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July 24, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
Titration was used to determine the molarity of acetic acid in vinegar. A primary standard solution of KHP was used to standardize the NaOH. 1. When performing this experiment, impure KHP was used to standardize the NaOH solution. If the impurity is neither acidic or basic, ...
Friday, March 28, 2014 at 10:32pm

chemistry
Select only the True statements about buffer systems. Select all that are True. 1. Starting with NH3(aq) and adding a small amount of HCl(aq) will make a buffered solution. 2. The blood buffer, among other things, is supported by carbonic acid and its conjugate base ...
Friday, March 28, 2014 at 2:45pm

chemistry
Pleas does any one know how to calculate the number of isomers of an organic compound. Any formula pls
Friday, March 28, 2014 at 2:21pm

Chemistry
I got think I got the following questions almost figured, but I just want someone to make sure that I am correct. 1) The whole experiment involves using the ideal gas law to predict the molar mass of an unknown liquid. The formula is molar mass of liquid = gR(0.0821)T(...
Friday, March 28, 2014 at 1:42pm

chemistry
278.35g Ba3n2 to mole Ba3N2
Friday, March 28, 2014 at 1:19pm

logic and math
Calculate the truth value (f or V) a. Is it true that if (the Papaya is a fruit from the Caricaseas or the Pitahaya is the fruit of a plat from the Cactaseas) then (el Cohombro is a fruit of a plant from the family of the Cucurbitaceas or the Nisper is a fruit of a tree from ...
Friday, March 28, 2014 at 12:47pm

Chemistry
excess magnesium is reacted with 45 grams of sulfuric acid. 9.5 liters of hydrogen gas are collected understand conditions of temperature and pressure. what is the percentage of hydrogen sulfate and of water in the acod solution?
Friday, March 28, 2014 at 7:43am

chemistry
The density of 19.0% by mass of nitric acid, HNO3 is 1.11 g cm-3. Calculate the volume (dm3) of acid needed to prepare 2.00 dm3 of 3.00 mol dm-3 HNO3 solution. (FW HNO3 = 63 g/mol)
Friday, March 28, 2014 at 3:56am

Chemistry
I would really like to understand how to do these problems, because my exam is coming up in a few weeks. I still cannot comprehend how you can tell if a system is is positive or negative according to reaction. For #1, I presume it is E if it is spontaneous at all temperatures...
Friday, March 28, 2014 at 1:18am

CHEMISTRY
The mass of an erlenmeyer flask is 78.639g and the mass of the flask and water is 327.039. If the density of water is 1 g/ml then what is the true volume of the flask? so i had subtracted the mass of just the flask from the mass of the flask and the water and got 248.4. Would ...
Friday, March 28, 2014 at 1:01am

Chemistry
copper(1) chloride reacts with hydrogen sulfide. if 9.90 grams of copper(1) chloride and 10.2 grams of hydrogen sulfide are reacted together, what is the limiting reactant?
Thursday, March 27, 2014 at 10:13pm

chemistry
Upon decomposition, one sample of magnesium fluoride produced 1.65 kg{\rm kg} of magnesium and 2.58 kg{\rm kg} of fluorine. A second sample produced 1.50 kg{\rm kg} of magnesium. How much fluorine (in grams) did the second sample produce?
Thursday, March 27, 2014 at 9:20pm

Chemistry
a.) How much energy is emitted in each alpha decay of plutonium-234 if 234Pu, 234.0433mu and 230U, 230.0338mu. b.) The half-life of plutonium-234 is 8.8 hrs. How much heat is released by the alpha decay of a 1 micro-gram sample of plutonium-234 in a 24-hour period? For part a...
Thursday, March 27, 2014 at 6:47pm

Chemistry
The main radioisotope in a banana is potassium-40, a beta emitter with an activity of 242 Bq/g. An average medium banana has about 320 mg of potassium and the natural abundance of potassium-40 is .0117%. Calculate the value of the BED in a.) Gy b.) Sv Assume 5.02 nGy/Bq
Thursday, March 27, 2014 at 6:39pm

