1. Chemistry

    A gas initially at 20 C must be changed to ____ C to triple the pressure.
  2. Science

    The actual alleles of an organism is its ____. - Is the answer = genotype? Thanks
  3. algebra

    Which numbers cannot be used in place of the variable in each rational expression? 2y+1 ____ y^2-y-6
  4. social studies

    ____ make up the majority of the population in guatemala
  5. Physics

    Radio waves carry a ____ from a station to your home
  6. trig

    Complete the general solution to y = arcsin -. y=____±2k IM lost please help
  7. physics-14

    If room temperature is 70 degrees farenheit,what is kelvin?____
  8. Calculus

    Let f(t)=(1)/(t) Find a value of t such that the average rate of change of f(t) from 1 to t equals 14. t= ____
  9. Math (check answer)

    2.B 2.The sum of two integers is ____ positive. A.always B.sometimes C.never
  10. Grammar

    The pen is often compared ____ a sword... Will it be "to" or "with" Pls tell me when to use to and when to use with ? What will be the above answer ?
  11. Math

    When 3√y^7/√y3 is simplified and written in the form of y^a/b, the values of a and b respectively are? ___ and ____
  12. algebra

    slope=2/5,{10, 3} is on the line find the y-intercept: y= mx + b ___ = {---} ____ +b
  13. math

    ____ inches or 12 yards is the width of a tennis court
  14. Spanish

    what is the correct pronoun: El hombre ____ (el libro) da al joven.
  15. french

    i need help with fill in the blanks. je ne fais pas ____ athletisme a. du b. de l' c. de d. d'
  16. science

    what is it called when a scienist makes a mistake, or ____, and need to do an experiment again
  17. MATH

    Find the LCD them make in into similar: -3y 4y^2 ____ , _____ x-1 x^2-1
  18. Elem Algebra

    solve the formula for specified variable V=BQT for B B = ____
  19. math

    What i want to say is that if you have to find, for example 66 and 2/3 of ____ which equals 74, how do you do it? 66 and 2/3 of ______ = 74? I assume you mean 66 2/3%, which is 2/3. If 2/3 of x = 74, then x = 74/(2/3) = (3/2)*74 = 111 You're right . i did mean 66 2/3% Thanks!!!
  20. Adding two-digit numbers

    Estimate. Then find each sum. 28 +34 ____
  21. Chemistry

    Check answers? 1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements? A) Cathode rays are negatively charged particles**** B) Cathode rays can be deflected by magnets C) An electron is 2000 times lighter than a hydrogen atom D) Charge-to-...
  22. Chemistry

    Consider the reaction: 2CO(g) + O2(g) equilibrium 2CO2 (g) Write the equilibrium expression for this reaction. Keq = ?? Addition of a catalyst to this reaction would have what effect on the equilbrium? Addition of a catalyst to this reaction would have what effect on the rate?
  23. P-Chem

    Protein denaturations are usually irreversible but may be reversible under a narrow range of conditions. At pH 2.0, at temperatures ranging from about 40 degrees celcius to 50 degrees celcius, there is an equilibrium between the active form P and the deactivated form D of the ...
  24. Chemistry

    The solubility of CaCO3 at 25 degrees celsius is 6.90*10-5M. The reaction is CaCO3(s)-->Ca 2+(aq) + CO3 2-(aq) <-- a. Calculate the concentration of Ca +2 and CO3 -2 at equilibrium. b. Calculate the equilibrium constant for the dissolution reaction. (also known as the ...
  25. Chemistry

    The following questions refer to the following system: 500 mL of 0.02 M Mn(NO3)2 are mixed with 1.0 L of 1.0 M Na2C2O4. The oxalate ion, C2O4, acts as a ligand to form a complex ion with the Mn+2 ion with a coordination number of two. Mn2+ + C2O42- goes to MnC2O4 K1 = 7.9 x 10...
  26. MS. SUE HELP- Chemistry

