San

Most popular questions and responses by San
  1. ua

    Assume you are performing the calibration step of Experiment 8 and you begin with 70 g of water at 20 oC and 70 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment,

    asked on October 31, 2012
  2. Chemistry

    A 0.100g sample of a compound containing C, H, and O is burned oxygen producing 0.1783 g of CO2 and 0.0734 g of H2O. Determine the empirical formula of the compound.

    asked on July 18, 2011
  3. Biochemistry

    Calculate the amount (in grams) of Tris Base needed to make 1L of 0.01M Tris buffer? Tris Base=121.4 g/mol

    asked on September 10, 2015
  4. chemistry

    Ammonium hydrogen phosphate, a common fertilizer, is made from reacting phosphoric acid with ammonia (NH3). If 10.00g of ammonia react, how many grams of fertilizer will be produced?

    asked on February 10, 2015
  5. Chemistry

    How many grams of PbCO3 will dissolve in 1.00L of 1.00M H+ is added to 5.00g of PbCO3?? PbCO3(s) + 2H+ (aq) -> Pb2+ (aq) + H2O (l) + CO2 (g)

    asked on July 18, 2011
  6. chemistry

    Assume you are performing the calibration step of Experiment 8 and you begin with 70 g of water at 20 oC and 70 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment,

    asked on November 1, 2012
  7. chemistry

    PCL5(g) -> PCl3(g) + Cl2 (g) Kp= 23.6 at 500K Calculate the equlibrium partial pressures of the reactants and products if the initial pressures are Ppcl5 = 0.560atm and Ppcl3 = 0.500atm.

    asked on August 3, 2011
  8. Physics

    A force of 3.0 newtons applied to an object produces a change in velocity of 12 meters per second in 0.40 second. the mass of the object is? I am not sure how to solve this problem. Formula for momentum is p= mass times velocity impulse (J) = Fnet times

    asked on January 5, 2013
  9. Physics

    A commercial resistor can safely dissipate power only up to a certain rated value. Beyond this value, the resistor becomes excessively hot and often cracks apart. The resistor used in this experiment was rated by the manufacturer to be a 2 watt resistor.

    asked on February 23, 2010
  10. chemistry

    when 1.40 g of hydrated magnesium salfate is heated to constant mass, 0.68 g of the anhydrous salt remains. find the formula for the hydrated magnesium sulfate. MgSO4*xH2O ==> MgSO4 + xH2O grams water = 1.40 - 0.68 = ?? mols H2O = ??/molar mass H2O. mols

    asked on March 17, 2007
  11. math

    A bank wonders whether omitting the annual credit card fee for customers who charge ar least $3000 in a year will increase the amount charged on its cards. The bank makes this offer to an SRS of 400 of its customers. It then compares how much these

    asked on July 4, 2017
  12. Biology

    do you know if there are any good websites on population distrubution patterns and relevant adaptations of organisms? You need to choose a population. A species of orchids? A species of animals (kangaroo, etc)? A type of bird? A disease vector ? Make a

    asked on March 19, 2007
  13. Chemistry

    enthalpy of combustion kj mol H2 + 1/2 o2 = h20 + 286 kJ how much did you see? 62.4 ml H2 1 mol of any gas at NTP = 24.5 L You need to clarify your question. Also define NTP.

    asked on March 8, 2007
  14. chemistry

    A 1.0 g sample of food reacts with oxygen in a calorimeter containing 500 g of water. The temperature rises 10°C. What is the energy content of the food?

    asked on August 12, 2017
  15. Physics

    A hot air balloon containing an AP Physics student ascends vertically at a constant speed of 8 m/s. While ascending, he accidentally drops his rubber duckie from the gondola of the ballong. Seven seconds after it is dropped the duckie bounces off a roof at

    asked on September 16, 2012
  16. Economics

    What is an oligopoly? A. An agreement by a formal organization of producers to coordinate prices and production B A market structure in which a few large firms dominate the market C A market structure in which two firms have a price way D a market

    asked on December 15, 2014
  17. physics

    A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 67.6° above the horizontal. The rocket is fired toward an 11.0 m high wall, which is located 29.5 m away. By how much does the rocket clear the top of the wall?

