Jazmin

Most popular questions and responses by Jazmin
  1. Chemistry

    compared to an ordinary chemical reaction, a fission reaction will 1 release smaller amounts of energy 2 release larger amounts of energy 3 absorb smaller amounts of energy 4 absorb larger amounts of energy is it 2 ?

    asked on May 5, 2011
  2. Chemistry

    How many CO2 molecules would be formed from the reaction mixture that produces the greatest amount of products? 2CH3OH(g)+3O2(g)--->2CO2(g)+4H2O(g) 3-CH3OH & 3-O2 or 1-CH3OH & 6-O2 or 4-CH3OH & 2-O2

    asked on April 2, 2010
  3. Chemistry

    IF 80mg of a radioactive element decays to 10mg in 30 minutes, the half-life of this element is a.10 min b.20 min c.30 min d.40 min the answer is a.10 min but i would like to know why, please help.

    asked on May 30, 2011
  4. Chemistry

    which process occurs in a controlled fusion reaction? 1 light nuclei collide to produce heavier nuclei. 2 heavy nuclei collide to produce lighter nuclei. 3 neutron bombardment splits light nuclei 4 neutron bombardment splits heavy nuclei. is it 1 ?

    asked on May 6, 2011
  5. Chemistry

    Assume equal aqueous concentrations of each of the following substances. Which has the lowest freezing point? C2H12O6 CH3OH C12H22O11 NaOH i say its NaOH am i right ?

    asked on February 23, 2011
  6. Chemistry

    In a sample of solid Al(NO3)3, the ratio of aluminum ions to nitrate ions is (1) 1:1 (2) 1:2 (3) 1:3 (4) 1:6

    asked on October 25, 2010
  7. Chemistry

    which substance has a definite shape and a definite volume at STP ? (1)NaCl(aq) (2)Cl2(g) (3)CCl4(l) (4)AlCl3(s) is it 4 because its a solid? Am i right ?

    asked on January 9, 2011
  8. chemistry please help

    Styrene, C8H8, is one of the substances used in the production of synthetic rubber. When styrene burns in oxygen to form carbon dioxide and liquid water under standard-state conditions at 25°C, 42.62 kJ are released per gram of styrene. Find the standard

    asked on October 17, 2010
  9. chemistry please help

    the enthalpy change when a strong acid is neutralized by base is -56.1 kJ/mol. If 135 ml of .450 M HI at 23.15 C is mixed with 145 of .500 M NaOH at 23.15 C What will the max temperature reached by the resulting solution? tamana: Assume the specific heat

    asked on October 17, 2010
  10. chemistry

    The solubility of NaCl in water is 35.7g NaCl/100g H2O. Suppose that you have 500.0g of NaCl. What is the minimum volume of water you would need to dissolve it all? (Assume that de density of water is 1.0 g/mL.)

    asked on February 19, 2011
  11. chemistry

    If 14.8 kJ of heat is given off when 1.6 g of HCl condesses from vapor to liquid, what is the delta Hcond. for this substance?

    asked on February 10, 2011
  12. Environmental science

    A municipal landfill has available space of 16.2 ha at an average depth of 10 m. Seven hundred sixty-five (765) m3 of solid waste is dumped at the site 5 days a week. The waste is compacted to twice its delivered density. Draw a mass-balance diagram and

    asked on January 28, 2011
  13. chemistry

    Suppose you have a mixture of hydrogen and methane (CH4) gases that are at equilibrium. What is the ratio of the average speed of the methane (CH4) relative to the hydrogen ? Express the answer as a fraction (e.g. 0.621). I know that im suppose to use the

    asked on October 10, 2010
  14. Business Math

    Treasure Mountain International School in Park City, Utah, is a public middle school interested in raising money for next year's Sundance Film Festival. If the school raises $2,989 and invests it for 1 year at 3% interest compounded annually, what is the

    asked on September 1, 2014
  15. Math

    Javier rides his bicycle at a rate of 15 miles per hour. Javier's speed is equivalent to _____ ft per speed.

