Saturday
December 10, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
What will happen if 2NaCl+CaCO3+SiO2 heated at 1200°C till it turns into liquid form.
Saturday, May 7, 2016 by Ashvin

Chemistry
0.75 L of a 48.5 %V/V methanol solution is diluted to make 5.60 L of solution. What is the final concentration of this solution?
Saturday, May 7, 2016 by JavaCompiler

Chemistry
How would one work through this problem? -Calculate the number of liters of 1.25M solution that can be made from 6.400g of barium nitrate. - I know that it's just stoichiometry, but I'm confused. The formula for molarity is the number of moles of the solute divided by ...
Saturday, May 7, 2016 by Charlie

Chemistry
At 25 °C, an aqueous solution has an equilibrium concentration of 0.00147 M for a generic cation, A (aq), and 0.000735 M for a generic anion, B2–(aq). What is the equilibrium constant, Ksp, of the generic salt A2B(s)?
Friday, May 6, 2016 by Jordan

chemistry
How many milliters of a 6.ooM HCl solution are required to react with 21.0 grams of Mg? I'm so confused. I know how to get the Molar mass of Mg and HCl but, does that even matter here?
Friday, May 6, 2016 by christine

Chemistry
What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100 g of benzene by 0.47 degrees celsius? Kf= 5.12 C/m
Friday, May 6, 2016 by Matthew

chemistry
calculate the number of grams of Al2S3 which can be prepared by the reaction of 20g of Al and 30gm of sulphur. how much the non_limiting reactant in excess?
Friday, May 6, 2016 by Ahsan

chemistry
C3H8+5 o2 - 3CO2 +4H2O the reaction If I have 56.7 liters of o2 reacted, how many liters of H2O were produced?
Friday, May 6, 2016 by kia

chemistry
calculate the number of moles of Mg in 0.12g(relative mass of Mg=24)
Thursday, May 5, 2016 by jan

Chemistry
DrBobb22 Calcule the concentrations of Cd^+2 , [Cd(CN)4^-2] and CN^- at equilibrium, when 0.42 moles of Cd(NO3)2 dissolves in 1 L of 2.50 M NaCN Kf for Cd(CN)4^-2 is 7.1x10^16
Thursday, May 5, 2016 by David

Chemistry
DrBobb22 Calcule the concentrations of Cd^+2 , [Cd(CN)4^-2] and CN^- at equilibrium, when 0.42 moles of Cd(NO3)2 dissolves in 1 L of 2.50 M NaCN Kf for Cd(CN)4^-2 Help!
Thursday, May 5, 2016 by David

Chemistry
Calculate the concentrations of Cd+2 , Cd(CN)4^-2 and CN at equilibrium when dissolvs 0.42 moles of Cd(NO3)2 (2.50 mol/L) Kf for Cd(NO3)2 = 7,1x10^16.
Thursday, May 5, 2016 by David

chemistry
im having trouble understanding this hw question, okay here's the question: A 0.326 8-g unknown containing Pb(CH3CHOHCO2)2 (lead lactate, FM 385.3) plus inert material was electrolyzed to produce 0.111 1 g of PbO2 (FM 239.2). Was the PbO2 deposited at the anode or at the ...
Thursday, May 5, 2016 by Anonymous

Chemistry
What volume in ml of 0.500 M silver nitrate is required to completely react with 25.0 ml of 1.5 M calcium chloride?
Thursday, May 5, 2016 by David

chemistry
35.0 mL of an aqueous solution of HNO3 of unknown concentration is titrated with a standard solution made up of 0.453 m NaOH
Thursday, May 5, 2016 by diala toulany

chemistry
calculate the poh of 1 dm^3 of naoh solution containing 4 g of sodium hydroxide
Thursday, May 5, 2016 by Anonymous

Chemistry
What is the maximum mass(g) of KCL that can be added to 1.00L of a 0.0100 M lead(ii) chloride solution without causing any precipitation of PbCl2? Assume the additional KCl does not affect the volume of the solution. For, PbCl2, Ksp=1.6x10^-5 Personally I'm at a loss here...
Thursday, May 5, 2016 by Alex

chemistry
Problem 3 A publication this year in the journal Yeast (who’d have thought!) by a Scottish group described their development of a spectrometric procedure to monitor the concentration of glucose, ethanol, biomass, and protein content in a vat during the production of Baker...
Thursday, May 5, 2016 by asery

