Questions Asked on
June 11, 2020

  1. Chem

    How is the light emitted by an atom related to its electron configuration? A Light is produced when an electron moves from a higher to a lower energy level. The color of the light (as we see it) depends on the amount of energy emitted by the electron. B

  2. Geometry

    Pressing a circular cookie cutter over a tray of 1 inch x 1 inch x 1 inch fudge cubes creates a cylinder. If the cylinder consists of approximately 12.6 fudge cubes, what is the approximate area of the cylinder's base? PLEASE HELP!!

  3. Physics

    A 62kg cyclist changes the speed of a 12kg bicycle from 8.2m/s to 12.7m/s. Determine the work done. Not sure how to start ! Do I calculate the difference or what and which formula

  4. History

    famous for my giant, stone statues of huge heads with long ears, I am found about 2300 miles west of Chile in the pacific ocean.

  5. History

    During what period of Japanese history did the country begin a process of industrialization and modernization? A) Meiji Restoration B) Showa Reinstatement C) Tokugawa shogunate D) Kamakura period I believe it's D?

  6. History

    I was built to house cathedral bells but, the soil on which i stand is too soft, so I don't stand completely upright. I am found in a city about 42 miles west and just south of Florence, Italy

  7. Chem

    The first principle energy level is called the: A Principle one state B Ground state C Atomic state D Hund’s state B?

  8. Mathematics

    3/4 of the girls in SS1 play basketball and 4/7 play volleyball every girl needs at least one of these games if 27 girls play both games how many girls are there in the class

  9. Math

    Which of the following equations have exactly one solution? Choose all answers that apply: Choose all answers that apply: (Choice A) A 52x+52=52x-7852x+52=52x−7852, x, plus, 52, equals, 52, x, minus, 78 (Choice B) B

  10. Chem

    Wavelength of light emitted depends directly on: A The quantity of energy absorbed by an electron. B The specific element the electron belongs to. C The quantity of energy released by an electron. D All of the above D?

  11. Calculus 3

    In the methane molecule, each carbon atom is surrounded by four hydrogen atoms, which form a tetrahedron, with the carbon atom at its center. The bond angle theta is the angle formed by the H-C-H combination. Find the tetrahedron angle theta. Take the C

  12. Science

    Write down the factors on which moment depends upon

  13. Chemistry

    How many moles of Mg2+ and NO3− form for each mole of Mg(NO3)2 that dissolves?

  14. Chemistry

    An aqueous solution of glucose (C6H12O6), called D5W, is used for intravenous injection. D5W contains 54.30 g of glucose per liter of solution. What is the molar concentration of glucose in D5W?

  15. Chemistry

    Ethanol, used in alcoholic beverages, can be produced by fermentation of sucrose. The balanced equation for the fermentation process is shown below. What mass of ethanol (C2H5OH) would be produced when 2.61 g sucrose reacts by this process? C12H22O11(s) +

  16. math/science

    6. In the methane molecule, each carbon atom is surrounded by four hydrogen atoms, which form a tetrahedron, with the carbon atom at its center. The bond angle is the angle formed by the H-C-H combination. Find the tetrahedron angle . Take the C atom to be

  17. Mathematics

    Word problem in simple equations. When a number is added to another number four times as big ,the result is 30. Find the first number

  18. Chemistry

    1-A sample of potassium hydrogen oxalate, KHC2O4, weighing 0.717 g, was dissolved in water and titrated with 18.47 mL of an NaOH solution. Calculate the molarity of the NaOH solution. 2-A 35 mL drinking water sample, whose pH is buffered to 10, is titrated

  19. Calculus

    Find the angle between the vectors i + j and i + 2j-3k.

  20. Mathematics

    2. A dance floor is a square with an area of 1,444 FT(2). What are the dimensions of the dance floor? A. 38 ft x 38 ft B. 38 ft 2 x 38 ft 2 (C.) 361 ft x 361 ft( the answer) Am i correct? D. 361 2 ft x 361 2 ft

  21. Math

    PLEASE HELP ASAP!! Point (4, 2) belongs to the circle with the center at (-1, 1). Which statement verifies that the point (-5, -3) is NOT on the circle? A. (4 + 1)2 + (2 - 1)2 ≠ (-5 + 1)2 + (-3 - 1)2 B. (4 - 1)2 + (2 + 1)2 ≠ (-5 - 1)2 + (-3 + 1)2 C.

