# The equilibrium constant (Keq) is the ratio of ____ concentrations to ____ concentrations at equilibrium, with each concentration raised to a power equal to the number of ____ of that substance in the balanced chemical equation.

86,435 results, page 18

1. ### Science

The Richter Scale is based on measurements of the ____ of a seismic wave. A. Speed B. Frequency C. Intensity*** D. Amplitude
2. ### spanish II

Complete with the correct form of the indicated verb: Los alumnos ____ cuando la profesora habla. (dormir)
3. ### math

complete to show how you can find the sum by making a ten, hundred, or thousand. ex. 9 + 5= 9+1+____ 10+_____ ________
4. ### Math

Find the z-scores that bound the middle 55% of the standard normal distribution ____ small value _____ larger value
5. ### bca

____ is the code of acceptable behaviors users should follow while on the Internet; that is, it is the conduct expected of individuals while online.

Use implicit differentiation to find the slope of the tangent line to the curve at the point (1,3) -4x^2+4xy-2y^3=-46 m=____? ty guys so much!
7. ### English

Like adjectives, adverbs with one syllable form the ____ by adding -er to the positive. a. superlative b. attributive c. comparative d. appositive
8. ### spanish, again

(upside down question mark) Que ____ hacer tu y yo para su cumpleanos? a.puedo b.puedes c.podemos d.pueden Is it C?
9. ### Math

Find the z-scores that bound the middle 55% of the standard normal distribution ____ small value _____ larger value
10. ### check geo

the ____ was an age of exploration and artistic acheivement: A)reformation B)revolution C)renaissance D)romance my choice is b
11. ### Chemistry

If Kc = 0.450 at 40 degrees C and Kc = 0.545 at 90 C, what is the delta H for the reaction? X <---> Y ____ kJ would this problem include using a van hoff factor..?
12. ### Science HELP ASAP

when proteins are being produced by a cell, scientists say that the genes are ____? activated replicated***** turned off deactivated

Most of the enzymes of the Calvin cycle also function in other metabolic pathways. This should not be a surprising finding, because ____.
14. ### AP Chemistry

I'm so sorry to bother you guys again! Stuck on two other questions: 1. In the following equilibrium: NaCl(s) Na+(aq) + Cl–(aq), would adding more NaCl(s) increase the Cl-(aq) concentration? Explain why. My thoughts: I thought that it wouldn't increased the Cl- concentration...
15. ### chemistry

An ideal liquid solution has two volatile components. In the vapor in equilibrium with the solution, the mole fractions of the components are (a) both 0.50; (b) equal, but not necessarily 0.50; (c) not very likely to be equal; (d) 1.00 for the solvent and 0.00 for the solute. ...
16. ### chemistry

When N2O5 (g) is heated it dissociates into N2O3 (g) and O2 (g) according to the following reaction: N2O5 (g) <--> N2O3 (g) + O2 (g) Kc=7.75 at a given temperature. The N2O3 (g) dissociates to give N2O (g) and O2 (g) according the following reaction: N2O3 (g) <--> ...
17. ### Environmental Science

Nuclear fission ____ atoms to create energy A. Heats B. Corrodes C. Splits D. Combines A machine that converts electrical energy into mechanical energy is called a _____ A. Generator B. Solar Panel C. Windmill D. Motor Nuclear power plants use the radioactive element _____ to ...
18. ### Chemistry

23. In a chemical reaction, dynamic equilibrium occurs when the rate of the forward reaction becomes precisely equal to the rate of the reverse reaction. All of the following statements are true EXCEPT A. A dynamic equilibrium occurs when the reaction is more than 50 percent ...
19. ### chemistry

n one experiment, a mixture of 1.000 mol acetic acid and 0.5000 mol ethanol is brought to equilibrium. A sample containing exactly one-hundredth of the equilibrium mixture requires 28.80mL 0.1040M Ba(OH)2 for its titration. Calculate the equilibrium constant, , for the ethanol...
20. ### Chemistry