Chemistry
An indicator is what type of compound? a. reducing agent b. oxidizing agent c. weak base or acid d. strong base or acid
Wednesday, May 4, 2016 by benji

Chemistry
What amount of ammonium sulfate is produced by the reaction of 8.48g of ammonia with 24.50g sulfuric acid?
Wednesday, May 4, 2016 by benji

Chemistry
3 x 10^23 molecules of element Z have a mass of 38 g. What is the mass of 1 mole?
Wednesday, May 4, 2016 by Monica

Chemistry
What is the oxidation state of chromium in cr2o7^-2
Wednesday, May 4, 2016 by Julia

Chemistry
What is the pH of a solution prepared by mixing 50.0 mL of 0.010 mol/L HCl(aq) and 50.0 mL of 0.010 mol/L Ca(OH)2(aq)? Assume the temperature is 25 degrees Celsius. Additional information given: Kw = 1.0×10^−14 at 25 degrees Celsius. The possible answers are: A) 2....
Wednesday, May 4, 2016 by allie

health science chemistry
How many ml of water should be added to 20.0 ml of a stock of 12.0 M HCl solution to make 1.50 M HCl ?assume that the volumes are additive.
Wednesday, May 4, 2016 by konja

Chemistry
If an ideal gas write the balances equation for the combination of magnesium and oxygen to form magnesium oxide, MgO.
Wednesday, May 4, 2016 by Jaila

Chemistry
Complete and balance the precipitation reaction. Include physical states in your answer. CuCI2(aq)+Na2CO3(aq)
Wednesday, May 4, 2016 by Tiara

Chemistry
Calculate the ph of a solution that is 0.157m HCI?
Wednesday, May 4, 2016 by James

Chemistry
How many grams of solute are present in 795 ml of 0.130m KBr?
Wednesday, May 4, 2016 by Ray

Chemistry
A mixture of He, Ne. And Ar has pressure of 16.1 atm at 28.0c. If the partial pressure of He is 3.05 atm and that of Ar is 1.16 atm, what is the partial pressure of Ne?
Wednesday, May 4, 2016 by Ciara

chemistry
The gas in a fixed container was at STP before is was lifted by a balloon into the atmosphere. What would the new pressure be in kPa if the temperature at a higher altitude was 268 K? a .00138 kPa b 103 kPa c 99.4 kPa d .982 kPa
Wednesday, May 4, 2016 by tristan

Chemistry
addition of conc H2SO4 to Ph-CH(CH3)OH gives product?????
Wednesday, May 4, 2016 by Edward

chemistry
The 4.000g sample of M2S3 is converted to MO2 and loses 0.277g.what is the atomic weight of M?
Wednesday, May 4, 2016 by Chansa

chemistry
The active ingredients of an antacid tablet contained only magnesium hydroxide and aluminium hydroxide. Complete neutralization of a sample of the active ingredients required 48.5 ML of 0.187 M hydrochloric acid. The chloride salts from this neutralization were obtained by ...
Wednesday, May 4, 2016 by Chansa

chemistry
Two different chloride compounds of platinum are known, compound X and Y. When 3.45g of compound X is heated, 2.72g of compound Y is formed to 1.99g of platinum metal and some more chlorine gas. Determine the formulas of compounds X and Y.
Wednesday, May 4, 2016 by Chansa

chemistry
A 5.000 gram sanple of dry mixture of potassium hydroxide, potassium carbonate and potassium chloride is reacted with 0.100L of 22.0 degrees Celsius and 740.0 torr,is obtained from this reaction. What was the percentage of potassium carbonate in the mixture?
Wednesday, May 4, 2016 by Chansa

chemistry
A 2.077g sample of an element which has an atomic mass between 40 and 55 reacts with oxygen to form 3.708g of an oxide. Determine the formula mass of oxide ( and identify the element)
Wednesday, May 4, 2016 by Chansa

