Most popular questions and responses by tina
  1. Chemistry

    Part A Calculate the standard enthalpy change for the reaction 2A+B --->2C +2D Use the following data: Substance Delta H(kJ/mol) A -263 B -391 C +203 D -523 Express your answer in kilojoules. MY ANSWER FOR PART A: Delta H =277 kJ PART B----THIS ONE I NEED

    asked on June 16, 2011
  2. Spanish- Sin a or a

    I have to chose whether or not the sentence needs preposition a or no a (sin a) 1) ¿Conoces__ alguien que organice fiestas de aniversario? 2)Busco__ alguien que me ayude a organizar la mía. 3)Necesito __ un grupo musical que sea bueno. 4) Lo siento, no

    asked on April 3, 2014

    2. Read the following lines of dialogue spoken by Dr. Warren and Johnny in Chapter VI. “My boy,” came the doctor’s gentle voice, “Let me see your hand.” Johnny did not face him. He said nothing.“You don’t want me to look at it?” As long as

    asked on January 6, 2015
  4. chemistry

    11.During an acid-base titration, 25 mL of NaOH 0.2 M were required to neutralize 20 mL of HCl. Calculate the pH of the solution for each of the following: 12.Before the titration. 13.After adding 24.9 mL of NaOH. 14.At the equivalence point. 15.After

    asked on May 8, 2013
  5. social studies 8th

    1. What was an underlying source of tension in westward expansion during the 1850s? (1 point) the inflation of goods a sharp decrease in population whether newly added territories should allow slavery **** disagreement over whether the economy of new

    asked on January 24, 2015
  6. chem 2

    A buffer is prepared by adding 300.0mL of 2.0M NaOH to 500.0mL of 2.0M CH3COOH. What is the pH of this buffer? ka=1.8x10-5

    asked on March 3, 2012

    hi please check these math answers! 13. If 4 out of 20 people like red jelly beans, what percent of the people do not like red jelly beans? A.5% B.20% C.80%(I PICK THIS) D.90% 14. Sally is photocopying a picture. The original picture was 4 inches wide and

    asked on February 10, 2014
  8. spanish

    celoso/a compartir deprimido/a discutir inmaduro/a mal odiar separarse tener celos María y Pedro se conocieron la semana pasada. Se llevan muy bien. María es muy simpática y Pedro es muy gracioso. Pedro coquetea mucho con María. Creo que se quieren

    asked on February 5, 2014
  9. Langague Arts 8th Grade

    3. What does Johnny’s mastery of riding Goblin show about his character? (1 point) He is rash and quick-tempered. He is brave and determined. He is immature and selfish. He is arrogant and proud. 4. Which of the following statements most accurately

    asked on January 4, 2015
  10. Spanish

    I need major help in translating these numbers into Spanish correctly. Thanks 570 quinientos setenta 46.500 cuatro seistente 726 setecientos y veintiseis 489 cuatrocientos ochenta y nueve 1.950.020 uno millones noventa y ciento mil

    asked on December 3, 2013
  11. History

    Which most accurately describe the impact of the Crusades on the Jewish community? (Select all that apply.) During the Fourth Crusade, Saladin entered the Crusades and massacred Jews in Constantinople. During the Second Crusade, French and German kings

    asked on October 17, 2017
  12. Chemistry

    what happens when NaCl(s) is dissolved in water? (1)Cl-ions are attracted to the oxygen atoms of the water (2)Cl-ions are attracted to the hydrogen atoms of the water. (3)Na+ions are attracted to the hydrogen atoms of the water. (4)no attractions are

    asked on February 13, 2011
  13. Chemistry

    When an aqueous solution of sodium hydroxide, NaOH, is added to an aqueous solution of chromium(III) nitrate, Cr(NO3)3, a precipitate of chromium(III) hydroxide, Cr(OH)3, forms. Write a balanced net ionic equation for this reaction.

