1. chem

    Please explain: 1) if MnO2 when in a fast reaction with H2O2 appear in balanced equation and 2)purpose of manganese dioxide. Thanks
  2. Chem

    What is the balanced net ionic equation for magnesium metal being placed in a solution of gold(3) chloride ?(with steps please)
  3. Chem

    What is the balanced net ionic equation for aluminum foil reacting with hydrochloric acid ? (with steps please)
  4. Chemistry

    Use the following balanced equation. 3Sr(OH)2 + 2H3PO4 --> 6H20 + Sr3(PO4)2 How many mL of 0.10 M Sr(OH)2 are required to react with 30 mL of 0.30 M H3PO4?
  5. Chemistry

    How do I write ZnSo4(aq)+Na3Po4(aq)---> Zn3(Po4)2(s)+Na2S04(aq)as a net ionic equation balanced?
  6. organic chemistry

    write a balanced equation for the reaction of benzoic acid with 3 M sodium hydroxide solution
  7. chemistry

    Write the balanced equation for the combustion of C2H5(NH2)CO2H . The nitrogen is converted to N2O4
  8. Chem

    Predict the mass of CuO expected to result from the decomposition of the malachite, based on the balanced equation.
  9. chemistry

    Ethane burns in limited supply of air to give carbon monoxide. What would be the balanced equation for it?
  10. chemistry

    what is the coefficient on oxygen in the balanced equation for the following hydrocarbon combustion reacton C7H14 + O2 + CO2 + H2o
  11. Chemistry

    Is this equation for acetic acid + sodium chloride balanced? C2H4O2 + NaCl ---> HCl + C2H3NaO2
  12. chemistry

    How do you write a balanced equation for the preparation of phenylmagnesium bromide and it's reaction with benzophenone followed by neutralization in acid?
  13. Chemistry

    Predict the product(s) and write a balanced equation for the following redox reaction: pentane (C5H12) + oxygen ---->
  14. Chemistry

    Write the balanced equation for the double replacement reaction of: Barium chloride and Sulfuric acid
  15. Chemistry

    What is the coefficient in front of carbon dioxide when the following equation is balanced? C3H8(l) + O2(g) → H2O(g) + CO2(g) a. 1 b. 3 c. 5 d. 6
  16. chemistry

    what is the sum coefficient and balanced equation of : Co(OH)3+Na2CO3 my answer is 3Co(OH)3+ 3Na2CO3---> 3CoCO3+ 3Na2OH
  17. Algebra

    Can someone show me step by step how to do this problem to have an example to go by so I will be able to do my other problems. Thanks Solve by substitution 4x-12y=5 -x+3y=-1 I know that you have solve one of the equations. I have picked the second one so
  18. Chemistry

    Assign oxidation numbers for the following chemical equation: 2Al + 3H2SO4 ---> Al2(SO4)3 +3 H2 What was oxidized? What was reduced? My answer: Oxidation numbers going from the left side of the chemical eq to the right side.. Al: 0 H: +1 S: +6 O : -2
  19. ration equation mind jumbler

    What is an example of a rational equation where the solution makes the denominator equal to zero and are extraneous solutions?
  20. trig

    Solve the triginometric equation analytically. Use values of x for 0 less then or equal to x less then 2pi The equation for this question is sin2x + cos2x = 0
  21. Environmental Science

    A nuclear burning power plant produces a total power of 1.1kW. It serves a community that requires 2.85 x 107 kJ of power over the entire year. How many days per year does the power plant need to operate to provide all this power? 300 days 250 days 365
  22. CHEMISTRYY!

    Determine if HNO3 can dissolve in the following metal: 1) Write a balanced chemical reaction showing how the 2.09g Cu dissolves in HNO3. I had put down: Cu(s) + 4HNO3(aq) ——> Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) but it's wrong. 2) Determine the minimum
  23. chemistry

    I have found a balanced redox equation for removal of silver sulfide using sodium hydrogen carbonate in aluminium to say: 2Al + 3Ag2S + 6H2O --> 6Ag + 2Al2(OH)3 + 3H2S What happens to the Na and C component of the sodium hydrogen carbonate? And why is
  24. physics

    what is the mass of a vehicle traveling at 25 km/hr with a kinetic energy equal to 1 x 10 to the 4th power J?
  25. Organic Chemistry 1