Chemistry
Atmospheric pressure on the peak of Mount Everest can be as low as 0.20 atm. If the volume of an oxygen tank is 10.0 L, at what pressure must the tank be filled so that the gas inside would occupy a volume of 1.2x10^3L at this pressure? Tried using the P1V1 = P2V2 formula and ...
Wednesday, May 4, 2016 by Gale

chemistry
For the reaction below,when the reaction when 0.5000g of X13 reacts completely, 0.2360g of XC13 is obtained. Calculate the atomic weight of element Xmas and identify it 2X13 + 3C12--->2C13+312
Wednesday, May 4, 2016 by Chansa

chemistry
0.197g of magnesium is burned in air 2Mg + O2 ---> 2MgO However, some of the magnesium reacts with nitrogen in the air to form Magnesium nitride instead : 3Mg + N2 --->Mg3N2 So you have a mixture of MgO and Mg3N2 weighing 0.315g.Determine what percentage of the Mg formed...
Wednesday, May 4, 2016 by Chansa

chemistry
when the supply of oxygen is limited, iron metal reacts with oxygen to produce a mixture of FeO and Fe203.in a certain experiment, 20.00g of iron metal was reacted with 11.20g of oxygen gas. After the experiment the iron was totally consumed and 3.56g oxygen gas remained. ...
Wednesday, May 4, 2016 by Chansa

chemistry
1. A 12.5843g sample of zrbr4 was dissolved and after several steps all of the combined bromine was precipitated as ArBr. The silver content of AgBr was found to be 13.12160g Assume the atomic masses of silver and bromine to be 107.868 and 79.904.what value was obtained for ...
Wednesday, May 4, 2016 by Chansa

chemistry
A salt contains only barium and one of halides ions. A 0.1480g sample of the salt was dissolved in water and an water and an excess of sulfuric acid was added to form barium sulfate which was filtered, dried and weighed its mass was found to be 0.1660g.what is the formula for ...
Wednesday, May 4, 2016 by Chansa

chemistry
if an ideal gas has a pressure 2.47 atm, a temperature 86.78C and has a volume of 23.83L how many moles are in the sample
Wednesday, May 4, 2016 by Jessica

Chemistry
What is the equilibrium constant in the following reaction [C][O2]/[CO2] [CO2]/[C][O2] [C]^2[O2]^2/[CO2]^2 [CO2]^2/[C]^2[O2]^2
Wednesday, May 4, 2016 by Jordan

Chemistry
In an endothermic reaction at equilibrium, what is the effect of raising the temperature? The reaction makes more products the reaction makes more reactants*** the reaction is unchanged the answer cannot be determined
Wednesday, May 4, 2016 by Jordan

Chemistry
Consider the reaction N2(g)+3H2<-->2NH3(g). What is the effect of decreasing the volume on the contained gases The reaction shifts toward the product gas The system reacts by increasing the number of gas molecules*** the pressure on the gases decreases momentarily ...
Wednesday, May 4, 2016 by Jordan

Chemistry
If sulfur dioxide and oxygen can be made into sulfur troxide, what is the reverse reaction? 2SO3-->2SO2+O2*** SO3+O2-->SO5 2SO2+O2-->2SO3 SO3+2SO3-->3S+4O2
Wednesday, May 4, 2016 by Jordan

Chemistry
At equilibrium, what is the rate of production of reactants compared with the rate of the production of products? much higher higher*** the same lower
Wednesday, May 4, 2016 by Jordan

chemistry
the density of an aqueous solution containing 10.0% by mass ethanol is 0.984 g/ml. calculate molality and molarity. what volume of the solution would contain 1.15 g ethanol ?
Wednesday, May 4, 2016 by jerry

