# 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 19

1. ### Management

When examining the average salary of a job, it is advisable to consider the size of the companies used in the analysis and apply the ____ statistic to calculate the appropriate amount.
2. ### math

Referring to the figure, think about first picking a card and then rolling the die. Give the probability in simplest form. P(A, 1) = ____ i am confused with this problem.. please help?
3. ### ENGLISH

IN " THE BELLS," POE USES ____- TO CREATE A STRONG EFFECT. A) ASSONANCE B) INTERNAL RHYME C) ONOMATOPEIA C) COUPLETS. MY ANSWER IS (C). AM I CORRECT?
4. ### math

Sorry my mistake. i had typed up the wrong question mr.bobpursley. What I meant to say was 66 2/3% of ____ = 74. I still can't understand how to figure this out? It is done exactly as I stated. I changed 66 2/3 percent to a fraction 2/3.
5. ### vocabulary

The mom left the room with a MODICUM of respect after her baby began ____ . a) sleeping b) screaming c) praying d) singing b is that correct
6. ### vocabulary

The mom left the room with a MODICUM of respect after her baby began ____ . a) sleeping b) screaming c) praying d) singing b is that correct

For the following reaction, it is found at equilibrium at a certain temperature that the concentrations are [CO(g)] = 2.7 multiplied by 10-4 M, [O2(g)] = 1.9 multiplied by 10-3 M, and [CO2(g)] = 1.1 multiplied by 10-1 M. 2 CO(g) + O2(g) reverse reaction arrow 2 CO2(g) ...
8. ### Spanish

Hola! Can you please check my work to see if it's correct or not? Muchas gracias! Escoja la forma correcta del verbo para traducir cada oración al español. 1. I tried to get there on time, but there was an accident on the freeway: Yo ____(a)____ llegar a tiempo, pero ____(b)...
9. ### chemistry

HF acid ionization constant (Ka) is 3.5 X 10-4. In a solution of HF acid @ equilibrium [H+] = 0.090 M. What is the concentration of F-?
10. ### Chemistry

The reaction O2 ⇄ 2 O has a K=1.2x10-10. If a 1.7 L container holds 3.8 moles of O atoms (and nothing else), what will the concentration of O be when equilibrium is reached? So far, I have 1.2x10^-10 = 2.2^2 / 0 but I don't know how to do the rest. When it says "when ...
11. ### Chemistry

The reaction O2 ⇄ 2 O has a K=1.2x10-10. If a 1.7 L container holds 3.8 moles of O atoms (and nothing else), what will the concentration of O be when equilibrium is reached? So far, I have 1.2x10^-10 = 2.2^2 / 0 but I don't know how to do the rest. When it says "when ...
12. ### Chmistry

pcl3(g) cl2(g) ¨ <--- pcl5(g) Energy Some PCl3 and Cl2 are mixed in a container at 200 degrees celius and the system reaches equilibrium according to the equation above. Which of the following causes and increase in the number of moles of PCl5 present at equilibrium? I. ...
13. ### Math

Solve the mathematical puzzle. Determine the digits of R from these clues. The first digit is the answer when the third digit is divided by 2. The second and third digits add to 7. The second digit minus the first digit is 1. R is a three-digit number: ____ I have never ...
14. ### Calculus

What is wrong with the following reasoning??? f(x) = 2^x f'(x) = x[2^(x-1)] Although n x^(n-1) is the derivative of x^n, you cannot apply similar rules when x is the exponent and the number being raised to a power is a constant. The derivative of b^x, where b is a constant, is...
15. ### Microeconomics

If the equilibrium price of silver is 4 dollars an ounce, under conditions of perfect competition and the industry is in long run equilibrium, will the average total cost of silver be less, equal or exceed 4 dollars?
16. ### chemistry

. For the gas reaction at low pressure 2NOBr ↔ 2NO + Br2 ΔH = +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 ...
17. ### Chemistry

1. Regarding solutions and solids, which statement is true? A. If the solvent is water, the crystal lattice energy of a solid is absorbed. B. Hydration energy is related to the attractions between solute particles. (My Answer) C. If the solvent is water, the crystal lattice ...
18. ### Chemistry