    asked on May 15, 2017
  16. Chemistry

    100g of a clear liquid is evaporated and a few grams of white crystals remain. The original liquid wasa a) heterogeneous compound b) heterogeneous mixture c) homogeneous compound d) homogeneous mixture

    asked on October 17, 2010
  17. chem

    radiated food can be safely stored for a longer time because radiation 1. prevents air oxidation 2. prevents air reduction 3. kills bacteria 4. causes bacteria to mutate is it 3 ?

    asked on May 10, 2011
  18. chemistry

    Write a balanced chemical equation for the overall cell reaction represented as: a) Ag(s)|Ag^+(aq)||Sn^4+(aq), Sn^2+(aq)|Pt(s) b) Al(s)|Al^3+(aq)||Cu^2+(aq)|Cu(s) c) Pt(s)|Fe^2+(aq), Fe^3+(aq)||MnO4^-(aq),Mn^2+(aq)|Pt(s)

    asked on March 1, 2011
  19. english

    Metaphors 1. Love is a lemon-either bitter or sweet this is the only one i couldn't find an answer to please help me thank you.

    asked on January 29, 2009
  20. Environmental science

    Estimate the chronic daily intake of 1,1,1-trichloroethane from exposure to city water supply that contains a 1,1,1-trichloroethane concentration equal to the drinking water standard of 0.2 mg/L. Assume the exposed individual is a child who consumes water

    asked on February 16, 2011
  21. chemistry

    Groundwater in Pherric, New Mexico, initially contains 1.800 mg/L of iron as Fe3+. What must the pH be raised to in order to precipitate all but 0.3 mg/L of the iron? The temperature of the solution is 25 degree Celsius.

    asked on January 21, 2011
  22. chemistry

    Ammonia gas can be prepared by the reaction CaO(s) + 2NH4Cl(s) -> 2NH3(g) + H2O(g) + CaCl2(s) If 112 g CaO reacts with 224 g NH4Cl, how many moles of reactants and products are there when the reaction is complete?

    asked on January 20, 2011
  23. physics

    a skier moving at 15 m/s down a 20 degree slope encounters a region of wet snow of coefficient of friction is 0.8. how far down the slope does she go before stopping

    asked on October 21, 2012
  24. chemistry

    If boron hydride, B4H10, is treated with pure oxygen, it burns to give B2O3 and H2O. 2 B4H10(s) + 11 O2(g)  4 B2O3(s) + 10 H2O(g) If a 0.050-g sample of the boron hydride burns completely in O2, what will be the pressure of the gaseous water in a 4.25-L

    asked on February 3, 2011
  25. Environmental engineering

    Lake Kickapoo, TX, is approximately 12 km in length by 2.5 km in width. The inflow for the month of April is 3.26 cubic meter per second, and the outflow is 2.93 cubic meter per second. The total monthly precipitation is 15.2 cm and the evaporation is 10.2

    asked on February 22, 2011
  26. Environmental science

    Each month the Speedy Dry Cleaning Company buys one barrel (0.160 m3) of dry cleaning fluid. Ninety percent of the fluid is lost to the atmosphere and 10% remains as residue to be disposed of. The density of the dry cleaning fluid is 1.5940 g/mL. Draw a

    asked on January 28, 2011
  27. math

    On a test you answered six 5-point questions and eight 2-point questions. You earned 92% of the possible points. How many points is the test worth?

    asked on January 29, 2017
  28. Chemistry

    a radioisotope is called a tracer when it is used to 1 kill bacteria 2 kill cancerous cells determine the age of animal skeletal remains 4 determine the path of an element in an organism is it 3 ?

    asked on May 10, 2011
  29. chemistry

    What is the wavelength of radiation that has a frequency of 6.912 × 10^14 s−1? and does the s-1 make a difference? Thank you!

    asked on October 31, 2010
  30. Math

    Which of the following transformations preserves the measures of the angles but changes the lengths of the sides of the figure?