Chemistry URGENT
Could someone let me know if I have balanced these equations correctly. balanced equation of the reaction of iron and oxygen to produce iron(ii)oxide. 2Fe + O2 = 2FeO Also if the balanced equation of the reaction of iron and oxygen to produce iron(iii)oxide. 4Fe+302 = 2Fe2O3 ...
Thursday, March 27, 2014 at 6:29pm

Chemistry URGENT
I need help balancing a equation for the combustion of cellulose in oxygen to produce carbon dioxide and water vapor. C6H10O5 = 6CO +5H2O I know this is not correct but I don't know what else to do to get this to balance. Thanking you in advance.
Thursday, March 27, 2014 at 6:22pm

Chemistry
10.00 mL of an unknown base solution is titrated with .100 M HCl solution. The pH versus the volume of NaOH added is shown below. There is a graoh where there are two dotted lines signifying a pH: the highest at pH 6.31 and the lower at pH 3.92. What is the pOH pf the solution...
Thursday, March 27, 2014 at 5:58pm

Chemistry
How many grams of C would be necessary to produce 790. grams of CaCO3 by the sequence of reactions shown below? Step 1: CaO + 3C → CaC2 + CO Step 2: CaC2 + N2 → CaCN2 + C Step 3: CaCN2 + 3H2O → CaCO3 + 2NH3
Thursday, March 27, 2014 at 5:27pm

Chemistry
Silver ion reacts with excess CN− to form a colorless complex ion, Ag(CN)−2, which has a formation constant Kf=3.0×1020. Calculate the concentration of Ag+ in a solution prepared by mixing equal volumes of 2.3×10−3M AgNO3 and 0.21M NaCN.
Thursday, March 27, 2014 at 4:47pm

Chemistry Help Please!!!
What initially forms as pale blue and pale green precipitates when NH3(aq) is added to [Cu(H2O)6]^2+ and [Ni(H2O)6]^2+ solutions, respectively?
Thursday, March 27, 2014 at 4:01pm

CHEMISTRY
HOW MANYMOLES OF SULFUR DIOXIDE CAN BE PRODUCED FROM 20.0G OF HYDROGEN SULFIDE?
Thursday, March 27, 2014 at 2:46pm

Chemistry
The measured potential of the following cell was 0.1776 volts: Pb|Pb2+(??M)||Pb2+(1.0M)|Pb Calculate the electrode potential of the unknown half-cell(anode). Not sure how to approach this, considering the molarity is unknown. There isn't a lot of space on the page for the ...
Thursday, March 27, 2014 at 12:26pm

chemistry
I do not understand how to right a balanced equation for the combustion of cellulose in oxygen to produce carbon dioxide and water vapor. I know that cellulose is C6H10O5 but I don't understand how to balance. Thanking you in advance for your help.
Thursday, March 27, 2014 at 11:51am

Chemistry
I am having a hard time figuring out how to write a balanced equation for the reaction of iron and oxygen to produce iron(II) oxide. I also need a balanced equation for the reaction of iron and oxygen to produce iron (III) oxide. I would appreciate any and all help. Thanking ...
Thursday, March 27, 2014 at 11:46am

chemistry
write a reaction that show solid copper (II) nitrate dissociating.
Thursday, March 27, 2014 at 9:32am

Chemistry
a balloon has a volume of 2.0 L at room temperature (27 degrees celsius). at what temperature would the balloon have a volume of 2.0L?
Thursday, March 27, 2014 at 7:55am

analytical chemistry
What volume (in liters) of 0.96 M KOH solution should be added to a 0.130 L solution containing 10.2 g of glutamic acid hydrochloride (Glu, FW=183.59; pKa1=2.23, pKa2 =4.42, pKa3=9.95) to get to pH 9.90?
Thursday, March 27, 2014 at 4:47am

chemistry
calculate the grams of solute neede to prepare 24 grams of a 13.5% by mass scurose (c12h22o11) solution
Thursday, March 27, 2014 at 2:39am