    Check answers? 1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements? A) Cathode rays are negatively charged particles**** B) Cathode rays can be deflected by magnets C) An electron is 2000 times lighter than a hydrogen atom D) Charge-to-...
  27. Chemistry

    Given: Al^3+ forms a complex ALSO4+ in the presence of sulfate... Al^3+ + SO4^2- = AlSO4+ with Kstab = 10^3.01 Question: How many ppm Al(total) would be in equilibrium with gibbsite at pH 4 and 25 degrees celsius in the presence of 10^3- m SO4^2- (consider only this one ...
  28. Physical Science

    Hello! Thanks for checking my question out! ____ Fill in the Blank 10. The _______________ theory of matter states that all particles of matter are in constant motion. (1 point) My Answer: kinetic Could someone please check my answer? Thanks! - Da Fash
  29. Chemistry

    A mixture containing the same number of moles of SO2 and O2 is placed in a 2L container at 900K. The initial pressure is 1.90Atm. A reaction occurs leading to the formation of SO3: 2SO3 + O2 <--> 2SO3 After equilibrium is established the TOTAL pressure drops to 1.60 Atm...
  30. Chemistry

    ‘At 600.0 K, the equilibrium constant based on pressure is Kp = 1.83 x 10^2. Gaseous C2H4 and H2O are placed in a 1.2 L closed flask at 600.0 K. At equilibrium, the flask contains 0.0062 mol of C2H4 and 0.041 mol of H2O. Determine the equilibrium constant Kc assuming the ...
  31. chemistry

    What happens to the following reaction at equilibrium if the pressure is decreased? 2H2(g) + O2(g) 2H2O(g) A. The equilibrium shifts left because Q < K. B. The equilibrium shifts right because Q < K. C. The equilibrium shifts right because Q > K. D. The equilibrium ...
  32. chem

    An equilibrium mixture of the following reaction was found to have [COF2] = 0.255 M and [CF4] = 0.118 M at 1000°C. What is the concentration of CO2? 2 COF2(g) CO2(g) + CF4(g) Keq = 2.00 at 1000°C Thanks:)
  33. Math (Questions)

    Drinking 8 fluid ounces of milk provides 270.0 milligrams of calcium. How many fluid ounces of milk provide 72.5 milligrams of calcium? Round to the nearest tenth. 2.6 fluid ounces 2.3 fluid ounces ** 1.8 fluid ounces 2.1 fluid ounces --------------------------------- A scale ...
  34. Chemistry

    Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) -----> PCl3 (g)+ Cl2(g) Kc= 1.80 at 250 degrees C A 0.206 mol sample of PCl5(g) is injected into an empty 3.30 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(...
  35. Chemistry check my answer?

    Hi! is my answer correct? Consider the following chemical reaction: H2 (g) + I2 (g) <> 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, 0.033 M, and 0.55 M, respectively. The value ofKeq for this reaction is I solved by...
  36. chemistry

    would the pKa = pH in this case? because the ml and concentrations are equal in each scenario? If you plug it in the formula, I think your logs would equal 0 because it would be log(1) = 0. My asnwer is not coming out right though.
  37. Social Studies

    1. The empress Theodora helped (1 point) the theater prosper. destroy the Byzantine Empire. women gain more rights.* Rome become prosperous again. 2. From the AD 500s to the AD 1100s, the Byzantine Empire (1 point) was a crossroads for trade. * was constantly at war with Rome...
  38. AP Chemistry

    The equilibrium constant for thermal dissociation of F2 F2(g)<->2F(g) is 0.300. If initially 1.00 mol F2 is placed in a 1.00 L container, which of the following is the correct number of moles of F2 that have dissociated at equilibrium? 1. 0.130 mol 2. 0.418 mol 3. 0.548 ...
  39. chemistry: equilibrium

    predict shift in equilibrium position and effect on amount of chlorine gas when volume is doubled at constant temperature. PCl3 (g) + Cl2(g) -> PCl5 (g)
  40. economics

    since the AC curve in the problem is upward-sloping everywhere, it is not possible to construct a zero-profit equilibrium given the assumptions of the problem (this outcome requires a U-shaped AC curve). this problem will consider an alternative example where a long-run ...
  41. HARD CHEM QUESTION- any help appreciated

