Most popular questions and responses by Emma
  1. Chemistry

    What would the net ionic equation be for : HBr (aq) + KOH (aq) = KBr + H2O

    asked on October 15, 2017
  2. Language Arts

    Hi! I just need someone to check my work please! :) Thanks! 1. Which of these is the defining characteristic of a comparison-and-contrast essay? A. Clear thesis statement. B. Organizational structure. C. Reliable sources. D. Similarities and differences

    asked on February 17, 2017
  3. physics

    Cliff divers at Acapulco jump into the sea from a cliff 37.1 m high. At the level of the sea, a rock sticks out a horizontal distance of13.39 m. The acceleration of gravity is 9.8 m/s^2. With what minimum horizontal velocity must the cliff divers leave

    asked on February 19, 2013
  4. Math

    Hi! I just want someone to check my answers please! I cannot provide you with any pictures as I have gotten them off of my schools website. You cannot access these pictures because you have to be logged in. 1. Andrea drew triangle JKL as shown. A. The sum

    asked on February 16, 2017
  5. Language

    In "All Together Now," why does Barbara Jordan most likely mention the conflict in Bosnia? A.It shows that people of different ethnic backgrounds can live in peace. B.It shows that improvements in race relations are still necessary despite past progress.

    asked on December 2, 2015
  6. Chemistry

    A battery is constructed based on the oxidation of magnesium and the reduction of Cu^2+. The initial concentrations of Mg^2+ and Cu^2+ are 1.2*10^-4M and 1.5M, respectively, in 1.0-L half-cells. The initial voltage of the battery is 2.83V with the standard

    asked on May 2, 2010

    3. What is the rhyme scheme of the following Anne Bradstreet poem? To Her Father with Some Verses Most truly honored, and as truly dear, If worth in me or ought I do appear, Who can of right better demand the same Than may your worthy self from whom it

    asked on September 4, 2012
  8. history

    How did feudal monarchs in the High Middle Ages centralize power? need explanation

    asked on October 11, 2016
  9. Chemistry

    What volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/mL, should be used to make 4.40 L of an NaOH solution with a pH of 10.5?

    asked on March 17, 2013
  10. Math

    1. Simplify. 3x^2+ 5x-5x^2-4x+5-2 A.-8x^2-9x+3 B.2x^2+x+3 C.-2x^2-9x+3*** D.-2x^2+x+3 2. Add or Subtract.(8x – 2y) + (3x – 4y) A.11x+8y B.4x-y C.11x-6y*** D.5x+2y 3.(5x^2-4x-1)-(-4x^2-4) A.-9x^2-8x-1 B.9x^2-4x+3*** C.x^2-4x-3 D.9x^2+4x-3 4.The distance

    asked on May 5, 2016
  11. calculus

    In the space below, provide the smaller of the two positive integers that add to 40 and have the largest possible product

    asked on April 22, 2015
  12. Chemistry

    A chemistry student needs to standardize a fresh solution of sodium hydroxide. She carefully weighs out 338.mg of oxalic acid H2C2O4 , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250.mL of distilled water. The

    asked on November 7, 2018
  13. Physics

    On an aircraft carrier, a jet can be catapulted from 0 to 155 mi/h in 2.00 s. If the average force exerted by the catapult is 5.53×106 N what is the mass of the jet?__________ kg

    asked on October 12, 2012
  14. math

    Mr. Smith is purchasing a $190000 house. The down payment is 20% of the price of the house. He is given the choice of: (A) a 20-year mortgage at a rate of 6%. Find: (i) The monthly payment: $ (ii) The total amount of interest paid: $

    asked on May 21, 2012
  15. chemistry

    what is the strongest intermolecular force in nitrogen trifluoride

    asked on March 20, 2015
  16. physics

    A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18-wheel truck and accelerates with constant acceleration along the ramp and onto the freeway. The car starts from rest, moves

    asked on September 29, 2013
  17. Math

    A skydiver prepares to jump out of a plane. Explain how gravity and air resistance will affect the motion of the skydiver before and after he or she opens the parachute.

