ABCD

Popular questions and responses by ABCD
  1. chemistry 101

    Consider the following reaction. CaO (s) + CO2 (g) = CaCO3 (s) A chemist allows 14.4 g of CaO and 13.8 g of CO2 to react. When the reaction is finished, the chemist collects 19.4 g of CaCO3. Determine the limiting reactant, theoretical yield, and percent

    asked on July 8, 2011
  2. chemistry 101

    How many grams of oxygen are in 40.1 g of calcium hydroxide? options: 17.3 g 8.64 g 20.1 g 0.541 g 11.2 g

    asked on July 8, 2011
  3. physics

    Ant climb up 5 stairs, each of length 20 cm and height 20 cm . Find the distance covered and displacement covered by ant ?

    asked on June 20, 2017
  4. Chemistry

    If methane burns with oxygen and form carbon dioxide and water,so why the carbon dioxide doesn't extinguish heat produced .

    asked on June 1, 2017
  5. chemistry 101

    How many moles of oxygen are in 3.45 mol of diphosphorus pentoxide? options: 5.75 mol O 13.5 mol O 6.90 mol O 3.45 mol O 17.3 mol O

    asked on July 8, 2011
  6. chemistry 101

    given the reaction: 2mg + o2-----> 2mgo . when 4.32g of oxygen react with magnesium 327kj of energy is produced. the heat of reaction for 1 mole of oxygen is???

    asked on July 9, 2011
  7. chemistry 101

    How many molecules of oxygen are produced from the decomposition of 8.75 g of hydrogen peroxide in the following equation Mg + H2O2 --> MgH2 + O2 options: 8.75 x 1024 6.02 x 1023 1.55 x 1022 5.27 x 1024 1.55 x 1023

    asked on July 8, 2011
  8. chemistry 101

    Lakes that have been acidified by acid rain can be neutralized by the addition of limestone (CaCO3). How much limestone in kilograms would be required to completely neutralize a 5.2 x 109 L lake containing 5.0 x 10-3 g of H2SO4 per liter?

    asked on July 8, 2011
  9. chemistry 101

    Determine the empirical and molecular formula for a compound made from 54.09% calcium, 2.72% hydrogen, and 43.18% oxygen with a total molar mass of 222.3 g.

    asked on July 8, 2011
  10. physics

    1) A particle moves in the xy plane (see the from the origin to a point having coordinates x = 7m and y = 5m under the influence of a force given by F= 3yi^2 - 5xj. a) What is the work done on the particle by the force F if it moves along path 1? (ABD) J

    asked on May 31, 2018
  11. chemistry 101

    Calculate the empirical formula for the following compound: potassium tartrate found in baking powder: 20.8% K, 2.7% H, 25.5% C, and 51.0% O

    asked on July 8, 2011
  12. chemistry

    Benzene, C6H6, is a known carcinogen that burns in air according to the following unbalanced equation: C6H6(l) + O2(g)  CO2(g) + H2O(g) a. What is the mole ratio of O2 to C6H6? b. How many moles of O2 are required to react with each mole of C6H6? c. How

    asked on July 3, 2011
  13. chemistry 101

    Given the following dissolving process: Fe2(SO4)3 (s) = 2Fe3+ (aq) + 3SO42- (aq) How many grams of iron (III) ions are produced when 0.450 moles of sulfate ion are produced? options: 50.3 g 16.8 g 50.3 g 37.7 g 75.4 g

    asked on July 8, 2011
  14. chemistry

    Predict whether reactions should occur between aqueous solutions of the following compounds. If so, write balanced molecular and net ionic equations for the reactions. Include physical states. a. (NH4)2CO3 and CrCl3 b. Ba(OH)2 and HCl c. FeCl3 and NaOH d.

    asked on July 3, 2011
  15. Physics

    Describe another real world example for each type of collision. Real World Elastic Collision: Real World Inelastic Collision:

    asked on February 28, 2018
  16. Thermodynamics

    Consider air as an ideal gas with Cp=1000 J/(kg.K), R=287 J/(kg.K) and γ≈1.4. It is compressed from 1 bar, 300K to 10 bar using a compressor. The compressor can be considered adiabatic but not reversible. The flow rate is 2 kg/s, and the entropy

    asked on November 22, 2016
  17. chemistry

    Suggest chemical reactions that could be used to identify the contents of four unlabeled bottles containing solutions of the following substances: CuSO4, Al2(SO4)3, Pb(NO3)2, and FeSO4.

