krystal

Popular questions and responses by krystal
  1. chemistry

    Magnesium reacts with iron(II) chloride according to the equation Mg(s) + FeCl2(aq) → MgCl2(aq) + Fe(s) a. Is magnesium oxidized or is it reduced? Magnesium is reduced. b. Is iron(II) ion oxidized or is it reduced? Iron(II) ion is oxidized . c. What is

    asked on February 11, 2012
  2. physics

    if Royce was 10 years old and he had a mass of 30kg. but by the time he turned 16 his mass has grown to 60kg. how much larger is the gravitational force between Royce and earth at age 16 compared to age 10

    asked on March 11, 2013
  3. chemistry

    Mercury reacts with oxygen to produce mercury(II) oxide. Hg(l) + O2(g) → HgO(s) a. Balance the reaction equation. Include physical states. 2Hg(l) + O2(g) → 2HgO(s) b. What is the theoretical yield (in grams) of HgO if 255 g of Hg are reacted with 255 g

    asked on February 14, 2012
  4. chemistry

    In the reaction below: Increasing the concentration of Cl2 will _____ at equilibrium. HAVE NO EFFECT

    asked on February 26, 2012
  5. math

    Find the sequence of the first five partial sums S1, S2, S3, S4, and S5 of the geometric sequence by adding terms. 9, 12, 16, 64/3, 256/9,... S1 = S2 = S3 = S4 = S5 =

    asked on May 11, 2018
  6. chemistry

    Name each of the following ionic compounds or binary molecules. a. SF2---Sulfur difluoride b. MgF2---Magnesium fluoride c. SnCl2----Tin (II) Chloride d. PF5-----Phosphorus Pentafluoride e. NO2-----Nitrogen Dioxide f. SnO2-----Tin (II) Oxide

    asked on February 8, 2012
  7. chemistry

    Which of the following atom pairs would most likely be connected by an ionic bond? K and Br S and Br O and Br F and Br

    asked on February 6, 2012
  8. Earth Science

    How tall in miles would a stack of 4.5 billion pennies be?

    asked on May 11, 2009
  9. chemistry

    Give the formula for the conjugate base of each acid. a. HSO4- H2SO4- b. H3PO4 H4PO4 c. HPO42- H2PO42- d. HNO3 H2NO3

    asked on February 26, 2012
  10. Chemistry

    Both carboxylic acids and phenols react with strong bases to produce _____. gaseous products the conjugate base of the carboxylic acid or phenol a complex with water a stronger acid or phenol

    asked on March 22, 2012
  11. chemistry

    Which of the molecules can form a hydrogen bond with a water molecule? 1. CH3OH 2. CH2=CHCH3 3. CH3CH2SH 4. CH3OCH3

    asked on March 1, 2012
  12. chemistry

    What is reduced and what is oxidized in the reaction? 2Mg+O2=2MgO Oxygen is oxidized Mg is reduced

    asked on February 28, 2012
  13. chemistry

    Which of the following atom pairs would most likely be connected by a covalent bond? K and F O and Cl Na and O Na and Cl

    asked on February 8, 2012
  14. math 11

    Calculate the interest due on the following credit card balances. a)An unpaid balance of $1623.53 at a rate of 19.50% for 21 days. b)An unpaid balance of 2639.99 at a rate of 22.95% for 30 days.

    asked on April 9, 2012
  15. chemistry

    In this equation is Fe(OH)3 and NaCL a solid liquid gas or aqueous? FeCl3 (aq) + 3NaOH(aq)=Fe(OH)3+NaCl

    asked on February 28, 2012
  16. chemistry

    a. Cl2 + 2NaI → 2NaCl + I2 This is a single replacement reaction. b. 2K + 2HCl → 2KCl + H2 This is a single replacement reaction. c. N2 + 3H2 → 2NH3 This is a synthesis reaction. d. 2KClO3 → 2KCl + 3O2 This is a decompisition reaction

    asked on February 11, 2012
  17. Physics desperate Help!

    A 2.0 kg lunch box is sent sliding over a frictionless surface, in the positive direction of an x axis along the surface. Beginning at time t=0, a steady wind pushes on the lunchbox in the negative direction of the x-axis. Estimate the kinetic energy of

    asked on October 26, 2006
  18. Physics, Desperate Need of help!

