selina

Most popular questions and responses by selina
  1. Chemistry

    2 NaOH + CuSO4  Na2SO4 + Cu(OH)2 100g of Cu(OH)2 is needed. Assuming 100% yield, how much of 1M NaOH and 0.5M CuSO4 must be used in mL?

    asked on March 16, 2014
  2. math

    in an arithmetic sequence whose first term is 4, the 1st, 3rd and 7th terms form consecutive terms of geometric sequence, find the sum of the first three terms of the arithmetic sequence

    asked on December 20, 2015
  3. Chemistry

    2) Given the balanced reaction equation predict the moles of each product given the following reactants: AlCl3 + 3 NaHCO3 Al(OH)3 + 3 NaCl + 3 CO2 AlCl3 NaHCO3 Al(OH)3 NaCl 58.4 CO2 a 1 mol 1 mol ? ? b 1 mol 3 mol ? ? c 3 mol 1 mol ? ?

    asked on March 16, 2014
  4. algebra

    Suppose that $4000 is invested at an interest rate of 5.5% per year, compounded continuously. What is the balance after 8 years?

    asked on May 9, 2010
  5. English

    I have a homework where I have to write about on this topic which says mythical character I admire and I don't have a clue on how to start Please help

    asked on May 29, 2018
  6. perimeter

    how to draw a 15 cm and 9 cm perimeter

    asked on November 14, 2010
  7. Veterinary Medicine Math calculations

    I was so thankful to see this exact question answered in a different way but I still don't understand how I'm suppose to know how or what to do on the following question. I just seem to always forget something. Fifty milliliters of a solution of 50%

    asked on February 6, 2017
  8. Chemistry 151

    5) How many mL of 1M HCl is used to make the following dilutions? a) 100mL of 0.1M HCl = b) 250mL of 0.5M HCl= c) 10ml of 0.01M HCl= 36.64 is the molar mass of hcl do I divide that into ml?

    asked on March 16, 2014
  9. Physics

    A 2.2-kg baseball is pitched to you at 21 m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.17 s, what is the magnitude of the average force the bat exerted on the ball? Please show all

    asked on July 7, 2013
  10. Math

    Mrs. Collin has 140 apples. She uses 2/5 of them to bake a pie and 1/4 of them to make jam. How many apples does she have left?

    asked on February 18, 2016
  11. physics

    A particle moving with uniform acceleration in a straight line was first observed to be moving at 4.5 m/s. After 10 sec, it was moving at 6.8 m/s. What is its acceleration?

    asked on October 8, 2011
  12. physics

    Three capacitors are connected to a battery of unknown voltage as shown in the circuit diagram above. The voltage drop across capacitor C 1 is V 1 = 11 . volts. a) What is the effective capacitance of the three capacitors? c) What is the voltage of the

    asked on February 17, 2016
  13. science

    i need help with a reason for the season science lab of how earth orbits sun

    asked on February 8, 2015
  14. algebra

    students in a biology class just took a final exam. a formula for predicting the average exam grade on a similar test t months later is. s(t)=78-15log(t+1) (a)find the students average score when they first took the final exam. (b)what would be the

    asked on May 11, 2010
  15. Math

    Aaron has 120 sports cards. 3/8 of them are football cards and the rest are baseball cards. how many baseball cards does he have?

    asked on February 18, 2016
  16. physics

    parallel plate capacitor has an area of 5cm^2 and a capacitance of 3.5PF. the capacitor is connected to a 12v battery .after the capacitor is completely charge up the battery is removed. a)what must be the separation of the plates and the charge density on

    asked on February 15, 2016
  17. Ethics ADJ/235

    CheckPoint: Interpretation of Ethical Systems Review the scenario in Situation 1 on p. 50 of the text.Write a 200- to 350-word paper in which you explain how you would respond to the scenario. Address these ethical systems in relation to the scenario:

    asked on October 15, 2009
  18. Chemistry

    I need to balance the equation of the reactants NaHCO3->CuCl2 please help me.

    asked on March 23, 2014
  19. Math

    Bailey has $105. She spends 3/7 on a new jacket and 1/5 on a new sweater. How much money does she have left?

    asked on February 18, 2016
  20. geography

    what is exsolation?

    asked on March 6, 2016
  21. social studies

    during which twenty year period did the native american population of central mexico fall by around four million?