Determine the molar solubility of Y for XY2 if Ksp is 2.2x10^-4. The 2 in Xy2 is a subscript. I found the Ksp equation which is ksp=[x^2+][Y^-]^2 Then I did the ICE table and got x and 2x for the equilibrium concentrations. Then I did: 2.2x10^-4=(x)(2x)^2 I solved for x and ...
21. ### Chemistry

If 2.50 g of CuSO4 are dissolved in 9.4 102 mL of 0.34 M NH3, what are the concentrations of Cu(NH3)42+, NH3 and Cu2+ at equilibrium? i tried doing Cu2+ first and i did Kf=5e13= salt/cu2+ nh3+^4 and i did molesCuSO4/.94 L = .01666 M salt so then i did .01666M/[cu][.34-(4*....
22. ### chemistry

There is 0.150 moles of H2 and I2, and are brought to equilibrium in a 3.30 L flask. The equation is H2 + I2 = 2HI. Find the equilibrium amounts of H2, I2, and HI. I'm not getting the correct answer. I set up the formula as x^2/(.04545-x) (.04545-x). To get moles I multiplied ...
23. ### science

Which pairs of substances will form a buffer when mixed in equal concentrations?
24. ### Chemistry

1) Determine the equilibrium constant, Keq, at 25°C for the reaction 2Br– (aq) + I2(s) ⇌ Br2(l) + 2I– (aq) My wrong answer: 7.6e-10 2) Aluminum metal is formed by the electrolysis of Al2O3 in molten cryolite. How many minutes are required to form 15.6 g of Al using ...
25. ### Chemistry

Pure phosgene gas (COCl2), .03mole, was placed in a 1.5 L container. It was heated to 800k, and at equilibrium the pressure of CO was found to be .497 atm. Calculate the equilibrium constant Kp for the reaction CO(g) + Cl2(g) = COCL2(g)

Consider the reaction N2 + 3H2 in equilibrium with 2 NH3 . At 25°C Ho = -92.22 kJ and So = -198.53 J/K. Using this information, calculate the equilibrium constant for the reaction at 226°C. (R = 8.314 J/K) Enter your answer using TWO significant figures. You may use ...
27. ### Chemistry

Consider the following equilibrium process at 700°C: 2H2 + S2 ↔ 2H2S Analysis shows that there are 2.50 moles of H2, 1.35x10^-5 mole of S2, and 8.70 moles of H2S present in a 12.0-L flask. Calculate the equilibrium constant Kc for the reaction.
28. ### Chemistry

Pure phosgene gas (COCl2), .03mole, was placed in a 1.5 L container. It was heated to 800k, and at equilibrium the pressure of CO was found to be .497 atm. Calculate the equilibrium constant Kp for the reaction CO(g) + Cl2(g) = COCL2(g)
29. ### General Chemistry

At a certain temperature, the equilibrium constant for the following chemical equation is 2.90. At this temperature, calculate the number of moles of NO2(g) that must be added to 2.53 mol of SO2(g) in order to form 1.10 mol of SO3(g) at equilibrium. SO2(g)+ NO2(g) <> SO3...
30. ### Accounting

The following questions contain numbers and you have to do different things with the number in each question. I'm not sure of the steps to take to figure out each answer. And, when I try to do what the book shows me I come up with wrong answers. So if you could give me the ...
31. ### Organic Chemistry

Consider the weak organic base n-propylamine. The Kb value for this base is 1.3-10^-5, and its pKa is 10.6. At what pH are the "proton on" and "proton off" forms present in equal concentrations? At what pH values would the "proton on" form have the higher concentration? At ...
32. ### HJC

• For this assignment, you will view five examples of 20th Century paintings, one each of the following five schools of thought (the slides are labeled): o Impressionism o Expressionism o Abstract expressionism o Minimalism o Primitivism • Then, listen to five examples of ...
33. ### Math

The concentration C(t), in milligrams per cubic centimetre, of a certain medicine in a patient's bloodstream is given by C(t)= (0.1t)/(t+3)^2 where t is number of hours after the medicine is taken. Determine the maximum and minimum concentrations between the first and sixth ...
34. ### Chemistry

