Saturday
July 4, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry check my answers
Please check my answers For each of the 7 reactions in this experiment, write a balanced equation and classify it as a synthesis, decomposition, single replacemnt, neutralization, or double replacement reaction. Reaction 1 1)Adjust a burner flae to high heat 2)using crucible ...
Monday, May 25, 2015 by Kim

Chemistry check
H2O2+MnO2 -----> MnO2 + H2O Is my work correct?
Monday, May 25, 2015 by Rain

Chemistry
Using the balanced equation below, how many grams of cesium fluoride would be required to make 73.1 g of cesium xenon heptafluoride? CsF+XeF6 ---> CsXeF7
Monday, May 25, 2015 by Kylar

ap chemistry
a cell is based on the following reaction Fe(s)+2Fe+3(aq) -----> 3Fe+2 (aq) E cell= 1.18 V. Calculate the concentration of iron (II), in M, if the cell emf is 1.28 V. when [Fe^(3+)]= 0.5 M the answer is 0.047 M
Monday, May 25, 2015 by Anonymous

Chemistry
How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 111.0 mL of 0.36 M H2SO4?
Monday, May 25, 2015 by Dave

chemistry
how many grams of solid magnesium nitrate should be added to 5.0 grams of solid sodium nitrate in a 500 mL volumetric flask in order to produce an aqueous 0.25M solution of NO3- ions (once the flask is filled to the 500mL volume line)? No idea where to start for this question.
Monday, May 25, 2015 by alex

chemistry
15g of calcium hydroxide is dissolved in 500cm^3 of water 300cm^3 of the solution is used to neutralise hydrocloric acid of/5mol.dm^3 how do i calculate the volume of the acid
Monday, May 25, 2015 by happy

chemistry
How would this problem be worked using dimensional analysis? Answer is 1.32g and I can work it (.900/13.6) * 20 = 1.32 But i need it in dimensional analysis and the hint was to first find volume of mercury. How many grams of alcohol with a density of 0.900 g/cm3 will have the ...
Monday, May 25, 2015 by Rachel

Chemistry
Determine the pH of a buffer made from 250 ml of 0.50M HF and 150 ml of 0.75 M NaF.
Monday, May 25, 2015 by Amber

Chemistry ( I NEED HELP REAL QUICK )
How much Al is needed to react with 675 mL of 0.655M HCl solution according to the reaction => 2Al + 6HCl→2AlCl3+ 3H2 Help your friend!
Monday, May 25, 2015 by Farrell

Chemistry
Methane gas burns in air to give carbon dioxide and water. a) give a chemical equation b) How can the mixture of these gases be separated b) Which gases does it mean?? Can anyone tell me.. Pleease.
Monday, May 25, 2015 by Saurav

chemistry
Why does acetone evapourate faster than water in terms of intermolecular forces
Monday, May 25, 2015 by nicole

chemistry
why does water,oil,acetone and isopropanol have the same concave meniscus shape?
Monday, May 25, 2015 by nicole

Chemistry
A method to determine the chloride ion content of water involves precipitate the chloride ion as silver chloride using silver nitrate. Assuming that all the chloride ions in solution can be precipitated using silver nitrate, explain how this process might be performed and the ...
Sunday, May 24, 2015 by Anonymous

Chemistry
What volume of 1.45 H2SO4 is required to neutralize .050L of .75M KOH?
Sunday, May 24, 2015 by Stephanie

chemistry
A 2.500×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.3mL . The density of water at...
Sunday, May 24, 2015 by Jason

chemistry
A 2.500×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.3mL . The density of water at...
Sunday, May 24, 2015 by Jason

chemistry
career opportunities available in nursing. 2 companies /organizations in the area that offer jobs in this career??
Sunday, May 24, 2015 by reina bonilla

Chemistry
Does methane dissolve in water?
Sunday, May 24, 2015 by Saurav

Chemistry
Give the molecular formula for the following: 1)Methoxy methane 2) Methoxy Ethane 3) Ethoxy ethane
Sunday, May 24, 2015 by Gary

chemistry
how to separate the mixtures of methane gas and carbon dioxide
Saturday, May 23, 2015 by clive

chemistry
How do you separate oxygen and methane gases?
Saturday, May 23, 2015 by S.P