    asked on September 18, 2008
  22. Math

    The tornadoes have won 75% of their games. If they their next 4 games, their win percentage goes up to 80%. How many games have they played right now? (Please explain how to solve this problem)

    asked on July 20, 2016
  23. chemistry

    hey drbob222, where did u get 500ml from? question is: 1.00 mL of a 0.0500 M sucrose solution is transferred to a 100 mL volumetric flask, and the flask brought up to volume. 5.00 mL are taken from the 100 mL volumetric flask and transferred to a 0.500 L

    asked on October 14, 2011
  24. chem

    1.00 mL of a 0.0500 M sucrose solution is transferred to a 100 mL volumetric flask, and the flask brought up to volume. 5.00 mL are taken from the 100 mL volumetric flask and transferred to a 0.500 L flask, and it is brought up to volume. What is the

    asked on October 10, 2011
  25. math

    how manyyards are in a mile? 1760 I think There are 5,280 feet in a mile. There are 3 feet in a yard. 1 mi x (5,280 ft/1 mi) x (1 yd/3 ft) = ?? Note that the first factor cancels miles and changes miles to feet, the second factor cancels feet and converts

    asked on October 22, 2006
  26. Chemistry

    I need to determine the "percentage composition unknown" whatever that is. My current data: a) mass of test tube and foil cover: 7.5323 g b)temp of water bath: 375.65 K c) mass of test tube and foil and gas as sample: 7.5423 g d) barometric pressure:

    asked on November 4, 2010
  27. chemistry

    How do I work out the density of HCI at 600 celsius ? Thanks

    asked on March 2, 2010
  28. Math

    There are 5 rows - there are 4 items in each row - there are NO more than 10 items Any idea how this can be solved? Draw a 5 pointed star connecting all the vertices. Place one item at each vertex and one item at the intersection of the lines joining the

    asked on August 24, 2005
  29. physics

    determine the a)charge on the capacitor b)voltage across the capacitor c)current through the resistor after t=rc when a capacitor is getting charged interms of their peak values

    asked on February 17, 2016
  30. please help physics

    parallel plate capacitor has an area of 5cm^2 and a capacitance of 3.5PF. the capacitor is connected to a 12v battery .after the capacitor is completely charge up the battery is removed. a)what must be the separation of the plates and the charge density on

    asked on February 15, 2016
  31. math

    find the equation of tangent line to the graph of f(x)=xcosx(√2 x) at a=0

    asked on December 27, 2015
  32. Direct way to improve yield of ball mill

    The Ball Mill as a general grinding equipment, is widely used in dressing, building materials and chemical industry, ball mill can be divided into dry and wet type two kinds of grinding way. According to the row of ore in different ways, and can be divided

    asked on June 13, 2013
  33. The defects of ball mill

    The Ball Mill faults: (1) work efficiency is low, the power consumption unit. (2) the ball mill barrel rotational speed is low (about 15 ~ 27 r/min), if you use ordinary motor that. The average all need equipped with expensive reducer. (3) grinding medium

    asked on June 13, 2013
  34. Life orientation

    Identify and describe three environmental health hazards that cause ill health ,crises ,and globally .include evidence that is current of the identified issues .use graph s,statistics,pictures etc to show evidence of your information.

    asked on April 27, 2013
  35. Math

    Mr. Cole has $200. He keeps 3/4 of the money for himself and divides the rest equally between his two children. How much money does each child receive?

    asked on February 18, 2016
  36. math

    find the equation of tangent line to the graph of f(x)=xcos(√2 x) at a=0

    asked on December 27, 2015
  37. history

    The Conflict : The India-Pakistani Partition Answer the following questions about the conflict you chose: 1.Who is involved (what countries/regions)? * 2.What is the basis of the dispute? (If there are multiple disputes between these two parties, focus on

    asked on October 6, 2014
  38. Chemistry

    Find the molarity of 0.02g of silver nitrate dissolved in 1kg of water

    asked on March 16, 2014
  39. Life orientation

    Identify and describe three environmental health hazards that cause ill health ,crises ,and globally .include evidence that is current of the identified issues .use graph s,statistics,pictures etc to show evidence of your information.

    asked on April 27, 2013
  40. math

    {y-2}/(a^2-5a+6)=(a+1)/(a-3)-(a+2)/(a-2) How can I solve for y in terms of the other variables??? I tried many times, but I just get y=6,can't express y in terms of variables. Can anyone please correct me or teach me?THANKS A LOT!

    asked on February 14, 2008
  41. solcial studies

    what made Jamestown a bad settlement?

    asked on January 17, 2008
  42. Economics

    After the U.S. invasion of Iraq, the price of jet fuel used by airlines increased dramatically. As the CEO of Air Canada, you have been presented with the following options. Evaluate these options in the context of decision making model. a) raise airfares

    asked on January 14, 2007
  43. Math

    Only the 1, +, -, X, / , (, ), and = keys on a scientific calculator are working. How can a result of 75 be reached by pushing these keys less than 20 times? isn't five squared twenty-five, multiplied by three...

    asked on August 24, 2005
  44. physics

    consider an inductive circuit suppose we want the current amplitude in a radio receiver to be 250*10^-6 A when the voltage amplitude is 3.6V at a frequency of 1.6MHz. what inductance reactance is needed?what inductance is needed?

