Tuesday
July 22, 2014

Posts by chemistry


Total # Posts: 201

Chemistry
Calculate the volume of 2.00 M solution of KOH that is required to neutralize 30.0 mL of 1.00 M solution of HNO3.

chemistry
Find the Qsp when 5 mL of 0.17 M K2 CO3 (aq) and 1 L of 0.013 M AgNO3(aq) are mixed together. The solubility product of Ag2CO3 is 6.2 × 10−12

CHEMISTRY
Method for getting correct answer? Thank you! Initially there were equilibrium concentrations of 0.1887 M A, 0.1042 M B. Which of the equations below is correct if the pressure decreased by a factor of 2.40? Use the reaction below. 6A(g) ↔ 5 B(g) a. Qc = 0.42 Kc b. Qc = ...

CHEMISTRY
Thank you for the help!

CHEMISTRY
Method for getting correct answer? Thank you! The reaction below is an endothermic reaction. What would one have to do to shift the equilibrium to the right? SO2Cl2(g)↔SO2(g) + Cl2(g) a. Decrease the temperature b. Increase the temperature c. Remove some reactant d. An i...

CHEMISTRY
Thank you! .434^5 / .0786^6 equals .653, that is correct! I was just able to answer another problem similar to this thanks to your help. Many thanks!

CHEMISTRY
Method for getting correct answer? Thank you! Initially there were equilibrium concentrations of 0.1887 M A, 0.1042 M B. Which of the equations below is correct if the pressure decreased by a factor of 2.40? Use the reaction below. 6A(g) ↔ 5 B(g) Qc = 0.42 Kc Qc = 0.45 K...

CHEMISTRY
Method for getting correct answer? Thank You! What is Kp for the reaction below, if Kc = 1.13e-3 at 111.2°C? 4A(s) + 5B(g) ↔ 3C(g) a. 1.36e-5 b. 1.15e-12 c. 1.14e-6 d. 8.42e-3

CHEMISTRY
Method for how to get answer? Thank you! For the equilibrium reaction below. To what is Kc equal? N2(g) + 3H2(g) ↔ 2NH3(g) a. [N2] + 3[H2] ------------------ 2[NH3] b. [N2][H2]3 ------------------ [NH3]2 c. 2[NH3] --------------- [N2]+ 3[H2] d. [NH3]2 --------------- [N2...

CHEMISTRY
Method for getting correct answer? Thank you! What is the value of Kc at 226.85 °C for the reaction below if Kp is 6.24e-3 at this temperature? CO(g) + 2H2(g) ↔ CH3OH(g) a. 3.70e-6 b. 2.1614 c. 1.08e5 d. 10.5000

CHEMISTRY
Method for getting correct answer for this? Thank you! For the reaction A ↔ 2B K = 3.80x10-7 , if one started with 0.154 M A approximately how much A and B would there be after equilibrium had been established? a. very little A, 0.154 M B b. 0.126 M A; 0.027 M B c. 0.154...

CHEMISTRY
Method for getting correct answer for this? Thank you! A mixture containing an initial concentration of 0.1877 M for H2 and 0.1432 M for Cl2 is allowed to come to equilibrium (see reaction below). What must be the equilibrium concentration of HCl? H2(g) + Cl2(g) ↔ 2HCl(g...

CHEMISTRY
If an explanation for correct answer could be provided, that would be great! Which equilibrium constant indicates that the reaction will produce mostly products? a. Kc = 3.46x10-6 b. Kc = 1.96x10+7 c. Kc = 0.319 d. Kc = 0.37

CHEMISTRY
The initial concentration of PCl5 was 0.1983 M. It was allowed to decompose at some temperature until equilibrium had been attained (see reaction below). What must be the equilibrium concentration of PCl3? PCl5(g) ↔ PCl3(g) + Cl2(g) Kc = 0.0580 a. 0.1162 M b. 0.0496 M c....

CHEMISTRY
To what temperature would the reaction below need to be heated to have a rate constant of 8.474e-4 M-1s-1 if the rate constant was 2.7000e-4 M-1s-1 at 327.00°C and the activation energy was 166.000 kJ/mol? H2(g) + I2(g) ↔ 2HI(g) a. 609.24°C b. 336.09°C c. 348...

Aditya
Br2(l)+Cl2(g) (double arrow) 2BrCl(g) dH=+29.4 kJ/mol I am having trouble understanding this. Will the system shift left, right, or unchanged and why? a.Increasing Temp. b. Increasing pressure in flask by adding Ar. c. Increasing volume of flask d. Adding Br2(l)...is answer mo...

