Feather

Most popular questions and responses by Feather
  1. calc 1

    If a ball is thrown in the air with a velocity 46 ft/s, its height in feet t seconds later is given by y = 46t − 16t2. (a) Find the average velocity for the time period beginning when t = 2 and lasting 0.5 second 0.1second 0.05 second 0.01 second i tried

    asked on January 23, 2016
  2. Chem

    The heat of vaporization of ammonia is 23.4 kj/moles. How much heat is required to vaporize 1.00kg of ammonia? How many grams of water at 0 degree celcius could be frozen to ice at 0 degree celcius by evaporation of this Amount of ammonia? I got the kj by

    asked on May 23, 2015
  3. calc 1

    If a ball is thrown in the air with a velocity 50 ft/s, its height in feet t seconds later is given by y = 50t − 16t^2. (a) Find the average velocity for the time period beginning when t = 2 and lasting 0.5 second 0.1 second 0.05 second 0.01 second i

    asked on January 27, 2016
  4. Chem

    Formal charges on CH2O and H2SO3 I was taught thus way valence electrons subtracted from addition of dots plus bonds For CH2O Carbon 4-(0+3) = + 1 . Oxygen 6-(4+1) = - 1 For H2SO3 I am having issues figuring out the dots and bonds

    asked on November 19, 2014
  5. calc 1

    For the limit lim x → 2 (x3 − 5x + 3) = 1 illustrate the definition by finding the largest possible values of δ that correspond to ε = 0.2 and ε = 0.1. (Round your answers to four decimal places.) i set it up like this 1-0.2

    asked on February 4, 2016
  6. Calc 1

    The point (1,0) lies on the curve y=sin(10π/x). A) if Q is the point (x,sin(10π/x), find the slope of the secant line PQ. Points are 2,1.5,1.4,1.3,1.2,1.1,0.5,0.6,0.7,0.8,0.9 Do slopes appear to be approaching a limit? There is no 10π/x on the unit

    asked on January 23, 2016
  7. Math

    Brian was training to run a marathon. During the three day period before the race he decided he would train for 11 hours. If he trained for 2 3/5 hours first day and 2 9/10 second day, how many hours would he need to train third day. This is the question I

    asked on December 14, 2016
  8. calculus 1

    The point P(2,-1) lies on the curve y=1/(1-x) If Q is the point (x, 1/(1-x) find slope of secant line. these are the points 2, -1 1.5,2 1.9,1.111111 1.99,1.010101 1.999,001001 2.5,0.666667 2.1,0.909091 2.01,0.990099 2.001,0.999001 using the results from

    asked on January 16, 2016
  9. Chem

    In some solid calcium carbonate samples, calcium bicarbonate Ca(HCO3)2. Write a balanced equation for its reaction with hydrochloric acid. CaCO3 + HCL= Ca^2+ (aq) + HCL + Ca(HCO3)2 I don't know if I have written the reactions and products correctly?

    asked on October 15, 2014
  10. calc 1

    f(t)=cos(πt/4) finding velocity i got -π/4sin(πt/4) then i had to find velocity after 3 sec which is v'(3)=-π/4sin(π(3)/4) = -π/4sin(π√2/2) (-π) (π√2)/4 x 2 = -1/8√2 ft/s i now have to find when the particle is at rest? how would you do this

    asked on February 22, 2016
  11. Chemistry

    Use half-cells to balance the following redox reaction, and label the oxidation and reduction half-reactions. Also, note that bromide is a spectator ion and can be eliminated. FeBr(aq) +Mg(s) = Fe(s) + MgBr2(aq) Fe^+2 -2e +Br^- e+ + Mg^+2 -2e =Fe^+2 -2e

    asked on September 28, 2014
  12. stats

    find area of indicated region under the standard normal curve the numbers are -.45 and 2.11 its shaded more towards the right i got the answer .3438 why is it not 1-normalcdf (-.45, 2.11, 0, 1) and why is it just normalcdf(-.45,2.11,0,1)

    asked on February 22, 2019
  13. Chem

    CaCO3 + 2H3O= Ca + 3H2O + CO2 How many moles of CaCO3 produced the moles of CO2 in the reaction?