    asked on March 8, 2016
  18. calculus

    If 800 feet of fencing is used to enclose a rectangular plot of land that borders a river, what is the maximum area that can be enclosed? Answer to the nearest square foot without commas. For example, if the answer is 1,000, write 1000.

    asked on April 22, 2015
  19. math miss.sue can u plz check me answers plz

    which of the following appears to be an irrational number? A. 3.7272727272... B. the root of 64 C. -6/25 D. 0.73303330...

    asked on November 19, 2015
  20. math

    you invest $4000 in an account that pays simple interest of 6% for 30 years. calculate the amount of money you'll have at the end of the indicated time period.

    asked on May 16, 2013
  21. Economics

    Can someone check my answers? "Explain how unemployment affects the following groups. Give at least 3 examples for each of the groups; Laborers, Businesses, and Government" Laborers: 1) No longer has a job 2) Families can hurt from lack of money 3)Poor

    asked on November 11, 2015
  22. physics

    2.) A sports car is advertised to be able to stop in a distance of 50m from a speed of 90 km/h. What is its acceleration in m/s^2? How many g's is this (g=9.80 m/s^2)

    asked on December 12, 2015
  23. Urgent math

    The initial size of a culture of bacteria is 1000. After one hour the bacteria count is 4000. (a) Find a function n(t) = n0ert that models the population after t hours. n(t) = b)Find the population after 1.5 hours. (Round your answer to the nearest whole

    asked on August 3, 2015
  24. physics- please help

    Question #1 A 0.140kg- baseball traveling 30.0m/s strikes the catcher's mitt, which, in bringing the ball to rest, recoils backward 14.0cm . What was the magnitude of the average force applied by the ball on the glove? question #2 How much tension must a

    asked on April 29, 2012
  25. Chem

    Separate the following balanced chemical equation into its total ionic equation. AgNO3​(aq)+NaCl(aq) --> NaNO3​(aq)+AgCl(s) (List the ions in order of the above equation.) Write the net ionic equation for the reaction above. (Make sure the cation is

    asked on October 16, 2017
  26. Algebra 2(help please!!)

    Alisha bought a collection of 500 old pennies. She chose 20 pennies from the collection and recorded their dates. Seven pennies had dates earlier than 1980. What percent of the pennies in Alisha’s collection have dates earlier than 1980? How would I

    asked on December 7, 2016
  27. science

    A banana turning brown when exposed to the air is an example of

    asked on November 15, 2016
  28. Geography

    What did the Han emperors do to keep the economy stable A. Stopped merchants from selling goods along the Silk Road B. Brought grain, stored it, and resold it during times of low harvest C.introduced the first standardized coins D. Refused to allow

    asked on November 8, 2018
  29. Math

    Which best describes best describes your ability to graph inequality

    asked on May 4, 2016
  30. Math-Probability

    A law firm has six senior and fourteen junior partners. A committee of 3 partners is selected at random to represent the firm at a conference. What is the probability that at least one of the junior partners is on the committee?

    asked on March 16, 2012
  31. History

    Hey! Just Want A Quick Check Over My Answers! 1. How Did The Zimmermann Note Lead The United States Closer To War? A. It Caused The United States To End Diplomatic Relations With Germany. * B. It Resulted In More U-Boat Attacks On American Ships. C. It

    asked on February 23, 2017
  32. Chemistry

    The complex ion, [Ni(NH3)6]2+, has a maximum absorption near 580 nm. Calculate the crystal field splitting energy (in kJ/mol) for this ion.

    asked on December 6, 2012
  33. calculus

    The area A = πr2 of a circular water ripple changes with the radius. At what rate does the area change with respect to the radius when r = 4ft?

