 solutions. Ka for phosphoric acid: Ka1=7.2 x 10^-3 Ka2=6.3 x 10^-8 Ka3=4.2 x 10^-13 I though the hard part of this was picking the right equation/Ka value, but I am not getting the right ...
Sunday, February 22, 2015 at 9:03pm

Chemistry
Using household bleach and saltwater of the same molarity, describe the quantities of each that would me needed to make 30 ml of a solution that contained 50% of the hypochlorite in household bleach.
Sunday, February 22, 2015 at 8:47pm

Chemistry
A solution is prepared by dissolving of pure HC2H3O2 and of NaC2H3O2 in of solution (the final volume). (a) What is the pH of the solution? (b) What would the pH of the solution be if of 0.250 M NaOH were added? (c) What would the pH be if of 0.40 M HCl were added to the ...
Sunday, February 22, 2015 at 7:48pm

chemistry
You add 8.7g of iron to 21.30mL of water and observe that the volume of iron and water together is 22.41mL . Calculate the density of iron.
Sunday, February 22, 2015 at 7:31pm

Chemistry
A piece of iron (Cp = 0.450 J/(gi°C)) that has a mass of 21.5 g and an initial temperature of 100.0°C is submerged in X g of water (Cp = 4.184 J/(gi°C)) at 20.0°C. The temperature of the system (iron and water) changes to 21.4°C. What is the value of X?
Sunday, February 22, 2015 at 7:20pm

Chemistry
Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ↔ SO2Cl2(g) Kp for this reaction is 5.1 x 10-2 atm-1. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L reaction vessel. After 15 minutes, the concentration of SO2Cl2 is 45.5 μg/mL. You will ...
Sunday, February 22, 2015 at 7:12pm

Chemistry
A 100 L reaction container is charged with 0.782 mol of NOBr, which decomposes at a certain temperature** (say between 100 and 150 oC) according to the following reaction: NOBr(g) ↔ NO(g) + 0.5Br2(g) At equilibrium the bromine concentration is 1.42x10-3 M. Calculate Kc (...
Sunday, February 22, 2015 at 7:11pm

Chemistry
A small candle with a mass of 6.0 g was completely burned. the heat produced heated 100 g of water from 23.0 to 33.0 Celsius if 200 g were heated by the same candle the temperature change of the water would be: I don't understand this question
Sunday, February 22, 2015 at 6:39pm

chemistry
An ice cube weighing 22.7 g at a temperature of 0.0°C is added to 125 mL of water at 27.1°C in an insulated container. What will be the final temperature after the ice has melted?
Sunday, February 22, 2015 at 6:36pm

Chemistry
I posted this question earlier but the person that answered did not include how to find the moles of the problem When 80.0 mL of HCl is added to 80.0 mL of NH3OH, the temperature increases 2.5 celsius. Assuming the final solution has the same specific heat capacity as liquid ...
Sunday, February 22, 2015 at 5:28pm

Chemistry
When 80.0 mL of HCl is added to 80.0 mL of NH3OH, the temperature increases 2.5 celsius. Assuming the final solution has the same specific heat capacity as liquid water, the heat produced in the reaction between two solutions is: I dont know how to find the moles and mass
Sunday, February 22, 2015 at 3:22pm

Chemistry
A weather balloon is inflated to a volume of 25.6L at a pressure of 736mmHg and a temperature of 31.9∘C. The balloon rises in the atmosphere to an altitude, where the pressure is 365mmHg and the temperature is -15.6∘C. Assuming the balloon can freely expand, ...
Sunday, February 22, 2015 at 3:22pm

chemistry
how do I calculate rate velocity using absorbence at 412/ min-1.
Sunday, February 22, 2015 at 3:15pm

physics/chemistry
how does one calculate the work done by a spherical bubble with radius r in a liquid with a surface tension of T. I understand for a cavity it is 8pi(r)T, would you just double it to get 16pi(r)T because there are 2 films? here's the math....2(4pi((r)+dr)^2 -4pir^2) for a ...
Sunday, February 22, 2015 at 2:39pm

chemistry
when 8.28g of ethanol were heated with 60g of ethanioc acid 49.74 of acid remain at equilibrium calcuma the value of k
Sunday, February 22, 2015 at 10:38am

Chemistry
When 80.0 mL of HCl is added to 80.0 mL of NH3OH, the temperature increases 2.5 celsius. Assuming the final solution has the same specific heat capacity as liquid water, the heat produced in the reaction between two solutions is: I dont get how to find the moles and mass
Sunday, February 22, 2015 at 2:32am