    asked on September 17, 2010
  18. Biosci 101

    Hi there :)I was just wondering if you knew how the lac operon theory works? And if there are any good websites for this? This is the best one I could find. http://www.dartmouth.edu/~cbbc/courses/bio4/bio4-lectures/ProkGeneControl.html Most sites discuss

    asked on March 16, 2007
  19. Chemistry

    Hoffmans apparatus find out the energy available per mole of water if it is split into h2 and o2 Data 1 mol of gas at NTP is 24.5l 31.2ml of _______ 62.4ml of _______ it looks like this question comes from a lab experiment. You have not provided all the

    asked on March 7, 2007
  20. English Essay

    hello everyone...all my time spent on net surfing for if i can find some help with my HM essay....on Man to Man/Women to Women. please if someone can help out with this..i really appreciated. i m not really good on writing essay but i m looking for some

    asked on February 24, 2007
  21. physics

    The temperature of 6.80 mol of an ideal monatomic gas is raised 12.0 K in an adiabatic process. What are (a) the work W done by the gas, (b) the energy transferred as heat Q, (c) the change ΔEint in internal energy of the gas, and (d) the change ΔK in

    asked on November 11, 2010
  22. Business 210

    Review the business in action case studies on pp.143,.146,.154, and 159 of the text in Cpt3 select one case that you find especially interesting and explain how ethics and decision making effect the individuals involved in the scenario.

    asked on November 2, 2009
  23. chem

    how do u calulate percentage composition of NO2 [mass N/mass NO2] x 100 = %Nitrogen [mass O2/mass NO2] x 100 =%oxygen

    asked on March 17, 2007
  24. Stats

    Urn 1 contains 3 green balls and 5 white balls, and Urn 2 contains 2 green balls and 4 white balls. A ball is drawn from each urn. What is the probability that both balls are green?

    asked on August 12, 2016
  25. finance

    The Nutrex Corporation wants to calculate its weighted average cost of capital. Its target capital structure weights are 40 percent long-term debt and 60 percent common equity. The before-tax cost of debt is estimated to be 10 percent and the company is in

    asked on September 12, 2012
  26. chem

    When a bond forms between C(H3) and MgBr, why would MgBr have a partial positive charge?

    asked on September 6, 2011
  27. Chemistry

    On top of one of the peaks in Rocky Mountain National Park the pressure of the atmosphere is 500. torr. Determine the boiling point of water at this location. The heat of vaporization of water is 40.7 kj/mol.

    asked on July 20, 2011
  28. chemistry

    what particles with electrical charges repel one another

    asked on September 14, 2010
  29. English

    I have to write and essay on similarity and difference. What are some points to writing paragraphs for the body?

    asked on July 8, 2008
  30. Science/maths

    what are some problems you might encounter when a)finding the volume of a rugby ball b)finding the diameter of a tennis ball c) finding the mass of a grain of sugar can you help me then I help you please w/b a) submerge it in water in a graduated container

    asked on March 3, 2007
  31. english essay

    Here is a sample outline for the essay: Introduction: Topic: male/female communication Comparison of two articles (state article names) state thesis Body: Summarize both articles Comapare and contrast both articles argue for which one is better provide

    asked on February 25, 2007
  32. Economics

    according to the law of supply the higher the price A the more consumers are willing to pay B the larger the quantity produced c the smaller the quantity produced D the more the availability of a good is reduced

    asked on December 15, 2014
  33. Spanish

    11. Si ---------- el número de mi jefe, le -------- para decirle que no puedo ir al trabajo hoy. A. sabría, llamara B.llamaría, supiera C. supiera, llamaría D.llamara, sabría My Ans: C 12. ------------ a la fiesta si ----------- encontrar un vestido

    asked on August 17, 2012
  34. Maths

    if the ratio of the length to the breadth of a rectangle be 5:3 and its perimeter is 144m, find the length of the rectangle .

    asked on February 4, 2012
  35. chemistry

    How do I draw Lewis Structure for BN and CN-

    asked on August 18, 2011
  36. BUSINESS

    WHAT ARE the pros and cons of the following statement: “Egalitarian companies are more innovative.”

    asked on February 5, 2011
  37. english

    the term freewriting refers to?

    asked on January 20, 2009
  38. Public Administration

    Does Jiskha have Public Administration or Organizational Behavior experts available? Or. is there an expert on public sector OB and public sector finance? Not exactly. The closest is one person has a Masters in Systems Management (UnivSouthernCal).