    asked on April 13, 2015
  34. alg 1

    It takes a florist 3 hour and 15 minutes to make 3 small centerpieces and 3 large centerpieces. It takes 6 hours and 20 minutes to make 4 small centerpieces and 7 large centerpieces. How long does it take to make each small centerpiece and each large

    asked on January 30, 2012
  35. physics help plz

    One 3.5 kg paint bucket is hanging by a massless cord from another 3.5kg paint bucket, also hanging by a massless cord, as shown in the figure . Part a) If the buckets are at rest, what is the tension in lower and higher cord ? Part b)If the two buckets

    asked on May 6, 2012
  36. Chemistry

    The temperature rises from 25.00 °C to 29.00 °C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. Calculate ÄErxn for the combustion of sucrose in kJ/mol sucrose. The heat capacity of the calorimeter is 4.90 kJ/°C

    asked on December 6, 2012
  37. algebra

    does the data in the table represent a linear function? if so, wirte a rule for the function. (below is what the table looks like) x | -2| -1| 0 | 1| 2| y | -7| 1| 8 | 17| 25| answer choices yes; y = 8x +9 yes; y = 8x + 8 no yes; y = 1/8x + 8

    asked on June 5, 2014
  38. Trigonometry

    Given that sin^2x = 4/13, what is the cos^2x? I am so lost. I need to show my work. Please help. THANK YOU!

    asked on August 30, 2017
  39. Chemistry

    Thyroxine, an important hormone that controls the rate of metabolism in the body can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution could be measured as 5.144°C. Pure

    asked on January 21, 2013
  40. physics

    question : net force of 225 N accelerates a bike and rider at 2.65m/s^2. What is the mass of the bike and rider together ?

    asked on April 29, 2012
  41. Algebra

    Which is an equivalent form of the expression 1800(1.2)–t? Is 1800(1/2)^t correct?

    asked on June 28, 2014
  42. English

    I have to read the book 'Nethergrave' by Gloria Skurzynski, but the online book doesn't seem to want to open on either of my computers so I assume the site is down. Does anyone know where I could find the book somewhere else online, I've been searching

    asked on December 31, 2015
  43. science

    A geneticist is studying a pedigree that shows the family history of a recessive genetic disease. Which of the following pedigrees shows an impossible relationship? (

    asked on November 23, 2013
  44. Chemistry

    How many atoms of carbon are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

    asked on December 6, 2012
  45. Chemistry

    combustion analysis of 63.8 mg of C,H, and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound?

    asked on December 6, 2012
  46. MATH

    One light flashes every 2 minutes and another light flashes every 3.5 minutes. Suppose both lights flash together at noon. What is the first time after 1 PM that both lights will flash together ?

    asked on June 26, 2012
  47. Chemistry

    Which of the following is NOT true for ΔGrxn? A.) If ΔG°rxn > 0, the reaction is spontaneous in the forward direction. B.) If Q = 1, then ΔGrxn = ΔG°rxn.If ΔG°rxn = 0, the reaction is spontaneous in the reverse direction. C.) If ΔG°rxn > 0, the

    asked on November 16, 2014
  48. geometry

    Campsite F And G Are On Opposite Sides Of The Lake.A Survey Crew Made Measurements Shown On The Diagram .What Is The Distance Between The Two Campsites?

    asked on August 17, 2012
  49. Psychology

    9.By means of introspection, Dr. Marsh attempts to determine the components of things like perception, thinking, and consciousness. By contrast, Dr. Smyth wants to understand what the mind does in producing different kinds of behavior. We can reasonably

    asked on May 4, 2016
  50. Chemistry

    Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.140 M HClO(aq) with 0.140 M KOH(aq).HClO is a weak acid with a Ka of 4.0× 10–8. It reacts with strong base to produce ClO–. (e) after addition of 60.0 mL of KOH

    asked on April 25, 2013

    a locomotive pulls 10 identical freight cars. the force between the locomotive and the first car is 100,000 Newtons, and the acceleration of the train is 2m/s^2. there is no friction to consider.what is the force between the ninth and tenth cars?