    asked on July 3, 2011
  18. chemistry

    Consider the following equations. For each, decide whether it represents a chemical reaction or a physical change. a. SnCl4(aq) + 4H2O(l)  Sn(OH)4(s) + 4HCl(aq) b. 4K(s) + O2(g)  2K2O(s) c. NaCl(s)  Na+(aq) + Cl-(aq)

    asked on July 3, 2011
  19. math

    PQRS is a cyclic quadrilateral. Then find the value of x

    asked on February 4, 2017
  20. physics

    We know how to calculate the total resistance of the cylindrical conductor given its length, radius, and resistivity. But how do we calculate the equivalent resistance when the resistivity is not constant? For example, say the resistivity at a particular

    asked on March 11, 2013
  21. chemistry 101

    What is the coefficient for aluminum after the following equation is balanced: Al(s) + O2(g) --> Al2O3(s) options: 2 4 1 3 0

    asked on July 8, 2011
  22. Maths

    Points A,B,C are given on circle Γ such that AB=BC. The tangents at A and at B intersect again at point D. The line CD intersects Γ again at E. The line AE intersects BD at F. If AD=120, what is the length of FB.

    asked on May 29, 2013
  23. English - Shakespeare

    In "Othello" Desdemona is slapped by Othello in Act 4 Scene 1. Why soesn't she defend herself eventhough she's innocent? I was thinking that maybe she was just too stunned to do anything or maybe she thought that something was wrong such as he was ill or

    asked on January 7, 2009
  24. Thermodynamics

    Consider air as an ideal gas with Cp=1000 J/(kg.K), R=287 J/(kg.K) and γ≈1.4. It is compressed from 1 bar, 300K to 10 bar using a compressor. The compressor can be considered adiabatic but not reversible. The flow rate is 2 kg/s, and the entropy

    asked on November 22, 2016
  25. stats

    Assume it is known that the probability of birth is equal in all months. What is the probability that in the STAT 1025 class of 120 students, exactly 20 students have their birthdays in either August or September? Solve using (i) the exact Binomial

    asked on February 27, 2016
  26. math

    What factoring technique would be used to factor 2x^2+5x+3?

    asked on January 4, 2009
  27. math

    How would the maximum and minimum values of a feasible region be found with a given function such as f(x,y)=-x+3y?

    asked on December 30, 2008
  28. Maths

    Mariolys is creating a numbered list of distinct integers. Luigis sees that there are N numbers in the list, and states that he can find either a subsequence of length 13 with increasing terms or a subsequence of length 17 with decreasing terms. What is

    asked on May 29, 2013
  29. Maths

    Let S be a set of 31 equally spaced points on a circle centered at O, and consider a uniformly random pair of distinct points A and B (A,B∈S). The probability that the perpendicular bisectors of OA and OB intersect strictly inside the circle can be

    asked on May 29, 2013
  30. math

    Can anyone help, my calculator does not have enough space for simplifying this, sqrt[(16*10^113)/250*10^-28]

    asked on January 5, 2009
  31. math

    Last question. If I have found all of the linear equations and have all of the intersection points for this feasible region, how do I calculate the maximum and minimum using the given function f(x,y)=-x+3y?

    asked on December 30, 2008
  32. math

    Pertaining to the previous question, if two of the vertices of a feasible region are at (1,3) and (6,1) how would the linear equation representing a line connecting them be found?

    asked on December 30, 2008
  33. Physics

    In a relay race the second runner does not start from rest. it covers 100 m in 10 sec, finishing with maximum velocity of 12 m/sec, assuming the constant acceleration, determine his initial velocity. ??

    asked on April 2, 2014
  34. Maths

    Let A0=(−1,0), and let O be the origin (0,0). For each integer i≥1, we construct the point Ai so that |Ai−1Ai|=|Ai−1O| and the angle ∠OAi−1Ai is a right angle. If O,Ai−1,Ai+1 are not collinear for any value of i, what is the x-coordinate of

    asked on May 29, 2013
  35. Math/Geometry

    Two circles of radius r1 and r2 are extenally tangential to each other and are also externally tangential to a staight line l. Another circle of some unknown radius is externally tangential to both the circles and to the straight line l. Find the adius of

    asked on March 13, 2013
  36. math

    Are you sure that (2x+1)(x+3) is the factored version of 2x^2+5x+3?

    asked on January 4, 2009
  37. Maths

    Given the set of integers {1,2,3,…,801}, what is the maximum number of sets we could distribute these numbers into such that the sum of each set is exactly the same.

    asked on May 29, 2013
  38. Maths

    Find the denominator n of the rational number kn (k,n are both integers) such that ∣Root 2 - k/n∣ is the smallest possible, out of all rational numbers with denominator less than 1000?

    asked on May 29, 2013
  39. Maths

    Let x,y,z be non-negative real numbers satisfying the condition x+y+z=1. The maximum possible value of x^3y^3+y^3z^3+z^3x^3 has the form ab where a and b are positive, coprime integers. What is the value of a+b?

    asked on May 29, 2013
  40. Maths (Geometry)

    P is a point in rectangle ABCD. The distance from P to the 4 vertices of the rectangle are 7,15,24 and N in some order. If N is an integer, determine the value of N.

    asked on May 29, 2013
  41. math

    It's impossible to factor x^2-6x+5 right?