Chemistry
A student added some bromine (reddish orange) in some carbon tertrachloride to a sample of butane in a test tube and placed it in a dark cupboard. When the student removed the test tube it still had the reddish orange colour. When the test tube was left on the table top it was...
Saturday, February 21, 2015 at 11:41pm

Chemistry
A solution is prepared by dissolving 25.0 g of pure HC2H3O2 and 25.0 g of NaC2H3O2 in 700 mL of solution (the final volume). (a) What is the pH of the solution? (b) What would the pH of the solution be if 65.0 mL of 0.650 M NaOH were added? (c) What would the pH be if 40.0 mL ...
Saturday, February 21, 2015 at 11:32pm

chemistry
PLZ help me understand the way of solving this equation quick A 0.07 mol sample of octane C8H18 absorbed 3.5*10^3 j of energy. calculate the temperature increase of octane if the molar heat capacity of octane is 254.0 j/k*mol
Saturday, February 21, 2015 at 10:57pm

chemistry
A student added some bromine (reddish orange) in some carbon tertra chloride ro a sample of butane in a test tube and placed it in a dark cupboard. When the student removed the test tube it still had the reddish orange colour. When the test tube was left on the table top it ...
Saturday, February 21, 2015 at 5:43pm

General Chemistry HELP!
Research and describe one current application of the knowledge of the atom. This application can be in any field of your choice. This means the field can be scientific, such as medicine, or nonscientific, such as entertainment. The purpose of this assignment is to learn the ...
Saturday, February 21, 2015 at 5:37pm

chemistry
Consider the following equation, which represents the combustion of hydrogen sulfide. 2H2S(g)+3O2(g)¨2SO2(g)+2H2O(g)​ What volume, in liters, of SO2 is formed when 120L of H2S(g) is burned? Assume that both gases are measured under the same conditions.
Saturday, February 21, 2015 at 4:56pm

chemistry
A dry ethene exerted a pressure of 680mmhg at 17degree celcius.what pressure would be exerted if the sample is collected over water at 17degree celcius? (s.v.p at 17degree celcius=14.0mmhg)
Saturday, February 21, 2015 at 4:52pm

chemistry
Put the following compounds in order of INCREASING oxidation number of N: N2H4, NO3-1, N2, NH3 ?
Saturday, February 21, 2015 at 4:05pm

Chemistry
(For fischer esterification) If you had collected the forerun from your distillation and tested it in the gas chromatograph, what would the most predominant compound be? -Isopentyl alcohol -Isopentyl acetate -Water -acetic acid
Saturday, February 21, 2015 at 3:25pm

chemistry
how many CO would be needed to reduce 19.1 grams of iron (III).
Saturday, February 21, 2015 at 3:16pm

Chemistry
To what volume should you dilute 124mL of an 8.10M CuCl2 solution so that 49.0mL of the diluted solution contains 4.81g CuCl2? Molar Mass of CuCl2= 134.45 g/mol Convert: 4.81g * (1mol/ 13.45g CuCl2)= 0.0358mol CuCl2 [CuCl2]= M= mol/L= (0.0358mol/ 49ml) * (1000mL/1L)= 0.7306M ...
Saturday, February 21, 2015 at 10:17am

chemistry
could one separate the components of a mixture of PbCl2 and Mg(OH)2 using only cold water?
Saturday, February 21, 2015 at 6:26am

chemistry
Two moles of an ideal gas initially at 27C and 1 atm pressure are compressed isothermally and reversibly till the final pressure of the gas is 10 atm. Calculate the work done. (R=8.314 JK-1mol-1)
Saturday, February 21, 2015 at 12:16am

Chemistry
1.Calculate the amount(in mol) in 8.80 g of carbon dioxide,Co2 2.Calculate the number of chlorine atoms in a 6.0 mg sample of anti-cancer drug cisplatin, cis-diamminedichloroplatinium(II),Pt(NH3​)2Cl2
Friday, February 20, 2015 at 11:03pm

Chemistry AP
Hey Bob, What is the pH at the point during a titration when 20 mL of 0.200 M HCl has been added to 30 mL of 0.0500 M NH3 solution? HCl is strong acid, Kb = 1.8 × 10−5 for NH3. Answer in units of pH. I've gone about getting the mmol of HCl and NH3, getting ...
Friday, February 20, 2015 at 10:30pm

