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# complete this table of initial and final concentrations.

Complete this table of initial and final concentrations HF(aq) KOH(aq) <-> KF(aq) H20(l) Initial concentrations: HF-2.0M KOH-1.0M KF-0M Final Concentrations?
34,046 results
Chemistry
Complete this table of initial and final concentrations HF(aq) + KOH(aq) KF(aq) + H20(l) Initial concentrations: HF-2.0M KOH-1.0M KF-0M Final Concentrations? how do I set this up to figure out the final concentrations? How can I tell which of the following

asked by Cat on July 16, 2013
Chemistry
Question : ka1 and ka2 values of H2X is given 1(10)^-5 M and 1(10)^-9 M.50cm^3 of 0.2 M KOH and 50 cm^3 of H2X of unknown concentration is mixed together and the pH of the final solution is given as 7. 1)Find the concentration of H2X 2)Find the pH of the

asked by Aanya on May 20, 2017
chemistry
Question : ka1 and ka2 values of H2X is given 1(10)^-5 M and 1(10)^-9 M.50cm^3 of 0.2 M KOH and 50 cm^3 of H2X of unknown concentration is mixed together and the pH of the final solution is given as 7. 1)Find the concentration of H2X 2)Find the pH of the

asked by To Aanya on May 21, 2017
chemistry 12
Equilibrium concentrations (a)(mol/L)// (b)(mol/L)// (c)(mol/L) 0.040 // 0.066 // 1.72×10^-2 0.080 // 0.017 // 8.8×10^-3 0.030 // 0.024 // 4.7×10^-3 My data was collected at 25○C for the reaction A(g) + B(g) = C(g) What i have to do now is involving

asked by Robyn on September 26, 2011
I completed a lab to find the determination of Kc. I have to find the concentrations of reactants at equilibrium using an ICE table. The equation that were are using is Fe^3+(aq) + SCN^-(aq) -> Fe(SCN)^2+(aq) I have to create 5 ICE tables because we used 5

asked by Hannah on March 4, 2012

I completed a lab to find the determination of Kc. I have to find the concentrations of reactants at equilibrium using an ICE table. The equation that were are using is Fe^3+(aq) + SCN^-(aq) -> Fe(SCN)^2+(aq) I have to create 5 ICE tables because we used 5

asked by Hannah on March 4, 2012
chemistry
For the reaction H2(g) + I2(g) ↔ 2 HI(g), you have the initial concentrations [H2] = 0.15 and [I2] = 0.05. Keq for the reaction at this temperature is 4.5 x 10-6. Make a reaction table. Include rows for initial concentration, change in concentration, and

asked by Anonymous on April 24, 2012
chemistry
For the reaction H2(g) + I2(g) ¡ê 2 HI(g), you have the initial concentrations [H2] = 0.15 and [I2] = 0.05. Keq for the reaction at this temperature is 4.5 x 10-6. Make a reaction table. Include rows for initial concentration, change in concentration,

asked by Anonymous on May 4, 2012
chemistry
For the reaction H2(g) + I2(g) ↔ 2 HI(g), you have the initial concentrations [H2] = 0.15 and [I2] = 0.05. Keq for the reaction at this temperature is 4.5 x 10-6. Make a reaction table. Include rows for initial concentration, change in concentration, and

asked by Anonymous on April 23, 2012
Chemistry
The reaction X + Y –> products was studied using the method of initial rates. The initial rate of consumption of X was measured in three different experiments. What is the value of the rate constant, k? *concentrations are in mol/L and initial rates are

asked by Jamie on February 23, 2011
I completed a lab to find the determination of Kc. I have to find the concentrations of reactants at equilibrium using an ICE table. The equation that were are using is Fe^3+(aq) + SCN^-(aq) -> Fe(SCN)^2+(aq) I have to create 5 ICE tables because we used 5

asked by Hannah on March 5, 2012
science
The equilibrium constant for the gas phase reaction N2O4 ⇀↽ 2 NO2 at a certain temperature is K = 0.0466. If the initial concentrations are [N2O4] = 1.0 M, [NO2] = 0.0 M, what are the final concentrations of [N2O4] and [NO2], respectively? 1. 1.0 M ;

asked by cora on February 1, 2016
augusta state
What is the final concentration of d at equilibrium if the initial concentrations are a = 1.00 and b = 2.00 ?