Chemistry
Explain the reaction that would occur in a galvanic cell between solutions of Al3+ and Pb2+. Identify the oxidation and reduction reactions and the location of each reaction. Then, use the standard reduction potential tables to determine the cell potential.
Friday, May 22, 2015 by Madison

chemistry
career opportunities available in nursing. 2 companies /organizations in the area that offer jobs in this career??
Friday, May 22, 2015 by reina bonilla

Chemistry
what is the freezing point of an aqueous solution that boils at 102.1 C? Kf=1.86 Kb=0.512 102.1-100.0=2.1 2.1/0.512=4.10 4.10*1.86=7.62 C 7.62 C Is this correct?
Friday, May 22, 2015 by lola

Chemistry
1. Suppose o2, n2 and Ar were placed at 1.00 atm and 273 K in closed containers. A tiny hole is opened in each container, allowing each gas to diffuse into another container filled with neon gas. What is the ratio of the rate of diffusion of nitrogen to the rate of diffusion ...
Friday, May 22, 2015 by casey

Chemistry
AP Chem ---- Which type of radiation is emitted when chromium 51 decays into manganese 51? Show the nuclear equation that explains it.
Friday, May 22, 2015 by Dani

Chemistry
AP Chem --- PbS + O2 = PbO + SO2 Balance the equation and write a short paragraph explaining the electron transfers that happen.
Friday, May 22, 2015 by Dani

Chemistry
AP Chem - Which element is oxidized in the following reaction: CuO(s) + H2 (g)  Cu(s) + H2O (l)
Friday, May 22, 2015 by Dani

Chemistry
Which salt would result from the acid-base reaction of phosphoric acid and potassium hydroxide? I already know I will have to write and equation and it with make water (H2O) and a salt. I think it starts like this... H3Po4 + KOH = K2HPO4 + H2O But I'm not sure what to do ...
Friday, May 22, 2015 by Dani

CHEMISTRY ( I NEED HELP AGAIN QUICK )
I've stuck with these two stoich questions A mixture is prepared by adding 20 ml of 0.200 M Na3PO4 to 30 ml of 0.150 Ca(NO3)2. What weight of calcium phospate will be formed? and last question would be, How many milliliters of 0.30 M NiCl2 solution are needed to react ...
Thursday, May 21, 2015 by FARRELL

Chemistry
A 100 g piece of ice (solid water) at 0 °C melted to liquid water at 75.5 °C. If all the heat came from propane (C3H8) combustion, how many grams of propane Molar mass is 44.1'
Thursday, May 21, 2015 by Brittani

Chemistry (I NEED HELP REAL QUICK)
how many moles of BaSO4 will form if 20.0 ml of 0.600 M BaC2 is mixed with 30.0 ml of 0.500 M MgSO4? Molarity = number of moles / litres
Thursday, May 21, 2015 by FARRELL

Chemistry
In 3-4 sentences, identify how the geometric structure of NF3 is different than that of NF4+. Explain how the geometry affects the ability of the molecules to experience a dipole effect. (I did the Lewis diagrams for both but I don't know what to do after that)
Thursday, May 21, 2015 by Madison

chemistry
career opportunities availiable in nursing. 2 companies /organizations in the area that offer jobs in this career?? what are some areas/concepts that are important for that career? is it solutions, reactions, stoichiometry??
Thursday, May 21, 2015 by reina bonilla

Chemistry
How many seconds does it take to deposit 81.5 g of Zn on a steel gate when 21.0 A is passed through a ZnSO4 solution?
Thursday, May 21, 2015 by JIm

Chemistry
Balance the reaction using half reactions under BASIC conditions: Al + CrO4^-2 ---> Al(OH)3 + Cr(OH)3 I tried to solve this question and ended up with this: Here are the two half equations Al ---> Al(OH)3 CrO4^-2 ---> Cr(OH)3 For Al ---> Al(OH)3, I did 3OH^- + 3H2O...
Thursday, May 21, 2015 by Sara