10g of NOBr were added to a 5L flask and the temperature was fixed to 350K. The following equilibrium is reached : NOBr(g)=NO(g)+1/2Br2(g);The pressure measured at the equilibrium was 0.63 atm.Determine Kp and Kc. I need help to solve this problem.I already done 50% but at the...
19. ### Chem II - Equilibrium

For the reaction at 430 degree C, H2 + I2 <=> 2HI Kc = 54.3. Initially 0.714 moles of H2 and 0.984 miles of I2 and 0.886 moles of HI are placed in a 2.40 L vessel. The equilibrium concentration of H2 and I2 are _____. Ok, I tried this by changing the moles to M by ...
20. ### Chemistry Equilibrium

At 200 °C, Kc = 1.4 x 10-10 for the reaction N2O(g) + NO2(g) 3NO(g) If 0.174 mol of N2O and 0.337 mol NO2 are placed in a 4.00 L container, what would the NO concentration be if this equilibrium were established?
21. ### managerial economics

Suppose the inverse market demand equation is P = 80 ¡V 4(QA+QB), where QA is the output of firm A and QB is the output of firm B, and both firms have a constant marginal constant of \$4. Firm B is the Stackelberg leader in this market. (a)State the reaction function for firm ...
22. ### Chemistry

At 35 degrees Celcius, K = 1.6x10^-5 for the reaction: 2NOCl<--> 2NO + Cl2 If 2.0mol NOCl and 1.0mol Cl2 are placed into a 1.0-L flask, calculate the equilibrium concentrations of all species. Answer: [NOCl] = 2.0M [NO] = 8.0x10^-3 [Cl2] = 1.0M --------- What I did: ...
23. ### Chemistry

What concentration of Ag is in equilibrium with 1.4 × 10^-6 M Co(CN)63– and Ag3Co(CN)6(s)? The solubility constant of Ag3Co(CN)6 is 3.9 x 10^-26
24. ### science

Nitrate concentrations exceeding 44.3 mg NO3-/L are a concern in drinking water due to the infant disease, methemoglobinemia. Nitrate concentrations near three rural wells were reported as 0.01 mg NO3- N/L, 1.3 mg NO3- N/L, and 20.0 mg NO3- N/L. Do any of these three wells ...
25. ### chemistry

Haber process at 127C: 1N2 + 3H2 -----> 2 NH3 [NH3] @ equilibrium= 0.031M [N2] @ initial =0.85 M [H2] @ initial =0.0031 M Calc Keq for the reaction. This is how I did it: 1N2 + 3H2 -----> 2 NH3 i:0.85 0.0031 0 c: -X -3X +2X e: 0.85-X 0.0031-3X 0.031=2X X=0.0155 Keq= ([0....
26. ### Chemistry

1) Frank and Oswalt report a molar absorptivity of 4700 L mol^-1 cm^-1 for thiocyanatoiron(lll) ion. What absorbance would you expect for a soloution that it 1.0e-4 M in thiocyanatorion(lll) ion, if the path length is 1.00 cm? 2) At a given temperature, the equilibrium ...
27. ### AP CHEMISTRY

A voltaic cell is constructed that uses the following half-cell reactions. Cu+(aq) + e− -> Cu(s) I2(s) + 2 e− -> 2 I−(aq) The cell is operated at 298 K with [Cu+ ] = 2.7 M and [I− ] = 2.7 M. (a) Determine E for the cell at these concentrations. (b...
28. ### AP CHEMISTRY

A voltaic cell is constructed that uses the following half-cell reactions. Cu+(aq) + e− -> Cu(s) I2(s) + 2 e− -> 2 I−(aq) The cell is operated at 298 K with [Cu+ ] = 2.7 M and [I− ] = 2.7 M. (a) Determine E for the cell at these concentrations. (b...