asked by e on March 2, 2013
Chemistry12
For the reaction NO2 + NO = N2O3 If at a particular temperature, K was 575 and the equilibrium concentration of N2O3 was 2.5M, calculate the equilibrium concentrations of NO2 and NO if they both had the same initial concentrations. I have this information

asked by Moriah on May 31, 2011
AP Chem
At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g) SO3(g) + NO(g) If all four gases had initial concentrations of 0.580 M, calculate the equilibrium concentrations of the gases.

asked by Bill on January 8, 2012

Chemistry
At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g) SO3(g) + NO(g) If all four gases had initial concentrations of 0.520 M, calculate the equilibrium concentrations of the gases

asked by Erin on May 5, 2010
Chemistry
At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g) SO3(g) + NO(g)\ If all four gases had initial concentrations of 0.550 M, calculate the equilibrium concentrations of the gases.

asked by Amber on March 27, 2011
tommy
At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g) SO3(g) + NO(g) If all four gases had initial concentrations of 0.870 M, calculate the equilibrium concentrations of the gases.

asked by CHEMISTRY on January 8, 2012
chemistry
At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g)= SO3(g) + NO(g) If all four gases had initial concentrations of 0.840 M, calculate the equilibrium concentrations of the gases.

asked by Enrique on January 15, 2009
Chemistry
HA(aq) H+(aq) + A-(aq) K = 5.0 x 10 -9 The initial concentration of HA is 0.30 M What is the final equilibrium concentrations of HA, H+, A-? Show work, solve if you can

asked by Kay on April 12, 2018
Chemistry
The following table contains data for the equilibrium reaction CH3COOH(g)+ C2H5OH(g)↔ CH3COOC2H5(g)+ H2O(g) T = 100oC. Each row in the table represents a different experiment (diffferent intial concentrations). Initial concentration Equilibrium

asked by Ava on September 24, 2009
Chemistry
For the reaction NO2(g) + NO(g) = N2O3(g) If at particular temperature, K was 575 and equilibrium concentration of N2O3(g) was 2.5 M, calculate the equilibrium concentrations of NO2(g) and NO(g) if they both had the same initial concentrations. i have my

asked by Sara on September 25, 2011
Chemistry
I have a question about buffers. Part A So it starts with 20ml 0.1 sodium acetate and 25ml 0.1 acetic acid. Calculate ph of buffer is 4.74 because the acid and conjugate base have the same molarity correct? So the Ph is just pKa (1.8e-5)? Part B So the

asked by Rio on March 31, 2010
Chemistry
At a particular temperature, K=3.75 for the following reaction. SO2(g) + NO2(g) (reversible arrows) SO3(g) + NO(g) If all four gases had initial concentrations of 0.500 M, calculate the equilibrium concentrations of the gases. K=(.5+x)^2/(.5-x^2) solve for

asked by Taasha on July 30, 2007
Chemistry
The following table shows how the initial rate of this reaction depends on the concentrations of the two reactants [NO] [O2] Initial rate 0.0050 0.0050 0.02 0.0050 0.0075 0.03 0.010 0.0075 0.12 Use the data to determine the order of reaction with respect

asked by Autumn on March 31, 2019

Physics
An ideal gas is contained within closed box behind a removable wall. The walls of the container are insulated, so that no heat may be transferred from the system. Initially, the gas has an initial pressure P and an initial temperature T. The gas is then

asked by Sam on July 20, 2014
chemistry
I have gotten the equilibrium concentrations of N202 to be 2M and N02 to be 2M also. After equilibirum is reached, a pistons is used to decrease the flask volume to 3L. Once equilibrium is established find the concentration and moles of each gas. K = 2 How