    Phosgene (COCl2) is a poisonous gas that dissociates at high temperature into two other poisonous gases, carbon monoxide and chlorine with equilibrium constant Kp = 0.0041 at 600 K. Find the equilibrium composition of the system after 0.124 atm of COCl2 is allowed to reach ...
  42. Chem2

    A reaction in which A, B, and C react to form products is zero order in A, one-half order in B, and second order in C. If the concentration of C is increased by a factor of 4.95 (and all other concentrations are held constant), how much will the rate of reaction increase?
  43. Rate Laws

    If the initial concentration of AB is 0.210 M, and the reaction mixture initially contains no products, what are the concentrations of A and B after 75 s? The reaction is in the second order: rate=k[AB]^2 The rate constant is k=5.4*10^2 M*s I don't understand how to find A and...
  44. I really need help with biology!!

    I need help understanding my bio assignment. Can you tell me weather or not I got them right and if I didn't get them right can you correct them and tell me the right answer to give me a better understanding? I put a star (*) next to my answer. 1. Which type of muscle makes up...
  45. Biology

    In order to predict the percentage of males and females three assumptions must be considered: 1. The X carrying sperm and Y carrying sperm have an equal chance of fetilization: 2. The egg and sperm combine at random: 3. the XX and XY zygotes have equal chance of development at...
  46. chemistry

    The concentrations of Ca and Na in a sample of river water are 13.4 mg/kg and 5.2 mg/kg. Express the concentration in molality
  47. calculus

    In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in 1980, 1990, and 2000...
  48. Chemistry

    Hi this question is on my study guide and I want to make sure I get to the right answer and know why. Calculate K for the synthesis of ammonia at 400°C N2(g) + 3 H2(g) —> 2 NH3(g) <— , if the following concentrations are present at equilibrium: N2(g)= 1.2 mol/L, H2(...
  49. Chem

    You made up a saturated solution of calcium sulfate (CaSO4). The temp is 25 degrees Celsius. You then add 5.00*10^-3 of sodium sulfate (NaSO4). What are the concentrations of calcium and sulfate after equilibrium is reached? The pKs of CaSO4 is 4.58. I know the Ks of CaSO4 to ...
  50. English

    Word box abduct ambiguous balk compact confer earmark frigid implement incalculable indisputable intensive maneuver sabotage scant stealthy strapping strident thrive titanic valiant 3.The millionaire has hired special guards to make sure that his children will not be ___ ...
  51. Algebra

    Rational Expressions. 1.) 2x^2-8x 8x^2 _______ / ____ x^2-16 (x+4)^2 Solution: x+4 ___ x Is this correct?
  52. chemistry

    the lewis structure for each of the following species except ____ contains a triple bond? N3- O2 2+ N2 NO+ HCCH
  53. Algebra

    points (0,500) and (1,680) The EXPONENTIAL function is y(t)=___?____
  54. American Government

    The Continental Congress exercised both ____ and _____ powers.
  55. Chemistry

    How much oxygen (in grams) will form from 44.2 mg of N2O5? 2N2O5(s) → 4NO2(g) + O2(g) ____× 10^-3(g) O2
  56. health

    After ejaculation, the sperm can live for about ____ in the female reproductive tract
  57. chemistry

    How many mL of 0.750 M HCl are needed to neutralize 14.89 mL of 0.350 M NaOH? ____ mL
  58. Math

    3. x(5,-8) Go down 5, left 7, and down 6 more quadrant:_________;point:x(___,____) Plz help
  59. Alg I

    12r^2 + ____ + 6 How do I solve this ax^2 + bx + c problem. Please explain in detail. I simply do not get it. Thanks.
  60. geometry/math

    a ____ is a polyhedron that has two conguent faces called _____.
  61. Math 222

    Using the Rules of Exponents. Please show me how to simplify each expression. 27 -2/3 ____ 27 -1/3
  62. Sociology