    asked on October 15, 2014
  14. calc 1

    A boat is pulled into a dock by a rope attached to the bow of the boat and passing through a pulley on the dock that is 1 m higher than the bow of the boat. If the rope is pulled in at a rate of 1 m/s, how fast is the boat approaching the dock when it is 4

    asked on March 6, 2016
  15. Chemistry

    Use solubility rules to write the balanced molecular, complete ionic, and net ionic equations for the aqueous reaction between BaI2 and Hg(NO3)2. Include phase subscripts on all substances. I got to the part where you switch the elements Ba(NO3)2 +HgI2 I

    asked on September 25, 2014
  16. calculus 1

    lim x---> 2 4x+1/3x-4 illustrate definition 2 by finding values of delta that correspond to epsilon=0.5 and epsilon= 0.1 I having trouble setting this up. do i set up two different functions then divide? 0.2898 that's the answer i got....

    asked on February 3, 2016
  17. Chemistry

    For the reaction 2H2 + 1O2 à 2H2O, there are 8.08 grams of H2 available. 2. Use the ratio of stoichiometric coefficients in the reaction above to determine how many moles of H2O can be produced from the H2 available. Then, use molar mass to convert the

    asked on September 13, 2014
  18. Chem

    Define isoelectronic series. Put the K+, Ca2+, Cl-, and Ar ions and atoms in order of increasing size and explain the trends. Count the number of electrons for each atom Then, explain the (column) size trend for Mg2+ versus Ca2+ ions Is the order cl k ca

    asked on November 22, 2014
  19. Chem

    Suppose that the 10.0 g of NH3 is formed in a bomb calorimeter, and that all of the evolved heat for the exothermic reaction is completely absorbed by the surrounding 1000 g of water. Find the change in temperature (ΔT), and the final temperature (TF) of

    asked on October 20, 2014
  20. Chem

    Determining oxidation numbers for remaining atoms in HIO3, H3PO4, Ba(OH)2, and BaPO4 I have no idea if I am doing this right I don't even know how to do this For HIO3 I added the charges as +1 and 3(-2) which i got -5 then I did it the similar way for the

    asked on December 7, 2014
  21. Chem

    Review example 5.10 and exercise 5.10. Suppose 1.58 moles of N2 and 0.420 moles of O2 occupy 22.41 L at a total pressure of 2.00 atm. Use XA = to determine the (decimal) mole fractions of both components. Then, use XA = to determine the partial pressures

    asked on October 11, 2014
  22. Chem

    3Review example 5.7 and exercise 5.7. Suppose there are 2.00 moles of O2 at 1520 mmHg and 27.0 oC. Rearrange the ideal gas law and use it to determine the volume (L) of the gas. Then, find the density by rearranging the equation P(Mm) = dRT. Show all

    asked on October 11, 2014
  23. Chem

    Use half-cells to balance the following redox reaction, and label the oxidation and reduction half-reactions. Also, note that bromide is a spectator ion and can be eliminated. FeBr3(aq) +Mg(s) = Fe(s) + MgBr2(aq) Fe^+2 -2e +Br^- e+ + Mg^+2 -2e =Fe^+2 -2e

    asked on September 28, 2014
  24. chemistry

    3. Use the ratio of stoichiometric coefficients in the reaction above to determine how many moles of O2 will react with the H2 available. Then, use molar mass to convert the moles of O2 into grams. For the reaction 2H2 + 1O2 =2H2O, there are 8.08 grams of

    asked on September 13, 2014
  25. Chem

    Convert the final pressure for problem #1 into mmHg, Pa (kg/m∙s2), and kPa. Also, use 1 atm = 14.696 psi to convert to psi (pounds per square inch). Refer to conversion factors in the chapter 5 notes. Show all units and conversion factors. Final pressure

    asked on October 6, 2014
  26. Chem

    Determine the heat evolved (in kJ and in J) when 10.0 g of NH3(g) are created. Show all units and conversion factors. 10.0 gNH3 (1 mole nh3/17.0 g nh3)(-46.11 kj/1 mol nh3) = 23.11 kj -27.12 kj (1000j/1kj) -27,120 Is this correct?

    asked on October 20, 2014
  27. Chem

    1N2(g) reacts with H2(g) to form NH3(g), gaseous ammonia. Show balanced thermochemical equations based on both one mole and two moles of NH3(g). Determine Ho ( for both reactions using Table 6.2 (Hof). Use the summation equations. Show your

    asked on October 20, 2014
  28. human nutrition/math

    A particular food contains 7.8g of total fat, which is 12% of the RDA. Based on this, what is the RDA for total fat in a 2000 kcalorie diet

    asked on September 8, 2017
  29. human nutrition/math

    You eat 25 Doritos in a single sitting. One serving, which is approximately 11 chips, contains 140 kcalories. How many calories have you eaten?