Chemistry
Calculate the number of grams of xenon in 3.566 g of the compound xenon tetrafluoride.

Chemistry
Calculate the formula mass for each of the following halogen compounds to five or more significant figures:? bake asked 5 months ago (a) NaIO3 (antiseptic) (b) CCl2F2 (former refrigerant)

Chemistry
Calculate the number of grams of xenon in 3.566 g of the compound xenon tetrafluoride.

Abby
how do i solve for Tf?

Abby
If you have 320.0 mL of water at 25.00 °C and add 140.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.

Pam
A 56.59 g sample of a substance is initially at 20.5 °C. After absorbing 1267 J of heat, the temperature of the substance is 116.5 °C. What is the specific heat (c) of the substance?

Lauren
Convert the following energy units. 905 kJ to J 2970 kcal to kJ 5.21 × 106 J to kcal

Chemistry
Electron exhibiting a particle wavelength of 5.2 x 10-9 are emitted from hydrogen atoms after interaction with high energy photons. Assuming that the electrons in the hydrogen atom were in their ground state prior to interaction, determine the wavelength of the photon which ge...

Idontgetit
The value of the equilibrium constant, Kc, at a certain temperature is 8.33 x 10-4. Would the reaction as represented by the chemical equation favor reactants or products? Enter P or R. Cl2CO(g) = CO(g)+Cl2(g)

Idontgetit
At 1650 °C the value of Kc for the equilibrium represented by the balanced equation is 2.38 x 10-1. Calculate the value of Kp at the same temperature. Express answer in scientific notation. CO(g)+H2O(g) = CO2(g)+H2(g) ___ x 10 ____

Idontgetit
At 565 K the value of Kp for the equilibrium represented by the balanced equation is 2.00 x 10-1. Calculate the value of Kc at the same temperature. Express answer in scientific notation. PCl3(g)+Cl2(g) = PCl5(g) ____ x 10 _____

Idontgetit
The value of the equilibrium constant, Kc, at a certain temperature is 2.56 x 10-1. If the reaction quotient for a mixture of these species at the same temperature is found to be 9.90 x 10-4, would the mixture yield more products, more reactants or is it at or near equilibrium...

Idontgetit
The value of the equilibrium constant, Kc, at a certain temperature is 2.50 x 102. If the reaction quotient for a mixture of these species at the same temperature is found to be 7.37 x 100, would the mixture yield more products, more reactants or is it at or near equilibrium? ...

Idontgetit
The value of the equilibrium constant, Kc, at a certain temperature is 2.56 x 10-1. If the reaction quotient for a mixture of these species at the same temperature is found to be 9.90 x 10-4, would the mixture yield more products, more reactants or is it at or near equilibrium...

Idontgetit
The value of the equilibrium constant (Kp) as represented by the first chemical equation is 2.00 x 10-2 at 730 K. Calculate the value of the equilibrium constant (Kp) for the second equation at the same temperature. Express answer in scientific notation. 2HI(g) = H2(g)+I2(g) H...

B
For a solution of 3.3 M H2CO3 (Ka = 4.4 × 10-7), calculate: (a) [H+] ____?______M (b) pH _____??______ (c) percent ionization ______?______%

organic chemisty
write raction of benzoic acid with propylamine

Alan
Mark below all of the statments that correctly describe the physical properties of glass. Glasses do not have slip systems. Glasses consist of both covalent and ionic bonding. Glasses are brittle at room temperature. Glasses are amorphous and have no long range symmetry. The v...

Chem
in a 0.01 M solution of 1.4 butanedicarboxylic acid, (Ka1=2.9x10^-5, Ka2=5.3x10^-6), which species is present in the lowest concentration?