Chemistry
how many ml of 0.200m NAOH solution contain 2.00g NaOH(MW =40.00
Wednesday, May 4, 2016 by Tapiwa

chemistry
calculate the ph of a solution that is 0.111 M HCI(strong solution)
Wednesday, May 4, 2016 by Mara

chemistry
60 gram of urea is dissolved in 250ml. Calculate the molarity
Wednesday, May 4, 2016 by ankita Kashyap

chemistry
A standard addition method is used to determine the concentration of ethanol in an unknown sample. Six 10 mL aliquots of the unknown are drawn from the processing vat. An aqueous solution of ethanol is standardized to have 1.57 g/L. This standard is pipetted to five of the ...
Tuesday, May 3, 2016 by meeny

Chemistry
If 455-ml of 6.0 M HNO3 is used to make a 2.5 L dilution,what is the molarity of the dilution?
Tuesday, May 3, 2016 by Caleb

Chemistry
How many ethane will be burnt to produce 0.1moles of steam.
Tuesday, May 3, 2016 by Gravity

Chemistry
To neutralize 8.34 ml of HCl 36.5% by mass and density = 1, 2 g/cm3, the required volume of 5 mol/L NaOH will be?
Tuesday, May 3, 2016 by Monica

Chemistry
Iron and oxygen gas can react to form the magnetic oxide of iron Fe3O4. How many grams of Fe3O4 can be made from 42.3 g of Fe?
Tuesday, May 3, 2016 by Jenny

Chemistry-ish
What is the pH of a solution that has a OH- concentration equal to 1x10-5M? 14-x 14-5=9 can I use that simple of math 9?
Tuesday, May 3, 2016 by Jeremiah

Chemistry
Please check my work: What is the pOH of a solution containing [H+] = 1x10-11 M? log H=14-11 3 right
Tuesday, May 3, 2016 by Jeremiah

Chemistry
(Ammonium) NH^3 is classified as what technically? its not just an acid or a base is it? So would it be either depending on the circumstances?
Tuesday, May 3, 2016 by Jeremiah

Chemistry
Calculate value of Ksp for Ca(OH)2 (ΔG∘f(Ca2+)=-553.6 kJmol−1 , ΔG∘f(OH−)=-157.2 kJmol−1 , ΔG∘f(Ca(OH)2)=-898.5 kJmol−1 ).
Tuesday, May 3, 2016 by Ayaka

chemistry
If 17.5 mL of 0.553 M KOH is needed to neutralize 25.0 mL of an HBr solution what is the molarity od HBr solution
Tuesday, May 3, 2016 by rosie

Chemistry
What is the empirical formula of benzene, C6H6? I know how to find empirical formula; as long as you know the moles, you can find the ratio and thus the empirical formula. But the question provides nothing and I can only find the Mr? The answer from the answer booklet is CH. ...
Tuesday, May 3, 2016 by Winnie

Chemistry
A kettle contains 2kg of water at 20 degree celsius. What mass of methane must be burned to raise this quantity of water to 100 degree celsius?
Tuesday, May 3, 2016 by Cliff. WEITELI

chemistry
How many electrons are in the highest energy orbital of the element copper? There is 1 in the outermost shell but what about the highest energy orbital?
Tuesday, May 3, 2016 by Anonymous

Chemistry
what salt results from the neutralization of phosphoric acid with potassium hydroxide? would it be: 3NaOH + H3PO4 -> Na3PO4 + 3H20 OR H3PO4 + sKOH -> K3PO4 + 3 H2O
Tuesday, May 3, 2016 by Anonymous

Chemistry
what salt results from the neutralization of phosphoric acid with potassium hydroxide? would it be: 3NaOH + H3PO4 -> Na3PO4 + 3H20 OR H3PO4 + sKOH -> K3PO4 + 3 H2O
Tuesday, May 3, 2016 by Anonymous

Quantitative Chemistry
Which of the following statements about the reaction, 4 HCl(aq) + MnO2(s) MnCl2(aq) + 2 H2O(l) + 2 Cl2(g), is correct? a.)The manganese atoms are oxidized. b.)The oxygen atoms are reduced. c.) The chlorine atoms are both oxidized and reduced. d.)All of these statements are ...
Tuesday, May 3, 2016 by Neil

Chemistry
To neutralize 8.3 4 ml of HCl 36.5% by mass and density = 1, 2 g/cm3, the required volume of 5 mol/L NaOH will be?
Tuesday, May 3, 2016 by Monica