    Consider the HF solution with the concentration of 5%(w/v). You can convert the % concentration into the molarity. a) Assume that you have 100ml of this solution. Determine the number of moles of HF if the concentration of HF is given as 5%(w/v) For this
  26. algebra homework help

    Let z be the unknown number. −61 times the difference between a number and 56 is equal to the number plus −28 Is this correct: -61(z-56)=z-28
  27. Spanish

    Hola! Could you please check my work and correct me if I am wrong? 1. Antes de subir la escalera, la niña ___________ de los huéspedes. a. se despidieron b. se había despedido c. se despida d. ***se despidiera 2. Si me lo ______ antes, te habría dicho
  28. Science

    Please help me with these questions from the Science 6: Forces and Motions Unit Test. My answer-****** 1. Which of the following best describes the movement of an object at rest if no outside forces act on it? (1 point) It will move due to inertia. Gravity
  29. chemistry

    HELP PLEASE... what is the chemical equation for these situations..? a) there is a straight iron nail in the solidified gelatin solution. the gelatin solution was prepared with phenolphthalein and K3Fe(CN)6. b) same scenario as with (a) but the nail is
  30. chemistry

    HELP PLEASE... what is the chemical equation for these situations..? a) there is a straight iron nail in the solidified gelatin solution. the gelatin solution was prepared with phenolphthalein and K3Fe(CN)6. b) same scenario as with (a) but the nail is
  31. chemistry

    HELP PLEASE... what is the chemical equation for these situations..? a) there is a straight iron nail in the solidified gelatin solution. the gelatin solution was prepared with phenolphthalein and K3Fe(CN)6. b) same scenario as with (a) but the nail is
  32. chemistry

    what is the chemical equation for these situations..? a) there is a straight iron nail in the solidified gelatin solution. the gelatin solution was prepared with phenolphthalein and K3Fe(CN)6. b) same scenario as with (a) but the nail is bent c) same with
  33. Advanced Math

    A circle of center (-3 , -2) passes through the points (0 , -6) and (a , 0). Find a. The triangle bounded by the lines y = 0, y = 2x and y = -0.5x + k, with k positive, is equal to 80 square units. Find k. When the polynomial P(x) = x3 + 3x2 -2Ax + 3,
  34. Chemistry

    I don't know if i am solving for the number moles of NaI correctly, i multiply .21 by 1.67, is that incorrect? i know that to solve this you have to find the limiting reagent, but i think the problem might be that i am solving for moles wrong. If 210 mL of
  35. Chemistry

    What is the Henderson-Hasselbach equation? Use the equation to determine the ratio of [A-] to [HA] necessary to create an ammonium chloride/ammonia buffer with a pH of 8.50. Describe how to make this buffer given a solution of 0.1 M NH3 (aq) and a bottle
  36. Pre-Algebra 8th grade

    I need help with my homework that is due tomorrow. Question 1 (Multiple Choice Worth 1 points) (01.01 MC) Which decimal number best describes the fraction fraction 137 over 6? *** A repeating decimal 22.83 with a bar over 3 A terminating decimal 22.83 A
  37. Algebra

    I'm not sure if anyone saw my question yesterday, but here it is again. Even if you can only answer 1 or 2 of the questions, that is fine. I am so confused with the rules of exponents. I know them, but I have a hard time applying them because of all the
  38. science

    if an acid has a pH of 1.1 what is the hydrogen ion concentration of the solution expressed in scientific notation to 3 significant figures, for my answer can it be written 1 x 10^-1.1 mol dm3? or can you not use decimals in the to the power of so should i
  39. Math for Steve

    1. Write the ratio in the simplest form. 45 : 15 a. 9 : 3 b. 3 : 1 c. 1 : 3 d. 4 : 1 4. Jake sold 39 tickets to the school fair, and Jeanne sold 12 tickets. What is the ratio, in simplest form, of the number of tickets Jeanne sold to the number of tickets
  40. As Physics

    Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge Two copper wires of diameter 1 mm and 2
  41. science

    A charge of +9.0 nC and a charge of +4.0 nC are separated by 50.0 cm. Find the equilibrium position for a −1.0 nC charge as a distance from the first charge. The Coulomb charge is 8.98755 × 109 N · m2 /C 2 . Answer in units of cm.
  42. Physics

    Five Forces act on an object: 1. 60 N at 90 degrees 2. 40 N at 0 degrees 3. 80 N at 270 degrees 4. 40 N at 180 degrees 5. 50 N at 60 degrees What are the magnitude and direction of a sixth force that would produce equilibrium?
  43. physics