Chemistry
Reaction 6 1. Place a piece of mossy zinc in a test tube 2 add hydrochloric acid solution to the test tube until the mossy zinc is completely covered What gas was released in reaction 6 and how could you test the gas to confirm its identity?
Wednesday, May 20, 2015 by Rain

college chemistry
Calculate the pH of the cathode compartment for the following reaction given Ecell = 3.01 V when [Cr3+] = 0.15 M, [Al3+] = 0.30 M, and [Cr2O72-] = 0.55 M. 2 Al(s) + Cr2O72-(aq) + 14 H+(aq) → 2 Al3+(aq) + 2 Cr3+(aq) + 7 H2O(l)
Wednesday, May 20, 2015 by Anonymous

college chemistry
Consider only the species (at standard conditions) Na+, Cl-, Ag+, Ag, Zn++, Zn, Pb in ...? answering the following questions. Give reasons for your answers. a. Which is the strongest oxidizing agent? b. Which is the strongest reducing agent? c. Which species can be oxidized by...
Wednesday, May 20, 2015 by Anonymous

ap chemistry
What volume of H2(g) and O2(g) is produced by electrolyzing water at a current of 4.00 A for 12.0 minutes (assuming ideal conditions)?
Wednesday, May 20, 2015 by Anonymous

college chemistry
predict the order of reduction and which of the following ions will reduce first at the cathode of an electrolytic cell: Ag^(+), Zn^(+2), IO3^(-)?
Wednesday, May 20, 2015 by Anonymous

college chemistry
how many grams of copper can be reduced by applying a 3.00 A current for 16.2 minutes, to a solution containing Cu^(2+) ions?
Wednesday, May 20, 2015 by Anonymous

college chemistry
1. what voltage is necessary to force the following electrolysis reaction to occur? which process would occur at the anode? cathode? assuming the iodine oxidation takes place at a platinumm electrode, what is the direction of electron flow in this cell? 2I^(-)(aq)+Cu^(+2)(aq...
Wednesday, May 20, 2015 by Anonymous

Chemistry
At the start of the process 118 kg of isobutylbenzene is used and the overall yield of the 3 reaction steps is 24%, how many 400 mg tablets of ibuprofen will be produced? Isobutylbenzene: Chemical formula = C10H14 Molecular Weight = 134.22g 2-(4-isobuytlphenyl) propanoic acid ...
Wednesday, May 20, 2015 by Jessica

Chemistry
Choccamine and mintanol have Rf values of 0.81 and 0.21 respectively. What would the distance in centimetres (cm) between the two compounds be if the TLC was run on a TLC plate where the solvent front moved 8.9 cm from the baseline?
Wednesday, May 20, 2015 by Jessica

chemistry
Which of the following statements is true about the nucleus? Only the strong nuclear force holds the nucleus together. The strong nuclear force and the residual strong force hold the nucleus together. The presence of neutrons, the strong nuclear force, and the residual strong ...
Wednesday, May 20, 2015 by robstone

Chemistry
A 1.76g sample of quinone, C6H4O2, is burned in a calorimeter whose total heat capacity is 7.854 kJ/C. The temperature of the calorimeter increases from 23.44 C to 29.14 C. What is the heat of combustion per mole of quinone? The molar mass of quinone is 108.1 g/mol. The answer...
Wednesday, May 20, 2015 by Haley

chemistry
3g of a metal (iii) reacts with mercury (ii) chloride to form metal (iii) chloride and mercury (ii) iodide. Identify unknown metal product.
Wednesday, May 20, 2015 by Anonymous

Chemistry
a student puts 1.25 kg of ice in an ice cream maker with 350 g of rock salt. All the ice eventually becomes liquid water as the rock salt dissolves. Solve for the molality of the solution, then for its new freezing temperature.
Wednesday, May 20, 2015 by THATONEGUY

Chemistry
Name the product obtained on passing cabon(2) oxide into saturated potassium trioxocarbonate(4) solution.
Wednesday, May 20, 2015 by Yaseerah

Chemistry
Name the product formed when carbon two oxide is passed into potassium hydroxide solution.
Wednesday, May 20, 2015 by Yaseerah