Chemistry
I would really like to understand how to do these problems, because my exam is coming up in a few weeks. I still cannot comprehend how you can tell if a system is is positive or negative according to reaction. For #1, I presume it is E if it is spontaneous at all temperatures...
Thursday, March 27, 2014 at 1:58am

Chemistry
How would you exactly start the first problem? My thermodynamic skills is a bit rusty. I am assuming I have to use ΔH°f under the given reaction..? But then..we barely covered ΔG° in class. Am I to use this equation, ΔG° = ΔH° - T ΔS&...
Thursday, March 27, 2014 at 1:31am

Chemistry
generic salt, AB3, has a molar mass of 333 g/mol and a solubility of 2.30 g/L at 25 °C. What is the Ksp of this salt at 25 °C?
Wednesday, March 26, 2014 at 10:53pm

Chemistry
A generic salt, AB, has a molar mass of 159 g/mol and a solubility of 3.20 g/L at 25 °C. What is the Ksp of this salt at 25 °C?
Wednesday, March 26, 2014 at 10:38pm

Chemistry
a 4.000grams sample of aluminum metal is added to a solution containing 5.000grams of dissolved iron chloride. the reaction results in the formation of aluminum chloride and metallic iron. when the reaction is complete, unreacted aluminum remains, and this unreacted aluminum ...
Wednesday, March 26, 2014 at 10:13pm

chemistry
A solution is made with 2.0 g of substance that cause the temperature of 75.0 g of water to decrease from 23.1 C to 18.7 C. The specific heat of water is 4.18 J/g C.
Wednesday, March 26, 2014 at 9:56pm

Chemistry
he Ksp of mercury(II) hydroxide, Hg(OH)2, is 3.60 × 10-26. Calculate the solubility of this compound in g/L. I came up with x=2.8*10^-13
Wednesday, March 26, 2014 at 9:44pm

Chemistry
What is the mass if solute dissolved in the indicated volume of each of the following solutions? (b) 4.25 L of 0.450 M KIO4g (c) 60.0 mL of 0.310 M ZnSO4g (d) 60.0 mL of 0.310 M Ni(NO3)2g
Wednesday, March 26, 2014 at 8:54pm

Chemistry
A hospital saline solution is analyzed to confirm its concentration. A 60.0 mL sample with a mass of 50.443 g is evaporated to dryness. (a) If the solid sodium chloride residue has a mass of 0.413 g, find the mass/mass percent concentration of the NaCl solution. % (b) Find the...
Wednesday, March 26, 2014 at 8:53pm

Chemistry
Vitamin K is involved in normal blood clotting. When 1.05 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 3.53 °C. The freezing point and Kf constant for camphor can be found here. Calculate the molar mass of ...
Wednesday, March 26, 2014 at 8:51pm

Chemistry
Given that the vapor pressure of water is 17.54 Torr at 20 °C, calculate the vapor-pressure lowering of aqueous solutions that are 1.90 m in (a) sucrose, C12H22O11, and (b) aluminum chloride. Assume 100% dissociation for electrolytes. I got .5799 Torr for sucrose, ...
Wednesday, March 26, 2014 at 8:49pm

Chemistry
Which of the following substances could be heated from 20°C to 100°C most quickly? Assume identical heat sources are used on all substances. Specific Heat (J/g degrees C) Gold: 0.1291 Platinum: 0.1326 Silver: 0.2350 Tin: 0.2274 Can you please explain how you figured it...
Wednesday, March 26, 2014 at 7:36pm

Chemistry
The principal quantum number, n, describes the energy level of a particular orbital as a function of the distance from the center of the nucleus. Additional quantum numbers exist to quantify the other characteristics of the electron. The angular momentum quantum number (ℓ...
Wednesday, March 26, 2014 at 6:35pm

english essay
* I need help writing research essay. The topic is to write about an issue or problem that you want to change. Well, I am mostly interested in Science, particularly Chemistry and Nature.
Wednesday, March 26, 2014 at 6:09pm