    asked on April 6, 2007
  39. physics conclusion

    im not quite sure what to write for my conclusion for this physics experiment. The aim is to record measurements and carry out calulations with the correct number of figures. We had to take a brass rod and measure its width with vernier calipers which was

    asked on March 10, 2007
  40. English Essay

    When it comes to conversation, husband and wives often have problems that close friends of the same sex don't have. First, they may not have much to talk about, and second when they do talk. misunderstanding s often developed that lead to major fights. our

    asked on February 24, 2007
  41. physics

    A body at rest explodes into three equal parts, two parts after explosion fly off due north and west respectively with velocity 8m/s then calculate the magnitude and direction of velocity of 3rd pat.

    asked on November 29, 2016
  42. Algebra 2

    Let F(x) = -5x-4 and g(x) = 6x-7 find the f(x)+g(x) 1.-11x+3 2.x+3 3.-11x-11 4.x-11

    asked on January 14, 2015
  43. physics

    The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates

    asked on November 3, 2014
  44. PHYSICS

    A SPRING WITH A CONSTANT K = 8N/m IS STRETCHED 5CM AND RELEASED. IT BOBS UP AND DOWN EVERY 2.5 SECONDS. WHAT IS ITS FREQUENCY, PERIOD, ABD AMPLITUDE

    asked on May 8, 2013
  45. Spanish help please

    Si ---------- el número de mi jefe, le -------- para decirle que no puedo ir al trabajo hoy. sabría, llamara llamaría, supiera supiera, llamaría llamara, sabría 12. ------------ a la fiesta si ----------- encontrar un vestido apropiado para llevar. A.

    asked on August 17, 2012
  46. fin decision making for managers

    Aberdeen Corp. uses activity-based costing system with three activity cost pools. The following cost information is provided: Wages and salaries $ 220,000 Depreciation 120,000 Utilities 100,000 Total $440,000

    asked on November 26, 2011
  47. Chemistry

    Is it possible to calculate heat of vaporization if i only have pressure and temperature.

    asked on July 20, 2011
  48. math

    2 person in a business. first pur $100& gets $120 and second puts $80 and gets $100. Who gains more and by what percentage?

    asked on May 13, 2010
  49. physics

    why are ice packs at 0 degree better for cooling a sprained ankle than similar sized packs containing water at 0 degree? thanks Ice has much more thermal capacity to cool. Consider the heat that has to be removed at 0C to turn to ice, 80cal oer gram.

    asked on April 26, 2007
  50. Biology

    i need to understand how draw a kite diagram. Any good websites would be helpful Thank you for using the Jiskha Homework Help Forum. Hopefully, you mean the botanical chart:

    asked on March 12, 2007
  51. Science/maths

    describe how you could make the following measurements and discuss any problems you might encounter a) finding the volume of a rugby ball b) finding the diameter of tennis ball. c) findin the mass of a grain of sugar a) submerge it in water in a graduated

    asked on March 3, 2007
  52. english essay

    Thanx alot again. Writeacher, Jenna, jk1115, for all your help thank you so much. Introduction: Topic: male/female communication Comparison of two articles (state article names) state thesis... i need help on this... What are the titles of the two

    asked on February 25, 2007
  1. Biology

    There are quite a few. The four most common are: cephalosporins, macrolides, quinolones, and penicillins. However, many of these are cloned and expressed in bacterial hosts.

    posted on February 9, 2016
  2. Science

    light from the sun isn't actually considered matter. It would be leaves.

    posted on December 3, 2015
  3. Science

    This is actually hurting the dog so its not commensalism.

    posted on December 2, 2015
  4. biology

    actually all of those disciplines do have some foundation in biology but that doesn't change my initial answer.

    posted on December 2, 2015
  5. biology

    Only two of those answers have a foundation in biology and its not B. I would probably say A.

    posted on December 2, 2015
  6. Biology

    A few ways, but usually as a glucose polymer stored within a vacuole of some sort.

    posted on November 17, 2015
  7. Accounting

    tender price ~ 59.22/sq.m

    posted on November 11, 2015
  8. biology

    The last one.

    posted on November 9, 2015
  9. Biology

    Plasma membrane, perhaps. It is semi-permeable not permeable. They are essential for all living cells which includes prokaryotic and eukaryotic organisms. Selectivity due to receptors and other proteins does allow for homeostasis.

    posted on October 26, 2015
  10. Biology

    It would probably be a chloroplast, although they're not only found in plants. Light-dependent reactions take place within these organelles. Although, green is reflected away so it wouldn't be the favorite color, it would be red or blue, depending on the

    posted on October 26, 2015
  11. science

    There's missing information.