    asked on September 8, 2017
  30. calc 1

    lim x---> 2 4x+1/3x-4 illustrate definition 2 by finding values of delta that correspond to epsilon=0.5 and epsilon= 0.1 I having trouble setting this up. do i set up two different functions then divide? 0.2898 that's the answer i got....

    asked on February 2, 2016
  31. Chem

    Determine all possible values of each quantum number (n, l, ml, and ms) for electrons in both the 2s and 2p subshells. for 2s the the quantum number would be -1/2,0,1/2 right?

    asked on November 2, 2014
  32. Chem

    An e−1 is released by an electron microscope at 3.00 × 106 m/s. Determine  in meters using the de Broglie relation Substitute kgˑm2/s2 for J and show all units. Then, convert  to pm and show the conversion factor. Determine the kinetic energy

    asked on November 1, 2014
  33. Calc 1

    Evaluate the limit (6+h)^3-216/h I think you would have expand the numerator (6+h)^3 = but how would you do it? 216+108h+h^3? It's not coming out right...

    asked on January 27, 2016
  34. calculus 1

    The point P(2,-1) lies on the curve y=1/(1-x) If Q is the point (x, 1/(1-x) find slope of secant line. these are the points 1.5 1.9 1.99 1.999 2.5 2.1 2.01 2.01 2.001 when i calculated it i got a negative number 1/(1-1.5)=-2 but the answer is 2. also would

    asked on January 14, 2016
  35. Chem

    Determine the total possible number of orbitals and electrons for both 2s and 2p. What is the maximum number of electrons per orbital? How are their spins related? In this question i don't get how the spins are related?

    asked on November 2, 2014
  36. Chem

    I am still having problems this question 2. Review Examples 7.3 and 7.4, as well as the equation for E in the chapter notes. Suppose an e−1 in an H atom has a transition from n = 3 to n = 2. a. Determine the energy (E) of the released photon. b.

    asked on November 1, 2014
  37. Chemistry

    If 64.0 g of H2O are actually obtained, find the actual yield %. Show that the % the same whether you calculate using grams or moles. Theoretical yield is 4.04 moles and in grams is 72.80 grams 2H2 + 1O2=2H2O

    asked on September 14, 2014
  38. Chemistry

    4. Suppose there are 72.0 g of O2 available, along with the 8.08 grams of H2. Use ratios of stoichiometric coefficients to find the limiting reagent for the reaction. Then, find the theoretical yield in both moles and grams. 2H2 + 1O2 à 2H2O I got 2.25

    asked on September 13, 2014
  39. Calc 1

    Differeniate V^3-2v√v/v I used the quotient rule (v)(v^3-2v√v)' -(v^3-2v√v)(v)' /(v) The answer is 2v-1-1 I got this far but then I don't know what to do further 2v^3-2v^1/2+2v√v/(v)^2

    asked on February 12, 2016
  40. Calc 1

    Differeniate V^3-2v√v I used the quotient rule (v)(v^3-2v√v)' -(v^3-2v√v)(v) /(v)' The answer is 2v-1-1 I got this far but then I don't know what to do further 2v^3-2v^1/2+2v√v/(v)^2

    asked on February 11, 2016
  41. calc 1

    lim t--->0 square rooted (1+t) - square rooted (1-t)/t this is what i have so far is the conjugates of the square root of 1+t and 1-t which would be square root of 1+t + square root of 1-t/t(square rooted (1+t)(1-t) the numerator is not canceling

    asked on January 29, 2016
  42. Calc 1 limits

    The equation is x^2+6x+9/x^4-81 Limit is x➡️-3 I factored it out and I got 1/36 would that be right The numerator would factor out to be (x+3)(x+3) then the denominator would be (x+3)(x-3)(x+3)(x-3) this would cancel out the (x+3) which would leave

    asked on January 27, 2016
  43. chem

    Suppose an e- in an H atom has a transition from n = 3 to n = 2. a. Determine the energy of the released photon. i set it up like this Ei=-Rh/3^2 Ef=-Rh/2^2 (-Rh/9)-(-rh/4)=-4rh+9rh/36=/-rh+4rh/9/- this part why does it go to -rh+4rh? But then I got the