Chemistry
"Determine the volume of a 0.925M K2Cr2O7 solution required to completely react with 5.28g of Cu." My attempted method for solving was to convert the 5.28g of Cu to moles, find moles of K2Cr2O7 using the mole to mole ratio, and then use M=mol/L to solve for volume. ...
Wednesday, March 26, 2014 at 4:54pm

Chemistry
"Determine the volume of a 0.925M K2Cr2O7 solution required to completely react with 5.28g of Cu." My attempted method for solving was to convert the 5.28g of Cu to moles, find moles of K2Cr2O7 using the mole to mole ratio, and then use M=mol/L to solve for volume. ...
Wednesday, March 26, 2014 at 4:54pm

Chemistry
Complete ionic equation and net ionic equation for 2 K3PO4 + 3 Fe(NO3)2 --> 6 KNO3 + Fe3(PO4)2
Wednesday, March 26, 2014 at 4:09pm

Chemistry
CIE and NIE for 2 K3PO4 + 3 Fe(NO3)2 --> 6 KNO3 + Fe3(PO4)2
Wednesday, March 26, 2014 at 2:43pm

chemistry
a piece of metallic iron (10 moles) was dissolved in concentrated hydrochloric acid. the reaction formed iron (II) chloride and hydrogen gas. how many moles of iron (II) chloride were formed?
Wednesday, March 26, 2014 at 1:50pm

chemistry
URGENT!!! How many grams of sodium benzoate (NaC6H5CO2) must be added to 500 mL of 0.15 M benzoic acid (HC6H5CO2) to make a buffer solution with pH of 5.0? Assume no volume change upon sodium benzoate dissolution. Ka = 6.46 x 10-5 How would I go about this question?
Wednesday, March 26, 2014 at 1:29pm

Chemistry
Write the reactions that occur for the benzoic acid/sodium benzoate buffer when you react it with HNO3 and KOH. How would I go about writing it? Thanks.
Wednesday, March 26, 2014 at 1:20pm

Chemistry
How many milliliters of 0.242 M NaOH are required to exactly titrate 18.0 grams of H2C2O4?
Wednesday, March 26, 2014 at 1:06pm

CHemistry
SO2(g) + H2O(l)= H2SO(l) What mass of sulfur dioxide is needed to prepare 36.86 g of H2SO3(l)
Wednesday, March 26, 2014 at 11:54am

Chemistry
CIE and NIE for 2 K3PO4 + 3 Fe(NO3)2 = 6 KNO3 + Fe3(PO4)2
Wednesday, March 26, 2014 at 11:50am

chemistry
in an experiment, a 4.000grams sample of aluminum metal is added to a solution containing 5.000grams of dissolved iron chloride. the reaction results in the formation of aluminum chloride and metallic iron. when the reaction is complete, unreacted aluminum remains, and this ...
Wednesday, March 26, 2014 at 11:46am

Chemistry
Which nucleophile, when reacted with 1-bromopropane (CH3CH2CH2Br), would produce a thiol? OH- SH- I- -OCH3
Wednesday, March 26, 2014 at 11:15am

chemistry
Which nucleophile, when reacted with 1-bromopropane (CH3CH2CH2Br), would produce an ether? I- OH- -OCH3 SH-
Wednesday, March 26, 2014 at 11:14am

Chemistry
So my chem professor had a slide with a question that follows: If you combine 100 ml of 0.10 M HCl and 100 ml of 0.10 M NaOH, and find that the temperature goes up 0.67 degrees K  What is ΔH° for the reac/on: OH(aq)- + H+(aq)->H2O(l)(c H2O= 4.18 J/°C sg, ...
Wednesday, March 26, 2014 at 10:27am