1) Which of the following statements is/are CORRECT? 1. Naturally occurring isotopes account for only a small fraction of known radioactive isotopes. 2. A few radioactive isotopes with long half-lives, such as U-235 and U-238, are found in nature. 3. Trace quantities of some ...
30. ### chemistry

I have the 1st part of the answer to my question I guess what I don't understand is the 2nd part of the question. I am supposed to 1. predict how ke increases in temperature, 2. predict how equilibrium will shift when pressure is decreased and 3. predict how equilibrium will ...
31. ### Physics

A platform of mass 0.83 kg is supported on four springs (only two springs are shown in the picture, but there are four altogether). A chunk of modeling clay of mass 0.65 kg is held above the table and dropped so that it hits the table with a speed of v = 0.91 m/s. The clay ...
32. ### Physics

What is an equilibrant? (Points : 1) an object that has zero net force acting on it two chemical reactions proceeding at the same rate in opposite directions a force that makes the net force on an object zero a force in the same direction as the net force Question 2. 2. How is...
33. ### Chemistry

I had an equilibrium laboratory and had to answer a few questions after the lab. Here are 2 questions I can't seem to know how to answer. 1. Explain in your own words why a saturated solution in contact with some undissolved solid is considered to be an equilibrium situation? ...
34. ### Math

-I am 2 digit number. -The digit in the ones place is the first odd prime number -The digit in the tens place is three times the value of the ones place digit I am ____
35. ### AP CHEMISTRY

A) At 800 K the equilibrium constant for I2(g) <=> 2 I(g) is Kc = 3.1 10-5. If an equilibrium mixture in a 10.0-L vessel contains 3.44*10-2 g of I(g), how many grams of I2 are in the mixture? answer is .060g B)For 2 SO2(g) + O2(g)<=> 2 SO3(g), Kp = 3.0*104 at 700 K...
36. ### Chem

given the reaction: agcl(s) +2nh3 (aq) <--> ag (nh3)2 +(aq) + cl^- (aq). if more ammonia, nh3 is added to the system at equilibrium the a) amount of agcl increases b) system cannot achieve equilibrium c) rate of the forward reaction decreases d) concentration of cl^- ...
37. ### Chemistry

The formation constant of [M(CN)6]4– is 2.50 × 1017, where M is a generic metal. A 0.170-mole quantity of M(NO3)2 is added to a liter of 1.31 M NaCN solution. What is the concentration of M2 ions at equilibrium?
38. ### Chemistry

The formation constant of [M(CN)4]^-2 is 7.70 × 10^16, where M is a generic metal. A 0.150-mole quantity of M(NO3)2 is added to a liter of 0.840 M NaCN solution. What is the concentration of M2 ions at equilibrium?
39. ### chemistry

The formation constant of [M(CN)6]4– is 2.50 × 1017, where M is a generic metal. A 0.170-mole quantity of M(NO3)2 is added to a liter of 1.51 M NaCN solution. What is the concentration of M2 ions at equilibrium?
40. ### 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 110 bar and that of PCl3 was 9.98 bar. Calculate the equilibrium partial pressure of Cl2. Answer in units of bar
41. ### chemistry

for the reaction H2+I2--2HI at a given temperature it was found that an equilibrium mixture in a 10mL container consisted of 8.0 mol of HI, 1.0 mol of H2 nd 1.0 mole of I2. what is the equilibrium constant at that temperature?
42. ### physics

A block with a mass of 0.306 kg is attached to a spring of spring constant 444 N/m. It is sitting at equilibrium. You then pull the block down 4.50 cm from equilibrium and let go. What is the amplitude of the oscillation?
43. ### physics

Hi! could anyone help me with this question please, I really don't know how to do this at all. Thank you so much. Question:A 330 turn solenoid with a length of 21.0 cm and a radius of 1.40 cm carries a current of 2.10 A. A second coil of four turns is wrapped tightly around ...
44. ### PHYSICS (HELP!!!)