At a certain temperature, the equilibrium constant for the following chemical equation is 2.00. At this temperature, calculate the number of moles of NO2(g) that must be added to 2.64 mol of SO2(g) in order to form 1.10 mol of SO3(g) at equilibrium. SO2(g) + NO2(g) <--->...
35. ### chemistry

Write an equilibrium constant expression for the chemical reaction of ammonia with water. (In this reaction assume that the concentration of water will remain constant)
36. ### College Accounting

The following questions contain numbers and you have to do different things with the number in each question. I'm not sure of the steps to take to figure out each answer. And, when I try to do what the book shows me I come up with wrong answers. So if you could give me the ...
37. ### Bio Lab

You need to prepare medium for your culture cells. Your salt solution is 10x concentration, dilute to 1x for use. You also need to add fetal bovine serum for a final concentration of 10%. What would you add of each for the correct final concentrations in a liter of media?
38. ### college chemistry

You are given solutions of HCl and NaOH and must determine their concentrations. You use 38 mL of NaOH to titrate 100 mL of HCl and 23.2 mL of NaOH to titrate 50 mL of 0.0782 M H2SO4. Find the unknown concentrations.
39. ### chemistry

A STUDENT STUDYING THE FE+3- HSCN equilibrium put into a test tube 10.00ml of 2.00 x 10-3 M Fe(NO3)3 with 10.0 mL of 2.00 x 10-3 M HSCN.THE H+ in the resulting solution was manteined at 0.500.By spectrophotometric analysis of the equilibrium solution, the equilibrium ...
40. ### Chemistry

5.88 moles of nitrogen and 16.2 moles of oxygen are mixed until the equilibrium is established, 11.28 moles of nitric oxide are formed calculate the value of equilibrium constant
41. ### Chemistry

5.88 moles of nitrogen and 16.2 moles of oxygen are mixed until the equilibrium is established 11.28 moles of nitric acid are formed calculate the value of equilibrium constant
42. ### English

Word box: alias amble burly distort dogged dumbfounded extinct fossil grit inevitable ingrained meteoric parody prevail rend replenish rummage skimp sleuth vandalism 1.There is an old saying that nothing is really ____ except death and taxes inevitable 6.If you truly want to ...
43. ### Spanish

14. ¿Para qué deportes se necesita un balón? a. el futbol, el basquetbol y el hockey b. el tenis, el beisbol y el golf c. el futbol, el basquetbol y el futbol americano d. el futbol, los bolos y el golf Don’t both C and D require balls? .. 17. "¿Cómo estuvo la fiesta de...
44. ### Math (I've been on this problem for 3 hours)

If the supply and demand functions for a commodity are given by 2p - q + 10 = 0 and (p + q)(q + 10) = 3642 respectively, find the equilibrium price and quantity that give market equilibrium. (Round your answers to two decimal places.) Equilibrium price =
45. ### English

The mom left the room with a modicum of respect after her baby began ____. a) sleeping b) screaming c) talked d) singing B???
46. ### Chemistry 151

Of the following transitions in the Bohr hydrogen atom, the ____ transition results in the emission of the highest-energy photon. a.n=1, n=6 b.n=6, n=1 c.n=6,n=3 d.n=3,n=6 e.n=1,n=4
47. ### jake

The point (0,1) has the distance ____, from the line defined by y=-2x-1 How do you solve this? I tried the pythagorean theorem but I don't think I did it right as I came out with the square root of two. Can someone please explain this to me.
48. ### desktoping

To make it easy to quickly return to a favorite web site you can ____ it. A: Bookmark B: Bookshelf C: Copy D: Memorize I got A.
49. ### pharmacy math

15g of potassium chloride is diluted in 2L of sterile water for injection. What is the final perccent strength (w/v)? ____

As a general rule, homeowners should carry property damage insurance on their structures amounting to at least ____ percent of their value (the cost of rebuilding them). A. 50 B. 60 C. 70 D. 80
51. ### Math

Not sure how to ask my question? Need help on writing a formula for trapezoid A=h(B=+b) ____ 2 without parentheses and multiplication. Hope this makes sense. If it could be explained that would be great.
52. ### English

Sound Words. The___ of broken glass followed the ____ of the bullet as the rifle____ .The soldiers were awakened by the _____ of the bugle.