Chemistry
Calcium can also be precipitated out of the solution by adding sodium phosphate (Na3PO4) to form solid calcium phosphate. A.) write a net ionic equation for this process B.)calculate the mass of this precipitate you would generate from treating 1.000 L of your unknown sample ...
Tuesday, March 25, 2014 at 11:45pm

chemistry
Based on your titration of the 150ppm standard solution of Ca2+ calculate the molarity of the EDTA solution we used, which is Ca2+ + EDTA4- ----> [CA(EDTA)]2-
Tuesday, March 25, 2014 at 11:41pm

chemistry
The rate constant of a first-order reaction is 4.25 x 10^-4 s^-1 at 350 Celsius. If the activation energy is 103 kJ/mol, calculate the temperature at which its rate constant is 8.75 x 10^-4 s^-1.
Tuesday, March 25, 2014 at 11:21pm

chemistry
please help! how do i find the molecular mass of C3H5O2 molecular mass of 292 g.
Tuesday, March 25, 2014 at 10:46pm

Chemistry
The degradation of CF3CH2F (an HFC) by OH radicals in the troposphere is first order in each reactant and has a rate constant of k=1.6×108M−1s−1 at 4∘C. If the tropospheric concentrations of OH and CF3CH2F are 8.1×105 and 6.3×108 molecules ...
Tuesday, March 25, 2014 at 10:03pm

Chemistry
The concentration of Ca2+ in a particular water supply is 5.7×10−3M. The concentration of bicarbonate ion, HCO−3, in the same water is 1.7×10−3M. What masses of Ca(OH)2 and Na2CO3 must be added to 5.6×107L of this water to reduce the level ...
Tuesday, March 25, 2014 at 10:00pm

chemistry
Question Part Points Submissions Used A swimming pool, 20.0 m ✕ 12.5 m, is filled with water to a depth of 3.85 m. If the initial temperature of the water is 18.9°C, how much heat must be added to the water to raise its temperature to 28.7°C? Assume that the ...
Tuesday, March 25, 2014 at 9:51pm

chemistry
enzoic acid is a weak monoprotic acid with Ka = 6.5×10-5 M. NaOH(s) was gradually added to 1.00 L of 8.66×10-2 M benzoic acid. 1. Calculate the pH of the solution before the addition of the base. 2. Calculate the pH of the solution after the addition of 5.20×...
Tuesday, March 25, 2014 at 9:14pm

chemistry
how many moles of H2O are produced when 5.00 mols of oxygen gas are used
Tuesday, March 25, 2014 at 8:02pm

chemistry
Consider a buffer solution consisting of CH3NH3Cl and CH3NH2. Which of the following statements are true concerning this solution? (Ka for CH3NH3+ = 2.3 x 10 -11). 1. A solution consisting of 0.1 M CH3NH3Cl and 0.1 M CH3NH2 would be a more effective buffer than one containing ...
Tuesday, March 25, 2014 at 7:30pm

chemistry help
what is lead (II) acetate + hydrogen sulphide --> Pb(C2H3O2)2 + H2S --> how do i figure it out?
Tuesday, March 25, 2014 at 7:13pm

Chemistry - Science (Dr. Bob222)
A student wanted to determine the amount of copper in a sample of copper ore. The student dissolved a 2.500 ± 0.001 g piece of copper ore in about 75 mL of nitric acid; then, a complexing agent was added. The student transferred this solution to a volumetric flask and ...
Tuesday, March 25, 2014 at 6:38pm

Chemistry - Science
A 6.70 g sample of a binary mixture of silver (I) nitrate and sodium nitrate is completely dissolved in water to make a solution. Aqueous barium chloride is then added to this solution in excess to form 3.60 g of silver chloride solid. What is the percent by mass of silver ...
Tuesday, March 25, 2014 at 6:28pm

chemistry
what is the chemical & word equation of sulfur dioxide + water i don't understand this, can someone please explain to me how to do this!!?
Tuesday, March 25, 2014 at 5:58pm

College Chemistry (DrBob222)
A solution of an unknown weak acid, HA, is titrated with 0.100 M NaOH solution. The equivalence point is achieved when 36.12 mL of NaOH have been added. After the equivalence point is reached, 18.06 mL of 0.100 M HCl are added to the solution and the pH at that point is found ...
Tuesday, March 25, 2014 at 5:31pm