asked by A on October 9, 2008
College Chemistry 104
A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 C. The initial concentrations of Pb+2 and Cu+2 are 0.0500 M and 1.50 M, respectively. A. What is the initial cell potential? B. What is the cell potential when the concentration

asked by Samm on May 7, 2013
Chemistry
A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 C. The initial concentrations of Pb+2 and Cu+2 are 0.0500 M and 1.50 M, respectively. A. What is the initial cell potential? B. What is the cell potential when the concentration

asked by Samm on May 7, 2013
Physics
A car is traveling at 7.0 m/s when the driver applies the brakes. The car moves 1.5 m before it comes to a complete stop. If the car had been moving at 14 m/s, how far would it have continued to move after the brakes were applied? Assume the braking force

asked by Kayla on November 12, 2016
Chemistry
Experiment 1: A has .20 M, B has .20 M and the initial rate is 2.010^-4M/min Experiment 2: A has .20 M, B has .40 M, and the initial rate is 8.010^-4M/min Experiment 3: A has .40 M, B has .40 M, and the initial rate is 1.6*10^-3M/min Using the data

asked by Finn on August 20, 2015
Chemistry
Voltaic cell. The initial concentrations of Ni2+ and Zn2+ are 1.50 M and 0.100 M. Initial cell potential=.56 V. What are the concentrations of Ni2+ and Zn2+ when the cell potential falls to 0.45 V?

asked by Danielle on July 30, 2010
For the reaction, 2 SO2(g) + O2(g) == 2 SO3(g), at 450.0 K (Kelvin) the equilibrium constant, Kc, has a value of 4.62. A system was charged to give these initial concentrations, (SO3) = 0.254 M and (O2) = 0.00855 M, and (SO2) = 0.500 M. In which direction

asked by Hannah on March 3, 2012
College Chemistry
What are the concentrations of Pb2+ and Cu2+ when the cell potential falls to 0.370 V? Given: A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25degrees C . The initial concentrations of Pb2+ and Cu2+ are 5.30×10−2 M and 1.60 M,

asked by Maria on June 23, 2012
Chemistry, equilibrium molarity
At a particular temperature, K=3.75 for the following reaction. SO2(g) + NO2(g) (reversible arrows) SO3(g) + NO(g) If all four gases had initial concentrations of 0.500 M, calculate the equilibrium concentrations of the gases. This is what I’ve done so

asked by Taasha on July 31, 2007

Chemistry
H2 (g) + I2 (g) 2 HI (g) If the initial concentrations of H2 and I2 are 1.0 M and the initial concentration of HI is 0.5 M (Kc = 54.3 at 430oC). (a) Is the reaction at equilibrium? (b) If not, which way will the reaction proceed?

asked by Troy on May 4, 2014
rate of reaction
What is the initial rate of appearance of SO3(g)? a reaction and table are given: reaction: 2S02(g)+O2 ——-> 2 SO3(g) Table note: i= initial, IRD= initial rate of disappearance; concentrations given in molarity (M) IRD given in M/s. Experiment [SO2]i

asked by j on July 20, 2011
College Chemistry
Determine the concentrations of MgCl2, Mg2+, and Cl- in a solution prepared by dissolving 2.39 x 10^-4g MgCl2 in 2.50L of water. Express all three concentrations in molarity. Also display the concentrations of ionic species in part per million (ppm).

asked by Bailey on September 20, 2016
Chemistry
X2 + Y2 2XY 0.50 mole each of X2 and Y2 are placed in a 1.0 litre vessel and allowed to reach equilibrium at a given temperature. The equilibrium concentrations of XY is found to be 0.025 mol/L. What is the equilibrium cosntant for this reaction? Do I just

asked by Janna on May 15, 2007
Chemistry
2 ml of 1M HCl 0 ml of H2O 3ml of .3M Na2S2O3 How do I find the initial and final concentrations of both HCl and Na2S2O3?