    asked on October 25, 2014
  44. Chem

    For a photon with  = 730 nm, determine its speed, frequency, energy, and color. For frequency the formula would be v=c/lambda 3.00x10^8/7.30x10^-7=2.19x10^14/s Speed c=(v)(lambda) C=(v)(lambda) C= (2.19x10^14/s)(1.37x10^-6)=3.00x10^8 I got the

    asked on October 25, 2014
  45. Chem

    Then, determine the final volume needed to dilute 20.0 ml of 1.00 M NaOH to 0.25 M. Next, find the volume of water which needs to be added. Finally, determine the moles and the mass in grams of NaOH in the solutions. Final volume formula is Vf= mi/mf 20

    asked on September 28, 2014
  46. calc 1

    If h(x) = the square root of 4 + 3f(x) where f(2) = 4 and f '(2) = 2, find h'(2). i got the derivative as 1/2(4+3f(x))^-1/2 then i solved for the inside which is (0+3(8)) then multiplied the the two eating and i got 3.... but answer is wrong =(

    asked on February 18, 2016
  47. Calc 1

    G(X) = x^2(1-2x) I have to differentiate this function I used the power and product rule G'(X)= (x^2)'(1-2x)+(x^2)(1-2x)' I got down to 2x-4x+(x^2)(-2x) 2x-6x^2 which is the answer but what do info with the extra x^2?

    asked on February 10, 2016
  48. calc 1

    find the equation of the tangent line at the given point y=4x-3x^2 ;(2,-4) y-(-4)=m(x-2) what to do from here??? or is like this 3x(4x-1)^1

    asked on February 4, 2016
  49. Calc 1 limits

    Lim h-----> 0. (X+h)^3-x^3/h So I foiled out the numerator And I got X^3 +x^2h +2x^2h +2xh^2+h^2+h^3-x^3 So I canceled out x^3 and -x^3 Then I took out the h from the numerator to cancel out the h in the denominator and then I put in the zeros for h but I

    asked on January 30, 2016
  50. Calc 1 limits

    it is written as 1 in the numerator then in the denominator it is written as t√1+t this is then subtracted by 1/t lim is t----> 0 How would you factor this? Would it be by the conjugate?

    asked on January 29, 2016
  51. Calc 1

    √1+t-√1-t/t lim -----> 0 The answer is one and I am not getting it I factored it like this √1+t-√1-t/t x √1+t-√1-t Factoring it out further I got in the numerator (1-t)(1+t) / t(√1+t+√1-t) how do you cancel further?

    asked on January 29, 2016
  52. Limits calc 1

    (1/t√1+t - 1 /t) lim t➡️0 So far I factored out 1/t√1+t - 1/t x √1+t/√1+t I am having trouble going further

    asked on January 29, 2016
  53. Limits calc 1

    Lim X➡️-2. X+2/x^3+8 How do I factor out the bottom? The answer is 1/12 Would it be like this x+2/(x+2)(x-2)(x+2)??

    asked on January 29, 2016
  54. Limits calc 1

    X^2 +6x+9/x^4-81 I put the answer as 1/36 it's not the answer?? It told me to use the identity x^4-a^4=(x+a)(x-a)(x^2+a^2) I used it, u still get the same answer....

    asked on January 27, 2016
  55. College pre calc

    Use bionomial formula to find the coefficient of the t^2 m^8 term in the expansion of (3t+m)^10. I got so far this 10C8 x 3^2 x t^2 x m^8 It tell me the next step is here =45 x 9 x t^2 x m^8 where did the 45 come from?? It doesn't explain that to me! The

    asked on November 20, 2015
  56. Math algebra

    Graph g(x)= 2x+8 if x

    asked on September 9, 2015
  57. Chem

    What are the relative masses of protons neutrons and electrons?

    asked on December 5, 2014
  58. Chem

    O=S=O what is this molecular structure Sulfur dioxide? It wants it's binary compound name and formula it is written this way SO2?

    asked on December 5, 2014
  59. Chem

    Define electron affinity, and explain why Na has a less exothermic value than Cl in terms of ion stability (Na-1) I know the definition part is Na less esothermic because Na has more energy? But why?

