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February 9, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Organic Chemistry 2
What is the purpose of adding NaOH ot the reaction? This is the from our Benzil Lab.
Saturday, November 7, 2015 by John

Organic Chemistry 2
What is the impurity that must be removed from the benzaldehyde reagent before it can be used in this experiment? this is from are Benzil lab
Saturday, November 7, 2015 by John

Organic Chemistry
Identify the following compound from its IR and proton NMR spectra. C5H6O: IR: 3300 (sharp), 2102, 1634 cm–1 NMR: δ 3.10 (1H, d, J = 2 Hz); δ 3.79 (3H, s); δ 4.52 (1H, doublet of doublets, J = 6 Hz and 2 Hz); δ 6.38 (1H, d, J = 6 Hz)
Saturday, November 7, 2015 by Anonymous

Chemistry
In the process of respiration, glucose is oxidized completely. In fermentation, O2 is absent, and glucose is broken down into Co2 and H2o. Calculate delta g for respiration of 1.00 g of glucose Calculate delta g for fermentation of 1.00 g of glucose. My answers: -16.0 kJ and -...
Saturday, November 7, 2015 by Judith

Chemistry
Styrene is produced by catalytic dehydrogenation of ethyl- benzene at high temperature in the presence of superheated steam. (a) Find ÄH°rxn, ÄG °rxn, and ÄS °rxn, given these data at 298 K: (b) At what temperature is the reaction spontaneous? What ...
Saturday, November 7, 2015 by Dalton

Chemistry
how much limestone would be required to change the ph value from 4 to 4.5 in 20000 cubic of water?
Saturday, November 7, 2015 by Jerry

chemistry
Magnesia (MgO(s)) is used for fire brick, crucibles and furnace linings because of its high melting point. It is produced by decomposing magnesite (MgCO3(s)) into at around 1200oC Write a balanced equation for the magensite decomposition being sure to include states for the ...
Saturday, November 7, 2015 by Kyson

Chemistry- Dr. Bob
Question 1 Calculate the wavelength (in nm) of the red light emitted by a neon sign with a frequency of 4.74 x 1014 Hz. A) 704 nm B) 158 nm C) 466 nm D) 633 nm E) 142 nm My answer: D.633 nm Question 2 How many photons are contained in a burst of yellow light (589 nm) from a ...
Saturday, November 7, 2015 by Anonymous

Chemistry- Dr. Bob
An electron in the n=7 level of the hydrogen atom relaxes to a lower energy level, emitting light of 2166 nm. What is the value of n for the level to which the electron relaxed?
Saturday, November 7, 2015 by Anonymous

St Ann's College (DDL) Enugu
In A Class Of 60 Students, 30 Offer Physcis And 40 Offer Chemistry, (a)Use Venn Diagram To Represent This Information (b) How Many Students Offer Both Subject
Saturday, November 7, 2015 by Ikechukwu

chemistry
Given two liters of 0.496M KCl describe how you would use this solution to prepare 250.0 ml of 0.175M KCl.
Saturday, November 7, 2015 by julie

science-chemistry
The free energy generated by ion movement in the cell is used by the cell to do work. Compute the minimum number of millimoles of sodium that would be needed to pump one millimole of calcium ions if the following concentrations were present in the cell. Assume the temperature ...
Saturday, November 7, 2015 by rashi

science-chemistry
The Ksp of mercury(II) hydroxide, Hg(OH)2, is 3.60 × 10-26. Calculate the solubility of this compound in g/L. Gf of H2CO3 = -616.1 KJ/mol Gf of H20 = -237.1 KJ/mol Gf of CO2 = - 394.4 KJ/mol 3.
Saturday, November 7, 2015 by rashi

chemistry
Calculate K at 298 K for the following reactions. NO(g) + 1/2 O2(g)......> NO2(g) Nog 86.60 No2 g 51 o2.... O I got 6.81 x 10^-7........thank you.
Saturday, November 7, 2015 by Patrick

chemistry
Calculate K at 298 K for the following reactions. NO(g) + 1/2 O2(g)......> NO2(g) Nog 86.60 No2 g 51 o2.... O I got 6.81 x 10^-7........thank you.
Saturday, November 7, 2015 by Patrick

chemistry
Calculate K at 298 K for the following reactions. NO(g) + 1/2 O2(g)......> NO2(g) Nog 86.60 No2 g 51 o2.... O I got 6.81 x 10^-7........thank you.
Saturday, November 7, 2015 by Patrick