Chemistry
Give a chemical test for carbon(2) oxide and illustrate your answer with chemical equation
Wednesday, May 20, 2015 by Yaseerah

Chemistry
When you drop an antacid tablet into water is it endothermic or exothermic? Please explain. Thank you.
Wednesday, May 20, 2015 by Help please

Chemistry
What happens when a burning candy is placed in a jar of carbon(iv) oxide?
Wednesday, May 20, 2015 by Yaseerah

CHEMISTRY
50 ML OF ACID AT 1.836 SPECFIC GRAVITY HOW MANY GRAMS OF ACID?
Wednesday, May 20, 2015 by KAT

chemistry
The density of 2 molal aqueous solution of NaOH is 1.10gm/L. Calculate the molarity of the solution.
Wednesday, May 20, 2015 by Neill

Chemistry
From the equation below, how many grams of barium sulfate can be produced from 20.8 g of barium chloride? BaCl2 + Na2SO4 -> BaSO4 + 2NaCl
Tuesday, May 19, 2015 by Sara

college chemistry
How did the change in concentration of the copper ions affect the cell potential? Is this change in agreement (qualitatively) with that which would be predicted by LeChatelier's Principle? explain.
Tuesday, May 19, 2015 by Anonymous

chemistry
A solution contains 2.0 × 10^–3 M Ba^2+ and 1.0 × 10^–2 M Sc^3+. A source of F^– is slowly added to the solution. Will BaF2 (Ksp = 1.84 × 10^–7) or ScF3 (Ksp = 5.81 × 10^–24) precipitate first? I believe that ScF3 would ...
Tuesday, May 19, 2015 by casey

collage chemistry
You spill 1500 mg of rubbing alcohol in a box that measures 4 m x 2m x 3m. If the entire sample evaporates into a gas, what is the concentration of the alcohol in milligrams per cubic meter?
Tuesday, May 19, 2015 by anne

Chemistry
When 2.05 moles of CH4 are mixed with 5.03 moles of O2 in the reaction below, the limiting reactant is CH4 + 2O2 -> CO2 + 2H2O
Tuesday, May 19, 2015 by Sara

Science (Chemistry)
So all I have to do now is cross multiply and solve for x right? Also when that happens, how do I factor the x^3? What do I do?
Tuesday, May 19, 2015 by Kibito

Science (Chemistry)
Hello DrBob222 Regarding the answer you gave me thank you very much. However when you expand the denominator, I don't get -0.14 but I get -0.28. I get that because when I first expand I get 0.0049 - 0.14x - 0.14x + 4x^2. So when I simplify that I get -0.28x. So could you ...
Tuesday, May 19, 2015 by Kibito

Chemistry
Balance the reaction using half reactions under BASIC conditions: Al + CrO4^-2 ---> Al(OH)3 + Cr(OH)3 I'm not sure how to do this question.
Tuesday, May 19, 2015 by Sara

Chemistry
A 360-mL sample of hydrogen is collected when the pressure is 800 mm Hg. What is the volume that the gas will occupy when the pressure is 720 mm Hg? 360/x=720/800 28800/720=720x/720 400-mL=x Am I correct?
Tuesday, May 19, 2015 by D

Chemistry
I need help on these last three problems on my Hw. 1. A 10.0 L sample of gas at 3.00 degrees Celsius is cooled at a constant pressure until it reaches 1/2 of its original volume. At what temperature in K will this volume be reached? (Charles law) 2. 994 mLof gas is collected ...
Tuesday, May 19, 2015 by Anonymous

chemistry
1. what would happen to the the cell potential in a voltaic cell if the salt bridge lost contact with one of the solutions? 2. would a reaction occur if solid tin was placed in a solution of copper II nitrate? If so, write the balanced net ionic equation for the reaction.
Tuesday, May 19, 2015 by Anonymous

college chemistry
the Cu(No3)2 solution was diluted to 0.001 M. The voltage was measured against standard zinc electrode and found to be 0.89 volts.. 1. write the cell reaction. 2. write the line notation for the reaction. 3. Use the nernst equation to calculate what the expected voltage should...
Tuesday, May 19, 2015 by Anonymous