    asked on April 4, 2016
  45. math

    the second derivative of f(x)=ln(x^2+1)

    asked on December 27, 2015
  46. life orientation

    environmental health hazards that cause ill health,crises,and or disasters within your community or any other community within south africa and globally

    asked on April 24, 2013
  47. collage math

    f(x)=x^3+3x find the rate of change between the two stated values x:1 to 2

    asked on December 26, 2012
  48. minum distance

    Find the minimum distance from the point (3,0) to y=(x)^1/2

    asked on October 6, 2010
  49. math

    (-11) (1/8) find the product

    asked on February 27, 2008
  50. life science

    true or false? The temperature varies greatly throughout the year in a tropical rain forest.

    asked on February 8, 2012
  51. math

    what is 3/4 times 11/12? thnx!

    asked on April 2, 2009
  1. physics

    but for my previous question if a sheet of mylar is placed between the plates how will the voltage across the plate and the charge density on the plate change?

    posted on February 17, 2016
  2. physics

    oh okai

    posted on February 17, 2016
  3. physics

    if the mylar is removed and the plates are moved 1mm further from each other what will be the voltage across the plate and how much work will it take to move the plate apart

    posted on February 17, 2016
  4. math

    okay I get it and a is as you said just to say x

    posted on December 27, 2015
  5. math

    it will be y=x but how do we know it passes through (0,0)

    posted on December 27, 2015
  6. math

    yep thanks

    posted on December 27, 2015
  7. math

    can't we cancel them out

    posted on December 27, 2015
  8. math

    sorry the question is f(x)=xcos(√2 x) at a=0

    posted on December 27, 2015
  9. 4th grade

    1554

    posted on December 18, 2015
  10. history

    thank you :) is there any other sites that might be helpful?

    posted on October 6, 2014
  11. history

    yes please do you know any sites that would help me? i have been stuck on this for weeks

    posted on October 6, 2014
  12. Economics

    Suppose that you are a bicycle producer. In 2 or 3 sentences, explain why you are willing to supply the most bicycles at the highest price. You must use your imaganation to answer this in your own words.

    posted on September 15, 2014
  13. Chemistry

    Thank you very much for your time on this and the other problems I posted. You are appreciated. Selina Olomua

    posted on March 16, 2014
  14. 9th grade

    ABUOYANTGIRLANT

    posted on August 23, 2013
  15. Art

    The last one has all the right answers but 4 is c

    posted on January 30, 2013
  16. chem

    where did u get 500ml?

    posted on October 14, 2011
  17. geography

    very, very carefully. You probably shouldn't--for several reasons (which I will list) 1. You value your own sanity 2. You value your time 3. The constitution is a very long document, but to leave any part out would warp its meaning. The words are there for

    posted on November 4, 2010
  18. biology/poetry

    Plant life stretched up Hoping for sunlight Optimism failed Tall trees stealing the gold Overcast skies blocked the Sun, giver of life Yesterday--not a cloud in the sky Nightime, just quiet stars Terribly impatient for a new day Hot, warm, drenched in

    posted on November 4, 2010
  19. 7th grade

    just 754/9471. Nothing else you can do :)

    posted on November 4, 2010
  20. 8th grade

    As I do not know the context--perhaps she was faking an injury? It would be helpful to provide a source!

    posted on November 4, 2010
  21. Expository Essay Help

    John !@#$%^&ennedy was born in a family with a history of political and public service

    posted on October 27, 2010
  22. Algebra

    You would take your answers and plug them in to the equation. 4(-6^2)+4(-6)-120=0 and 4(5^2)+4(5)-120=0 then work out the problems and if you are correct 0=0 Hope this helped

    posted on May 12, 2010
  23. arithmetic

    Thank you for correcting me, my finger must have hit the 5 instead of the 2. The answer is #3.12 Thanks

    posted on May 11, 2010
  24. algebra

    I know the answers I just am not sure how to work the problem to get them. (a)78 (b)67.5 Please help me with the working of these problems. Thank you

    posted on May 11, 2010
  25. arithmetic

    when you are working with a percentage you move the decimal two spots to the left and then multiply the purchase by the percentage of tax in decimals. $48x0.065= $3.15 I hope this helps

    posted on May 11, 2010
  26. chemistry

    Thank you guys I will try both suggestions

    posted on March 2, 2010
  27. acids and alkalis

    Vinegar soap Handwash Mouth Wash baking soda cold tea Ammonia Bleach Washing Powder Oven cleaner

    posted on March 1, 2010
  28. English expression

    internet friends

    posted on February 27, 2008
  29. math

    however,6 is not a variable..the question is asking to solve for y in terms of other variables

    posted on February 14, 2008
  30. math

    that means that still equal to 6 right?

    posted on February 14, 2008