Chemistry
It's January in Nashville and your local weather station just informed you that the temperature outside is -4.37 degrees Celcius. You estimate the amount of ice on your driveway to be approximately 30kg. What is the minimum amount of sodium chloride in kilograms (kg) ...
Friday, February 20, 2015 at 10:19pm

Chemistry
100 ml graduated cylinder containing 50 ml of water, drop 100g piece of brass into the water what height does the water rise in the graduated cylinder?
Friday, February 20, 2015 at 8:17pm

Chemistry
An automobile tire has a maximum rating of 38.0 psi (gauge pressure). The tire is inflated (while cold) to a volume of 11.8 Liters and a gauge pressure of 36.0 psi at a temperature of 12.0 Celsius. While driving on a hot day, the tire warms to 65.0 Celsius and it's volume ...
Friday, February 20, 2015 at 8:10pm

chemistry
Al2(SO3)3 + 6NaOH ¨ 3Na2SO3 + 2Al(OH)3 If this reaction begins with 10 g Al2(SO3)3 and 10 g NaOH, what is the theoretical yield in grams Al(OH)3 and what is the limiting reactant?
Friday, February 20, 2015 at 6:14pm

chemistry
I have questions but I don't understand this passage. Could you give a summery? Here are the question 1. One problem the researchers faced was an uncertainty about whether the signals observed in certain mass spectrometry data were, in fact, due to lead isotopes. Explain ...
Friday, February 20, 2015 at 5:05pm

Chemistry
The balanced net ionic equation resulting from addition of aqueous hydrochloric acid to solid chromium(III) hydroxide is: A. Cr(OH)3 (s) + 3 HCl (aq) 3 H2O (l) + CrCl3 (aq) B. Cr(OH)3 (s) + 3 Cl- (aq) 3 OH- (l) + CrCl3 (aq) C. Cr(OH)3 (s) + 3 H+ (aq) + 3 Cl- (aq) 3 H2O (l) + ...
Friday, February 20, 2015 at 2:50pm

Chemistry
what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble gasses but I'...
Friday, February 20, 2015 at 2:13pm

chemistry
Describe how to prepare 1 L of a 0.5 M solution of cobalt chloride hexahydrate (CoCl2 6H2O). Be sure to identify the labware shown above (flask and a scale), explain your reasoning, and show any calculations.
Friday, February 20, 2015 at 2:03pm

Chemistry
Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O). Write a balanced equation for this reaction. Assuming that all volume measurements occur at the same temperature and pressure, how many liters of ...
Friday, February 20, 2015 at 1:50pm

chemistry
The Russian Mir space station used a chemical oxygen generator system to make oxygen for the crew. The system ignited a tube of solid lithium perchlorate (LiClO4) to make oxygen and lithium chloride (LiCl): LiClO4 (s)  2O2 (g) + LiCl (s) If you have 500 g of LiClO4, ...
Friday, February 20, 2015 at 1:48pm

Chemistry
Use this reaction for this question: 4NH3 (g) + 2O2 (g) 4NO (g) + 6H2 (g); H = -905 J. Which statement is true about the reaction above? A. G is negative at all temperatures. B. S is negative and G is positive. C. S is negative and G is negative. D. G is positive at all ...
Friday, February 20, 2015 at 1:26pm

Chemistry
What is a molecular dipole moment? A. A separation of charge characterizing a nonpolar covalent bond B. A separation of charge forming a positive and a negative end of a molecule C. The arrangement of charges around an atom in a nonpolar molecule D. A net cancellation of ...
Friday, February 20, 2015 at 12:27pm

organic chemistry
Provide a structure for the following compound: C9H10O3; IR: 2400–3200, 1700, 1630 cm–1; 1H NMR: δ 1.53 (3H, t, J = 8 Hz); δ 4.32 (2H, q, J = 8 Hz); δ 7.08, δ 8.13 (4H, pair of leaning doublets, J = 10 Hz); δ 10 (1H, broad, disappears with ...
Friday, February 20, 2015 at 9:17am

chemistry
chemical formulae for naphthalene and benzoic acid
Friday, February 20, 2015 at 3:12am

chemistry
In a constant-pressure calorimeter, 65.0 mL of 0.330 M Ba(OH)2 was added to 65.0 mL of 0.660 M HCl. The reaction caused the temperature of the solution to rise from 21.91 °C to 26.41 °C. If the solution has the same density and specific heat as water, what is ÄH ...
Friday, February 20, 2015 at 1:52am