Chemistry
Mercury(II) sulfide, HgS, is practically insoluble in pure water. Its solubility at 25 degrees C is probably no more than 3×10^−25 g/L. Of the following quantities of pure water, which is the smallest quantity that could be used to make a saturated solution of HgS?
Monday, May 2, 2016 by Helena

Chemistry
Usinf your periodic table, Indicate whether each other following substances could act as an oxidizing agent (OA), a reducing agent (RA) or both (OA/RA): (A.) Ba2+ (aq) So I think it should be reduction because it gained 2 electrons? (B.) Co2+ (aq) : RA (C.) Se(s) : (D.) Cs(s...
Monday, May 2, 2016 by Anonymous

Chemistry
Suppose the osmotic pressure of blood at 37 °C is 7.65 atm and you are preparing an intravenous (IV) NaCl solution for a patient. What concentration (in M) of NaCl solution should you prepare so the resulting IV solution is isotonic with blood, if the van’t Hoff ...
Monday, May 2, 2016 by Lola

Chemistry
If .0162 moles of sodium sulfide is dissolved in 100.0 mL of water, what is the concentration of sodium ions [Na⁺] in solution?
Monday, May 2, 2016 by div

Chemistry
In a reaction vessel, 500. mL of 0.100 M Na3PO4(aq) is combined with 200. mL of 0.400 M Pb(NO3)2(aq). (a) Write the molecular equation for the reaction that occurs. Balance the equation using lowest whole numbers and be sure to include states. (b) Identify the limiting ...
Monday, May 2, 2016 by ya boy

chemistry
Balance this equation. If a coefficient of "1" is required, choose "blank" for that box. CH4 + O2 → CO2 + H2O
Monday, May 2, 2016 by derek

Chemistry
Consider the reaction: 2H2+2NO -> N2+2H2O. Initially 1.20mol of H2 and 0.95mol of NO are placed in a 2.50L container(all reactants and products are gases) if after 5seconds the amount of H2 has been reduced to 1.02mol. How much NO is left? And how much N2 and H2O has been ...
Monday, May 2, 2016 by Cali

chemistry
On heating 25g of a saturated solution to dryness at 60oc, 4g of anhydrous salt was recovered. Calculate its solubility in grams per 100g of solvent
Monday, May 2, 2016 by dare

Chemistry
How can I do an acrostic poem for the word REDOX?
Monday, May 2, 2016 by Michelle

chemistry
Which conducts better, BeCl MgCl2
Sunday, May 1, 2016 by Mary

Chemistry
A current of 10 amps passes for an hour through a solution of sodium chloride with a volume of 1L by poles of pt,calculate the pH of the solution after the electrolysis is finished.
Sunday, May 1, 2016 by Asmaa khalaf

chemistry
Hi, I posted this question earlier.. 100 g of water, H2O, is heated from 25C to 50C. What is the entropy change for the process? Cp = 4.2J/K·mol for water? I was told 100*4.2ln(323 K/ 298k) was the way to calculate it, it does not produce the correct answer.. I also ...
Sunday, May 1, 2016 by EBB

chemistry
the air in a 4.00L tank has pressure of 1.70atm what is the pressure in atmospheres 1L
Sunday, May 1, 2016 by linda

chemistry
HF hydrolyzes according to the following equation: HF(aq)+H2O(l)<-> H3O+(aq)+F-(aq) When 0.0300 mol of HF dissolves in 1.0 L of water, the solution quickly ionizes to reach equilibrium. At equilibrium, the remaining [HF]=0.0270 M. a.) How many moles of HF ionize per ...
Sunday, May 1, 2016 by alison

Chemistry
Suppose the osmotic pressure of blood at 37 °C is 7.65 atm and you are preparing an intravenous (IV) NaCl solution for a patient. What concentration (in M) of NaCl solution should you prepare so the resulting IV solution is isotonic with blood, if the van’t Hoff ...
Sunday, May 1, 2016 by Lola