    Five forces act on an object: 1: 60 N at 90 degrees, 2: 40 N at 0 degrees, 3: 80 N at 270 degrees, 4: 40 N at 180 degrees, and 5: 50 N at 60 degrees. What is the magnitude and direction of the 6th froce that would produce equilibrium?
  44. AP Chemistry

    This questions has 5 parts but I already have the answers for a and b. I need help on the last three parts. In an electrolytic cell, a current of 0.250 ampere is passed through a solution of a chloride of iron producing Fe(s) and Cl2(g). a) write the
  45. i lied. very quick calc problem.

    f(x) = abs(sin(x)), -pi less than or equal to x less than or equal to pi g(x) = x^2 let H(x) = g(f(x)) i got that H(x) would equal sin^2(x). THIS IS WHERE I AM STUCK! find the domain of H. do i still need to account for "-pi less than or equal to x less
  46. Physics

    Draw a block and tackle system of pulleys with a velocity ratio of 5.A block and tackle with a velocity ratio of 5 is used to raise a mass of 25kg through a vertical distanceof 40cm at a steady rate. If the efforts is equal to 60N, determine a)d distance
  47. chem

    Can anybody explain to me how to determine the endormicity and exormicity in a reaction and where does the equilibrium shift. Pls. give an example of it. Iwas reading my book and trying to understand but i really can't comprehend it. Now I'm stuck here i
  48. science

    when 1 gram of water evaporated the volume of the water vapor increases but the mass remains constant. why does the water remain constant i think because the number of atoms remain constant
  49. Algebra1

    Books: Over the summer, you read 20 books. Eight of these books were biographies. a. Find the ratio of biographies to the total number of books. b. Find the ratio of non-biographies to biographies. c. Find the ratio of non-biographies to the total number
  50. Calculus

    "I would like to integrate the following equation. It is a chemical rate equation (Arrhenius) where I have temperature & relative humidity as functions of time. Both are sinusoidal, reflecting a typical yearly climate": e^-(Integral(k*RH(t))dt), where
  51. College chemistry math ratio problem

    Earlier you determined that the proper ratio of packages of buns, packages of patties, and jars of pickles is 3:2:4. If you want to feed at least 540 people, but also maintain the proper ratio, what minimum number of packages of buns, packages of patties,
  52. Math - Solving Trig Equations

    Solve each equation for 0 is less than and equal to "x" is less than and equal to 360 3sinx = 2cos^{2}x ----- I don't know how to solve this equation...this is what I have, but I don't know if I'm on the right track or not 3sinx = 1 - 2sin^{2}x 3sinx - 1 +
  53. Thermodynamics

    Heyy, Okay so I have a question that I'm trying to figure out how to do and I'm really lost, I was hoping somebody might be able to give me a hand. Thanks in advance. The question in general is, I know that the vapour pressure of CCl4 is 98mmHg at 25
  54. physics

    The position of a toy locomotive moving on a straight track along the x-axis is given by the equation x = t4 − 6 t2 + 9 t , where x is in meters and t is in seconds. The net force on the locomotive is equal to zero when t is equal to
  55. physics14

    a non uniform bar which is 3m long weighs 60n. if the center of gravity is 1.1m from the larger end. and if the bar is supported at the midpoint, what load must be suspended at the smaller end to maintain equilibrium?
  56. physics

    (a) How much heat (J) flows from 1.00 kg of water at 46.0°C when it is placed in contact with 1.00 kg of 18°C water in reaching equilibrium? (b) What is the change(J/K) in entropy due to this heat transfer? (c) How much work (J) is made unavailable,
  57. physics

    When an object is moving in a simple harmonic motion, which of the following is at a minimum when the displacement from equilibrium is zero? A. the magnitude of the velocity B. the magnitude of the acceleration C. the kinetic energy D. the total mechanical
  58. physics

    (a) How much heat (J) flows from 1.00 kg of water at 46.0°C when it is placed in contact with 1.00 kg of 18°C water in reaching equilibrium? (b) What is the change(J/K) in entropy due to this heat transfer? (c) How much work (J) is made unavailable,
  59. physic

    Hi! Help me please, thank you so much. What mass of water at 28.0 °C must be allowed to come to thermal equilibrium with a 2.05-kg cube of aluminum initially at 1.50 102 °C to lower the temperature of the aluminum to 54.8 °C? Assume any water turned to
  60. chemistry