    Gold, has a mass of 19.32g for wach cubic centimeter of volume, is most ductile metal and can be pressed into a thin leaf or drawn out into long fiber. -If a sample of gold, with a mass of 27.63g is pressed into a leaf of 1.000micometers thickness, what is

    asked on August 31, 2006
  19. chemistry

    What are [H+] and [OH-] for 0.01 M perchloric acid

    asked on May 15, 2013
  20. pre cal

    At a distance of 100 feet, the angle of elevation from the horizontal ground to the top of a building is 42 degrees. Find the height of the building

    asked on November 7, 2012
  21. chemistry

    A bottle of 80 proof alcohol is 40% ethanol and 60% water. What is the solvent in this solution? water

    asked on February 21, 2012
  22. math

    Find the indicated term of the geometric sequence. a1 = 7, a4 = 189/8 , 8th term

    asked on May 11, 2018
  23. Math

    The temperature on Monday was 14°C. On Tuesday the temperature decreased by 5°. On Wednesday the temperature decreased another 10°. On Tuesday the temperature increased by 8°. What was the temperature at the end of the day on Thursday.

    asked on October 18, 2017
  24. Math

    Find the largest positive integer that leaves the same remainder when divided into each of 889, 961, 1009, and 1189

    asked on February 7, 2014
  25. writing process part 1

    I need this paragraph proof read if that's OK. also need to know if it's a fully devolved the topic a high school diploma is important to my future. A high school diploma is important to my future for a number of reasons. The First being to attend college

    asked on June 18, 2013
  26. physics

    A 0.112 kg meterstick is supported at its 38.6 cm mark by a string attached to the ceiling. A 0.655 kg mass hangs vertically from the 4.74 cm mark. A mass is attached somewhere on the meterstick to keep it horizontal and in both rotational and

    asked on November 4, 2012
  27. chemistry

    Calculate the pH of a 0.0019 M HNO3 solution.

    asked on February 29, 2012
  28. chemistry

    CH4 + 2 O2 = CO2 + H2O Carbon is being oxidized Oxygen is being reduced

    asked on February 28, 2012
  29. chemistry

    Which is the conjugate base of the bicarbonate ion, HCO3-? CO3 2-

    asked on February 26, 2012
  30. chemistry

    A water sample taken from the ocean is 36 ppt salt content. What is the mass of salt present in a liter of this ocean water? 36g

    asked on February 22, 2012
  31. chemistry

    What happens to the solubility of oxygen gas (O2) in water in each situation? a. The pressure of O2 over the solution is decreased. solubility decreases solubility remains the same solubility increases b. The temperature is decreased. solubility remains

    asked on February 21, 2012
  32. chemistry

    Consider the following reaction. 2KClO3(s) → 2KCl(s) + 3O2(g) a. How many grams of KCl are produced from the complete reaction of 2.16 mol of KClO3? 161g b. How many grams of KCl are produced from the complete reaction of 52.7 g of KClO3? 32.1 g

    asked on February 13, 2012
  33. chemistry

    Write the formula of the ionic compound that forms between a. copper(I) ions and chloride ions---CuCl b. copper(II) ions and hydrogen sulfate ions--Cu(HSO4)2 c. lithium ions and iodide ions--LiI d. cobalt(III) ions and phosphate ions---CoPO4

    asked on February 6, 2012
  34. Physics

    A 40kg block is pushed along a level surface with a 200 N force at an angle of 35 degrees below the horizon. The coefficient of kinetic friction between the block and the surface is 0.15. What is the normal force acting on the block? What is the force of

    asked on February 5, 2012
  35. chemistry

    Write the equation for the reaction, if any, that occurs when each of the following experiments is performed under standard conditions. a) crystals of iodine are added to an aqueous solution of potassium bromide. b) liquid bromine is added to an aqueous

    asked on May 13, 2007
  36. physics, please reply.

    block 1 of mass 1 slides from rest along a frictionless ramp from height h=2.50m and then collides with stationary block 2, which has mass2=2.00 m1. After the collision, block 2 slides into a region where the coefficient of kinetic friction is 0.500 and

    asked on November 10, 2006
  37. Physics HELP A,S.A.P!