    asked on May 21, 2019
  31. Environmental engineering

    The company you work for plans to release a waste stream containing 7 mg/L of benzaldehyde . Assuming that benzaldehyde degrades according to the reaction: C7H6O + 8O2 → 7CO2 + 3H2O Calculate the theoretical carbonaceous oxygen demand of this waste

    asked on February 26, 2011
  32. chemistry

    A chemical is placed in a beaker containing 20 g of soil and 500 mL of water. At equilibrium, the chemical is found in the soil at a concentration of 100 mg/kg of soil. The equilibrium concentration of this same chemical in the water is 250 µg/L.

    asked on January 21, 2011
  33. chemistry

    Write a balanced chemical equation for the overall cell reaction represented as: a) Ag(s)|Ag^+(aq)||Sn^4+(aq), Sn^2+(aq)|Pt(s) b) Al(s)|Al^3+(aq)||Cu^2+(aq)|Cu(s) c) Pt(s)|Fe^2+(aq), Fe^3+(aq)||MnO4^-(aq),Mn^2+(aq)|Pt(s)

    asked on March 1, 2011
  34. physical sciences

    The density of mercury is 13.54 g/cm3. Suppose you need 40 gm of mercury for an experiment. What volume of mercury do you need?

    asked on December 13, 2012
  35. chemistry

    The solubility of NaCl in water is 35.7g NaCl/100g H2O. Suppose that you have 500.0g of NaCl. What is the minimum volume of water you would need to dissolve it all? (Assume that de density of water is 1.0 g/mL.)

    asked on February 19, 2011
  36. Chemistry

    which isotope can be used as a tracer to study the age of organic material ? 1 C-12 2 C-14 3 Tc-99 4 U-238

    asked on May 10, 2011
  37. chemistry

    Convert the concentration of SO2 from 80µg/m^3 to units of parts per million. The gas has temperature of 25 degree Celsius and a pressure of 101.325 kPa.

    asked on January 21, 2011
  38. Environmental engineering

    (10 Points) A contractor is trying to estimate the distance to be expected of a drawdown of 4.81 m from a pumping well under the following conditions: Pumping rate = 0.0280 cubic meter per seconds Pumping time = 1066 d Drawdown in observation well = 9.52 m

    asked on February 23, 2011
  39. chemistry please help

    A 52.0 g piece of copper at 110.0 C is placed in 75.0 g of water at 20.0 C. What is the temperature (in C) of the water once the system reaches equilibrium? The molar heat capacity of copper is 24.5 J/(mol

    asked on October 31, 2010
  40. math models

    Tanisha wants to have $1000 in her bank account in 5 years. How much money should she deposit if her account earns 6% interest which is compounded 2 times per year?

    asked on December 12, 2011
  41. physics

    The anchor shackle supports a cable force of 600 lb. If the pin has a diameter of 0.25 in., determine the average shear stress in the pin.

    asked on January 27, 2011
  42. chemistry-check answer

    Suppose you have a 10 watt fluorescent light bulb. If this light bulb is 6 % efficient in turning electricity into light, then how many photons are being emitted per second? Assume that average energy of all the photons emitted is 550 nm, thus you can

    asked on October 31, 2010
  43. Physics

    A 6.7 kg package starts from rest and slides down a mail chute that is 50 m long and has a vertical drop of 10m. If the velocity of the package at the bottom of the chute is 4m/s what is the average frictional force on the package as i slides down the

    asked on October 21, 2012
  44. algebra

    Last month, your electric bill was $25.32 for 450 kilowatt-hours of electricity. At that rate, what would be the bill for 240 kilowatt-hours?

    asked on April 29, 2011
  45. chemistry

    One liter of a gas mixture at 0 degree Celsius and 108.26 kPa contains 250 mg/L of H2S gas. Calculate the partial pressure exerted by gas.

    asked on January 21, 2011
  46. chemistry

    Calculate the "exact" alkalinity of a water that contains 0.6580 mg/L of bicarbonate, as the ion, at a pH of 5.66.