An object of mass m=80 kg moves in one dimension subject to the potential energy U(x)=λ4(x2−a2)2+b2x2.(1) Here we use λ= 9 kg/(m2s2), a= 9 m, and b= 719 kg/s2. (a) How many equilibrium points (stable and unstable ones) does this potential have? n= 1 2 3 4 5? (b...
45. ### Chemistry

The fluoride ion concentration in a saturated solution of magnesium fluoride, MgF2, is 2.3 10-3 M. Calculate the value for the equilibrium constant.
46. ### chemistry

Wrtie the equilibrium constant expression for the reaction of NH3 with water. the OH- concentration of .050 M ammonia, NH3, is 9.5 x 10^-4 M
47. ### english

Its the book "My Father Writes To My Mother" The author senses the ____ of the union of a man and a woman.   shame mystery importance requirement
48. ### health

A function of the female reproductive system is to provide a nourishing environment in which fertilized ____ can grow A.Ovary B. Sperm*** C.Egg D.Uterous
49. ### Scoial Studies

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
50. ### MATH

HEART BEATS ABOUT 72 TIMES PER MINUTE... IN A 30 DAY MONTH?____ IN A YEAR?_____ IN YOUR LIFETIME, IF YOU LIVE TO 72 YEARS OF AGE?________________
51. ### Social Studies

Advances in all of the following except ____ have led to rapid population growth in recent years. A. Sanitation B. Farming Methods C. Medicine D. Computers
52. ### spanish - HELP!

Fill in the blank with the correct direct object pronoun, based on the word in parentheses that best complete this sentence Tu ____ buscas. (nosotros) I need help with this!
53. ### science

____ make up the largest group of arthopods. a.)Cnidarians b.)Arachinds C.)insects d.) Cephalopods i read the whole chapter in my book but it doesn't say ~thankyou

Features alone ralely motivate readers. Instead, link the feature to the audience's ____ and proide details to make the benefit vivid.
55. ### English

Type the correct personal pronoun in place of the noun or nouns in parentheses. I'm not sure it's a good idea to give the candy to (the children) ____? .
56. ### Math

Use the formula to solve the problems. B × In The amount that results when \$6,000 is compounded at 7% annually over eight years=____ The interest earned in this case= ___
57. ### Physical Science

Hello! Thanks for checking my question out! ____ 2. Milk is an example of a (1 point) a) solution. b) homogenous mixture. c) colloid. d) compound. My Answer: C Could someone please check if I'm right? Thanks! - Da Fash
58. ### the periodic table

combine the chemical symbols for each of the following elements to spell words. carbon +argon =____.chlorine + oxygen +selenium=----+---- +----- =------ .i have 10 questions like these .please help me
59. ### Chemistry

What are the moles of substances present at equilibrium at 450C if 1 mol N2 and 4 mol H2 in a 10 L vessel react according to the following equation? N2 (g) + 3H_2(g) ⇌ 2NH_3 (g) The equilibrium constant Kc is 0.153 at 450C. Thanks a lot.
60. ### chemistry

The value of pKb for the base ethylamine (CH3CH2NH2) is 3.19 at 25°C, while the pKa for formic acid (HCO2H) is 3.74, also at 25°C. a) Calculate the value of the equilibrium constant Kc for the following aqueous equilibrium: HCO2– (aq) + CH3CH2NH3+(aq)-->HCO2H(aq) + ...
61. ### chemistry

At a certain temperature, the equilibrium constant, K, for this reaction is 53.3. H2(g)+I2(g)->2HI(g) At this temperature, the reactants were placed in a container to react. If the partial pressures of H2 and I2 were each 0.300 bar initially, what is the partial pressure of...
62. ### Chemistry

Consider the following hypothetical acid-base reaction. A(aq) + B(aq) C(aq) + D(aq) WA WB SA SB Question 13 options: The position of the equilibrium shifts from left to right The position of the equilibrium shifts from right to left The position of the equilibrium doesn’t ...
63. ### Physics

A spring with a spring constant k=450.0 N/m is attached to a mass of m=8 kg and stretched -0.5 m from its equilibrium position and released. What is the speed of the block when it is at the equilibrium position?
64. ### English

1.Mom always (____) her glasses down somewhere and then can't find them. 2.No one could believe that Carol had been (___) near the dog the entire time. Use correct form of sit or set 1.sets 2.sitting 1.My grades have (----) a little each semester. 2.My father jokes that he (...
65. ### art history

1. During the ______, the writings and art of Ancient Greeks were rediscovered. 2. ______ is the study of religious faith, practice and experience. 3. Renaissance thinkers promoted _______, individualism, and secularism. 4. _______ is the idea that people should be more ...
66. ### Physics