    What information does this value of Kc indicate with regard to the amount of NO(g)in the equilibrium mixture at a 25 degrees celcuis?THe cointainer is heated and the system reacheas a new equilibruim at 2500 degrees celcuis at this temperature there 0,4
  61. math

    A weight attached to a spring is pulled down 4 inches below the equilibrium position. Assuming that the frequency of the system is 8/pi cycles per second, determine a trigonometric model that gives the position of the weight at time t seconds.
  62. physics 2

    if 120 g of hot water at 85 degree celsius is poured into an insulated cup containing 200 g of ice at 0 degree celsius. how many grams of liquid will there be when the system reaches thermal equilibrium?
  63. chemistry

    The volume occupied by the reaction SiF4(g)+2H2O (g)=SiO2 (s)+4HF (g). is reduced.Predict the direction of shift in the position of equilibrium.Will the shift be in the direction of the more gaseous molecules,or fewer?
  64. Thermochemistry

    If a chalice made of pure gold weighing 1.24 kg and initially at 15 C is filled with 100.0 mL of water at 89 C, what is the final equilibrium temperature of the system? The heat capacities of water and gold are 75.29 and 25.42 J/mol/K, respectively.
  65. Physics

    The drawing shows two fully charged capacitors (C1 = 7 µF, q1 = 4 µC; C2 = 16 µF, q2 = 4 µC). The switch is closed, and charge flows until equilibrium is reestablished (i.e., until both capacitors have the same voltage across their plates). Find the
  66. physics

    (a) How much heat (J) flows from 1.00 kg of water at 46.0°C when it is placed in contact with 1.00 kg of 18°C water in reaching equilibrium? (b) What is the change(J/K) in entropy due to this heat transfer? (c) How much work (J) is made unavailable,
  67. physics

    (a) How much heat (J) flows from 1.00 kg of water at 46.0°C when it is placed in contact with 1.00 kg of 18°C water in reaching equilibrium? (b) What is the change(J/K) in entropy due to this heat transfer? (c) How much work (J) is made unavailable,
  68. math

    A weight attached to a spring is pulled down 4 inches below the equilibrium position. Assuming that the frequency of the system is 8/pi cycles per second, determine a trigonometric model that gives the position of the weight at time t seconds.
  69. math

    A weight attached to a spring is pulled down 4 inches below the equilibrium position. Assuming that the frequency of the system is 8/pi cycles per second, determine a trigonometric model that gives the position of the weight at time t seconds.
  70. physics

    When an object is moving in a simple harmonic motion, which of the following is at a minimum when the displacement from equilibrium is zero? A. the magnitude of the velocity B. the magnitude of the acceleration C. the kinetic energy D. the total mechanical
  71. Physics

    A small 9g plastic ball is suspended by a 35 cm long string in a uniform electric field 1110 N/C as shown. The ball is in equilibrium when the string makes a 23 degree angle with the vertical.
  72. physics

    (a) How much heat flows from 1.00 kg of water at 46.0°C when it is placed in contact with 1.00 kg of 18°C water in reaching equilibrium? (b) What is the change in entropy due to this heat transfer? (c) How much work is made unavailable, taking the lowest
  73. Chemistry (molarity) (sorta an emergency)

    I'm doing a titration lab and writing a lab report where I'm sort of stuck on how exactly to find the concentration of HCl. These are the following info I have from the lab, Equation: HCl(aq)+NaOH(aq)-> H2O(l)+NaCl(aq) -Calculated molarity of NaOH
  74. chemistry,

    in analyzing household bleach. I have a flask that contains 10.00 mL diluted bleach + 0.4g KI + 20 mL distilled water and 20 drops of 2M HCl. To that I titrated 30.60 mL Na2S2O3 and I need to calculate the number of moles of NaOCl reacted. This is what I
  75. algebra

    1. ratio a is equivalent to ratio b. ratio b is equivalent to ratio c. is ratio a equivalent to ratio c? 2. you are 13 years old, and your cousin is 19 years old. as you grow older, is your age proportional to your cousin's age?
  76. Algebra II

    The problem states: Saturn is approximately 1.4x 10 to the 9th power kilometers from the Sun. If light travels at approx. 3.0 x 10 to the 5th power kilometers per second, how long does it take light from the Sun to reach Saturn? Express your answer in
  77. algebra