    asked on July 7, 2014
  52. Honors English 11

    Can someone check my answer please? Q: Read and analyze "When I heard the learn'd Astronomer" by Walt Whitman. What romantic ideas does it express, and how does the structure of the poem reinforce the meaning? -When i heard the learn'd astronomer; When the

    asked on October 29, 2015
  53. algebra

    what is 2n>14 What is n/5>11 - what is -3y

    asked on September 29, 2016
  54. AP Language & composition

    What two pieces of information are necessary each time you cite a source in the text of your paper?

    asked on September 3, 2012
  55. science

    The radius of the Earth is approximately 3,960 miles. Find the approximate surface-area-to-volume ratio of the Earth. A. 0.00025 B. 0.00076 C. 1,320 D. 11,880

    asked on July 10, 2013
  56. physics- please help !

    A box weighing 65.0 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end. Part a) Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley

    asked on May 6, 2012
  57. Algebra 2(help please!!)

    1. Tony decides to use observation. He visits 10 students and observes them doing schoolwork at home for 30 min. If a student looks at social media during that time, he notes it. (a) Provide an advantage of using observation. (b) Provide a disadvantage of

    asked on December 7, 2016
  58. chemistry

    Liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 3.45 g of hexane is mixed with 16.3 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be

    asked on December 6, 2011
  59. Pre-Algebra A

    A company reports $23,765 in income and $18,945 in expenses for February. What was the amount of profit or loss for the month? A. $4,820 profit B. $4,820 loss C. $5,220 profit

    asked on February 13, 2019
  60. History

    1.Which answer best describes a reason why industries flourished in New England? A- The people in New England had more work experience. B- New England had more lakes to use for water in factories. C- The soil was better than in the South so they could grow

    asked on April 28, 2015
  61. History

    Which explains why the Compromise of 1850 intensified the argument about slavery? A- People for and against slavery migrated to Western stats to influence laws. B~Free states in the West added more antislavery votes to Congress. C~The equal division of

    asked on April 27, 2015
  62. calculus

    The height of a cylinder with a fixed radius of 4 cm is increasing at the rate of 2 cm/min. Find the rate of change of the volume of the cylinder (with respect to time) when the height is 14cm.

    asked on April 13, 2015
  63. Geography

    What was the result of the development of the Silk Road

    asked on November 8, 2018
  64. biology

    If an atom of sulfur (atomic number 16) were allowed to react with atoms of hydrogen (atomic number 1), which of the molecules below would be formed? a.S-H b.H-S-H c.H-S-H | H d.H | H-S-H | H e.H=S=H

    asked on December 11, 2008
  65. history

    what was the napoleonic code?

    asked on October 18, 2010
  66. Chemistry

    Two fixed charges, -4μC and -5μC, are separated by a certain distance. If the charges are separated by 20cm, what is the magnitude of the electric field halfway between the charges? My textbook says that the formula for electric field is (kq)/r^2. But

    asked on February 9, 2016

    a 2.00kg object A is connected with a massless string across a massless, frictionless pulley to a 3.00kg object B. the smaller object rests on an inclined plane which is tilted at an angle of theta=40degrees. what are the acceleration of the system and the

    asked on July 8, 2014
  68. unscrambling word

    Can you help me unscramble these words please! radmordey conshorier trinabac mecal minglem bobing lukarak its in spanish- srecmoro, and tsmnoamo- help please england antelope is the answer tyler! lafrpty=flytrap lafrpty=flytrap please help me to unscramble

    asked on June 14, 2005
  69. algebra

    Match the inequality to its graph. A. less than or equal to -1 B. less than 3 C. less than 1 D. less than or equal to -3 7. 4y + 3 *less than or equal to* y+6 8. -2y > 2 9. y over 3 < -1 10. 3y *less than or equal to* 2y +