    asked on January 4, 2009
  42. Drama

    What are the techniques used in improv? I am assuming that you a refering to improvisational comedy rather than music or other areas. Since this is not my area of expertise, I searched Google under the key words "improv techniques" to get these possible

    asked on October 10, 2006
  43. math

    prove that tan(π/4+x/2)+tan(π/4-x/2)=2sec x

    asked on October 8, 2016
  44. Maths

    Find the number of pairs of non-negative integers (n,m), such that 1≤n

    asked on May 29, 2013
  45. Thermodynamics

    Consider 100 kg/s of steam expanding in a turbine. The inlet to the turbine is at 15 MPa, 500 degrees C. The steam expands to 0.01 MPa. The exit entropy is 6.200 kJ/(kg.K). Though the turbine is well insulated, at a place where the temperature is 127

    asked on November 22, 2016
  1. maths

    Thanks

    posted on September 27, 2019
  2. Physics

    Thank you SO MUCH DAMON

    posted on February 28, 2018
  3. Social Studies

    D because it's convenient method

    posted on June 1, 2017
  4. Math

    Yes because when we smaller them like 25/45 divide by 5 and 15/27 divide by 3 it forms 5/9

    posted on June 1, 2017
  5. Math

    We have this at the U of A too

    posted on February 23, 2017
  6. Physics

    Two wires A and B of the same material and having same length, have their cross sectional areas in the ratio 1:6. What would be the ratio of heat produced in these wires when same voltage is applied across each?

    posted on December 19, 2016
  7. Thermodynamics

    Consider 2 kg of an ideal gas (R=300 J/(kg.K) and Cp=1000 J/(kgK)) contained in a piston cylinder arrangement. The cylinder has a small valve at the end opposite to the piston.The cylinder walls are not adiabatic and allow heat transfer. The initial

    posted on November 22, 2016
  8. Thermodynamics

    plzzz give the answer onlyyyy

    posted on November 22, 2016
  9. Thermodynamics

    1.What is the entropy production rate (in kW/K)? 2.If the process is possible, what is the outlet dryness fraction? 3.if the process is possible, what is the power output of the turbine, in MW?

    posted on November 22, 2016
  10. alpha

    We know sec²ø-tan²ø=1 Therefore (secø+tanø)(secø-tanø)=1 From this we get secø-tanø=1/x,secø+tanø=x Subtract both equation 2secø=x+1/x Secø=1/2(x+1/x)

    posted on September 15, 2016
  11. Unknown

    Exactly one triangle exists with the given conditions, and it must be a scalene triangle.

    posted on April 16, 2016
  12. Cyber safety

    A 1&3 B

    posted on February 10, 2016
  13. math 3rd grade

    Sarah ordered a veggie pizza she ate 3 slices of the veggie pizza how many factions of the veggie pizza are left over

    posted on September 10, 2015
  14. Math

    Cara order a veggie pizza she she ate 3 slices of the veggie pizza how many factions of the pizza are left

    posted on September 10, 2015
  15. Physics

    any one Q2_2_5

    posted on July 28, 2013
  16. Physics

    That's easy. From the given conditions, height= length/2

    posted on March 19, 2013
  17. Geometry

    Yes, solving gives HI^2= 792.

    posted on March 7, 2013
  18. maths

    This problem is at an website (brilliant . org). Please don't answer this since the problem is open. Answer this the next week.

    posted on February 15, 2013
  19. chemistry 101

    so whts th answer from th options??

    posted on July 8, 2011
  20. English - Shakespeare

    Thanks

    posted on January 7, 2009
  21. math riddle

    A robber ducky

    posted on January 5, 2009
  22. math

    Thanks

    posted on January 5, 2009
  23. algebra

    Just add the two together as they are then divde the term with no variable by the one with a variable to get your answer.

    posted on January 5, 2009
  24. algebra

    y=5/3X-4

    posted on January 5, 2009
  25. math

    Ah, thank you. I was thinking that 5 had to be divided into squares but it is prime.

    posted on January 4, 2009
  26. math

    ok thanks

    posted on January 4, 2009
  27. math

    Sorry this was meant for Reiny

    posted on January 4, 2009
  28. math

    oh that's what you mean. I guess we call it something different. Thanks

    posted on January 4, 2009
  29. math

    nevermind

    posted on January 4, 2009
  30. math

    Not really

    posted on January 4, 2009
  31. religion and social studies

    I would have to say because religion has been an integral part of society since humans have lived. Social studies is studying society, people, customs, etc.

    posted on December 31, 2008
  32. jewerly marking

    I believe it is Continental silver. Yaahoo 82.5% silver and choose 3rd link

    posted on December 31, 2008
  33. math

    Thanks, I hope that's it.

    posted on December 31, 2008
  34. algebra

    Subtract 2cm from 16cm and then divide that number by 2. After that multiply it by 5.

    posted on December 30, 2008
  35. Biology

    1.Cytosol is the liquid found within a cell, so I would say D. BUT cytoplasm is actualy the cytosol + organelles. This would make D. and E. the same so I would say A. none of these. 2.Prokaryotic cells divide by binary fission. Although this is the way

    posted on December 30, 2008
  36. math

    Thanks, I appreciate the help.

    posted on December 30, 2008
  37. math

    Thanks

    posted on December 30, 2008