    The length of a shadow of a building is 50 ft. Also, tan P = 0.8. 1.Write an equation involving a trigonometric ratio that can be used to find the height x of the building. Explain why your equation is correct. 2.Find the height x of the building by using
  78. trigonometry

    solve the equation: 4 tan^2 x + 12 sec x +1 =0, for 0 degrees is less than or equal to x is less than or equal to 360 degrees.
  79. UIC

    Calculate pCd2 at each of the following points in the titration of 55.00 mL of 0.0020 M Cd2 with 0.0020 M EDTA in the presence of the auxiliary complexing agent NH3. The solution is buffered at a pH of 11.00. Take the NH3 concentration to be a constant
  80. Chemistry

    The chemical equation for ionic reaction between Na2S and AgNO3??
  81. chem

    nicl2.6h2o + h2o+ nh3 chemical equation?
  82. chemistry

    what is meant by the term coefficient in relation to chemical equation
  83. science

    balance the chemical equation __MgO + Cl --> __MgCl + __O 2 2 2
  84. chemistry

    Balance the following chemical equation: C3H7OH(l) + O2(g) CO2(g) + H2O(g)
  85. Chemistry-please help quick!!

    Write the balance chemical equation for lime.
  86. chemistry

    Could you please explain to me how to balance a chemical equation? I've been trying to figure it out, but I can't seem to understand it at all.
  87. chemistry

    what is the chemical word equation for neutralizing acid spills? Please help me!!
  88. mathematics

    express as a single fraction:X to power -1/3 times Y to power 1/3 minus X to power 2/3 times Y to power -2/3.
  89. Physics

    A 2kg block is in equilibrium on an incline of 60 degrees. find fn of the incline on the block
  90. physics

    A charge of 2.0 nC and a charge of 5.3 nC are separated by 41.80 cm. Find the equilibrium position for a -4.7 nC charge. ___ cm from the 2.0 nC charge.
  91. Chemistry

    1. Which of the following will result in a chemical change? A. Melting ice to obtain water B. Evaporating alcohol into vapor C. Drying wood in a shed D. Burning coal in a furnace(My answer) 2. A salt is obtained as a reaction between A. a nonmetal and a
  92. chemistry

    A balloon has a volume of 2.75 liters at 25 degree celcus. What would the balloons volume be if the temperature is raised to 95 degree celcus and the pressure remains constant? please provide steps to get to answer
  93. MATH!+ check please~ thanks in advance!

    the equation 2x^2+ cy^2+Dx+Ey+f= 0 represent a conic. state the value(s) of C for which each of the following are possible: A circle: My answer: c= 2 an ellipse: My answer: c>0, cant equal 2 Parabola: My answer:c=0 a hyperbola: My answer: c<o ( any
  94. English

    1.Tiny Tim was destitute. His clothing was in tatters. Which sentence combines the two sentences using a past participle? Tiny Tim's tattered clothing showed he was destitute. THIS ONE Tiny Tim was destitute, and his clothing was in tatters. Tiny Tim's
  95. Chemistry

    After taking a medication its concentration in the bloodstream behaves as shown in the graph 650x/(x^3+200), where the x values are hours since first taking the medication and y is the concentration of the medication (mg/cc) in the blood stream after the
  96. Chemistry

    After taking a medication its concentration in the bloodstream behaves as shown in the graph 650t/(t^3+200), where the x values are hours since first taking the medication and y is the concentration of the medication (mg/cc) in the blood stream after the
  97. chemistry

    (a) Certain alloys such as LaNi5 can store hydrogen at room temperature. A plate of LaNi5 containing no hydrogen is placed in a chamber filled with pure hydrogen and maintained at a constant pressure. At what depth from the surface will the concentration
  98. Algebra

    PLEASE HELP! 1. Part 1: Using the digits 4 and 10, and the variable x, write an equation and solve. Part 2: Using the digits 4 and 10, and the variable x, write an expression and simplify if neccessary. 2.Equation: 10 + 4 = x 14=x Expression: 10(4 + x)
  99. Physics (Please)

    I'm confused and am hoping someone could help me understand energy can neither be created nor destroyed... great... so in physics classes we can set up problems and stuff were KEo + PEo = KE + PE Energy intial equals energy final sense energy is conserved
  100. physics

    A generating station is producing 1.3*10^6 W of power that is to be sent to a small town located 7.0 km away. Each of the two wires that comprise the transmission line has a resistance per kilometer of length of 5.0*10^-2 /km. (a) Find the power lost in