Chemistry
What is the molarity of a solution prepared by placing 7.2 g of glucose in a volumetric flask and adding water to get 250.0 mL of solution?
Friday, November 6, 2015 by Sara

soil chemistry
Can someone please help me answering this question regarding soil chemistry? A sandy soil has a CEC = 5 meq/100g and a K saturation = 6%. An alfalfa crop yields 5 ton/ac/yr at 3% K. Calculate initial exchangeable K and estimate final exchangeable K. Where did the additional K ...
Friday, November 6, 2015 by Anonymous

Chemistry
a diver swimming at a depth of 10m under the water observes that the size of his air bubbles increase in volume as they rise to the waters surface. which gas law does this relate to?
Friday, November 6, 2015 by sheryl

Chemistry
Calculate how much charcoal(carbon) is needed to reduce 40kg of Fe2O3
Friday, November 6, 2015 by Munira

Chemistry
which of the following categories includes two-thirds of all elements? a.Metalloids b.metals c.liquids d.nonmetals C. I know metals take up 3/4 of it? I'm unsure
Friday, November 6, 2015 by Deb

Chemistry
4.80 L of N2, at 25 ∘C and 1.22 atm , is mixed with 1.80 L of O2, at 25 ∘C and 0.122 atm , and the mixture allowed to react. N2(g)+O2(g)→2NO(g) How much NO, in grams, is produced?
Friday, November 6, 2015 by Ethan

Chemistry
A 8.25-L container holds a mixture of two gases at 39 °C. The partial pressures of gas A and gas B, respectively, are 0.186 atm and 0.884 atm. If 0.120 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?
Friday, November 6, 2015 by Amber

chemistry
the volume of a gas measured at 27 c and 101.3 kpa is 20.0 dm3 what final temperature would be required to increase the volume too 40.0 at 101 kpa
Friday, November 6, 2015 by ibrahim

CHEMISTRY
Oxygen gas can be generated by heating KClO3 in the presence of some MnO2. 2KClO3 → 2KCl + 3O2 If all the KClO3 in a mixture containing 1.64 g KClO3 and 0.20 g MnO2 is decomposed, how many liters of O2 gas will be generated at T = 23.0°C and P = 767.9 torr?
Friday, November 6, 2015 by Anonymous

Chemistry
Calculate the grams of a product that is produced when there is 23 gms of each product Al2O3
Friday, November 6, 2015 by Jane

chemistry
The value of Change in heat for the reaction below is -790 KJ. Calculate the enthalpy change accompanying the reaction of .95 g of S. 2S(s) + 3 O2 --> 2 SO3(g)
Friday, November 6, 2015 by Anonymous

Chemistry URGENT PLEASE PLEASE PLEASE HELP!
Determine whether the solution is basic, acidic, or neutral. Write net ionic equations to show how it behaves in aqueous solutions. 1) Fe2(SO4)3 I know it is acidic Do I do hydrolysis equations for the net ionic or do I do redox reactions?
Thursday, November 5, 2015 by Anonymous

Chemistry
If I add 2ml of .1M of NaOH to a buffer system containing sodium acetate and acetic acid, what will happen to the acetate concentration? Will it increase or decrease?
Thursday, November 5, 2015 by Anonymous