Because of ____,it may be legal to bribe other businesses and governmen officials in some south american countries,while this practice is still illegal in the u.s
54. ### Science

An electromagnet is ____. A. a permanent magnet B. made with bar magnets C. able to attract all metal substances D. only operating when the current is on I think it is D..?
55. ### Chemistry

The first electrochemical cell was invented by ____. Michael Faraday Alessandro Volta*** James Maxwell Benjamin Franklin
56. ### Pharmacy Math

15g of potassium chloride is diluted in 2L of sterile water for injection. What is the final perccent strength (w/v)? ____
57. ### Math

Find the unit rate. Enter your answer as a mixed number. A fertilizer covers 5/6 square foot in 1/2 hours. The unit rate is ____ square feet per hour.
58. ### chemistry

Calculate the value of the equilibrium constant (Kp) for the reaction displayed if the following equilibrium pressure data were measured at 25.00 °C: P(H2(g)) = 0.2282 atm, P(I2(g)) = 0.1646 atm, P(HI(g)) = 5.462 atm. H2(g)+I2(g) = 2HI(g)
59. ### Chemistry

5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: 2A(g) + B(g) --> 3C(g) At equilibrium, there is 4.8 x 10-5 mol of B. Calculate the value of the equilibrium constant.

5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: 2A(G) + B(G) <--> 3C(G) At equilibrium, there is 4.8 x 10-5 mol of B. Calculate the value of the equilibrium constant.
61. ### chemistry

I posted a question similar to this one a few days ago and someone helped me with it. but now im on a similar one and i did the same thing to find the answer but it was wrong. what am i doing wrong? An equilibrium mixture of the following reaction was found to have [CH4] = 0....
62. ### Chemistry

Which of the following is TRUE for a system that is in dynamic equilibrium? A) The forward reaction goes to 100% completion. B) The concentration of products is equal to the concentration of the reactants. C) The reaction rate of the forward reaction approaches zero. D) Both ...
63. ### Chemistry

Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) <-> PCl3(g)+Cl2(g) Kc=1.80 at 250 degrees Celsius A 0.222 mol sample of PCl5(g) is injected into an empty 3.25 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and ...
64. ### physics

A horizontal spring attached to a wall has a force constant of 800 N/m. A block of mass 1.10 kg is attached to the spring and oscillates freely on a horizontal, frictionless surface as in the figure below. The initial goal of this problem is to find the velocity at the ...
65. ### Social Studies

Multiple Choice ____ raised 12 sons, who became the 12 tribes of Israel. A. Cyrus B. **** Jacob C. Abraham D. Moses ============== Who led the Israelites out of Egypt and into the Sinai Desert? A. Jacob B. ********* Moses C. the Maccabees D. Pharaoh ========= How long did it ...
66. ### Chemistry

Calculate the value of the equilibrium constant (Kc) for the reaction shown, if NO2(g) was found to be 95.54 % decomposed at 45.00 °C when its initial concentration was 5.725 mol/L. The initial concentration of the reaction products is 0 mol/L. 2NO2(g) = N2O4(g)
67. ### Chem

Please tell me if these are right. 1.According to Le Chatelier’s principle, what is the effect on the products when N2 is added to the equilibrium mixture of each of the following reactions? a. 2NH3(g) < = > 3H2(g) + N2(g) B. N2(g) + O2(g) <= > 2NO(g) C. 2NO2(g)&...