College Gen.Chemistry
A student wanted to determine the amount of copper in a sample of copper ore. The student dissolved a 2.500 ± 0.001 g piece of copper ore in about 75 mL of nitric acid; then, a complexing agent was added. The student transferred this solution to a volumetric flask and ...
Tuesday, March 25, 2014 at 5:29pm

Chemistry
The equilibrium constant for the reaction of the weak base aniline is Kb = 4.3e-10. C6H5NH2 (aq) + H2O (l) --> C6H5NH3+ (aq) + OH- (aq). Calculate ΔG at 298 K when [C6H5NH2] = 0.250 M, [C6H5NH3+] = 1.0E-5 M, [OH-] = 0.000480 M i used the equations dG=dG^o - RTlnQ and ...
Tuesday, March 25, 2014 at 5:21pm

Chemistry
What volume in liters will be required to dissolve 60.9 grams of Mg(OH)2? Ksp = 1.8×10-11 After doing the math, i got 1.58e-4, but its not right, so i have no idea what to do now.
Tuesday, March 25, 2014 at 5:07pm

College Chemistry (DrBob222)
You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?
Tuesday, March 25, 2014 at 4:52pm

College Gen. Chemistry - Science
You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?
Tuesday, March 25, 2014 at 4:47pm

chemistry
How ml silver nitrate solution (0.05 mol / l) K = 1.0000 consumed for titration of sodium chloride, 0.0500 g. MW Sodium chloride 58.44.
Tuesday, March 25, 2014 at 2:37pm

chemistry
How do I determine how many moles of KMnO4 it takes to neutralize C2O4-?
Tuesday, March 25, 2014 at 2:17pm

Chemistry
10.1g of potassium nitrate were dissolved in 50cm^3 of water. the temperature fell by 16 degrees celsius. Determine (a) the number of moles of potassium nitrate dissolve in 50cm^3 of water. (b) heat change that would be produced if one mole of potassium Nitrate dissolve ...
Tuesday, March 25, 2014 at 11:51am

Chemistry
What can be said about the presence of each of these groups of cations in the orginial solution
Tuesday, March 25, 2014 at 10:48am

Chemistry 2
CALCULATE THE SOLUBILITY OF CuBr in 0.69 M NH3
Tuesday, March 25, 2014 at 10:24am

Chemistry 2
What is the solubility of silver chromate in pure water
Tuesday, March 25, 2014 at 10:10am

Chemistry
The Ksp of manganese (II) hydroxide, Mn(OH)2 is 2.00x10^-13. Calculate the solubility of this compound in g/L?
Tuesday, March 25, 2014 at 9:59am

Chemistry
if the pressure read by the barometer is 0.882atm, what is the height of the column of mercury in cm?
Tuesday, March 25, 2014 at 3:26am

Chemistry
I don't really understand how to do this problem, or where to start exactly. Can someone explain to me where to start and how I can solve the problem in a step by step process? Thank you in advance! 1. An acetic acid / sodium acetate buffer solution is also 0.020 M AlCl3. ...
Tuesday, March 25, 2014 at 12:37am

Chemistry
Can someone show and explain to me step by step how to do the problems? I feel like I am doing it incorrectly. a) The solubility of PbI2 is 3.67 mg per mL. What is the Ksp? b) Three drops of 0.20 M potassium iodide are added to 100.0 mL of 0.010 M lead nitrate. Will a ...
Tuesday, March 25, 2014 at 12:33am

Chemistry
Mohr's indicator is 5g/100ml of K2CrO4 in water. What is the concentration of CrO4^2- in the indicator? (in mol/L)
Tuesday, March 25, 2014 at 12:20am

chemistry
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 2.50 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 6.43 °C. ...
Tuesday, March 25, 2014 at 12:14am