Chemistry
How many grams of ethanol, C2H5OH, can be boiled with 343.0 kJ of heat energy? The molar heat of vaporization of ethanol is 38.6 kJ/mol I'm not sure how I am supposed to set this problem up. Can someone help me, please?
Thursday, November 5, 2015 by Chris

chemistry
Precipitation of Ni2+ from a 25 mL aliquot of a solution of unknown concentration yielded 0.338 g of Ni(DMGH)2. Calculate the concentration of the Ni2+ solution
Thursday, November 5, 2015 by Anonymous

f.s.t.c y
(chemistry) 23g of ethanol was mixed with 72g of water in a reaction vessel.calculate the mole fraction and mole percent of water.calculate the mole fraction and mole percent of ethanol
Thursday, November 5, 2015 by shazali

chemistry
3NO2(g) + H2O(l) → 2HNO3(l) + NO(g) How many moles of the excess reactant remain if 2.00 moles of H2O(l) and 5.00 moles of NO2(g) are used? Question 30 options: 1.67 mol H2O(l) 3.00 mol NO2(g) 4.00 mol NO2(g) 1.00 mol NO2(g) 0.33 mol H2O(l)
Thursday, November 5, 2015 by beverly

chemistry
How many moles of carbon monoxide gas are produced from the reaction of 5.00 moles of SnO2(s) with 9.00 moles of carbon according to the equation below? SnO2(s) + 2C(s) → Sn(s) + 2CO(g) Question 28 options: 4.50 mol 9.00 mol 18.0 mol 5.00 mol 7.50 mol
Thursday, November 5, 2015 by beverly

chemistry
How many moles of nitric acid are produced starting from 5.00 moles of NO2(g) and 2.00 moles of water? Question 29 options: 4.00 mol 1.67 mol 7.50 mol 3.33 mol 10.0 mol
Thursday, November 5, 2015 by beverly

chemistry
How many moles of carbon monoxide gas are produced from the reaction of 5.00 moles of SnO2(s) with 9.00 moles of carbon according to the equation below? SnO2(s) + 2C(s) → Sn(s) + 2CO(g) Question 28 options: 4.50 mol 9.00 mol 18.0 mol 5.00 mol 7.50 mol
Thursday, November 5, 2015 by beverly

chemistry
5NaN3(s) + NaNO3(aq) → 3Na2O(s) + 8N2(g) If 1.50 g of N2(g) are produced, how many grams of Na2O(s) are also produced? Question 26 options: 8.85 g 3.32 g 2.05 g 2.22 g 1.24 g
Thursday, November 5, 2015 by beverly

chemistry
3NO2(g) + H2O(l) → 2HNO3(l) + NO(g) How many moles of NO2(g) are required to react with 1.00 mole of water to produce 3.00 moles of nitric acid? Question 24 options: 6.00 mol 1.50 mol 2.00 mol Not enough water is available to produce 3.00 moles of nitric acid. 4.50 mo
Thursday, November 5, 2015 by beverly

chemistry
5NaN3(s) + NaNO3(aq) → 3Na2O(s) + 8N2(g) If 1.50 g of N2(g) are produced, how many grams of Na2O(s) are also produced? Question 26 options: 8.85 g 3.32 g 2.05 g 2.22 g 1.24
Thursday, November 5, 2015 by beverly

Chemistry
Solve with half equation reaction SO3 2- + MnO4 -=SO4 2- + Mn2+
Thursday, November 5, 2015 by Kabih kush

chemistry
How many oxygen atoms are present in 2.00 millimoles of H2SO4?
Thursday, November 5, 2015 by beverly

chemistry
Copper(II) nitrate decomposes upon heating to form copper(II) oxide, nitrogen dioxide gas, and oxygen gas. If 1.0 mole of copper(II) nitrate decomposes, how many moles of nitrogen dioxide would be formed?
Thursday, November 5, 2015 by beverly

chemistry
3NO2(g) + H2O(l) → 2HNO3(l) + NO(g) How many moles of nitric acid are produced starting from 5.00 moles of NO2(g) and excess water?
Thursday, November 5, 2015 by beverly

chemistry
3NO2(g) + H2O(l) → 2HNO3(l) + NO(g) How many moles of NO2(g) are required to react with 1.00 mole of water to produce 3.00 moles of nitric acid?
Thursday, November 5, 2015 by beverly