Chemistry 104
What is the percent ionization of a solution prepared by dissolving 0.0286 mol of chloroacetic acid in 1.60 L of water? For chloroacetic acid ,Ka=1.4x10^-3

Chem
What is the equilibrium concentration of chloroacetic acid in a solution prepared by dissolving 0.0314 mil of chloroacetic acid in 1.10L of water? For chloroacetic acid, Ka= 1.4X10^-3

Chem
Hypobromous acid,HOBr, has acid -ionization constant of 2.5 X 10^-9 at 25 Celsius . What is the pOH of a 0.63 M HOBr solution? A4.40 B3.87 C5.20 D9.60 E10.13 I'm getting two answers between A or B

Chemistry
the hydronium ion concentration of a 0.050 M solution of a weak acid is 5.9 X 10^-3 M. the acid-dissociation constant is 1.37 X 10^-4 at 25 celsius. what is the pH of this solution? A. 0.077 B. 1.30 C. 2.23 D. 3.86 E. 5.13

12th science
How will you prepare potassium per magnate.

chemistry
Alexandra decides to climb Mt. Krumpett, which is 5000 high. She determines that this will require a total of 3600 of energy for the trip. For her food supply, she decides to take nutrition bars. The label states that each bar contains 50 of carbohydrates, 10 of fat, and 40 of...

Chemistry
How many grams of sucrose are needed to make 875 mL of a 39.0% (w/v) sucrose solution?

Chemistry
I have all of the answers but this one so if anyone knows this answer, i can trade you :) I tried using the formulas that were posted but i ended up with a weird answer that didnt work.... A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The ...

Mary
Can someone please tell me the heat of fusion for Lauric Acid, Oxalic Acid, and Cetyl Alcohol? I've looked and can't find them anywhere! Thanks!

Chemistry
The half-life of a first order reaction is determined to be 92.0 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?

Chemistry
Write equatios for the ionization of the following acids. (a)HF , (b)H2SO3 , (c)CH3COOH , (d)HNO3.

Jennifer
How to balance the following equation: I2 + Cl- = ?

Chemistry
THX SO MUCH!

Chemistry
yes

Chemistry
A solution of AuCl- is mixed with a solution of Sn2+ under standard conditions. What is the equation? the answer is 2AuCl4- + 3Sn2+ -> 3Sn4+ + 2Au + 8Cl- how do i get this? ITS desperate... plz help me! THANK_YOU SO MUCH!

Chemistry
THX!

Chemistry
What volume of 0.250M KOH is required to titrate 2.30 x 10^3 mol of the weak acid H2C2O4 ? I know the answer is 18.4, but can you show the process?

Chemistry
Explain the Hyberdaization scheme for the central atom&the molecular geometry of CO2.

Chemistry
A 53 mL sample of a solution of sulfuric acid is neutralized by 37 mL of a 0.18 M sodium hydroxide solution. Calculate the molarity of the sulfuric acid solution. Answer in units of mol/L

Chemistry
Calculate DeltaHrxn for the following reaction: C + H2O --> CO + H2 Use the following: C + O2 --> CO2 DeltaH = -393.5 kJ 2CO + O2 --> 2CO2 DeltaH = -566.0 kJ 2H2 + O2 --> 2H2O Delta H = -483.6 kJ DeltaHrxn = ?

cemistry
thx but wat is a good way to remember it

cemistry
how to identify bond angles

chemhelp
ok, thanks

chemhelp
?

chemhelp
could i use it safely at home

chemhelp
is LiCl toxic?

chemistry
what is the chemical balance equation for the following: Magnesium metal and hydrochloric acid copper matal and hydroshloric acid potassium hydroxide and acetic acid

chemexamples
where can I access this? and are they all good conductors

chemexamples
any more other than these that can be easily accessed

chemexamples
what are some good compounds(salts, acids,/bases) that are good conductors when dissolved in h2o

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.

chemistry help
out of the pairs of orbitals which has a higher amount of energy 4f or 6s

chemistry question
Not just Na I mean all group 1 and 2 elements

chemistry question
why is it that when an unknown carbonate of group one or two (inc H) reacting w/ HCl, the mole ratio is 1:1

Laboratory Techniques
Calculate the number of moles K2CO3 of and MgCl2 in the 15 ml aliquots of reagent solution

Steph
Buffers work by converting _____ to ____.

science
the teacher instructed three students A,B,and C respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH). 'A' dissolved 50 g of NaOH in 100 ml of water B dissolved 50g of NaOH in 100g of water while C dissolved 50g of NaOH in water to make 100...

Shawn
How many milliliters of 0.355 M NaF solution are needed to react completely with 24.6 mL of 0.216 M CaCl2 solution? How many grams of CaF2 will be formed? The reaction is CaCl2(aq) + 2NaF(aq) → CaF2(s) + 2NaCl(aq)

Helen
How do you know which elements are solids, liquids, and gases at STP?