    Today, about ____ percent of American workers are female. A.) 25 B.) 40 **** C.) 50 D.) 75 I believe that answer is B, am I right?
  63. Science

    a(n) ____ occurs during the design process when one benefit is given is given up in order to obtain another thanks
  64. Vocabulary

    The ____ definition of glommy is dismal or depressing A. connotative B. denotative A
  65. math

    list the necessary steps needed to find the missing answer 2*(3+5)=____-7
  66. algebra

    Hello, can you help me find the slope for x=2-y ____ 9 its 2-y over 9 I thought the answer was 2 but my professor said that's wrong. thanks
  67. English

    Dave hoped that Steve and ____ would win the tennis tournament Him Himself He His
  68. Math

    For each of the following, fill in the blank to create a perfect-square trinomial: (a) x2 −6x+ ____ y2 +7y+ __
  69. MAth

    1.Simplify 3x 3 ___ divided by ____ 4 4 2.Describe the Fibonacci Sequence.
  70. math

    a(n) ____ occurs during the design process when one benefit is given is given up in order to obtain another thanks
  71. chemistry

    Consider the following reaction Al(OH)3 + 3HCL ____>ALCL3 How many milliltres of 0.8 M HCL will react with 2g of AL(OH)3 ??
  72. Algebra

    Correct the right hand side of the following expressions. (a) 5 x 5+x _ + _ = ____ 2 6 2+6 (b) 6x + 5 _______= x+5 6 (c) 1 1 1 _ +_ = ___ y c y+c
  73. Calculus

    The slope of the line normal to the curve e^x − x^3 + y^2 =10 at the point (0, 3) is ____
  74. 6th Grade Science

    In the ____ temperatures can increase up to 1,700˚C.
  75. IPC

    The type of bond formed by shared electrons is ____. covaletn, right?
  76. SS

    If the California Current stopped flowing, the temperature in San Francisco would probably be ____.
  77. Spanish 1

    Venden Uds. frutas? No, aqui nosotros ____ ropa.
  78. Comm/215

    I was surprised by how successful Janice ____. had became or became? They both sound correct.
  79. health

    people living with HIV can have a longer and healthier life by ____
  80. Chemistry

    Al^3+ forms a complex ALSO4+ in the presence of sulfate... Al^3+ + SO4^2- = AlSO4+ with Kstab = 10^3.01 How many ppm Al(total) would be in equilibrium with gibbsite at pH 4 and 25 degrees celsius in the presence of 10^3- m SO4^2- (consider only this one complex and assume ...
  81. Chemistry

    Al^3+ forms a complex ALSO4+ in the presence of sulfate... Al^3+ + SO4^2- = AlSO4+ with Kstab = 10^3.01 How many ppm Al(total) would be in equilibrium with gibbsite at pH 4 and 25 degrees celsius in the presence of 10^3- m SO4^2- (consider only this one complex and assume ...
  82. AP Chem

    CH3CH2NH2(aq) + H2O(l) <-> CH3CH2NH3+(aq) + OH-(aq) Kb = 5.0e-4 Ethylamine, CH3CH2NH, a weak base reacts with water according to the equation above. A 50.0 mL sample of a ethylamine solution is found to have a pH of the solution 11.60. (a) Write the expression for the ...
  83. MicroEconomics (please help)

    Can someone please help me with the following questions? thanks a lot 1. The cranberry market is perfectly competitive. Reports that consuming cranberries can lead to improved health result in a permanent increase in the demand for cranberries and an immediate upward jump in ...
  84. Chem/math question - from Sam

    For the following reaction at 600. K, the equilibrium constant, Kp, is 11.5. PCl5(g) = PCl3(g) + Cl2(g) Suppose that 2.510 g of PCl5 is placed in an evacuated 470. mL bulb, which is then heated to 600. K. (a) What would be the pressure of PCl5 if it did not dissociate? ___atm...
  85. math calculus (please help me)