Chemistry
An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck's constant is 6.626 × 10-34 joule seconds, the speed of light is 2.998 × 108 m/s)
Thursday, November 5, 2015 by 007

chemistry
Initially a vessel is charged at 1000K with SO3 at a partial pressure of 0.5atm. At equilibrium the SO3 partial pressure is 0.2atm. Calculate the value of Kp at 1000K. 2SO3->2SO2+O2 My answer: 0.5-0.2=0.3atm SO2=0.3atm*2/2mol= 0.3 O2=0.3atm*1/2mol=0.8 Therefore 0.8-0.3=0.5 ...
Thursday, November 5, 2015 by aadilah

chemistry
To a 100.0 mL solution containing 0.0100 M Ba(NO3)2 and 0.0100 M Pb(NO3)2 was added 101.0 mL of 0.0100 M H2SO4 to provide a slight excess of SO42- relative to Ba2+ in the resulting solution. Assuming that: i) H+ does not bind to SO42- ii) ionic strength effects can be ignored ...
Wednesday, November 4, 2015 by john

Chemistry
A change cannot occur spontaneously if it is accompanied by: A. An energy decrease and an increase in randomness. B. An energy increase and an increase in randomness. C. An energy decrease and a decrease in randomness. D. An energy increase and a decrease in randomness. E. A ...
Wednesday, November 4, 2015 by Anonymous

chemistry
what is the connection between periodic trends and relative reactivity?
Wednesday, November 4, 2015 by XOXOX

chemistry
what is the mass of bromine contains the same number of atoms of 50.0 g of iodine? my work: 50g/79.5g= .628 mol(Br) 50g/126g=.394 mol(I)
Wednesday, November 4, 2015 by fatima

Chemistry
what is the wave length and type of light released when an electron absorbs 3.03 x10 -19 j of energy
Wednesday, November 4, 2015 by Jonathan

chemistry
Initially a vessel is charged at 1000K with SO3 at a partial pressure of 0.5atm. At equilibrium the SO3 partial pressure is 0.2atm. Calculate the value of Kp at 1000K. 2SO3->2SO2+O2 My answer: 0.5-0.2=0.3atm SO2=0.3atm*2/2mol= 0.3 O2=0.3atm*1/2mol=0.8 Therefore 0.8-0.3=0.5 ...
Wednesday, November 4, 2015 by aadilah

chemistry
A 0.1028 g impure sample consists of Na2CO3 was analyzed by the Volhard method. After adding 50.00 mL of 0.06208 M AgNO3, the sample was back titrated with 0.06261 M KSCN, requiring 28.36 mL to reach the end point. Report the purity of the Na2CO3 sample
Wednesday, November 4, 2015 by yun

Chemistry
Determine ∆G° (in kcal) for the reaction CCl4(ℓ) + H2(g) HCl(g) + CHCl3(ℓ) at 25 °C under standard conditions. The following information is available: At 25 °C C(graphite) + 2Cl2(g) CCl4(ℓ) ∆S° = -56.23 cal K-1 C(graphite) + Cl2(g...
Wednesday, November 4, 2015 by Anonymous

Chemistry
If 0.400ml CH3CO2H and 0.200ml of 0.100M NACH3COO What is the pH of the resulting solution.
Wednesday, November 4, 2015 by Buffy

Chemistry
The air was in a cylinder equipped with the piston absorbs 565 duels of heat and expands from an initial volume of .10 l to a final volume of .85 L against an external pressure of 1.0 ATM what is the change an internal energy of the air within the cylinder
Wednesday, November 4, 2015 by Daisy

chemistry
calculate the mass in grams of copper that will be deposited by dissolving 6.5g of zinc in copper tetraoxosulphate(vi)solution
Wednesday, November 4, 2015 by kabiru ali

Chemistry VERY URGENT PLEASE
A) NaOH(s) > NaOH(aq) B) NaOH(s) + HCl(aq) > NaCl(aq) + H2O(l) C) NaOH(aq) + HCl(aq) > NaCl(aq) + H2O(l) Examine the 3 reaction equations, and determine the relationship between them. Demonstrate this relationship by combining the equations in a manner consistent with...
Tuesday, November 3, 2015 by Finn

Chemistry (Check)
How many grams of NaOH are in 500mL of a 0.50 M solution? 500mL=.5L MM NaOH = 39.99711g M x V = n 0.5 x 0.5 = .25moleNaOH .25moleNaOH x (39.99711gNaOH / 1moleNaOH) = 10.gNaOH Is this right? If not, please tell me what I did wrong.
Tuesday, November 3, 2015 by Anonymous