    asked on January 21, 2011
  47. Math

    Jeremy got scores of 93,82,91, and 88 on his first four math test. What score must he get on the fifth test to have an average test grade of 90 for the five test ? Can someone explain step by step. Please

    asked on April 11, 2013
  48. science

    Each month the Speedy Dry Cleaning Company buys one barrel (0.160 m3) of dry cleaning fluid. Ninety percent of the fluid is lost to the atmosphere and 10% remains as residue to be disposed of. The density of the dry cleaning fluid is 1.5940 g/mL. Draw a

    asked on January 30, 2011
  49. chemistry

    Copper reacts with sulfuric acid according to the following equation: 2H3SO4 + Cu-> CuSO4 + 2H2O + SO2 How many grams of sulfur dioxide are created by this reaction if 14.2 g of copper reacts with 18 g of sulfuric acid?

    asked on January 20, 2011
  50. chemistry

    Ammonia gas can be prepared by the reaction CaO(s) + 2NH4Cl(s) -> 2NH3(g) + H2O(g) + CaCl2(s) If 112 g CaO reacts with 224 g NH4Cl, how many moles of reactants and products are there when the reaction is complete?

    asked on January 20, 2011
  51. Physics

    a 0.2kg rubber ball is dropped from the window of a building. It strikes the sidewalk below at 30 m/s and rebounds up at 25 m/s. If the ball is in contact with the sidewalk for 0.025s, what is the magnitude of the average force applied by the sidewalk on

    asked on October 21, 2012
  52. Chemistry

    As a substance changes from liquid to gas, the average distance between molecules (1) decreases (2)increases (3) remains the same

    asked on January 9, 2011
  53. chemistry

    5.50 grams of nitrogen triiodide are detonated in a closed 7.00 L flask that was under full vacuum initially. The nitrogen triiodide forms nitrogen gas and iodine gas upon detonation. What is the partial pressure of the iodine gas (in Pa) when the vessel

    asked on October 9, 2010
  54. math

    50-30-4×2+10 20-4 16×2+10 42 ???

    asked on February 4, 2015
  55. chemistry

    Chlorine is used to disinfect drink water supplies and pool water. Suppose you have 17.3 L of Cl2 in a cylinder at 1200 torr and 24 C. How many grams of chlorine do you have in the gas cylinder?

    asked on October 9, 2010
  56. Math

    What place value is ten times smaller than ten millions place? A) hundred trillion B) one trillion C) hundred billion D) ten billion I think it's ones place. But that's not an option, maybe they did a typo.

    asked on November 27, 2011
  57. chemistry

    Azomethane, CH3NNCH3, is not a stable compound, and once generated, it decomposes. The rate of decomposition was measured by monitoring the partial pressure of azomethane, in torr. Time (min) 0, 15, 30, 48, 75 Pressure(torr)36.2, 30, 24.9,19.3, 13.1

    asked on March 15, 2011
  58. engineering

    100 lb of loose gravel can fill a 1-ft^3 box. Its specific gravity is 2.68. What is the dry rodded weight?

    asked on February 5, 2011
  59. chemistry

    Another “grand challenge” for engineering is managing the nitrogen cycle. Use the nature of the chemical bond in diatomic nitrogen to explain why any management is needed for this biogeochemical cycle. With so much nitrogen available in the atmosphere,

    asked on February 3, 2011
  60. Chemistry

    the difference between the boiling point and the freezing point of pure water at standard pressure is (1)32 K (2)273 K (3)100 K (4)373 K

    asked on January 9, 2011
  61. Chemistry

    the difference between the boiling point and the freezing point of pure water at standard pressure is (1)32 K (2)273 K (3)100 K (4)373 K

    asked on January 9, 2011
  62. Chemistry

    A covalent bond forms when (1)two nuclei share electrons in order to achieve a complete octet of electrons (2) atoms form ions and then electrostatic forces of attraction bond the ions together. (3)repulsive forces between atoms are greater than the

    asked on December 2, 2010
  63. chemistry- thank you

    How much of a 0.23 M NaOH solution is needed to neutralize 27 mL of a 0.85 M sulfuric acid solution? The units are mL

    asked on October 31, 2010
  64. chemistry

    You mix 50 mL of 0.1 M ammonium phosphate with 75 mL of 0.05 M calcium nitrate. How much of a precipitate forms from this reaction (in grams)?