asked by Nicole on January 7, 2013
Chemistry
2A(aq)-> B(aq) +C(aq) Initial concentration of A and B is 1.00 M, with no C. Kc = 0.200 find equilibrium concentrations

asked by Jordan on March 15, 2013
Chemistry
If Kc = 0.143 at 25°C for this reaction, find the equilibrium concentrations of C6H12 and CH3C5H9 if the initial concentrations are 0.200 M and 0.075 M, respectively. a. [C6H12] = 0.041 M, [CH3C5H9] = 0.041 M b. [C6H12] = 0.159 M, [CH3C5H9] = 0.116 M c.

asked by bob on January 30, 2011
Chemistry
Consider the equilibrium 2NOCl (g) 2NO (g) + Cl2 (g). In a 1 L container @ equilibrium there are 1.0 mol NOCL, 0.70 mol NO, and 0.40 mol Cl2. @ constant temperature and volume, 0.10 mol NaCl is added. What are the concentrations in the “new” equilibrium in

asked by Anna on April 13, 2013
chm
The equilibrium constant for the equation 2 H2(g) + CO(g) CH3OH(g) Is 19 at a certain temperature. If there are 3.11 x 10-2 moles of H2 and 5.79 x 10-3 moles of CH3OH at equilibrium in a 6.75 L flask. What is the concentration of CO? At 1280 °C the

asked by vikki on March 16, 2015
Chem
The apparent equilibrium constant for the reaction A + B 2C is Kc= 4.11 at 298.2 K. Given that the initial concentrations of A, B, and C are .10M, .10M, and zero, respectively, find the equilibrium concentrations of A, B, and C. I had this long, drawn out

asked by Chris on April 16, 2007

Chemistry
Kc=1. The initial concentrations are A = 0M, B = 0M, C=10M. A+B –> C calculate the reaction quotient. (c)/(a)(b) = 10/0 .. is the answer zero?

asked by Jenny on February 9, 2011
chemistry
Complete the folling reactions by writing the structures of the expected products & by naming the reactants & products HCl a) CH3COOCH3 + H20 —> ? NaOH b) CH3CH2CH2COOCH2CH2CH3 + H20 —> ? KOH C) HCOOCH2CH3 + H20 —> ?

asked by sarah on May 30, 2010
Chemistry/- Dr.Bob222
A voltaic cell consists of a Zn/Zn2+ half-cell and a Ni/Ni2+ half-cell at 25 C. The initial concentrations of Ni2+ and Zn2+ are 1.50 M and 0.10 M, respectively. a. What is the initial cell potential? My answer: 0.56 B b. What is the cell potential when the

asked by Nevaeh on June 2, 2016
Chemistry
Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ↔ SO2Cl2(g) Kp for this reaction is 5.1 x 10-2 atm-1. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L reaction vessel. After 15 minutes, the concentration of SO2Cl2 is 45.5

asked by JOhn Boku on February 22, 2015
Physical Science
why does the maximum initial reaction rate cannot be reached at low substrate concentrations.

asked by Ron on August 1, 2011
Chemistry
If the initial concentration of is 0.250 , and the reaction mixture initially contains no products, what are the concentrations of and after 80 ?

asked by Anonymous on February 28, 2010
Chemistry
A battery is constructed based on the oxidation of magnesium and the reduction of Cu^2+. The initial concentrations of Mg^2+ and Cu^2+ are 1.2*10^-4M and 1.5M, respectively, in 1.0-L half-cells. The initial voltage of the battery is 2.83V with the standard

asked by Emma on May 2, 2010
Chemistry
1.984 g of a hydrate of K2CO3 is dissolved in 250. mLs of H2O. 10.0 mLs of this solution is tirade against 0.100 M HCl, producing the following results. Flask 1 – Initial 0, final 9.2 Flask 2 – Initial 9.2, final 18.3 Flask 3 – initial 18.3, final 27.8

asked by Candice on January 12, 2015
Chemistry Problem
At 25 oC, Kc = 0.145 for the following reaction in the solvent CCl4. 2BrCl Br2 + Cl2 A solution was prepared with the following initial concentrations: [BrCl] = 0.0482 M, [Br2]= 0.0307 M, and [Cl2]= 0.0277 M. What will their equilibrium concentrations be?