Chemistry
what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble gasses but I'...
Friday, February 20, 2015 at 1:44am

chemistry
A particular photon has a wavelength of approximately 2 x 10-7m. What is the energy, in joules, associated with this photon? A. More information is needed. B. 4 x 10-32 C. 1 x 10-18 D. 1 x 1018 E. 1.5 x 1015
Friday, February 20, 2015 at 12:11am

chemistry
Given the following information about electronegativity, which binary compound would form covelant bonds with the greatest polarity? Element Electronegativity H 2.1 Li 1.0 S 2.5 Al 1.5 F 4.0 Cl 3.0 A. HCl B. LiF C. H2S D. AlH3
Thursday, February 19, 2015 at 9:56pm

Chemistry
A 100.0 g sample of ice at -15°C is heated until it is converted to water vapour at 120.0°C. Calculate the total energy change.
Thursday, February 19, 2015 at 9:22pm

Chemistry
In a coffee-cup calorimeter, 1.50 g of NH4NO3 is mixed with 72.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.65°C. Assuming the solution has a heat capacity of 4.18 J/°C&...
Thursday, February 19, 2015 at 9:07pm

Chemistry
"Find the total energy lost by the contents of a Styrofoam picnic cooler when a 3.60 kg block of ice placed inside the cooler completely melts (at 0 Celsius). The ice had an initial temperature of -10.00 Celsius." My ans are q1=72360J n q2=21672 q=94032J But one ...
Thursday, February 19, 2015 at 8:31pm

Chemistry
"Find the total energy lost by the contents of a Styrofoam picnic cooler when a 3.60 kg block of ice placed inside the cooler completely melts (at 0 Celsius). The ice had an initial temperature of -10.00 Celsius." I did this question and i got 73080J but I'm not ...
Thursday, February 19, 2015 at 7:09pm

Chemistry
Suppose a galvanic cell contains one nickel electrode and one copper electrode. At 25°C, nickel has a negative reduction potential and copper has a positive reduction potential. At which electrode will reduction occur? Explain. I believe the copper will be oxidized and the...
Thursday, February 19, 2015 at 6:20pm

chemistry
I have a lab finished and I have to find the dehydrated sample (show calculations) and the value of n (show calculations). I just need to know how I go about finding these answers using my data?
Thursday, February 19, 2015 at 4:48pm

Chemistry
An unknown gas sample is collected in a 255mL container at 25 C and 755 mmHg. How many moles of gas are present? show solution please so i can learn:D
Thursday, February 19, 2015 at 4:45pm

chemistry
Find the mass in grams of a 240 ml sample of dry air at a pressure of 750 mmHg and a temperature of 19 degrees celsius.
Thursday, February 19, 2015 at 4:44pm

chemistry
Epsom salts is magnesium sulfate heptahydrate. If a student takes 2.50 g of Epsom salts and heats it to drive off the water, how much mass should the student expect to lose? ( I know that hepta is 7 but that's still not making sense to me)
Thursday, February 19, 2015 at 4:39pm

chemistry
How many grams of water are required to completely hydrolyze 0.54 grams of lidocaine? What type of be equation should be used?
Thursday, February 19, 2015 at 4:11pm

organic chemistry
Provide a structure for the following compound: C9H10O3; IR: 2400–3200, 1700, 1630 cm–1; 1H NMR: δ 1.53 (3H, t, J = 8 Hz); δ 4.32 (2H, q, J = 8 Hz); δ 7.08, δ 8.13 (4H, pair of leaning doublets, J = 10 Hz); δ 10 (1H, broad, disappears with ...
Thursday, February 19, 2015 at 3:58pm

Chemistry
A balloon filled with 1.35 atm of dimethyl ether gas and 5.25 atm of oxygen gas at 27 °C has an initial volume 2.00L They react according to the following reaction: C2H6O (g) + 3 O2 (g) -> 2 CO2 (g) + 3 H2O (g) The system is allowed to back cool down to 27 °C ...
Thursday, February 19, 2015 at 3:16pm

Chemistry
Calculate the rms speed of Br2 molecules at 23 °C and 1.00 atm. What is the rms speed of Br2 at 23 °C and 1.50 atm?
Thursday, February 19, 2015 at 3:00pm