    Q: Tarzan, who weighs 688N, swings from a cliff at the end of a vine that is 18m long. From the top of the cliff to the bottom of the swing, he descends by 3.2m. The vine will break if the force on it exceeds 950N. a)Does the vine break? b) If no, what is

    asked on November 2, 2006
  38. Physics please help

    An ant travels 2.78 cm (West) and then turns and travels 6.25cm (south 40 degrees East). What is the ant's total displacement?

    asked on September 29, 2014
  39. Math

    Find the largest positive integer that leaves the same remainder when divided into each of 889, 961, 1009, and 1189

    asked on February 7, 2014
  40. Math

    Show that the equation 155x -465y 35 has no integer solutions

    asked on February 7, 2014
  41. Math

    In how many ways is it possible to spend exactly $200 on pumpkins if large pumpkins cost $5 and small $3

    asked on February 7, 2014
  42. Algebra 2

    At the ruins of Caesarea, archaeologists discovered a huge hydraulic concrete block with a volume of 945 cubic meters. The block's dimensions are x meters high by 12x - 15 meters long by 12x - 21 meters wide. What is the height of the block? Can someone

    asked on October 9, 2013
  43. Algebra 2

    How do you get the real-number solutions of 5b^3 + 15b^2 + 12b = -36? I get to (b+3)(5b^2 + 12) and I don't know what to do after that. Can someone please show me how to finish this problem?

    asked on October 9, 2013
  44. Algebra 2

    For the period 1990-2002, the number s (in thousands)lf cellular telephone subscribers in the United States can be modified by S=858t^2 + 1412t + 4982 where t is the number of years since 1990. In what year did the number of subscribers reach 50 million?

    asked on September 24, 2013
  45. biochemistry

    Why does a change in pH usually produce a change in the ability of an enzyme to act as a catalyst? A. When the pH changes, the enzyme may lose its native conformation and lose its ability to function as a catalyst. B. When the pH changes, enzymes are

    asked on April 27, 2012
  46. chemistry

    The kinds of interactions that exist between CH3COOH molecules include dipole-dipole (including hydrogen bonding) interactions and London forces.True or False Its false there are no hydrogen bonds?

    asked on March 5, 2012
  47. chemistry

    Give the formula for the conjugate base of each acid. a. HSO4- SO4^2- b. H3PO4 H3PO4 c. HPO42- PO4^2- d. HNO3 NO3^-

    asked on February 26, 2012
  48. Math/Trig

    Period: Asymptotes: Range: a) y= 2 sec (x) + 1 b) y= -2 csc (x - pi/2) c) y= 1 + tan (x + pi/4) d) y= 1/2 + csc (x - pi) + 1 e) y= cot (3x + pi) + 2 Any tips on drawing the graph?

    asked on February 26, 2012
  49. chemistry

    Water is amphoteric (can act as an acid or a base). a. Complete the chemical equation that shows water acting as a base. H2O + HCl ⇋ Cl- + H3O+ b. In this reaction, what is the conjugate acid of water? H3O+

    asked on February 26, 2012
  50. chemistry

    What mass of potassium chloride, a salt substitute often used by heart patients, can be produced directly from 5.2 g potassium and 7.9 g chlorine? 9.9 g

    asked on February 14, 2012
  51. chemistry

    Aluminum and oxygen react to form aluminum oxide. 4 Al + 3 O2 2 Al2O3 a. What is the limiting reactant if 36.4 g Al are reacted with 36.4 g of O2? O2 b. What is the theoretical yield of Al2O3, in grams? 68.8 g c. If 22.2 g of Al2O3 are obtained, what is

    asked on February 14, 2012
  52. chemistry

    Consider the following reaction. 4Fe + 3O2=2Fe2O3 a. How many moles of O2 are required to react completely with 29.8 mg of Fe? 4.00 x 10^-4 moles O2 b. How many grams Fe2O3, are produced from the complete reaction of 17.8 g of Fe? 25.4 g Fe2O3

    asked on February 14, 2012
  53. chemistry

    Aluminum metal reacts with oxygen gas (O2) to form aluminum oxide. a. Write a balanced equation for this oxidation-reduction reaction. (In this problem you need not worry about the physical state of the reactants or product.) 2Al+3O2=2Al2O3 b. which

    asked on February 14, 2012
  54. chemistry

    For the reaction between nitrogen and oxygen to form nitric oxide, beginning with 0.067 mol of N2, N2(g) + O2(g)= 2 NO(g) a. how many moles of O2 are required to completely consume the N2? b. how many moles of NO are obtained when the N2 is completely

    asked on February 13, 2012
  55. chemistry

    Predict the number of covalent bonds formed by each nonmetal atom. a. N-----3 bonds b. Cl-----1 bond c. S-----2 bonds

    asked on February 8, 2012
  56. Physics

    A motorist traveling at 30 m/s passes a parked police car. At the instant the motorist passes the police car, the police car starts chasing the motorist with an acceleration of 3 m/s^2. How far does the police car have to travel to catch the motorist?

    asked on February 5, 2012
  57. physics

    A ball is attached to the moving end of the 5-meter arm of a pendulum. The pendulum swings through a 90 degree arc once. How far in meters, does the ball travel?

    asked on January 28, 2011
  58. physics

    how long does it take a softball to cross homeplate at 43 feet if the ball is going 65 miles per hour?

    asked on September 12, 2010
  59. health

    all the parts of the endocrine ystem are made up of neurons

    asked on October 9, 2008
  60. Evil PHysics!!!!!!