    In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in 1980, 1990, and 2000...
  86. Chemistry

    Help me set up this problem. I have been looking at a few examples of similar problems and I keep getting the wrong answers. I'm getting really confused. Q: The standard free energy change ΔG∘ and the equilibrium constant K for a reaction can be related by the ...
  87. Chemistry

    Another Equilibrium Question! The following reaction is at equilibrium in a closed 20.0-L container. At equilibrium, the pressures of NH3 and HCl are both equal to 0.00552 atm, and the mass of NH4Cl (s) is 35.4 g. Calculate the equilibrium pressure of NH3 after 11.3 g of NH4Cl...
  88. Chemistry 3A

    An aqueous solution contains the ions B, C, and D that are in equilibrium with one another according to the reaction B (aq) + C (aq) ->/<- D (aq) A certain amount of water is added so as to double the volume of this solution, while keeping the temperature and the ...
  89. Math

    Cosmic ray bombardment of the atmosphere produces neutrons, which in turn react with nitrogen to produce radioactive carbon-14. Radioactive carbon-14 enters all living tissue through carbon dioxide (via plants). As long as a plant or animal is alive, carbon-14 is maintained in...
  90. AP chem

    The experiment can be extended to determine the order of reaction m with respect to [OH-] by varying the concentration of hydroxide ions [OH-] Assume that the value of the pseudo-rate constant k’ was measured for two different concentrations of [OH-]. The value of k’ was ...
  91. Chemistry

    I think I made a mistake with my previous question. I have two solutions potassium thiocyanate (KSCN) and iron (III) chloride (FeCl3). The reaction is Fe+++(aq) + SCN-(aq) <--> FeSCN++(aq) What will happen if the solution is heated? Will the reaction rate shift to the ...
  92. math

    9^x - 4 X 3^x = 45. Find x In words: 9 raised to the power x minus 4 multiplied by 3 raised to the power x is equal to 45. Find x.
  93. college chemistry

    When a sample of HI(g) (5.825 mol) is placed in 320.0 L reaction vessel at 702.0 K and allowed to come to equilibrium the mixture contains 1.052 mol of H2(g). What is the equilibrium concentration (mol/L) of HI(g)? 2HI(g) = H2(g)+I2(g)
  94. Spanish 1

    16. Soy ordenado, pero ____ soy desordenado. a. tampoco b. jueves c. a veces d. de veras C? 17. a mí no me gusta _____. a. pero a ti b. tampoco c. a veces a mí d. tambíen Not sure... 18. -¿_____ impaciente? -No, soy paciente. a. Eres b. Te llamas c. Cómo te llamas d. Có...
  95. spanish

    Llena el blanco con la palabra correcta del banco de palabras: le, perdió, fijo, ingresos, les o perdió Un gasto ____ es un gasto que no cambia; ni sube ni baja de un mes para otro. For this one I think its "ingresos" Llena el blanco con la palabra correcta del banco ...
  96. 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 initial H2X solution...
  97. 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 initial H2X solution...
  98. CHM 152

    Consider the following equilibrium: PCl3 + Cl2 = PCl5 Kc=26 @ 250 degree Celcius 1.0 mol of PCl3 , 1.0 mol of Cl2 , and 5.0 mol of PCl5 are placed in a 10.0L flask at 250 C and allowed to come to equilibrium. What is the concentration, in M, of at equilibrium? Choose one ...
  99. chemistry

    An unknown substance has a mass of 17.3 . When the substance absorbs 1.557×102 of heat, the temperature of the substance is raised from 25.0 to 45.0 . What is the most likely identity of the substance?
  100. Math

    Eli has 36 books. He places the same number of books on each of 9 shelves. Which equation below could be used to find the number of books on each shelf? A 36/ ___=6 B ___ x9=36 C 36/6 = ___ D 6x9=____ Plz help..thanks
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