asked by Peter on March 8, 2013
AP Chem
At 25 oC, Kc = 0.145 for the following reaction in the solvent CCl4. 2BrCl Br2 + Cl2 A solution was prepared with the following initial concentrations: [BrCl] = 0.0482 M, [Br2]= 0.0307 M, and [Cl2]= 0.0277 M. What will their equilibrium concentrations be?

asked by Peter on March 8, 2013

Chem
Hi! I need help with this question: Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ↔ SO2Cl2(g) Kp for this reaction is 5.1 x 10-2 atm-1. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L reaction vessel. After 15 minutes, the

asked by Anonymous on February 20, 2013
Chemistry
The reaction between NO (nitric oxide) and oxygen is a key step in the formation of acid rain. O2(g) + 2NO(g) → 2NO2(g) A series of experiments were run, each of which starts with a different set of reactant concentrations. From each experiment an

asked by Roman on March 27, 2012
chemistry
If the initial concentration of AB is .250 M, and the reaction mixture initially contains no products, what are the concentrations of A and B after 75s?of XY after 5.0 X10^1s?

asked by Ashton on February 21, 2010
college
1) You are given solutions of HCl and NaOH and must determine their concentrations. You use 37.0mL of NaOH to titrate 100mL of HCl and 13.6 mL of NaOH to titrate 50.0mL of 0.0782 M H2SO4. Find the unknown concentrations. Molarity of NaOH and molarity of

asked by Ashley on October 4, 2010
Chemistry
1) You are given solutions of HCl and NaOH and must determine their concentrations. You use 37.0mL of NaOH to titrate 100mL of HCl and 13.6 mL of NaOH to titrate 50.0mL of 0.0782 M H2SO4. Find the unknown concentrations. Molarity of NaOH and molarity of

asked by Ashley on October 4, 2010
chemistry
For each of the following solutions, calculate the initial pH and the final pH after adding 0.010 mol of HCℓ. a) 500.0 mL of pure water i’m not sure how to do this question.. would the equation be h20+h30 equilibrium arrows h30+h20

asked by help on December 1, 2010
Chemistry
I’m having trouble with the following question, any help would be greatly appreciated. A voltaic cell consists of a Zn/Zn^2+ half-cell and a Ni/Ni^2+ half-cell at 25 C . The initial concentrations of Ni^2+ and Zn^2+ are 1.30 M and 0.100 M , respectively.

asked by Rick on April 17, 2011
chem 12
1.00 mol of N2O4 and 1.00 mol of NO2 are placed in an 800 mL container. Calculate the initial concentrations of each gas. N2O4= 1.25 mol/L NO2=1.25 mol/L When equilibrium is reached, the concentration of NO2 increases by 0.50mol/L. Calculate the

asked by George on February 6, 2016
Chemistry
A mixture of .10 mol of NO, .050 mol of H2 and .10 mol of H20 is placed in a 1 liter vessel at 300 K. The following equilibrium is established. 2 NO + 2 H2 N2 + 2 H20 At equilibrium (N0) = .062 M. What are the equilibrium concentrations of H2 N2 and H20

asked by Thomas on March 29, 2010
Chemistry
A mixture of .10 mol of NO, .050 mol of H2 and .10 mol of H20 is placed in a 1 liter vessel at 300 K. The following equilibrium is established. 2 NO + 2 H2 N2 + 2 H20 At equilibrium (N0) = .062 M. What are the equilibrium concentrations of H2 N2 and H20

asked by Thomas on March 29, 2010

Chemistry
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different

asked by Amanda on March 19, 2014
CHEMISTRY
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different

asked by Amanda on March 19, 2014
Chemistry
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different

asked by Amanda on March 19, 2014
Chemistry
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different

asked by Nicole on March 19, 2014
CHEMISTRY
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different

asked by Amanda on March 20, 2014
Rate Law – Chemistry
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different

asked by Amanda on March 19, 2014
Chemistry II
At a certain temperature, Kc = 33 for the reaction: H2(g) + I2(g) 2HI(g) Assume that the initial concentrations of both H2 and I2 are 6.00 x 10-3 mol/L. Find the concentration of each reactant and product at equilibrium.