A meter stick has mass 39 g, and has a pivot placed at the center at the 50 cm mark. A mass of m1 is place at the 5 cm mark. Another mass of 10 g is placed at the 70 cm mark. What mass m in grams has to be placed at the 80 cm mark to create translational and rotational ...
67. ### Science ASAP

2. Ferns have roots, stems, and leaves just like seed plants. Why are they classified separately? (1 point) Their leaves are compound and feathery. They produce cones to reproduce. Their roots are only shallow rhizomes. They produce spores instead of seeds. 3. The first plants...
68. ### chemistry check my work

the equilibrium-constant expression for a reaction is kc= [N2][H2O]2 ---------- [NO]2[H2] what is the equilibrium-constant expression when the equation for this reaction is halved and then reversed? 2NO + 2H2 --> N2 + 2H2O NO + H2 ---> N + H2O N + H2O --> NO + H [NO][...
69. ### Chemistry

At T = 25 degrees Celsius, the reaction No2 <-> 2NO +O2 has an equilibrium constant K=5.0*10^-13. Suppose the container is filled with NO2 at an initial pressure of 0.25 atm. Calculate the partial pressure of NO at equilibrium
70. ### Chemistry

The equilibrium constant Kp for the following reaction is 4 atm^2 at 300 K. AB(s) = A(g) + B(g) What is the equilibrium pressure of A(g) and B(g) above AB(s) at 300K? What is Kc at 300K? How would i solve this when they don't even give me any partial pressures?! All of the ...
71. ### Chemistry

A 10.0-g sample of solid NH4Cl is heated in a 5.00-L container to 900.°C. At equilibrium the pressure of NH3(g) is 1.51 atm. NH4Cl(s) mc011-1.jpg NH3(g) + HCl(g) The equilibrium constant, Kp, for the reaction is:
72. ### Chemistry

At T = 25 degrees Celsius, the reaction No2 <-> 2NO +O2 has an equilibrium constant K=5.0*10^-13. Suppose the container is filled with NO2 at an initial pressure of 0.25 atm. Calculate the partial pressure of NO at equilibrium
73. ### English

Word box abstain accommodate allegiance amalgamate append commemorate enumerate exalt extort far-fetched glum replica responsive sanctuary self-seeking submissive tally taskmaster transform upheaval 2.Good employees don't need a(n)) ____ to keep them working taskmaster 8.I ...
74. ### 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) + H2O(...
75. ### pH calculations

A backyard pool as a pH of 7.4. At this level, the concentrations of hypochlorus acid and hypochlorite are approximetly equal. HClO(aq) <--> H^+ (aq) + ClO^- (aq) (a) Predict the effect of increasing pH has on the concentration of HClO(aq) in the pool. For this question...
76. ### College Chemistry

Given the following equilibrium constants, Ka (NH4^+)=5.6*10^-10 Kb (NO2^-)=2.2*10^-11 Kw=1.00*10^-14 determine the equilibrium constant for the reaction below at 25*C. NH4^+(aq)+NO2^-(aq)f HNO2(aq)+NH3(aq)
77. ### chemistry

The equilibrium constant for the following reaction is 5.0 at 100c. If an equilibrium mixture contains [No2]=0.50 M, what is the [N2O4]? 2No2(g) <--> N2O4 (g) I do not understand if the Kc is 100c or where that plays in!
78. ### Chemistry

The equilibrium constant for Br2 + Br <-> Br3 at 25 degrees is 18. Calculate the equilibrium constant Br3 <-> Br2 + Br
79. ### Chemistry

The reaction N2O4(g) -->2NO2(g) has Kc = 0.133 at 25 °C. What is the NO2 concentration in a 5.00 liter flask if it contains 0.250 mol of N2O4 at equilibrium I know I set something equal to Kc?
80. ### Biochemistry

A reaction A<-->B starts with equal concentration of A and B. AT equilibrium, there is twice as much B as A. What was the value of change in Gibbs Free energy when the reaction originally started if the temperature was 300k?
81. ### Biochemistry

A reaction A<-->B starts with equal concentration of A and B. AT equilibrium, there is twice as much B as A. What was the value of change in Gibbs Free energy when the reaction originally started if the temperature was 300k?
82. ### chemistry

Indicate the approximate of pH of a buffer made from equal concentrations of each of these pairs C6H5C00H/C6H5C00 H3B03/H2B03
83. ### Chemisrty

Assuming equal concentrations, rank these solutions by pH: hclo4 caoh2 NH3 koh hbro
84. ### CHEM

Which of the following will be affected by the addition of a catalyst to a chemical reaction? Choose all that apply. thanks A)the magnitude of the equilibrium constant B) the value of the ratio kf/kr C) ÄHo D) ÄSo E) the value of the forward rate F) the value of the reverse ...
85. ### chem help!