Chemistry
At standard temperature and pressure, a 1.00-mol sample of argon gas is vented into a 22.4-L rigid box that already contains 1.00 mol of nitrogen gas. We would expect the argon gas to:
Thursday, February 19, 2015 at 2:58pm

chemistry
Given the following information about electronegativity, which binary compound would form covelant bonds with the greatest polarity? Element Electronegativity H 2.1 Li 1.0 S 2.5 Al 1.5 F 4.0 Cl 3.0 A. HCl B. LiF C. H2S D. AlH3
Thursday, February 19, 2015 at 2:02pm

Chemistry
A 11.6 g sample of an unknown metal was heated to 100.0 oC and then added to 25.0 g of water at 23.0 degrees Celsius in an insulated calorimeter. At thermal equilibrium, the temperature of the water in the calorimeter was 24.8 degrees Celsius. What is the heat absorbed or lost...
Thursday, February 19, 2015 at 1:59pm

Chemistry
In an acid-base neutralization reaction 25 mL of 0.4 M NaOH reacts with 50.00 mL of H2SO4 solution. Calculate the concentration of the H2SO4 solution?
Thursday, February 19, 2015 at 11:44am

Chemistry
A reaction in which X and Y form products was found to be second order in X and first order in Y. By what factor will the rate of the reaction change if [X] is doubled and [Y] is tripled? a. 10 b. 12 c. 20 d. 2
Thursday, February 19, 2015 at 11:05am

chemistry
If I have 298 mL of a 0.8 M solution of NaBr, what will the concentration be if I add 425 mL of water?
Thursday, February 19, 2015 at 9:27am

Chemistry
Strong base is dissolved in 535 mL of 0.200 M weak acid (Ka = 3.16 × 10-5) to make a buffer with a pH of 4.04. Assume that the volume remains constant when the base is added. HA (aq)+ OH^-(aq) -> H2O(l) + A^-(aq) Calculate the pKa value of the acid and determine the ...
Thursday, February 19, 2015 at 4:19am

chemistry
An aqueous solution at 25 °C is 10.0% HNO3 by mass and has a density of 1.051 g/mL. What is the pH?
Thursday, February 19, 2015 at 2:15am

chemistry
(2*10^3g/8.165g)/(0.071cm^3/0.051cm^3)
Thursday, February 19, 2015 at 1:32am

Chemistry
Human bodies maintain their balance (homeostasis) through a series of equilibria. An important equilibrium involves calcium ion because Ca2+ is important for muscle contractions in the heart as well as for strong bones. Bone is a complex tissue consisting of living cells and ...
Thursday, February 19, 2015 at 12:50am

Chemistry
A 500.0 mL sample of saturated nickel(II) phosphate solution was analyzed spectrophotometrically and found to contain 1.88 × 10-5 g of nickel. (a) Determine the molarity of the nickel(II) phosphate solution. (b) Calculate the solubility product constant, Ksp for nickel(...
Thursday, February 19, 2015 at 12:49am

Chemistry
The solubility of insoluble substances changes depending on the nature of the solution. Below are two solutions in which Cu(OH)2 is dissolved; in each case, the solubility of Cu(OH)2 in those solutions is not the same as it is in pure water. (a) For each Cu(OH)2 solution below...
Thursday, February 19, 2015 at 12:49am

chemistry
If BH3 formed the trigonal planar molecule shown in the image below, which statement would best describe BH3? A. Boron does not contain a complete octet of electrons. B. BH3 would orient in an electric field. C. BH3 is a polar molecule. D. BH3 forms four bonds around the ...
Wednesday, February 18, 2015 at 11:00pm

chemistry
Consider a solution containing 0.47 M HOCl and 0.67 M NaOCl for the next two questions. The Ka for HOCl = 3.5E-8. What is the pH of this solution? Now calculate the pH of this solution after 0.15 mol of NaOH is added to 1.00 L of the solution. Assume that the volume does not ...
Wednesday, February 18, 2015 at 9:41pm

Chemistry
The reaction of NO and O2 produces NO2. 2 NO(g) + O2(g) „_ 2 NO2(g) The reaction is second-order with respect to NO(g) and first-order with respect to O2(g). At a given temperature, the rate constant, k, equals 4.7 x 10^2 M^¡V2s^¡V1. What is the rate of ...
Wednesday, February 18, 2015 at 8:57pm

Chemistry
For a certain reaction, the activation energy is 52.1 kJ/mole. By what ratio will the rate constant change if the temperature is decreased from 175C to 75C?
Wednesday, February 18, 2015 at 8:13pm

Quick chemistry help
What is the precipitate color for Na3PO4+CaCl2?
Wednesday, February 18, 2015 at 7:19pm