Please tell me if these are right. 1.According to Le Chatelier’s principle, what is the effect on the products when N2 is added to the equilibrium mixture of each of the following reactions? a. 2NH3(g) < = > 3H2(g) + N2(g) B. N2(g) + O2(g) <= > 2NO(g) C. 2NO2(g)&...
69. ### Spanish

33. "¿Quieres ayudarnos a _______ periódicos?" "No puedo. Tengo que estudiar esta tarde." a. ganar b. soler c. repartir d. desayunar C 35. "Tienes mucha hambre, ¿verdad?" "Claro que sí. Voy a comer ____ dos hamburguesas." a. según b. sin c. antes de d. por los menos D 36...
70. ### micro economics

1) Assume that the gold-mining industry is competitive. a) Illustrate a long-run equilibrium using diagrams for the gold market and for the a representative gold mine. b) Suppose that an increase in jewellery demand induces a a surge for in the demand for gold. Using your ...
71. ### math

I'm going over my 4th grader's homework. She has place value math problems. I'm having a problem with this question. In the number 3,024,456, the value of 4 in the hundreds place is _____ times ____ than the value of the other 4. My answer 100 times less than the value of the ...
72. ### CHEMISTRY

Assuming equal concentrations , rank these solutions by pH. RbOH(aq), NH3(aq), HF(aq) HBr(aq), Ca(OH)2(aq).
73. ### General Chemisty

2. Calculate the value of the equilibrium constant (Kc) for the reaction shown, if NO2(g) was found to be 95.54 % decomposed at 45.00 °C when its initial concentration was 5.725 mol/L. The initial concentration of the reaction products is 0 mol/L. 2NO2(g) = N2O4(g)
74. ### Chem Equilbirum

SO2(g) + NO2(g) reverse reaction arrow SO3(g) + NO (g) At a given temperature, analysis of an equilibrium mixture found [SO2] = 4.00 M, [NO2] = 0.500 M, [SO3] = 3.00 M, and [NO] = 2.00 M. ---How many moles/liter of NO2 would have to be added to the original equilibrium mixture...
75. ### Chemistry 112

4Nh3(g) +3O2(g)=2N2(g)+6H2O(g) has kp=2.1x10^6 atm. Initial concentration of NH3=2.00 atm, and N2=1.00 atm, with all other concentrations being zero. Compute final concentration of NH3.
76. ### Chemistry

. For the gas reaction at low pressure 2NOBr ¡ê 2NO + Br2 ¥ÄH = +61.1 kJ which of the following statements are true? a) Adding more Br2 shifts reaction to the right b) Removing some NOBr shifts reaction to the left c) Increasing temperature shifts reaction to the right d) ...
77. ### 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 concentrations of all ions ...
78. ### Physic energy conservation

A 5 kg mass attached to a spring passes its equilibrium point moving at 390 m/s. If the spring constant is 1450 N/m, what is the maximum displacement of the spring from its equilibrium position?
79. ### Chemistry

SO2(g) + NO2(g) reverse reaction arrow SO3(g) + NO (g) At a given temperature, analysis of an equilibrium mixture found [SO2] = 4.00 M, [NO2] = 0.500 M, [SO3] = 3.00 M, and [NO] = 2.00 M. ---How many moles/liter of NO2 would have to be added to the original equilibrium mixture...
80. ### Chemistry

When solid CO2 (dry ice) is allowed to come to equilibrium in a closed constant volume container at room temperature (300K), 1. the pressure rises until it reaches 1 atm 2. the pressure rises until a liquid-gas equilibrium is reached. 3. the pressure does not change. 4. the ...
81. ### Spanish

1 of 15 I tried to get there on time, but there was an accident on the freeway: Yo ____(1)____ llegar a tiempo, pero ____(2)____ un accidente en la autopista. Options 1-quise or queria 2-hubo or habia Answers 1- quise 2 -habia 2 of 15 They refused to admit that you already ...
82. ### Physics 203

A block with mass of 5.0kg is suspended from an ideal spring having negligible mass and stretches the spring 0.20m to its equilibrium position. A) What is the force constant of the spring? B) The spring is then stretched 0.80m from its equilibrium position and then released ...
83. ### econ

Consider the following data about the goods market in a hypothetical closed economy. Assume that government expenditure is constant at \$200 million. Also assume that there is equilibrium in the goods market at all times. Some of the pairs of interest rate and aggregate output ...
84. ### econ

Consider the following data about the goods market in a hypothetical closed economy. Assume that government expenditure is constant at \$200 million. Also assume that there is equilibrium in the goods market at all times. Some of the pairs of interest rate and aggregate output ...
85. ### chemistry