asked by Tiffany on February 22, 2011
Chemistry 112
4Nh3(g) +3O2(g)=2N2(g)+6H2O(g) has kp=2.1×10^6 atm. Initial concentration of NH3=2.00 atm, and N2=1.00 atm, with all other concentrations being zero. Compute final concentration of NH3.

asked by Dominique on September 19, 2011
Chemistry
To determine v max and km of Beta-galactosidase for lactose, the same amount of enzyme (1 ug per tube) was incubated with a series of lactose concentrations under conditions where product concentrations remained negligible. At each lactose concentration,

Science
To determine v max and km of Beta-galactosidase for lactose, the same amount of enzyme (1 ug per tube) was incubated with a series of lactose concentrations under conditions where product concentrations remained negligible. At each lactose concentration,

Chemistry
To determine v max and km of Beta-galactosidase for lactose, the same amount of enzyme (1 ug per tube) was incubated with a series of lactose concentrations under conditions where product concentrations remained negligible. At each lactose concentration,

chemistry
In a certain trial, the initial concentrations of Fe3+ and SCN- are both 1.00×10^-3 M and the initial concentration of FeSCN2+ is zero. Suppose that after the reation reaches equilibrium, the concentration of FeSCN2+ was found to be 1.19×10^-4 M. Use this

asked by Elly on June 20, 2011
Chemistry
What volume of 0.01 M NaOH should be required to raise the pH of a litre of 25 mM H2SO4 to 4.0? I started out by attempting to find the initial pH of H2SO4 and determined I need 2.57 units of pH to raise it to 4. I know that somewhere I use the HH

asked by Sara on September 22, 2013
Chemistry
How do I start an ICE table from the following information: BrCl3(g)+ Cl2(l) -> BrCl5(g) where Kp=7.8*10^-6 and there is originally 0.215 atm BrCl3, 725g Cl2, 0.115 atm BrCl5 – Can pressures be used as initial concentrations?

asked by Ken on October 2, 2012
Any chemistry lovers?
A voltaic cell consists of Mn/Mn2+ and Cd/Cd2+ half-cells with the following initial concentrations: [Mn2+] = 0.090 M; [Cd2+] = 0.060 M. A)What is the intital Ecell? B)What is Ecell when [Cd2+} reaches .050M. C) What is [Mn2+] when Ecell reaches 0.055V? D)

asked by stumped on May 4, 2008
CHEMISTRY
Ion Concentrations 1.) A solution is prepared by dissolving 5.00 g of stannic nitrate in enough water to make 250.0 mL of stock solution. A 15.0 mL aliquot (portion) of this stock solution is then removed and added to 75.0 mL of water. Calculate the

asked by Anonymous on October 25, 2013
Science (Chemistry)

1. A Beer’s Law plot was prepared for the reaction A(aq) + B(aq) AB(aq), plotting absorption over AB(aq) concentration. The linear equation for this plot was y = 78.3x. A solution was prepared by mixing 10.0mL of 0.100M A with 5.00mL of 0.100M B and

asked by Niharika on June 16, 2014
physiology (nernst equation)
If cell depolarises at +50mV, what are the concentrations of K+? I am really confused how to use the nernst equation to get the concentrations. If I set up 58 [Kout]/[Kin] = 50, will that be right? I am not sure how to start this problem.

asked by Anna on March 6, 2007
Physics
A model airplane is flying in a horizontal circle with a constant speed. The initial radius of the circle is R. The boy holding the cord to which the airplane is attached, then decides to increase the length of the cord so that the radius of the circle

asked by Sam on June 8, 2014
Physics
A model airplane is flying in a horizontal circle with a constant speed. The initial radius of the circle is R. The boy holding the cord to which the airplane is attached, then decides to increase the length of the cord so that the radius of the circle

asked by Sam on June 8, 2014

physics
A projectile is fired through the air. It is launched from the ground, and travels without interference from wind or air resistance, landing on a raised platform above the field. Compare the following values: 1-Initial speed vs. final speed: 2-Initial