CHEM
NVVVMMMM its 4

CHEM
What is the number of "UNBOUND" electrons in H2O...its not 0 or 2....is it 1??

chemistry
A 79.9-L sample of a gaseous hydrocarbon, measured at 1.00 atm pressure and 25.0°C, is burned in excess oxygen, liberating 4.24 × 10^3 kJ of heat at constant pressure. What is the identity of the hydrocarbon? (R = 0.0821 L · atm/(K · mol)) Substance H&d...

kassie
What is the major product of the reaction between methanol and (2R,3S)-2-bromo-3-methylpentane at room temperature?

chemistry
How do you write a redox reaction in an acidic environment for this? Cu^+2 + I- => CuI + I2 I understand that you get these equations for redox, but how do you put them in an acidic environment when there are no oxygens in the equation? 2I- => I2 + 1 electron 1 electron ...

HELP
Calculate the change in energy when 665.0 g of CH3OH(g) completely reacts at a constant temperature of 300 K and constant pressure of 0.95 atm. R = 8.314 J/mol*K and R = 0.08206 atm*L/mol*K So i used the formula change in energy = change in H - nRT 90.7-51.9-38.8 its wrong i n...

Prove trig identity
re write the question properly sec^2 x? is there something there? there should be either x or thetha there and is it multplied

Prove trig identity
randy re check the question and use brackets to identify do u mean secant squared? or secant to the power of 2x-1

Math
-3,-2,4 use the number line

Algebra 1
x=-2/3

chemistry
what would be a diagram that we can use to idenitify an unknown substance using electrochemical data. we have a reduction table and ksp values and we also that the substance is either bromine or iodine

Math
6y+-4x + y -x 7y -5x

7th Grade
7z + 5 = 21 7z=21-5 7z=16 z=16/7

11th grade
factor out 5 u get 5(4x^2+8x +3) = 0 5(4x^2+2x+6x+3)=0 5(2x(2x+1)+3(2x+1))=0 5(2x+1)(2x+3)=0 x=-1/2 or x=-3/2

chem
Excess fluorine, F2(g), reacts at 150°C with bromine, Br2(g), to give a compound BrFn. If 423 mL Br2(g) at 150°C and 748 mmHg produced 4.20 g BrFn, what is n? Predict the shape of this molecule using the VSEPR model.

chem
A molecular compound is composed of 58.8% Xe, 7.2% O, and 34.0% F, by mass. If the molecular weight is 223 g/mol, what is the molecular formula? Draw the correct Lewis structure. Predict the molecular geometry using the VSEPR model.

chem
A gaseous compound has the following composition by mass: C, 25.0%; H, 2.1%; F, 39.6%; O, 33.3%. Its molecular weight is 48 g/mol

chemistry
An ionic compound has the following composition (by mass): Mg, 10.9%; Cl, 31.8%; O, 57.3%. What is the formula and name of this compound?

chemistry
Consider the hypothetical elements X and Y. Suppose the enthalpy of formation for the compound XY is ƒ{336 kJ/mol, the bond energy for X2 is 414 kJ/mol, and the bond energy for Y2 is 159 kJ/mol. Estimate the XY bond energy in units of kJ/mol.

chemistry
What is the lattice energy of NaBr? heat of formation of NaBr = -362 kJ/mol heat of sublimation for Na = 107.30 kJ/mol ionization energy for Na = 496 kJ/mol bond dissociation energy for Br2 = 190 kJ/mol electron affinity of Br = -325 kJ/mol heat of vaporization for Br2 = 30.90...

chemistry
it worked now, thank you!

chemistry
9904.7 is the answer but I already tried that and its not working

chemistry
Given the reaction 3C(s) + 4H2(g) + 5O2(g) ---> 3CO2(g) + 4H2O(l) ÄH= -2323.7 kJ How much heat would be released when 34.1 g of H2 react?

Kelsie
name the element wsith the atomic number z= 15 and the atomic mass number 31. How many electrons does the neutral of this lement have? How many neutrons does the neutral atoms of this element have? I know the element with the atomic number of 15 and atomic mass of 31 is phosph...

tere
what did i do wrong? i need to find lowest vapor pressure. a 0.13 m FeCl3 b 0.50 m sucrose c 0.24 m NaNO3 d 0.15 m Na2PO4 so i solved. a 4 x 0.13 = 0.52 b 1 x 0.50 = 0.50 c 5 x 0.24 = 1.2 d 7 x 0.15 = 1.05 i chose C but the answer is A. did i do something wrong?

muah
using only words and no numbers how would i explain the steps necesarry to show how many kilograms are in a milligram? thanks :D

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