Chemistry
You want to determine the heat of reaction when a sodium chloride solution is formed using a 10.0 g sample of NaCl(s) and 50.0 mL of water in a coffee cup calorimeter. Which of the following equations would you use? Assume the specific heat of the solution is the same as the ...
Wednesday, February 18, 2015 at 4:20pm

chemistry
Calculate the specific rotation for Compound A, whose observed rotation was (+) 45.0 for a solution made from 0.400 g dissolved in 5 mL of chloroform solvent. The cell path length was 10 cm.
Wednesday, February 18, 2015 at 1:53pm

chemistry
Why is there a decrease in electron affinity going from lithium to sodium? A. There is a stronger nuclear charge, with no additional shielding electrons or number of shells. B. There are fewer spaces in the valence shell in which to place the added electron. C. The nucleus has...
Wednesday, February 18, 2015 at 1:38pm

chemistry
ho electrons are there in a silicon atoms?
Wednesday, February 18, 2015 at 12:39pm

chemistry
How many moles of water does it take to make 477g of lithium hydroixide
Wednesday, February 18, 2015 at 11:17am

Chemistry
Which is true of a balanced combustion reaction? Atoms are conserved. Mass is conserved. Both are correct. confused
Wednesday, February 18, 2015 at 11:08am

chemistry
How many Liters of H2 are produced if 3 liters of a 4M solution of H3PO4 decompose at 25oC and 1.05atm?
Wednesday, February 18, 2015 at 11:08am

Organic Chemistry
A 1.0 gram sample of aspirin will dissolve in 300 mL of water and in 17 mL of chloroform at 25 deg C. a. What is the solubility of aspirin in each solvent expressed in g/mL? (show your calculations) I don't know where to start, does the molecular weight come into play (180...
Tuesday, February 17, 2015 at 10:08pm

chemistry
In a 1L beaker, 203mL of 0.307 M ammonium chromate was mixed with 137mL of 0.269 M chromium(iii) nitrite. 3(NH4)2CrO4 + 2Cr(NO2)3 -> Cr2(CrO4)3 + 6NH4NO2 If the percent yield of the reaction was 88.0 %, what mass of solid product was isolated?
Tuesday, February 17, 2015 at 9:30pm

chemistry
In a 1L beaker, 203mL of 0.307 M ammonium chromate was mixed with 137mL of 0.269 M chromium(iii) nitrite. 3(NH4)2CrO4 + 2Cr(NO2)3 -> Cr2(CrO4)3 + 6NH4NO2 If the percent yield of the reaction was 88.0 %, what mass of solid product was isolated?
Tuesday, February 17, 2015 at 9:26pm

Chemistry
If all the H2O2 in 25mL of a 3% solution of H2O2 decomposed, calculate the diameter of a sphere that would contain the resulting O2 at 1 atm and 296K. I understand how to do the problem if I have moles but I am not sure how to get moles. I thought n=0.075moles because 3% ...
Tuesday, February 17, 2015 at 7:43pm

AP Chemistry
A student titrates 25.0 mL of a 0.100 M solution of acetic acid with a 0.100 solution of sodium hydroxide. Calculate the pH at the equivalence point.
Tuesday, February 17, 2015 at 7:30pm

chemistry
Why material properties vary in spite of the similarity in crystalline form?
Tuesday, February 17, 2015 at 5:28pm

chemistry
Predict if a precipitate will form when 20.00 mL of the 50% saturated solution is mixed with 20.00 mL of 0.0100M of the following solutions.? the saturated solution is : BaCO3, it has the Ksp of 5.1 x 10^-9 the solubility is 7.1 x 10^-5 M. I don't know how to do this. I am...
Tuesday, February 17, 2015 at 5:10pm

chemistry
Consider the reaction of 14.20ml of 0.141 M H3PO4 and 0.0521 M Ba(OH)2. 2H3PO4 + 3Ba(OH)2 ->Ba3(PO4)2 + 6HOH What volume of Ba(OH)2 is required to completely react with the H3PO4?
Tuesday, February 17, 2015 at 4:23pm

chemistry
Consider the reaction of 14.20ml of 0.141 M H3PO4 and 0.0521 M Ba(OH)2. 2H3PO4 + 3Ba(OH)2 ->Ba3(PO4)2 + 6HOH What volume of Ba(OH)2 is required to completely react with the H3PO4?
Tuesday, February 17, 2015 at 4:22pm

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