  22. Chemistry

    One way to remove lead ion from water is to add a source of iodide ion so that lead iodide will precipitate out of solution: Pb2+(aq) + 2I−(aq) → PbI2(s) What volume of a 1.0 M KI solution must be added to 320.0 mL of a solution that is 0.22 M in Pb2+

  23. Chemistry

    A compound with the empirical formula CH2O has a molar mass of approximately 90 g/mol. What is its molecular formula?

  24. Chemistry

    A compound with the molar mass of approximately 142 g/mol has the composition 50.7% C, 9.9% H, and 39.4% N. What is its molecular formula? Element order CxHyNz.

  25. Programming

    Input in a number representing a car type, until the number 0 is input. There are three types of cars: 1 = luxury, 2 = commercial, 3 = sedan. Count how many of each type there are and print out this total with a message stating what type of car it is.

  26. Math

    Aroom measures 540 cm by 420 . Find the length of the largest square tiles that can be used to cover the floor without requiring any cutting .

  27. Geometry

    Given : M is the mid point of XY Prove : XY = 2* XM M is the midpoint if XY - Given XM ≈ MY - Definition of congruence XM = MY - definition of congruence XM + MY = XY - Segment addition postulate XM + XM = XY - substitution postulate of equality 2 * XM =

  28. Chemistry

    The concentration of citric acid (H3C6H5O7) in citric fruits ranges from 0.005 M to 0.30 M. Consider a 28.4 mL sample of pure lime juice with a citric acid concentration of 0.185 M. How many moles of citric acid are in the sample?

  29. Physical Science

    A bicycle pump contains 250 cm3 of air at a pressure of 90 kPa. If the air is compressed, the volume is reduced to 200 cm3. What is the pressure of the air inside the pump? V1 = 90 and V2 = P1= 250 cm and p9= 200 P1V1 = p2V2 V2=p1V1/p2

  30. Chemistry

    1. The equilibrium constant of the balance reaction below is 1.6 x 10-2 at 25 oC and 2.7 x 10-5 at 125 oC. AB (g) + C (g)  3D (g) Which of the following is wrong for this reaction? a) Adding catalyst does not change the equilibrium constant of the

  31. Chemistry

    The concentration of citric acid (H3C6H5O7) in citric fruits ranges from 0.005 M to 0.30 M. Consider a 12.6 mL sample of pure lime juice with a citric acid concentration of 0.295 M. How many grams of citric acid are in the sample?

  32. Chem

    Which of the following is a correct electron configuration? A 1s2 2s2 2p5 3s2 3p6 4s2 3d10 4p3 B 1s2 2s2 2p6 3s2 3p6 4s2 4p3 C 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3 D 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3 C?

  33. chemistry

    How many miles of vapor are formed when 10 liters of butane gas, C4H10 is burned in oxygen at STP?

  34. Chemistry

    The balanced equation for the combustion of butane, C4H10, is 2 C4H10(g) + 13 O2(g) → 8 CO2(g) + 10 H2O(g) Calculate the moles of CO2 produced when 2.62 moles of C4H10 are allowed to react with 13.37 moles of O2.

  35. Math

    What is the gradient of the striaght line 2y+3x= -8 ? Please explain in depth kind of. Thanks,

  36. history

    How did the spoils system and civil service reform lead to government reform?

  37. Calculus

    Find the vector projection of the vector 6i+3j+2k onto thevector 3i-2j+4k.

  38. Calculus

    Find the work done when the force F =3i+ 3j+ 5kmoves a particle from the point P1(2, 3,-1) to P2(5,4,3). The force is measured in Newtons and the displacement in meters.

  39. Math

    consider the function f(x)= x^3+ax Given that f´(2)=0 ,determine value of a Thanks I need help

  40. MATH

    If A x B = A x C, and A, B, C are nonzero vectors, does it follow that B =C ? Explain.

  41. English

    Did Mr. Peters make the right decision to help him resolve his internal conflict? Compose an argument that is at least one paragraph in length. Support your claims with at least two valid and relevant pieces of evidence from the text, including direct

  42. Physics

    A 17.0 kg crate is pulled a distance of 20.0 m requiring that 1210 Joules of work be done. If the job is done by attaching a rope and pulling with a force of 75 Newtons, at what angle is the rope held?

  43. Algebra

    A wheel tuns through 50 rotation per min a) how many revolution does it make in an hour b)how many degree does it turn through in one second

  44. microeconomics

    what is utility

  45. science

    Which is the effect of producing antibodies that attach to last season's flu virus? A. get this season's flu virus B. receive this season's flu vaccine C. immune to last season's flu virus D. get infected by last season's flu virus

  46. English

    What are some constructive ways communicate their determination to take an action or reach a goal?

  47. English

    What are nonverbal ways people can show determination?