Chemistry
Describe how you would prepare 500 mL of a 0.10 M solution of HCl from a 12.0 M solution of HCl.
Tuesday, November 3, 2015 by Sarah

Chemistry (Help)
0.275gAgNO3 is dissolved in 500mL of solution. a. What is the molarity of this solution. b. If 10.0 mL of this solution are transferred to a flask and diluted to 500mL, what is the concentration of the resulting solution? c. If 10.0mL of the solution in (b) are transferred to ...
Tuesday, November 3, 2015 by Anonymous

Chemistry.
Mg+2HCl--->MgCl2+H2 Using the balanced equation, how many moles of H2 will you make if you start with .00082 moles of Mg solid? How many grams of H2 is that?
Tuesday, November 3, 2015 by Sarah

Chemistry (Check and Help)
Which is more concentrated, 500mL of a .20M solution of NaCl or 250mL of a .25M solution of NaCl? MMNaCl = 58.44247 M x V = n .5L x .2M = .1moleNaCl .1moleNaCl x (58.44247gNaCl / 1moleNaCl) = 6gNaCl .25L x .25M = .0625moleNaCl .0625moleNaCl x (58.44247gNaCl / 1moleNaCl) = 3....
Tuesday, November 3, 2015 by Anonymous

Chemistry (Check)
How many grams of NaOH are in 500 mLm of a 0.50M solution? 500mL --> .5L MM NaOH = 39.997g M x V = n .5 x .5 = .25moleNaOH .25moleNaOH x (39.99711gNaOH / 1moleNaOH) = 10.gNaOH Is this right? If not, what am I doing wrong?
Tuesday, November 3, 2015 by Anonymous

chemistry
In the industrial preparation of HNO3, NH3 is burnt in O2 in the presence of a catalyst, according to the following equation; 4NH3 + 502 - 4NO +6HO If 260ccm3 of NH3 is burnt completely. what volume of O2 is used up and NO is produced
Tuesday, November 3, 2015 by Precious

Chemistry
In a titration of 35 mL of 0.40 M H3PO4 with 0.30 M KOH solution, what volume (in mL) of KOH solution is needed to reach the last equivalence point (i.e., point in the titration where enough KOH has been added to neutralize all three of the acidic protons in the phosphoric acid)?
Tuesday, November 3, 2015 by Anonymous

Chemistry
In a titration of 35 mL of 0.40 M H3PO4 with 0.30 M KOH solution, what volume (in mL) of KOH solution is needed to reach the last equivalence point (i.e., point in the titration where enough KOH has been added to neutralize all three of the acidic protons in the phosphoric acid)?
Tuesday, November 3, 2015 by Anonymous

chemistry
C3H6O + 4O2 --> 3CO2(g) + 3H2O(g) deltaH= -1790kJ the density of C3H6O is 0.79g/mL. HOw much heat is released by the combustion of 150mL of acetone?
Tuesday, November 3, 2015 by Melanie

AP Chemistry
At 25 degrees C, a sample of NH3( molar mass 17 g) effuses at the rate of .050 mole per minute. Under the same conditions, which of the following gases effuses at approxiomatesly half that rate? A- O2 B- He2 C-CO2 D-CI2 E-CH4
Tuesday, November 3, 2015 by Anonymous

Chemistry (Check)
PF3 reacts with XeF4 to give PF5 2PF3(g) + XeF4(s) --> 2PF5(g) + Xe(g) How many moles of PF5 can be produced from 100.0 grams of PF3 and 50.0 grams of XeF4? 100.0gPF3 x (1molePF3 / 87.96896gPF3) x (2molesPF5 / 2molesPF3) = 1.14molesPF5 50.0gXeF4 x (1moleXeF4 / 207.2836gPF3...
Tuesday, November 3, 2015 by Anonymous

Chemistry
The thermite reaction, used to weld rails together in the building of railroads, is described by the following equation. Fe2O3(s) + 2Al(s) --> Al2O3(s) + 2Fe(l) Calculate the mass of iron metal that can be prepared from 150 grams of aluminum and 250 grams of iron (III) ...
Tuesday, November 3, 2015 by Anonymous