asked by Din123 on June 23, 2013
general chemistry
Determine the concentrations of Na2CO3, Na , and CO32– in a solution prepared by dissolving 2.57 × 10–4 g Na2CO3 in 1.50 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts

asked by Anonymous on November 17, 2015
CHEMISTRY
Determine the concentrations of Na2CO3, Na , and CO32– in a solution prepared by dissolving 2.22 × 10–4 g Na2CO3 in 2.25 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts

asked by Hannah on February 26, 2017
Chem
Determine the concentrations of K2SO4, K , and SO42– in a solution prepared by dissolving 2.84 × 10–4 g K2SO4 in 2.25 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts per

asked by Jhanvi on February 19, 2013
CHEM
How can I calculate a pH of hypochlorite buffer into LiCLO with only initial concentrations and no Ka value? [CLO-]=.1M [LiCLO]=.1M

asked by Martin on April 13, 2013
ap chem
NH3 + H20 NH4+ + OH- this is aqueous solution. In 0.0180 M nH3, THE [OH-] is 5.60 X 10^-4 M. it is assumed that the volumes are additive. Determine the value of the base ionization constant, kb, for NH3. i am not sure how to approach this problem. i don’t

asked by rav on May 2, 2010
physics
I need help understanding these, please. Thanks! 1. A 2 kg body moves with constant velocity when a force of 10 N is applied. What is the coefficient of kinetic friction between the table and the body? (Would I use F=m*g for this??) 2. Which of the

asked by Ellie on October 4, 2015
Chemistry
Suppose that 30.0 mL of 0.20 M C6H5COOH(aq) is titrated with 0.30 M KOH(aq). Refer to table 1 and table 2. (a) What is the initial pH of the 0.20 M C6H5COOH(aq)? Using ICE i found to be 2.46 The rest I do not know how to set up or solve… (b) What is the

asked by Val on March 12, 2010
Chemistry
Use the concentrations and volumes of hydrogen peroxide and KI before mixing (Table 1), calculate the post-mixing concentrations. Before mixing: [H2O2] = 0.88M [KI] = 0.500M Table 1: before mixing 1. Vol H2O2 = 4.0 mL, [H2O2] = 0.88M 2. Vol KI = 1.0 mL,

asked by Amanda on February 28, 2017
Chemistry
The reaction 2H2S(g)⇌2H2(g)+S2(g) Kc=1.67×10−7 at 800∘C is carried out with the following initial concentrations: [H2S] = 0.300 M , [H2] =0.300 M , and [S2] = 0.00 M. Find the equilibrium concentration of [S2].

asked by hoooo on November 22, 2015

SCIENCE
THE VALUE OF KC=6.2 AT 750K FOR THE REACTION CO+H20 CO2.IF INITIALLY THE QUANTITIES OF CO AND H2O ARE 2 MOLES IN 1L.WHAT COULD BE THE EQUILIBRIUM CONCENTRATIONS FOR ALL CHEMICALS?

asked by NISHANT on February 25, 2013
chemistry
A solution of 0.178 M KOH(28.3 ml) is mixed with 28.9ml of 0.133 M HCl. Assuming that the final solution is the sum of the initial volumes, caculate: a)the molarity of the K+ cation b)the molatiry of the Cl- anion c)the pH of the final solution d)the pOH

asked by helen on February 8, 2012
chemistry 2
Calculate the relative concentrations of o-ethylbenzoic acid (pKa 3.79) and potassium o-ethylbenzoate that are needed to prepare a pH 4.0 buffer I know to set up hassle equation but when i get .21=log[a-/ha] i get lost because i was not given

asked by amber on July 28, 2013
Chemisrty
Assuming equal concentrations, rank these solutions by pH: hclo4 caoh2 NH3 koh hbro

asked by Carlos on March 5, 2016
college chemistry
For the following reaction: PCl5(g) PCl3(g) + Cl2(g) Kc=.058 If the initial concentration of PCl5(g) is .160M, calculate the equilibrium concentrations of all the components. (use quadratic)

asked by Jerrett on March 24, 2010 