Chemistry
In a laboratory, the following reaction is performed by combining 358 g of H2O and a sufficient amount of CaC2. The percent yield for this reaction is 94.5%. Calculate the actual yield of acetylene (C2H2) in grams from this reaction. CaC2 + 2H2O C2H2 + Ca(OH)2
Sunday, May 1, 2016 by Lori

Chemistry
How many mL of a 0.5M Ca(OH)2 solution are needed to neutralize 38 mL of a 2M HNO3 solution? ANSWER IS: x = multiply / = divide 38mL HNO3 X 1 L HNO3 x 2M HNO3 x 1 L Ca(OH)2 x 2M Ca(OH)2 x 1000 mL / 1000 mL/1L HNO3/..5mL Ca(OH)2/1M HNO3/1L = 304 mL Ca(OH)2
Sunday, May 1, 2016 by ChemistryAngel

Chemistry
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 endpoint was more than the 25-mL flask could hold. Note the titration must still be carried out in the flask. Be sure to include any ...
Sunday, May 1, 2016 by Audrey

Chemistry- polarity
Is 2,4-Hexadiyne-1,6-diol a polar or non-polar compound? I think it is non-polar, based on the the high retention factor (0.89) I got from the TLC.
Sunday, May 1, 2016 by Sally

chemistry
Calculate no: of moles of cl2 produced at equilibrium when 1 mole of pcl5 is heated in 10 DM vessel kc 0.041
Sunday, May 1, 2016 by jagna

chemistry
14. 100 g of water, H2O, is heated from 25C to 50C. What is the entropy change for the process? Cp = 4.2J/K·mol for water?
Sunday, May 1, 2016 by EBB

Chemistry
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 endpoint was more than the 25-mL flask could hold. Note the titration must still be carried out in the flask. Be sure to include any ...
Sunday, May 1, 2016 by Audrey

chemistry
What is the concentration of IO3- (total volume: 20mL) when you have .00001mol of HSO3- (total volume: 10mL)? Use the balanced equation IO3-(aq)+3HSO3-(aq)>>>I-(aq)+3S​O4^2-(aq)+3H+(aq)
Sunday, May 1, 2016 by jessica

chemistry
How to find the moles of IO3- reacted when you have .00001mol of 10mL HSO3-? Using the equation IO3-(aq)+3HSO3-(aq)>>>I-(aq)+3S​O4^2-(aq)+3H-(aq)
Sunday, May 1, 2016 by jessica

Chemistry
What are the number of molecules in 16g of h2co3??
Sunday, May 1, 2016 by Ravish

Chemistry
If i have 0.5 mole of hydrogen peroxide how many moles of oxygen would be produced assuming all of the hydrogen peroxide decomposes?
Sunday, May 1, 2016 by Kayla

Chemistry
A solution contains 14% by mass of h2so4.find the number of moles of h2so4 in 155g of solution
Sunday, May 1, 2016 by Sharad

Chemistry
Most fish need at least 4.00 ppm dissolved O2 for survival. (a) What is this concentration in M (assume the density of the solution is 1.00 g/mL)? (b) What partial pressure of O2 above the water is needed to obtain this concentration at 10. °C? The Henry’s law ...
Saturday, April 30, 2016 by Feufolia

chemistry
how do i figure out grams/tablet if I am in units of mol/L? >_>
Saturday, April 30, 2016 by Anonymous

Chemistry
If i have 0.5 mole of hydrogen peroxide how many moles of oxygen would be produced assuming all of the hydrogen peroxide decomposes?
Saturday, April 30, 2016 by Kayla

chemistry
How can i be accurate when assigning oxidation numbers? By this i refer to elements that have more than 1 oxidation # . For example: I have been working with hydrides and i had this reaction in mind: Nb + H Shoud i use 3 or 5 for Nb, why?
Saturday, April 30, 2016 by Melanie

  1. Pages:
  2. <<Prev
  3. 15
  4. 16
  5. 17
  6. 18
  7. 19
  8. 20
  9. 21
  10. 22
  11. 23
  12. 24
  13. 25
  14. 26
  15. 27
  16. 28
  17. 29
  18. Next>>

Homework Help: Science