Chemistry - Acid and Bases
In aqueous solution, classify these compounds as strong acids, weak acids, strong bases, weak bases, or other. HNO3 HBr HF CH3COOH H3PO4 NaOH Ba(OH)2 (CH3)3N NH3 NaCl
Monday, November 2, 2015 by Anonymous

CHEMISTRY!!
For the diprotic weak acid H2A, Ka1 = 2.0 × 10^-6 and Ka2 = 6.7 × 10^-9. What is the pH of a 0.0800 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?
Monday, November 2, 2015 by GARRETT

Chemistry
How much carbon dioxide is produced upon the complete combustion of 17.3L of propane (approximately content of one 5-gal tank)? Assume that the density of the liquid propane in the tank is 0.621 g/mL. Can you please list the steps! I am really confused! I tried many ways but I...
Monday, November 2, 2015 by Maira

chemistry
if 40g of KNO3 is dissolved in 100ml water at 25 C WHAT WILL FINAL TEMP BE? SHOW ALL WORK
Monday, November 2, 2015 by sara

Chemistry
H3PO4(aq) + 3 KOH(aq) → K3PO4(aq) + 3 H2O(l) How many grams of potassium hydroxide are required to completely neutralize 3.23 grams of phosphoric acid?
Monday, November 2, 2015 by ...

Chemistry
Determine the number of grams of water in 7.00 g of copper(II) sulfate pentahydrate.
Monday, November 2, 2015 by Liz

Chemistry
A hypothetical covalent molecule, X–Y, has a dipole moment of 1.62 D and a bond length of 179 pm. Calculate the partial charge on a pole of this molecule in terms of e (where e is the charge on an electron).
Monday, November 2, 2015 by Jordann

Chemistry (Help)
For the chemical reaction, sodium hydroxide + copper (II) chloride = "robin's egg blue" precipitate, do the following: write the balanced molecular, balanced total ionic, and balanced net ionic equations; determine the Limiting Reactant (LR) for each chemical ...
Monday, November 2, 2015 by Anonymous

Chemistry (Check and Help)
Upon the combustion of propane, C3H8, 150. g of propane was reacted with excess oxygen gas. A. Determine the limiting reactant if the water is the product of interest. B. Determine the number of grams of water produced. C. Calculate the number of grams of water obtained in the...
Monday, November 2, 2015 by Anonymous

Chemistry (Check and Help)
Determine the type of chemical reaction, find the limiting reagent, determine the amount of product in grams, and the amount in grams of excess reagent. 8.75 g of mercury (II) nitrate solution is mixed with 9.83 g sodium iodide solution (ppt). Hg(NO3)2(aq) + 2NaI(aq) --> ...
Monday, November 2, 2015 by Anonymous

Chemistry (Check and Help)
Determine the type of chemical reaction, find the limiting reagent, determine the amount of product in grams, and the amount in grams of excess reagent. 6.95 moles of glucose C6H12O6(s) is combusted with 7.54 moles of O2 gas (both products!) C6H12O6(s) + 6O2(g) --> 6CO2(g...
Monday, November 2, 2015 by Anonymous

Chemistry (Check)
Determine the type of chemical reaction, find the limiting reagent, determine the amount of product in grams, and the amount in grams of excess reagent. Calcium nitrate is decomposed with heat to give calcium nitrite and oxygen gas. Start with 15.99g of calcium nitrate. Ca(NO3...
Monday, November 2, 2015 by Anonymous

Chemistry
Determine the type of chemical reaction, find the limiting reagent, determine the amount of product in grams, and the amount of grams of excess reagent. Chromium metal is heated with oxygen to give chromium (III) oxide. Start with 38.5 moles chromium metal and unlimited oxygen...
Monday, November 2, 2015 by Anonymous

Chemistry
Calculate the work, in kJ, done when 126 g of tin dissolves in excess acid at 25.0˚C and 1.00 atm. Assume Ideal Gas behavior. Sn(s) + 2 H+(aq) → Sn2+(aq) + H2(g) I basically need to know how to find the change in volume since work=-pressure*volume change and I have ...
Monday, November 2, 2015 by Carol