If the equilibrium constant is much less than 1, how can you tell where the equilibrium lies? A. Reactants are in the numerator of the equilibrium expression, so equilibrium lies toward the reactants. B. Products are in the numerator of the equilibrium expression, so ...
86. ### chemistry

If the equilibrium constant is much less than 1, how can you tell where the equilibrium lies? A. Reactants are in the numerator of the equilibrium expression, so equilibrium lies toward the reactants. B. Products are in the numerator of the equilibrium expression, so ...
87. ### Chemistry

My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the concentration of I^-1 when I...
88. ### Chemistry

My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the concentration of I^-1 when I...
89. ### Chemistry

My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the concentration of I^-1 when I...
90. ### Chemistry

The reaction has an equilibrium constant of Kp=2.26x10^4 at 298 K. CO(g) + 2H_2(g) <-> CH_3OH(g) Calculate Kp for the reactions and predict whether reactants or products will be favored at equilibrium. A. CH_3OH(g) <-> CO(g) + 2H_2(g) B. 1/2CO(g) + H_2(g) <->...
91. ### physics

A 4.10 kg object on a horizontal frictionless surface is attached to a spring with spring constant 840 N/m. The object is displaced from equilibrium 50.0 cm horizontally (in the + direction) and given an initial velocity of 9.9 m/s back toward the equilibrium point at t=0 s
92. ### Physics

A mass of 0.77 kg, hanging from a spring with a spring constant of 37 N/m, is set into an up-and-down simple harmonic motion. What is the speed of the mass when moving through the equilibrium point? The starting displacement from equilibrium is 0.2 m. [Answer in meters/second]
93. ### Math

What do the digits in the number 15 add up to? Answer 1+5=___. Using single digits, how many different ways can you add up to 6?. Example: The least number of digits is 2, and it is 1+5=6. The greatest number of digits is 6, and it is 1+1+1+1+1+1=6. 1.How many other numbers ...
94. ### Chemistry

0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 5.0 * 10^-4 M. What is the equilibrium constant, Ka, for this acid? a. 5.0 *10^-2 b. 5.0 * 10^-3 c. 2.5 * 10^-4 d. 2.5 * 10^-5 e. 2.5 * 10^-6 2. (Points: 1) What is the carbonate-ion, CO3^-2, ...
95. ### Environmental science

i'm a little unsure about my answers for these questions. Can someone please check them for me?, thanks.: 15. All of the following are major interactions between species EXCEPT a. competition and mutualism b. predation and parasitism c. commensalism and competition d. adaption...
96. ### Physics

An engine pulls a train of 20 frieght cars each having a mass of 5.0*10^4 kg with a constant force. The cars move from rest to a speed of 4.5 m/s in 19.7s on a straight track. Neglecting friction, the force with which the tenth car pulls the eleventh one (at the middle ofthe ...
97. ### Chemistry

Nitrogen dioxide decomposes on heating according to the following equation 2NO2 (g) ↔ 2NO (g) + O2 (g) When 4 mole of nitrogen dioxide were put into a 1dm3 container and heated to a constant temperature, the equilibrium mixture contained 0.8 mole of oxygen. What is the ...
98. ### Chemistry

Which of the following will be affected by the addition of a catalyst to a chemical reaction? a. ÄGo b. the value of the reverse rate constant, kr c. the value of the reverse rate d. the value of the ratio kf/kr e. the value of the forward rate f. the value of the forward ...
99. ### physics

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a distance of x0 = 1.7 m from...
100. ### physics

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a distance of x0 = 1.7 m from...