    Hello, I am having trouble with this problem: During volcanic eruptions, chunks of solid rock can be blasted out of the volcano; these projectiles are called volcanic bombs. a)At what initial speed would a bomb have to be ejected, at angle (sigma0=35

    asked on September 30, 2006
  61. Sorry, Here's another question plus work

    1. Gold, has a mass of 19.32g for wach cubic centimeter of volume, is most ductile metal and can be pressed into a thin leaf or drawn out into long fiber. -If a sample of gold, with a mass of 27.63g is pressed into a leaf of 1.000micometers thickness, what

    asked on August 31, 2006
  62. Math

    Find graphing solutions to 4x-y=5

    asked on January 21, 2018
  63. Calculus 1

    A filter filled with liquid is in the shape of a vertex-down cone with a height of 12 inches and a diameter of 18 inches at its open (upper) end. If the liquid drips out the bottom of the filter at the constant rate of 5 cubic inches per second, how fast

    asked on October 3, 2017
  64. science

    need to make a silent proof box 15,000 cubic centimeters. What is the dimensions? I am having a hard time figuring it out.

    asked on April 9, 2016
  65. science

    titanium reacts with oxygen a chemical change or a physical change

    asked on September 27, 2015
  66. Business Managment

    I just want to know if these are right and if not, which ones I got wrong. 1.Based on a _______ statement, a company sets long-term _______ mutually agreed on by workers and management and, from these, sets specific, short-term _______. A. vision; goals;

    asked on September 9, 2015
  67. algebra

    what is the reciprocal of 5/x-1 + 3/x ?

    asked on September 1, 2015
  68. english

    If i wanted to write a history of summer.. how would i start it

    asked on July 10, 2015
  69. Finite Math

    State and perform the next elementary row operations that should be performed to put the matrix in diagonal form 1 2 -3 3 2 -4 6 8 3 6 15 12

    asked on July 2, 2015
  70. Math

    Use the table below to answer the following question. x: 1, 2, 3, 4 y: 1, 4, 9, 16 Which is NOT true about the above table? A: It shows a linear function. B: The variable x increases by 1 each time. C: The rate of change is not constant. D: The variable y

    asked on May 12, 2015
  71. math

    Kool Klothes has determined that the revenue function for selling x thousand pairs of shorts is R(x) = -5x^2 + 21x. The cost function C(x) = 2x + 10 is the cost of producing the shorts. a) How many pairs of shorts must the company sell in order to break

    asked on March 22, 2015
  72. Physics

    3. An 80 kg skier is skiing down a slope (assume its frictionless) as shown in the diagram. The skier then hits a patch of sandy snow that applies a constant frictional force of 320 N directed up the slope. a. What is the skiers acceleration before hitting

    asked on January 27, 2015
  73. Math

    Hi! Can you check my answers to this worksheet? They're the only questions I'm not positive about my answers on. 1. Compared to its parent function, describe the transformation of the following: y = -x3 + 2 A. Reflected with respect to x-axis, moved up 2.

    asked on January 24, 2015
  74. grade 7 math

    Uniform Motion Related Problem Port A is 25 km downriver from port B. At noon a tugboat leaves port B and travels upstream at 15 kph. At 3 p.m. a hyrodrofoil leaves Port A travelling upstream at 50 kph. At what time will the hydrofoil pass the tugboat?

    asked on January 19, 2015
  75. grade 7 math

    Uniform Motion Related Problem Jessie has a 15 km head start on Melvin. How long will it take Melvin to catch Jessie if the latter travels at 70 kph and the former at 100 kph?

    asked on January 19, 2015
  76. grade 7 math

    Uniform Motion Related Problem Two planes leave an airport at 2 p.m., one flying south at 450 kph, the other flying north at 675 kph. At what time will they be 3 600 apart?

    asked on January 19, 2015
  77. grade 7 math

    Uniform Motion Related Problem Two cars starting from the same point travel in opposite directions. Car A travels at 80 kph and car B at 110 kph. After how many hours will the cars be 760 km apart?