    posted on October 26, 2015
  12. biology

    doesn't*. Sorry about that.

    posted on September 13, 2015
  13. biology

    A community simply describes the different population of organisms within a geographic range, it does include any physical characteristics, that's an ecosystem. Think about the organisms you listed and whether you think they could be found together.

    posted on September 13, 2015
  14. Algebra

    A low ha

    posted on August 31, 2015
  15. Math

    Supplementary angles have a combined sum of 180 degrees. You have one value given, so......

    posted on August 20, 2015
  16. College Algebra

    That's right. Did it mark it wrong because you forgot to add the base? Or a different input format?

    posted on July 31, 2015
  17. science

    It's B

    posted on July 27, 2015
  18. math

    What's the amount for the last one?

    posted on June 15, 2015
  19. Trigonometry

    50/(tan(41)) = x

    posted on June 1, 2015
  20. Math

    y=mx+b with M being your slope. What do you think the answer is?

    posted on May 30, 2015
  21. MAth

    Am I dead, perhaps

    posted on May 29, 2015
  22. Help somone!! (Technical Diffculties with Jiskha)

    are you trying to post links?

    posted on May 29, 2015
  23. science (cladogram)

    Without getting into much detail he would compare their genome and look for similarities that might indicate that they are closely related and perhaps belong on the same lineage or not.

    posted on May 28, 2015
  24. geometry

    P=2(L+w) 28=2(2.5w+w) 28/2=3.5w 14/3.5=w w=4 I found the width for you now use that information to find the length. I also gave the formula for the perimeter of a rectangle.

    posted on May 28, 2015
  25. math

    (12+18+16+17+X)/5=16 solve for x

    posted on May 28, 2015
  26. math

    Where's the data?

    posted on May 28, 2015
  27. Reading

    What's the question?

    posted on May 28, 2015
  28. PHYSICS

    F=kx F: refers to the force applied to the spring K: the spring constant of your particular spring. X: the distance stretched Find the spring constant from the first statement of your question and use that to find the distance stretched by the 100N force.

    posted on May 28, 2015
  29. Science

    They would form an ionic bond

    posted on May 27, 2015
  30. Algebra

    Is there more to this? If not then: X^15*Y^5

    posted on May 25, 2015
  31. 7th grade math

    For the 3rd should be: =7x + 5 - 3y + 3x + 5 - 4y =10x -7y + 10

    posted on December 17, 2014
  32. Economics

    So b?

    posted on December 15, 2014
  33. Economics

    Thank you

    posted on December 15, 2014
  34. Biology

    G1 checkpoint mechanism ensures that the cell is ready for cell division

    posted on December 14, 2014
  35. Chemistry

    Transition metals exist in many oxidation states.

    posted on December 14, 2014
  36. Biology

    yes

    posted on December 14, 2014
  37. Biology

    1. wrong, eye cells are somatic, while egg cells are not. 2. correct. 3. wrong. 78 homologous pairs would equal 156 total chromosomes.

    posted on December 14, 2014
  38. physics

    2) KE=1/2*m*v^2 sorry about that.

    posted on December 14, 2014
  39. physics

    1) KE=1/2*m*v^2 (KE*2)/v^2=m 2) KE=m*v^2 use the mass we found and convert mph to m/s

    posted on December 14, 2014
  40. Biology

    correct

    posted on December 14, 2014
  41. chemistry

    well if the system loses heat E, delta H is - , if the system requires an input of energy delta H is +

    posted on December 9, 2014
  42. physics

    what are you asking for?

    posted on December 9, 2014
  43. math

    before you actually apply these equations you need to know the equivalences between the two units being analyzed

    posted on December 9, 2014
  44. math

    oops y lbs * (x kg/ y lbs) = x kg

    posted on December 9, 2014
  45. Math

    i don't know how you got 105. it should be 90. so, -10x=90 divide by -10

    posted on December 9, 2014
  46. math

    x kg * (y lbs/ x kgs) = y lbs

    posted on December 9, 2014
  47. algebra

    $5=F $2=T F+T=500 5F+2T=$1450 solve for either variable on either equation and plug into equation you did not use. the rest should pretty straightforward from there

    posted on December 9, 2014
  48. science

    e=mc^2 solve for m

    posted on December 4, 2014