    asked on November 12, 2014
  60. Chem

    Define IE, and explain why Na has a smaller value than Cl in terms of ion stability (Na+1 versus Cl+1). Would it be Na? But I can't explain why?

    asked on November 12, 2014
  61. Chem

    For two spin-paired electrons that are in the same orbital, describe how the values for the first three quantum numbers (n, L, and mL) are related for the two electrons. Is this because no other electron has the same quantum number?

    asked on November 11, 2014
  62. Chem

    Find the constants (a and b) for O2 in Table 5.7. Use the Van der Waals equation to determine the pressure of 1.000 mole of O2 if the gas occupies 22.50 liters at 27.00 oC. First, find the values for each of the two terms in the equation, then find the

    asked on October 11, 2014
  63. Chem

    Then, determine the final volume needed to dilute 20.0 ml of 1.00 M NaOH to 0.25 M. Next, find the volume of water which needs to be added. Finally, determine the moles and the mass in grams of NaOH in the solutions. Do I take 60 ml and convert it to moles

    asked on September 28, 2014
  1. social studies

    B silk road

    posted on February 23, 2019
  2. Language Arts

    i took this assessment for connexus, too. here are the correct answers if you need them! 1 - B 1.5 - C 2 - A 2.5 - C 3 - D 4 - C 5 - D 6 - B 7 - A 8 - B 9 - A 9.5 - D 10 - C 11 - A 12 - D 13 - A 14 - A 15 - A 15.5 - D i can guarantee you will get a 100% :)

    posted on May 18, 2018
  3. math

    well anonymus if ur not a cheater than how did u find the website and question hmm?

    posted on March 29, 2016
  4. calc 1

    the answer is 0, 4, and 8 how do i get that from the equation?

    posted on February 23, 2016
  5. calc 1

    right

    posted on February 23, 2016
  6. Calc 1

    Idon't why my phone didn't put the end part the problem is v^3-2v√v/v

    posted on February 12, 2016
  7. Calc 1

    Idon't why my phone didn't put the end part the problem is v^3-2v√v/v

    posted on February 12, 2016
  8. Limits calc 1

    yes that is what it is!! sorry for the confusion

    posted on January 29, 2016
  9. Calc 1

    yes i will now

    posted on January 29, 2016
  10. Limits calc 1

    No its written as 1 in the numerator then in the denominator it is written as t√1+t this is then subtracted by 1/t lim is t----> 0 How would you factor this?

    posted on January 29, 2016
  11. Calc 1 limits

    X^2 +6x+9/x^4-81 I put the answer as 1/36 it's not the answer?? It told me to use the identity x^4-a^4=(x+a)(x-a)(x^2+a^2) I used it u still get the same answer....

    posted on January 27, 2016
  12. Calc 1

    No the answer is 1.7321 if x = 2 then y is 1.7321 that is the answer in the back

    posted on January 23, 2016
  13. calculus 1

    it says to round to 6 decimal numbers so it would for example the first point (1.5, 2) then it would be (1.9,1.111111) right?

    posted on January 14, 2016
  14. College pre calc

    What are the 8! Stand for? How did you get 2?

    posted on November 20, 2015
  15. Math algebra

    Thanks Steve!

    posted on September 10, 2015
  16. Chem

    60ml(0.25/.06) 0.150 mols how would I get grams

    posted on September 28, 2014
  17. Chem

    Do I use the 60 ml to convert to mols and grams ?

    posted on September 28, 2014
  18. Chemistry

    Use half-cells to balance the following redox reaction, and label the oxidation and reduction half-reactions. Also, note that bromide is a spectator ion and can be eliminated. FeBr3(aq) + Mg(s) à Fe(s) + MgBr2(aq)

    posted on September 28, 2014
  19. Chemistry

    How come O2 is the limiting reagent ? If o2 is 2.25 and h2 is 4.04

    posted on September 14, 2014
  20. Chemistry

    hello just for the heck of it could you show me your way to do the limiting regent problem? this if for DRBOB

    posted on September 14, 2014
  21. chemistry

    2. Use the ratio of stoichiometric coefficients in the reaction above to determine how many moles of H2O can be produced from the H2 available. Then, use molar mass to convert the moles of H2O into grams. For the reaction 2H2 + 1O2 à 2H2O, there are 8.08

    posted on September 13, 2014