    asked on January 19, 2015
  78. grade 7 math

    Uniform Motion Related Problem Two cars, 210 km apart, met each other in 2 hours. If one car travelled at 60 kph, at what rate did the second car travel?

    asked on January 19, 2015
  79. grade 7 math

    Uniform Motion Related Problem Chester drove his car at 8:00 a.m. at speed of 45 km/hr. At 9:15a.m. Michael followed with his car. What should be Michael's speed so as to be able to overtake Chester at 1:00 p.m.? How far has Chester travelled when Michael

    asked on January 19, 2015
  80. grade 7 math

    Uniform Motion Related Problem A car travelling at 60 kph left town at 9:00 a.m. Another car travelling at 65 kph left the same place half an hour later to overtake the first. At what time did the second car overtake the first?

    asked on January 19, 2015
  81. grade 7 math

    Uniform motion Related Problem Five boy scouts biked to Caliraya lake at 5 km/h. their scout master gave them a ride back home in his pickup car, at 20 kph. Find the hiking time if it 6 hors longer than their riding time.

    asked on January 19, 2015
  82. International Law

    Hello, I am having a hard time in finding the prosecutors list of evidence in the The Prosecutor v. Callixte Mbarushimana case. I have read documents but it doesn't give a detail of the evidence submitted. Can you please help. Thank You

    asked on October 22, 2014
  83. International Law

    Hello, I am having a hard time in finding the prosecutors list of evidence in the The Prosecutor v. Callixte Mbarushimana case. I have read documents but it doesn't give a detail of the evidence submitted. Can you please help. Thank You

    asked on October 22, 2014
  84. physics PLEASE HELP

    Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North)

    asked on September 30, 2014
  85. Biology

    What happens to arterial PO2, PCO2, and H+ concentration during moderate excercise? How and why does this stimulate an increase in breathing rate?

    asked on September 8, 2014
  86. Civics

    Which best describes how the internet has contributed to cultural diffusion in the united states?

    asked on April 18, 2014
  87. Algebra 2

    How would you describe the pattern of this sequence? 2/3, 4/4, 6/5, 8/6, 10/7 The formula is 2n/n+2 where n is 1, 2, 3, 4, 5

    asked on February 12, 2014
  88. Biology

    Can someone please help me find a website? I am doing a project on Maple Syrup Urine Disease and need to find a website that says when the disease was first discovered or how long we have known about it.

    asked on February 11, 2014
  89. Math

    A simple calculation will reveal that 72 has 12 factors including 1 and 72. How many natural numbers less than 100 have 12 such factors

    asked on February 7, 2014
  90. math

    Value ways 2 3/5 miles each day.Bill runs 10 miles once every 4 days. In 4 days, who covers the greater distance?

    asked on February 5, 2014
  91. Computer Programming

    Professor Merlin has asked you to help him. He has 100 total students in his four classes but he is not sure that all of them took his last exam. He wants to average the grades for his last exam in all four sections of his medieval literature course and

    asked on January 29, 2014
  92. Math

    Let c be a constant. For what values of c can the simultaneous equations x – y = 2; cx + y = 3 have a solution (x, y) inside quadrant I

    asked on January 17, 2014
  93. Science?

    I'm doing a science experiment where I have to light an object on fire to do the experiment.. It can't be oil or electrical fire. So I need some objects I can light on fire. Such as a candle. But I can't use this one

    asked on January 16, 2014
  94. Chemistry

    A gas, Y, diffuses 1.05 times faster than SO2 gas at the same conditions. What is the molecular weight of gas Y?

    asked on December 3, 2013
  95. world history

    what are city states?

    asked on November 7, 2013
  96. world history

    list three environmental challenges facing the acient people of mesopotamia.

    asked on November 7, 2013
  97. Accounting

    The owner's equity of Logan's company is equal to one quarter of the total assets. Liabilities equal $60,000. What is the amount of owner's equity?

    asked on October 14, 2013
  98. Geography

    Does anyone know a good website that shows South American countries natural resources in detail?

    asked on October 7, 2013
  99. Geography

    I need a map of South America countries that shows their mineral deposits in details. Can someone please give me a website?

    asked on October 7, 2013
  100. Definitions

    I have looked and looked for 4 examples of a standalone computer but I have only found two. They are a fax machine, and TiVo box. Could someone please tell me what two more examples are?

    asked on October 3, 2013

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