Friday
August 29, 2014

Posts by sparkle


Total # Posts: 37

chemistry
A 1.857 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO3 and HCl aqueous solution. To this solution was added 1.540 grams of KI and 50.00 mL of a 0.00912 M KIO3 solution. The excess I3– was titrated with 50.00...
May 2, 2013

Chemistry
Calculate the de Broglie wavelength associated with a body of mass 1.5 kg moving with a velocity of 100m/s.
October 21, 2012

Chemistry
The density of platinum is 23.4 g/cm cubed. Calculate the mass of 75.0cm cubed of platinum.
September 25, 2012

business Communication
Which of the following is NOT an example of parallel structure? a. Yoga can help you develop flexibility, reduce stress, and increase relaxation. b. Learn how to analyze business audience, improve your style, and edit thoroughly. c. You are all encouraged to come and shart ...
March 30, 2011

college chemistry
I tried doing that but the value was so high that I wanted to compare answers with something you would get DrBob222. My answer was something e^136
December 2, 2010

college chemistry
The voltaic cell described by the balanced chemical reaction has a standard emf of 4.05 V. Calculate the equilibrium constant (Kc) for the reaction at 25 oC. Round your answer to 3 significant figures. F2(g) + Mn(s) → 2F-(aq) + Mn2+(aq) Mn2+/Mn -1.18 F2/F- +2.87 0 °C...
December 2, 2010

college chemistry
how do you balance this redox equation? Co(OH)2(aq) + Na2O2(aq) → Co(OH)3(s) + NaOH(aq)
November 23, 2010

college chemistry
The rate of the following reaction: 2 NO2 2 NO + O2, is characterized by the rate constant k = 0.775 L·mol-1s-1. What is the half-life for this reaction at the same conditions when the initial concentrations are 0.0115 M? (Round your answer to 3 significant figures.) ...
November 10, 2010

college chemistry
A solution of C6H5CO2Na hydrolyzes according to the equation. If the [C6H5CO2H] in the solution after hydrolysis is 0.00000294 M, calculate the equilibrium concentration of C6H5CO2Na. C6H5CO2-(aq) + H2O(l) = OH-(aq) + C6H5CO2H(aq) Kh=1.59×10-10 What does Kh stand for? Is...
November 5, 2010

college chemistry
The base dissociation equilibrium constant (Kb) for C5H5N is 1.40×10-9 (eq. 1). (eq. 1): C5H5N(aq) + H2O(l) = OH-(aq) + C5H5NH+(aq) Calculate the value of the equilibrium constant (Ka) for the hydrolysis of C5H5NH+ as shown in the reaction (eq. 2). (eq. 2): C5H5NH+(aq...
November 4, 2010

college chemistry
Balance the equation in aqueous basic solution: Fe(CN)64-(aq) + Ce4+(aq) → Ce3+(aq) + Fe3+(aq) + CO32-(aq) + NO3-(aq)
November 4, 2010

college chemistry
Balance the equation in aqueous acidic solution: C2O42-(aq) + MnO4-(aq) → Mn2+(aq) + CO2(g) please teach me how to do it!
November 4, 2010

college chemistry
Balance the equation in aqueous basic solution: ClO3-(aq) + Fe(OH)3(s) → FeO42-(aq) + Cl-(aq)
November 4, 2010

college chemistry
Calculate the [CH3NH3+] of a 7.02×10-3 M solution of the weak base CH3NH2 (make an approximate calculation assuming that initial concentration is equal to the equilibrium concentration). Round your answer to 3 significant digits. CH3NH2 + H2O = CH3NH3+ + OH-
October 26, 2010

college chemistry
When a sample of HI(g) (5.825 mol) is placed in 320.0 L reaction vessel at 702.0 K and allowed to come to equilibrium the mixture contains 1.052 mol of H2(g). What is the equilibrium concentration (mol/L) of HI(g)? 2HI(g) = H2(g)+I2(g)
October 12, 2010

college chemistry
When a sample of NO(g) (388.1 grams) is placed in 290.0 L reaction vessel at 500.0 °C and allowed to come to equilibrium the mixture contains 53.28 grams of N2(g). What is the concentration (mol/L) of O2(g)? 2NO(g) = N2(g)+O2(g)
October 12, 2010