    asked on September 30, 2016
  70. Science

    1.Infrared radiation has wavelengths ranging from about 800 nm to 1 mm. What is the frequency of radiation of wavelength 970 nm? Answer in units of s−1 . 2.Microwaves, such as those used for radar and to heat food in a microwave oven, have wavelengths

    asked on February 12, 2015
  71. physics

    A shot-putter throws the shot ( mass = 7.3 kg) with an initial speed of 15.0 m/s at a 33.0 degreCalculate the horizontal distance traveled by the shot if it leaves the athlete's hand at a height of 1.90 m above the ground.e angle to the horizontal.

    asked on October 12, 2011
  72. physics

    A large boulder is ejected vertically upward from a volcano with an initial speed of 39.0m/s . Air resistance may be ignored. (a) At what time after being ejected is the boulder moving at a speed 19.0m/s upward? (b) At what time is it moving at a speed

    asked on September 29, 2013
  73. Chemistry

    Calculate the molar enthalpy for the following reaction. HCl(aq) + NH3 (aq) --> NH4Cl (aq). HCl = 50 ml (2.00M) NH3 = 50 ml (2.05 M) Delta T = 9.28 degrees Celsius. Ccal = 28.9J/g degrees celcius.

    asked on November 12, 2012
  74. Geometry

    Three interior angles of a convex heptagon measure 125 degrees, and two of the interior angles measure 143 degrees. Which are possible measures for the other two interior angles of the heptagon? 1: 48 and 48 degrees 2: 39 and 100 degrees 3: 100 and 116

    asked on January 7, 2016
  75. calculus

    A firework is launched at the rate of 10 feet per second from a point on the ground 50 feet from an observer. To 2 decimal places in radians per second, find the rate of change of the angle of elevation when the firework is 40 feet above the ground. Type

    asked on April 20, 2015
  76. environment

    Oil spills and leaks in the Pacific Ocean have harmed marine organisms and the environment. Which kind of environmental issue is illustrated by this example?

    asked on May 7, 2014
  77. Physics (again, sorry)

    A swimmer maintains a speed of 0.15 m/s relative to the water when swimming directly toward the opposite shore of a straight river with a current that flows at 0.75 m/s. (a) How far downstream is the swimmer carried in 1.5 minutes? (b) What is the velocity

    asked on November 29, 2007
  78. Algebra

    Simplify the rational expression. State any restrictions on the variable. t^2+4t-12/t^2-4

    asked on March 7, 2019

    a ball is dropped from rest at 25m above the ground. how fast is it moving at 10 m above the ground and b) how much time does it take to reach the ground? no air resistance.

    asked on July 12, 2014
  80. algebra

    I NEED HELP ! Match the inequality to its graph. A. less than or equal to -1 B. less than 3 C. less than 1 D. less than or equal to -3 7. 4y + 3 *less than or equal to* y+6 8. -2y > 2 9. y over 3 < -1 10. 3y *less than or equal to* 2y +3

    asked on September 30, 2016
  81. chemistry

    Which statement describes a chemical reaction at equilibrium? A. The forward reaction happens slightly faster than the reverse reaction. B. The reaction has stopped because all reactants have been used up. C. The forward reaction happens at the same rate

    asked on September 10, 2016
  82. calculus

    A 15-ft ladder rests against a vertical wall. If the top of the ladder slides down the wall at a rate of 0.33 ft/sec, how fast, in ft/sec, is the bottom of the ladder sliding away from the wall, at the instant when the bottom of the ladder is 9 ft from the

    asked on April 13, 2015
  83. Pythagorean Theorem

    Paul sketches a right triangle with legs of length a and b and a hypotenuse of length h. He writes an equation that relates lengths a, b, and h. Then he writes an expression for the length of the hypotenuse. Which equation does he write? √a^2 - b^2