Science (Chemistry)
A chemical system within a sealed 1 L reaction vessel is described by the following reversible reaction equation: 2H2S(g) <---> 2H(g) + S2(g) If the equilibrium constant is 0.000 004 200 at 1103 K find: (a) the reaction quotient intially (b) the order of concentration of...
Tuesday, May 19, 2015 by Kibito

chemistry
you are given a sample mass of 250g compound that is 45% water. How many grams of water can be recovered from the sample by dehydration?
Tuesday, May 19, 2015 by rish

Chemistry
What is the concentration of acid or base remaining after reaction if 21 ml of 0.54 M sulfuric acid is mixed with 39 milliliters of 0.12 M sodium hydroxide?
Tuesday, May 19, 2015 by Annie

chemistry
how many grams of NaOH pallets containing 12% moisture are requiredto prepared 60 ltr of 0.5N solution
Tuesday, May 19, 2015 by shweta

Chemistry
How many grams of AgNO3 will precipitate when 150 mL of 0.5 M AgNo3 adds to 100 ml 0.4 M KCrO4? Please answer immediately.
Monday, May 18, 2015 by who cares about that?

Chemistry
I would like to check my answer to the following question: The permanganate ion oxidizes bromide in acidic conditions to form bromine, manganese(II) ion and water. Give the balanced equation of the reaction. My answer: 3e- + 8H+ (aq) + MnO4- (aq) + 2Br- (aq)  Br2 (aq...
Monday, May 18, 2015 by Kelsy

Chemistry
a bicycle is filled with air to a pressure of 6.80atm and a temperature of 19 degrees celsus. Riding the ike on asphalt on a hot day increases the temperature of the tire to 58 degrees celcius. The volume of the tire increases by 4.0%. What is the new pressure in the bicycle ...
Monday, May 18, 2015 by Unathi

algebra 2 and trig
The scores on a chemistry test are normally distributed. Approximately 95 percent of the scores fell between 78 and 92. What is the standard deviation for this distribution?
Monday, May 18, 2015 by caroline

Science (Chemistry)
A chemical system within a sealed 1 L reaction vessel is described by the following reversible reaction equation: 2H2S(g) <---> 2H(g) + S2(g) If the equilibrium constant is 0.000 004 200 at 1103 K find: (a) the reaction quotient intially (b) the order of concentration of...
Monday, May 18, 2015 by Kibito

Chemistry
if 6.5kJ of energy are added to 56.4g sample of iron at 24 degrees C what is the final temperature of the iron? The specific heat of iron is 0.449j/gC
Monday, May 18, 2015 by Lexa

Chemistry
what mass of precipitate will form if a saturated solution of potassium nitrate is dropped from a temperature of 70 degrees celsius to a temperature of 45 degrees celsius?
Monday, May 18, 2015 by Abby

Chemistry
A 10.0mL sample of H2SO4 was neutralized by 13.5mL of 1.0M KOH. What was its molarity of H2SO4? What is the normality?
Monday, May 18, 2015 by Michelle

chemistry
a beaker contains 75.6 grams magnesium oxide (MgO) in 175 ml of solution, calculate the molarity?
Monday, May 18, 2015 by kedron

chemistry
how to prepare 500ml of a 0.75M Sodium Phosphate buffer solution at pH 7.5, how would you go about doing that?
Monday, May 18, 2015 by Jenna

Chemistry-Decay
The lowest level of 14C activity that seems possible for experimental detection is 0.03 dis min−1 g−1 What is the maximum age of an object that can be determined by the carbon-14 method? The initial rate of decay is about dis min−1 g−1. I have no idea ...
Sunday, May 17, 2015 by Alyson

Analytic Chemistry
At 25 °C, you conduct a titration of 15.00 mL of a 0.0260 M AgNO3 solution with a 0.0130 M NaI solution within the following cell: Saturated Calomel Electrode || Titration Solution | Ag (s) For the cell as written, what is the voltage after the addition of the following ...
Sunday, May 17, 2015 by Dasha

chemistry
In which case will the equilibrium constant (K) be less than 1 at 298 K? (a) DeltaH = 4.55 kJ/mol ,deltaS = 28.0 J/mol K (b) delta H = - 4.55 kJ/mol ,deltaS = 28.0 J/mol K (c)deltaH = 4.55 kJ/mol ,deltaS= - 28.0 J/mol K (d) both (a) and (b) I know the answer is c but I don'...
Sunday, May 17, 2015 by Anon