  48. Calculus

    For what values of c are the vectors < 6, c, 2 > and orthogonal ?

  49. mathematics

    A cubiod has a length of 13cm,width 9cm,and height 8cm.find the surface area

  50. Geometry

    Given that P(A) = 0.8 and P(A and B) = 0.6, if A and B are independent events, what is the probability of event B?

  51. Math

    Can someone explain me why the truth table of p-->q, given that p and q are any two propositions, does not agree with the truth values of the direct proof of the following? I know that the general truth table of p-->q takes following form : p , q , p-->q

  52. Math

    PLEASE HELP, PLEASE I AM DESPERATE!! If P(A) = 0.4, P(A and B) = 0.2, and P(A or B) = 0.5, what is P(B)?

  53. algebra

    Given f(x)=3(4^x), what is f^−1 (x)?

  54. chemistry

    Draw the structural formula and give the IUPAC names of the following hydrocarbon.a)CH3CHBrCHBrCH(CH3)CH3

  55. Math

    The measures of the angles of a triangle are in the extended ratio 2:8:10. What is the measure of the smallest angle?

  56. science

    Show your work- ie. What you did to calculate the answer. Remember units! 1. You have a lever with a mechanical advantage of 8. If you are lifting a rock that weighs 400 N, what is the force you must apply to the lever? (2 marks)

  57. Chemistry

    Sodium bicarbonate is sometimes used to neutralize acid spills. If 2.0 L of 9.0 M H2SO4 is spilled, what mass of sodium bicarbonate (NaHCO3) is required to neutralize all the H2SO4?

  58. Chemistry

    what volume of the following solutions is required to obtain 0.277 mol of each solute? 0.228 M AlCl3 2.22 M HCl

  59. Math

    Determine a unit vector that is orthogonal to u = [3, -4, 1] and v = [2, 3, -4]

  60. Chemistry

    Monosodium glutamate (NaC5H8NO4) is used extensively as a flavor enhancer. What is its percent composition?

  61. Math

    The fifth term of an exponential sequence GP is greater than the fourth term by 13 whole number 1over 2 and the fourth term is greater than the third term by 9.find the answer to the common ratio

  62. MATH

    Find the distance from the point P(6, 9 ) to the line y = 3 - 3x.

  63. Calculus

    Find the unit vector tangent to the curve y = x^4 at the point(x,y) = (1,1).

  64. Calculus

    5. Find the angle between the diagonal of a cube and the edge it meets at a vertex.

  65. mathematics

    The sum of the first 2 terms of a G.P is 28,but the sum of the third and fourth is 252.Find the second term of the G.P if the seventh term is 5103

  66. Math

    In your​ class, you have scores of 72, 67, 85, and 76 on the first four of five tests. To get a grade of C, the average of the first five tests scores must be greater than or equal to 70 and less than 80. - Solve an inequality to find the least score you

  67. Math?

    If you do 2/5+17+19+20=100 What is the average number help ples

  68. Math

    I need help also can you explain how you got this answer You mix the letters M, A, T, H, E, M, A, T, I, C, A, and L thoroughly. Without looking, you draw one letter. Find the probability P(A). Write the probability as: a. a fraction in simplest form b. a

  69. Chemistry

    A sample of sodium carbonate, Na2CO3, weighs 44.0 g. Calculate the number of Na2CO3 formula units, the number of Na+ ions, and moles of CO3 2− ions

  70. Physics

    A 40.0cm diameter loop is turned to the position where the largest flux is handled in a uniform electric field. In this position, the flux is obtained as 5.20 × 10 ^ 5 N.m ^ 2 / c. Find the twist of the electric field.

  71. Chemistry

    what volume of the following solutions is required to obtain 0.277 mol of each solute? 0.228 M AlCl3 2.22 M HCl

  72. Chem

    How many orbitals are in the p sublevel? A 2 B 3 C 4 D 5 A? Place gamma rays, infrared, microwaves, radio waves, ultraviolet, visible light, and x-rays in order from largest wavelength to smallest wavelength. A Gamma rays, infrared, microwaves, radio

  73. Chemistry

    Sulfuric acid is commonly used as an electrolyte in car batteries. Suppose you spill some on your garage floor. Before cleaning it up, you wisely decide to neutralize it with sodium bicarbonate (baking soda) from your kitchen. The reaction of sodium

  74. Chemistry

    The balanced equation for the reaction of aluminum metal and chlorine gas is 2Al(s) + 3Cl2(g) → 2AlCl3(s) Assume that 0.40 g Al is mixed with 0.25 g Cl2. What is the maximum amount of AlCl3, in grams, that can be produced?