    asked on July 17, 2019
  84. Chemistry

    Suppose 0.780 of potassium iodide is dissolved in 150. mL of a 51.0mM aqueous solution of silver nitrate. Calculate the final molarity of iodide anion in the solution. You can assume the volume of the solution doesn't change when the potassium iodide is

    asked on November 7, 2018
  85. Math

    What is the combined height of 3 nickels, 2 nickles, and 1 nickle

    asked on February 25, 2015
  86. History

    How were William Lloyd Garrison and the Rev. Elijah Lovejoy alike? Both lived in Boston and were Underground Railroad conductors. Both printed newspapers with antislavery messages in the North. Both used their houses as Underground Railroad stations and

    asked on April 20, 2015
  87. Psychology

    5.Regarding the trichromatic theory of color vision, which statement is most accurate? A. The theory maintains that receptor cells are grouped in pairs, such as black-white. B. Specialized cells in the retina engage in a process called feature detection.

    asked on May 4, 2016
  88. History

    1. How did new England's textile industry affect both children and women? a) It allowed them to earn a living wage until the age of 25. b) It gave them opportunities not available on family farms. c) It permitted them to complete their schooling. d) It

    asked on March 24, 2015
  89. Math

    The third term of a geometric progression of positive terms is 18 and the fifth term is 162 Find the common ration and the first term? Write an expression for the Nth term of the progression? Find the sum of the first 8 terms of the progression??

    asked on June 14, 2017
  90. science

    The iodine-131 nuclide has a half-life of 8.0 days. If you originally have a 257 g sample, after 48 days how much will you have?

    asked on May 5, 2017
  91. College Physics

    A 22.9-kg child is on a swing attached to ropes that are L = 1.33 m long. Take the zero of the gravitational potential energy to be at the position of the child when the ropes are horizontal. Part A)The child's gravitational potential energy when the child

    asked on February 20, 2011
  92. Psychology

    Dr. Jones is interested in how human behavior may be genetically inherited from remote ancestors, such as chimpanzees. Her field of interest is A. chemical psychobiology. B. evolutionary psychology. C. clinical neuropsychology. D. behavioral genetics. I

    asked on May 4, 2016
  93. history

    which of the following describes the role of an anthropologist? ( 1 point ) a) a person who studies the origin and development of humans b)a person who searches for artifacts from prehistory people c) a person who excavates remains from early communities

    asked on September 24, 2019
  94. Math

    If two cylinders are similar, find the scale factor of the smaller figure to the larger figure. The surface area of the smaller area is 20 pi yards squared. The surface area of the larger cylinder is 125 pi yards squared. No radius or height is given, and

    asked on March 26, 2017
  95. MATH

    f 210 people said football was their favorite sport to watch, how many people were surveyed? Football is labeled on the circle graph as 42%.

    asked on January 25, 2019
  96. Chemistry

    The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H2SO4 solution (in M)?

    asked on December 6, 2012
  97. History

    What was the impact of the Scopes Trial on education in the United States? A. It was the first significant effort to draw interest in the separation of church and state in education. B. It promoted grassroots legal efforts to fortify the need for teaching

    asked on March 15, 2019
  98. physic

    a 2.00kg object A is connected with a massless string across a massless, frictionless pulley to a 3.00kg object B. the smaller object rests on an inclined plane which is tilted at an angle of theta=40degrees. what are the acceleration of the system and the

    asked on July 7, 2014
  99. math

    Assume you want to accumulate $125,000 for a long-range goal in 40 years. You have two choices. Plan A is an account with annual compounding and an APR of 5%. Plan B is an account with continuous compounding and an APR of 4.5%. How much of an investment

    asked on May 14, 2013
  100. precal

    If p(t) is the profit I expect my business to earn t years after opening, use functional notation to express my expected profit after 4 years and 4 months. (Round your answer to two decimal places.)

    asked on August 31, 2018


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