    asked on October 4, 2010
  65. Physics

    a 0.2kg rubber ball is dropped from the window of a building. It strikes the sidewalk below at 30 m/s and rebounds up at 25 m/s. If the ball is in contact with the sidewalk for 0.025s, what is the magnitude of the average force applied by the sidewalk on

    asked on October 21, 2012
  66. Chemistry

    which process occurs in a controlled fusion reaction? 1 light nuclei collide to produce heavier nuclei. 2 heavy nuclei collide to produce lighter nuclei. 3 neutron bombardment splits light nuclei 4 neutron bombardment splits heavy nuclei. is it 1 ?

    asked on May 5, 2011
  67. chemistry

    (10 Points) A water initially contains 50 mg/L of Mg 2+ The pH of the water is increased . until the concentration of hydroxide ion is 0.0005 M. Calculate the concentration (mg/L) of magnesium ion in this water at this pH. Assume that the temperature of

    asked on February 23, 2011
  68. math

    order the fractions from greates to least. 1/6, 2/7, 1/5. Can anyone help and explain this to me please

    asked on December 12, 2010
  69. chemistry- Thank you

    Suppose you add 81 ml of dilute acid to 54 ml of water. Both the water and acid were at room temperature (22 C) before being mixed. The temperature of the solution increased to 42 C. How much energy (in kJ) was released by the dissolution of the acid if

    asked on October 17, 2010
  70. math

    sums and differences of rational algebraic expression answer the following perform the indicated operation reduce answers to lowest term 2x/x^2-2x-15 - x-2/3x^2+9 another is t/2rs^2 - 2r/3rst + 3s/30r^2t another is 3x/2x-3 - 2x/2x+3 + 3/4x^2-9 please

    asked on October 8, 2010
  71. math

    my topic is all about sums and differences of a rational algebraic expression this is the problem 3a/ax+ay + 2a/ax+ay another problem is a/4a+1 + 2/4a^2-7a-2 another is 3/a-b + 4/a+2b please anyone else who can answer my assignment please HELP ME!

    asked on October 8, 2010
  72. Chemistry

    a solution weighs 44grams. this sample contains 12grams of salt calculate % m/m salt.

    asked on April 13, 2010
  73. Math

    How does estimating help you add two digit numbers

    asked on October 7, 2014
  74. Chemistry

    which of the following 10 g samples will decay the most in 28 days? a.P-32 b.Kr-85 c.Fr-220 I-131 the answer is c.Fr-220 but i want to know why, please help

    asked on May 30, 2011
  75. Chemistry

    K-42 has a half-life of 12.4 hours. If you begin with 250g of K-42, determine how much you will have left after 4 half-lives. How long does 4 half-lives take? please help

    asked on May 15, 2011
  76. Chemistry

    what is the primary result of a fisson reaction ? 1 conversion of mass to energy 2 conversion of energy to mass 3 binding together of two heavy nuclei 4 binding together of two heavy nuclei i think its 4, am i right ?

    asked on May 5, 2011
  77. chemistry

    The pH of a 0.10 M solution of ammonia is 11.1. Find the hydroxide concentration.

    asked on February 26, 2011
  78. pre-algebra

    Graph the equation. Tell whether the equation is a function. y = -x

    asked on February 24, 2011
  79. Chemistry

    which phase change is endothermic ? (1)gas-->solid (2)gas-->liquid (3)liquid-->solid (4)liquid-->gas

    asked on January 9, 2011
  80. question for DR.BOB

    where are you helping from? I'm just curious

    asked on October 31, 2010
  81. chemistry- thank you

    How many valence shell electrons are there in a ground state silicon atom? Am i suppose to just count the electrons after the core electrons?

    asked on October 31, 2010
  82. math

    please answer this my topic is all about sums and differences of rational algebraic expression perform the indicated operation reduce answer to lowest term 3/5 + 4/5 another is x/3 - y/3 another is 7/a + 2/a please answer it thanks!!!!!