college chemistry
initial: I2 = 1.738 atm 2I = 0 change: I2 = -2x 2I = x equilibrium: I2 = 1.738 - 2x 2I = x so i set the equation as 0.254 = x/(1.738 - 2x) and i solved for x. i got 0.292 and after that how do i get % decomposition?
October 5, 2010

college chemistry
for the last time i did it*
October 5, 2010

college chemistry
i did.. it was wrong for the last time
October 5, 2010

college chemistry
please help! If the initial pressure of I2(g) is 1.738 atm, calculate the % decomposition of I2(g) when the reaction comes to equilibrium according to the balanced equation. The value of Kp at 1000 K is 0.254. The initial pressure of the reaction products is 0 atm. I2(g) = 2I(g)
October 5, 2010

college chemistry
wrong..
October 5, 2010

college chemistry
The value of the equilibrium constant, Kc, at a certain temperature is 4.00 x 10-1. Would the reaction as represented by the chemical equation favor reactants or products? Enter P or R. N2(g)+3H2(g) = 2NH3(g)
October 5, 2010

college chemistry
At 625 K the value of Kc for the equilibrium represented by the balanced equation is 2.50 x 100. Calculate the value of Kp at the same temperature. Express answer in scientific notation. 2NH3(g) = N2(g)+3H2(g)
October 4, 2010

college chemistry
The value of the equilibrium constant (Kp) as represented by the first chemical equation is 4.57 x 10-2 at 395 °C. Calculate the value of the equilibrium constant (Kp) for the second equation at the same temperature. Express answer in scientific notation. Cl2CO(g) = CO(g)+...
October 3, 2010

college chemistry
i don't understand..
October 3, 2010

college chemistry
If the initial concentration of F(g) is 8.285 mol/L, calculate the % decomposition of F(g) when the reaction comes to equilibrium according to the balanced equation. The value of Kc at 927.0 °C is 370.00. The initial concentration of the reaction products is 0 mol/L. 2F(g...
October 3, 2010

college chemistry
thank youu!
October 1, 2010

college chemistry
1) If 740. mL of 0.06622 M aqueous NaI and 370. mL of 0.07151 M aqueous Pb(NO3)2 are reacted stoichiometrically according to the equation, what mass (g) of NaI remained? Pb(NO3)2(aq) + 2 NaI(aq) → PbI2(s) + 2 NaNO3(aq) 2) If 180 mL of 0.581 M aqueous HCl and 690 mL of 0....
October 1, 2010

chemistry
If 740. mL of 0.06622 M aqueous NaI and 370. mL of 0.07151 M aqueous Pb(NO3)2 are reacted stoichiometrically according to the equation, what mass (g) of NaI remained? Pb(NO3)2(aq) + 2 NaI(aq) → PbI2(s) + 2 NaNO3(aq)
October 1, 2010

world history
is where we can get practice testss and stuff??',:I
May 19, 2010

Ms Sue + Dr Russ
thankyou to both of you for your help its helped me alot and i am so grateful.:)
November 25, 2009

history
i need to write an essay about General Haig include quotes from him,use examples from battle of the somme-how many casualties there were tactics used. thankyou
November 25, 2009

11th grade
A diamond contains 0.090 moles of carbon what is the mass of the diamond
November 17, 2009

Finance Math
On June 30, 2007, Simon Company discounted a customer’s $180,000, 6-month, and 10 percent note receivable dated April 30, 2007. A discount rate of 12 percent was charged by the bank. Simon’s proceeds from this discounted note would be: Please tell me how do i ...
July 9, 2009

year 8 history
please could someone help me. For my history assignment i need to design a poster about the british slave trade and write a letter to the king about the british slave trade. I also need some info. thanks for help
May 21, 2009

food technology
i need a recipe for italian stuffed peppers . using all italin ingredients thanks
October 29, 2008

dt -food
i need to research italy including a map food by different regions and include receipes on how to make pizzas lasagna and spaghetti bolognese. thanks guys !
August 11, 2008

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