The correct interpretation of the equation below is: Fe3+(aq) + SCN–(aq) --> and <-- FeSCN2+(aq) A. A heterogeneous equilibrium exists because of the charged ions. B. At equilibrium, the rate of the forward reaction equals the rate of the reverse reaction. C. The ...
86. ### chemistry

The correct interpretation of the equation below is: Fe3+(aq) + SCN–(aq) --> FeSCN2+(aq) A. At equilibrium, the rate of the forward reaction equals the rate of the reverse reaction. B. The equilibrium constant is Kc = [Fe3+][SCN–][FeSCN2+] C. A heterogeneous equilibrium...
87. ### AP CHEMISTRY

The equilibrium constant for the reaction PCl3(g) + Cl2(g) ⇀↽ PCl5(g) is 35000 at 760 ◦C. At equilibrium, the partial pressure of PCl5 was 150 bar and that of PCl3 was 8.12 bar. Calculate the equilibrium partial pressure of Cl2. Answer in units of bar. I got ...
88. ### Chemistry

My question is ..can anyone explain how to do problem #2? I feel lost. :( And could you also explain why? Problem#1, is that a regular dG = dH - TdS problem? Then using Go = -RTlnK to find K? Im just afraid if there are other seps to it.. 1. The combustion of butane has the ...
89. ### Chemistry

For the reaction system, 2 H2O(g) + O2(g) == 2 H2O2 (g), the equilibrium concentrations are (H2O2) = 0.120 M; (H2O) = 0.860 M; (O2) = 0.330 M. Calculate the value of Kc for this reaction. A. 0.423 B. 0.872 C. 0.0590 D. 1.31 E. 2.51 I did 0.120 / 0.860 X 0.330 = 4.4228 = 4.23. ...
90. ### chemistry

The correct interpretation of the equation below is:? Fe3+(aq) + SCN¨C(aq)¡ú FeSCN2+(aq) A. The reaction is incomplete because the product is still charged. B. A heterogeneous equilibrium exists because of the charged ions. C. The equilibrium constant is Kc = [Fe3+][SCN¨C...
91. ### Chemistry

voltaic cells in non-standard conditions, how does concentration of solm's effect the value of Ecell. I understand that as concentration increases so does the E-cell value but why? The half cell is E = Eo - 0.0592 log Q where Q stands for K at equilibrium and K = (ox)/(red). ...
92. ### Accounting

____ 2. As part of the initial investment, Omar contributes accounts receivable that had a balance of \$25,000 in the accounts of a sole proprietorship. Of this amount, \$1,150 is completely worthless. For the remaining accounts, the partnership will establish a provision for ...
93. ### Chemistry

Calculate the number of molecules in 540cm square of hydrogen gas(H=1,O=16,Avogadro's constant=6.02 x 10 raised to power 23)
94. ### Physics ideal gases

If 2 samples of nitrogen (different PVTs) are separated by a conductive barrier, they will eventually achieve equilibrium, I believe. Am I right to assume that the final T and P at equilibrium in this case would be the SAME T and P if the barrier was highly insulated, then ...
95. ### Spanish

Pablo Picasso ____ de España, pero vivió en Francia por muchos años. A.Estuvo B.Es C.Era D.Está
96. ### English 4

In “The Rocking-Horse Winner,” Paul's ability to predict winning horses is ____. A. discreet B. brazening C. uncanny D. remonstrated A ?
97. ### music

the ____ is an essential characteristic of sonata form a. sudden crescendo b. absence of harmony c. fluctuation of rhythm d. development of themes
98. ### Social studies

The Renaissance shifted the direction of learning to reflect the ideals of ____? Humanism. (MY ANSWER) Revolution. Conservation. Communism.
99. ### science

In a device known as a ______ electrons are emitted when light shines on a metal surface? a difference in charge is called a ____ I am so stuck on these last two
100. ### Government

In 1938, President Cardenas of Mexico oversaw the ____ of all United States oil companies in his country, acquiring them for public use.