Chemistry
A 3.0g sample of NaCl is added to a Styrofoam cup of water, and the change in water temperature is 6.5∘C . The heat of solution of NaCl is 3.76 kJ/mol. What is the mass (in g) of water in the Styrofoam cup?
Monday, March 24, 2014 at 10:50pm

Chemistry
Acetylene(C2H2) torches are used in welding. How much heat (in kJ) evolves when 2.0L of C2H2 (d=1.0967kg/m3) is mixed with a stoichiometric amount of oxygen gas? The combustion reaction is C2H2(g)+52O2(g)→2CO2(g)+H2O(l), ΔH∘=−1299.5kJ
Monday, March 24, 2014 at 10:49pm

Chemistry
3.25g of zinc was added to 50cm^3 of a 4.0 molar dm^-3 HCl. When the reaction was completed the temperature rose by 28 degrees celcius. (a) Is the reaction exothermic or endothermic? (b)All the zinc dissolve in this reaction. How many moles of zinc reacted? (c) How many moles ...
Monday, March 24, 2014 at 9:20pm

chemistry
how much heat is required when 6.00g of water is melted at its melting point
Monday, March 24, 2014 at 5:15pm

chemistry
Calculate the resulting pressure if 4.50 liters of nitrogen at 35 degrees Celsius and 790 torr and 3.7 liters of oxygen at 15 degrees Celsius and 750 torr are pumped into a 1.00 liters container at 25 degrees celsius. Assume ideal gas behavior.
Monday, March 24, 2014 at 4:27pm

Chemistry: Check my answers?
Write “yes” or “no” below if the chemical equation is balanced or not. 1. 2H2 + O2 ---> 2H2O 2. S8 + 12O2 ---> 8SO3 3. HgO ---> Hg + O2 4. Zn + HCl ---> ZnCl2 + H2 5. 2Na + 2H2O ---> 2NaOH + H2 6. 2Al + 3FeO ---> Al2O3 + 3Fe 7. 4Si2H3 + ...
Monday, March 24, 2014 at 1:55pm

chemistry
Distilled water normally contains dissolved CO2. When preparing NaOH standard solutions, it is important to use CO2 free distilled water. How does dissolved CO2 in distilled water affect the accuracy of the determination of a NaOH solution’s concentration?
Monday, March 24, 2014 at 1:36pm

Chemistry
What is the molarity of a 5.00 x 102 ml solution containing 2490 g of KI? How many moles of LiF would be required to produce a 2.5 M solution with a volume of 10.5 L? How many grams of NaI would be used to produce a 2.0 M solution with a volume of 10.00 L? Very confused on ...
Monday, March 24, 2014 at 12:19pm

Chemistry
Arsenic acid (H3AsO4) is a triprotic acid with Ka1 = 5 ✕ 10-3, Ka2 = 8 ✕ 10-8, and Ka3 = 6 ✕ 10-10. Calculate [H+], [OH ‾ ], [H3AsO4], [H2AsO4‾ ], [HAsO42 ‾ ], and [AsO43 ‾ ] in a 0.16 M arsenic acid solution.
Monday, March 24, 2014 at 10:42am

Chemistry
Your muscles are switched on by releasing calcium ion from the sarcoplasmic reticulum that surrounds your muscle bundles. The Ca2+ binds to a muscle fiber, and that triggers the contraction. To relax the muscle again, Ca2+ must be pumped out, so that the concentration in...
Monday, March 24, 2014 at 8:24am

chemistry
Distilled water normally contains dissolved CO2. When preparing NaOH standard solutions, it is important to use CO2 free distilled water. How does dissolved CO2 in distilled water affect the accuracy of the determination of a NaOH solution’s concentration? would it be too...
Monday, March 24, 2014 at 7:51am

chemistry
2. When preparing a NaOH solution, a student did not allow the NaOH pellets to completely dissolve before standardizing the solution with KHP. However, by the time the student refilled the buret with NaOH to titrate the acetic acid, the remaining NaOH pellets had ...
Monday, March 24, 2014 at 7:50am

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