College Chemistry
For the reaction that occurs in the voltaic cell Fe(s)|Fe2+(aq)||Cr3+(aq),Cr2+(aq)|Pt(s) use data from Appendix D in the textbook to answer the following questions: a)Determine the equation for the cell reaction b)Determine E0 cell c)Determine ΔG0 d)Determine K I'm ...
Sunday, May 17, 2015 by Brandon

Chemistry - PLEASE HELP!!!
25g NaOH is dissolved in 10 ml h20 and added to 100 ml volumetric flask. Calculate the concentration in molarity.
Sunday, May 17, 2015 by Marie

Chemistry - Equilibrium
(h) If a catalyst was added to the reaction, which quantities would change? (Select all that apply.) - the potential energy of the products - the potential energy of the reactants - the potential energy of the activated complex -the activation energy for the reverse reaction...
Sunday, May 17, 2015 by Taylor

Chemistry
The approximate concentration of a hydrochloric acid solution is 0.5M. The exact concentration of this solution is to be determined by the titration with 0.5M solution of sodium hydroxide. A 10.00 ml of HCl solution was transferred by pipet to an Erlenmeyer flask. What is the ...
Sunday, May 17, 2015 by Ericka

Chemistry
which of the following is the stongest oxidizing agent? 1.NaBiO3, 2. K2Cr2O7, 3. KMnO4, 4. PbO2
Sunday, May 17, 2015 by ATUL

chemistry
A sample of argon has a volume of 735 mL at a pressure of 1.20 atm and a temperature of 385 K. What is the volume of the gas in milliliters when the pressure and temperature of the gas sample are changed to 15.4 atm and 2580C? This problem involves changes in pressure, ...
Saturday, May 16, 2015 by jamie

chemistry help
calculate the PH of a buffered solution of HF and F (Pka of HF is 3.2)
Saturday, May 16, 2015 by Anonymous

chemistry help
Suppose the Cu electrode was replaced by an Al electrode. In order for this new cell to be a galvanic cell, which electrode would be the anode, Zinc or Aluminum?
Saturday, May 16, 2015 by Anonymous

chemistry
CO2 + 3H2 equilibrium CH4 + H2O what is the forward and reverse reaction for it? what are the units of Kc for this reaction?
Saturday, May 16, 2015 by haseeb

Chemistry
2Li + Cu(NO3) > 2LiNO3 + Cu
Friday, May 15, 2015 by Nor

chemistry- Check please
I am given a question where I have to state which combination of electrodes will result in the greatest voltage and which will result in the lowest voltage. The metals given are Zinc, Copper, Silver and Hydrogen I calculated the Ecell for each combination and got the following...
Friday, May 15, 2015 by Sara

chemistry
saline solution mass is 53.0 at 4 degrees equal volume of water, same temp had a mass 51.5g what is the density of the saline solution?
Thursday, May 14, 2015 by kaela

chemistry
The boiling point of diethyl ether, CH3CH2OCH2CH3, is 34.500 °C at 1 atmosphere. Kb(diethyl ether) = 2.02 °C/m In a laboratory experiment, students synthesized a new compound and found that when 13.85 grams of the compound were dissolved in 283.2 grams of diethyl ether...
Thursday, May 14, 2015 by JC

Chemistry
Consider the combustion of ethane: 2C2H6(g)+7O2(g)-->4CO2(g)+6H2O(g) If the ethane is burning at the rate of 0.7 mol/L × s, at what rates are and being produced?
Thursday, May 14, 2015 by Jack

  1. Pages:
  2. <<Prev
  3. 1
  4. 2
  5. 3
  6. 4
  7. 5
  8. 6
  9. 7
  10. 8
  11. 9
  12. 10
  13. 11
  14. 12
  15. 13
  16. 14
  17. 15
  18. Next>>

Homework Help: Science

Members