Chemistry
How much heat (in kilojoules) is released on reaction of 5.30 g of Al?
Sunday, November 1, 2015 by Donny

Chemistry
Pb + S yield FeS
Sunday, November 1, 2015 by D

Chemistry
3.90g sample of Al with an unknown initial temperature is dropped into 10 mg of water at 22.6 degrees Celsius. What will teh change in temperature be of the Al if its final temperature is 28.6 degrees Celsius?
Sunday, November 1, 2015 by Connor

cheMistry
a) Silver iodide(s) is formed by the following reaction: Ag (aq) + I (aq) --> AgI (s) The Ksp for AgI = 1.8 x 10^-10 Describe, using the chemical reaction, the mathematical formula for these ions. Assuming these ion concentrations are equal, what would the molarity be for ...
Sunday, November 1, 2015 by hank

Chemistry
Ca(OH)2+Na2CO3> 2NaOH + CaCO3 50g hydroxide and 50g sodium carbonate are reacted. How many grams sodium hydroxide will be made?
Sunday, November 1, 2015 by Ashley

Chemistry
Suppose that 120 g of ethanol at 24◦C is mixed with 275 g of ethanol at 81◦C at constant atmospheric pressure in a thermally insulated vessel. What is the ∆Ssys for the process? The specific heat capacity for ethanol is 2.42J/g K. Answer in units of J/K. Can ...
Sunday, November 1, 2015 by Alexis

Chemistry
The heat of neutralization of HCl(aq) and NaOH(aq) is -55.90 kJ/mol of water produced. If 50.00 mL of 1.16 M NaOH at 25.15 ºC is added to 25.00 mL of 1.79 M HCl at 26.34 ºC in a plastic-foam cup calorimeter, what willthe solution temperature be immediately after the ...
Sunday, November 1, 2015 by Alexis

Chemistry
How do you find the Ka1 and Ka2 of oxalic acid when it is in a solution that is 1.05 M H2C2O4 and has a pH of 0.67. [C2O4^2-] = 5.3x10^-5 M. I have tried using an ICE table for both reactions, as oxalic acid is a diprotic acid, but I am having trouble knowing where to put ...
Sunday, November 1, 2015 by Erika

Chemistry
An experiment requires 0.34 M NH3(aq). The stockroom manager estimates that 15 L of the base is needed. What volume of 15 M NH3(aq) will be used to prepare this amount of 0.34 M base?
Sunday, November 1, 2015 by Liz

chemistry
How much does the molar enthalpy change when 147g of water cools from 90°C to 17.0°C? The molar heat capacity for water is 75.3 j/k•mol
Sunday, November 1, 2015 by Gino

Chemistry
For the chemical reaction, sodium hydroxide + copper (II) chloride = "robin's egg blue" precipitate, do the following: write the balanced molecular, balanced total ionic, and balanced net ionic equations; determine the Limiting Reactant (LR) for each chemical ...
Sunday, November 1, 2015 by Anonymous

Chemistry
Dissolving calcium hydroxide (∆Hsoln = -16.2 KJ/mol) in water is an exothermic process. How much lithium hydroxide (∆Hsoln = -23.6 KJ/mol) is needed to deliver the same amount of heat as 15.00 g of Ca(OH)2? Hello everyone, thank you for taking a look at my question...
Sunday, November 1, 2015 by Ka_Chin

Burnhamthrop Chemistry
initially 0.25 mol of water vapour and 0.20 mor of carbon monoxide are place in a 1.00 L reaction vessel. at equilibrium spectroscopic evidence shows that 0.10 mol of corbon dioxide is present calculate K for the reaction
Saturday, October 31, 2015 by Omar

chemistry
0.5 mol CCl4 is introduced into a 10.0L flask.what fraction of the total volume of the flask is occupied by CCl4 molecules?
Saturday, October 31, 2015 by faiz

Chemistry
A 0.1818 g sample of sodium oxalate required 28.12 ml of a potassium permanganate solution to reach the endpoint (assume the reaction was carried out in excess acid). A 5.000 g sample of tin (II) sulfate containing potassium sulfate as an impurity was found to require 35.00 ml...
Saturday, October 31, 2015 by Anonymous

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