    asked on October 8, 2010
  83. math

    please answer this my topic is all about sums and differences of rational algebraic expression 3/5 + 4/5 another is x/3 - y/3 another is 7/a + 2/a please answer it thanks!!!!!

    asked on October 8, 2010
  84. math

    sums and differences of rational algebraic expression please answer the following 9ab/cd^2 - 7ab/cd^2 another 3/x-1 - 2/x-1 another is 4x/4x-y - 2x/4x-y another is 3x/2y - 3x-2y/3x+2y another is 8/3x - 3/4x + 4/12x another is x-3/3x+1 + x+5/3x+1

    asked on October 8, 2010
  85. math

    can you answer this please about sums and differences of a rational algebraic expression this is the problem 5/x-7 - x-1/x-7 - 2+x/x-7 another is x+1/2 - x-2/3 + 2x-1/9 another is 2x+3/3 - 3x-1/2 + x-4/12

    asked on October 8, 2010
  86. math

    please is there anybody who can help me to do my assignment about sums and differences of a rational algebraic expression this is the problem.... x^2/x-y - y^2/x-y=? another is 3y/3y-5 - 5/3y-5=? another is 10/x-3 - 2x+9/x-3 + 5x-7/x-3 please answer

    asked on October 8, 2010
  87. math

    please can you answer this is all about sums and differences of rational algebraic expression...please i need it please ?this is the problem....3/5+4/5=? another x/3-y/3=? another is 7/a+2/a

    asked on October 8, 2010
  88. math

    please get the lcd of this rational algebraic expression 3x+2,2x/x^2-4,x+1/x^2+5x+6

    asked on October 7, 2010
  89. math

    can you answer this as soon as possible please just find the lcd of this rational algebraic expression 3x/x-4,2x/x+4

    asked on October 7, 2010
  90. math

    find the lcd of this rational algebraic expression 4/x+2,2/2-x,3/4-x^2 another rational algebraic expression you will also find the lcd 5/y+5,3y/2y+10,2/y+10

    asked on October 7, 2010
  91. math

    find the lcd of this rational algebraic expression 3x+2,2x/x^2-4,x+1/x^2+5x+6 please answer it immidiately i need the answer as soon as possible ..please?

    asked on October 7, 2010
  92. chemistry

    How much of a 0.25 M NaOH solution is needed to neutralize 100 mL of a 0.15 M HCl solution? The units are mL

    asked on October 3, 2010
  93. molarity

    calculate the molarity of a solution containing 4.50mmol of NaCl in 3.80mL of solution

    asked on May 17, 2010
  94. English

    Analogies 1.Advent:arrival::exaggeration:____ 2.Allude:hint::____:self evident I need help making similies i don't quite understand how to do them. Metaphors 1.Leaping with laughter 2.Life has a tendency to come back and bite you in the rear Idioms 1.A

    asked on February 5, 2009
  95. Math

    A snack bar sells ice snow cones. An ice cube has a side length of 24 centimeters.after shaved all linear dimensions of the ice cube are 1/4 of original dimension

    asked on September 2, 2016
  96. Science (Physics)

    A 33.3 kg cyclist is riding a 10.7 kg bicycle at a velocity of 7.0 m/s. If the cyclist applies a brake that applies a force of 42.7 N, what is the time required for the cyclist to come to a stop?

    asked on May 27, 2015
  97. math

    what is the answer to x-3=-1

    asked on January 6, 2013
  98. Math

    Kayla is 5 feet tall, and Maria is 5.5 feet tall. Kayla's shadow at 3pm outdoors measured 3feet. The length of each persons shadow is proportionate to her height. How many feet long is Maria's shadow at 3pm.

    asked on December 30, 2011
  99. math

    Dominoes pizza offers 30 different types of pizza and 9 of them contain pepperoni. what percentage of their total number of pizza types have pepperoni on it? Can someone explain to me the procedure please

    asked on November 3, 2011
  100. math

    determine the value of N: N/20 * 100%=60% can someone explain

    asked on November 1, 2011

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