    asked on March 1, 2016
  14. math

    Alana bought 3/8 pound of swiss cheese and 1/4 pound of American Cheese. Which pair of fractions cannot be used to find how many pounds of cheese she bought in all a)6/16 and 4/16 b)9/24 and 6/24 c)24/64 and 8/64 d)15/40 and 10/40

    asked on April 10, 2013
  15. Organic Chemistry

    what is the name of the amide that is formed by the following reaction: Butanoic acid + Methylamine? - CH3CH2CH2COOH + CH3NH2 ---> product + H2O? i put n-methylbutyramide and they counted it wrong.

    asked on January 21, 2010
  16. physics

    a-28-g rifle bullet traveling 230m/s buries itself in a 3.6-kg pendulum hanging on a 2.8-m-long string, which makes the pendulum swing upward in an arc. determine the vertical and horizontal components of the pendulum's displacement.

    asked on September 2, 2018
  17. History

    Which most accurately describes consequences of the Renaissance in Europe? A. The Renaissance led to the Ottoman Empire sailing to the New World and conquering Central and South America. B. The Renaissance led to the Catholic Church having a monopoly on

    asked on November 2, 2018
  18. Physics

    You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. You shoot the gun straight up, and it takes 3.8 s for the dart to land back at the barrel. What is the maximum

    asked on October 17, 2011
  19. Math

    Here is the question:Consider a data set of 15 distinct measurements with mean A and median B. (a) If the highest number were increased, what would be the effect on the median and mean? Explain. The mean would remain the same while the median would

    asked on December 11, 2016
  20. computer

    17. Which of the following sources likely has the most reliable information? A. A graduate student's blog that was updated ten months ago B. A company-sponsored website with detailed citations C. A computer science textbook written by an expert in the

    asked on April 28, 2015
  21. Chemistry

    Would the R (PV=nRT)value go up or down if you had not corrected the gas for partial pressure of water? I was thinking down but im not sure

    asked on January 21, 2010
  22. consumer math

    Jim opened an account with $400. The account pays three percent quarterly. How much is in the account at the end of two years? Round to the nearest dollar. (Points : 1) 5. Use this table to answer questions 5 through 8. Principal Rate Compounded Time Final

    asked on February 12, 2012
  23. Science

    How are Newton’s second and third laws of motion important to your everyday life?

    asked on January 23, 2015
  24. English 11 B

    Langston Hughes Questions: 1. Why does Edward hand over his belongings? (1 point) A. He is afraid. B. He feels sorry for the men. C. He is in a hurry and thinks he will be able to get to his destination more quickly if he does as he is told. D. none of the

    asked on January 15, 2013
  25. I HATE LA 1 question

    which of the following sentence is an adjective? Jack trudged home through deep snow A. Trudged B. Through C. Deep*** D. Home help plz and thank you and fast

    asked on January 21, 2016
  26. History

    When Truman used the phrase "alternate ways of life," what two ways of life was he talking about? This is from my book: "At the present moment in world history nearly every nation must choose between alternative ways of life. The choice is too often not a

    asked on June 18, 2014
  27. History

    Which accurately describes the involvement of the Catholic Church in medieval European governments? The Catholic Church forced European lords and barons to spare extra lands for peasant farmers. The rules and rituals of the Church guided the administration

    asked on October 16, 2017
  28. chem

    An automobile burns 65 grams of gasoline over 20 minutes. The gasoline combines with 100 grams of oxygen in this reaction, to form carbon dioxide and 47 grams of water. How much carbon dioxide is formed? do I use the heat capacity equation? How much oxyen

    asked on February 14, 2007
  29. physics

    in a ballistic pendulum experiment, projectile 1 result in a maximum heigh h of the pendulum equal to 2.6 cm. a second projectile causes the pendulum to swing twice as high, h2=5.2 cm. the second projectile was how many times faster than the first?

    asked on September 2, 2018
  30. ELA


    asked on November 23, 2015
  31. Physics

    A loudspeaker of mass 25.0 kg is suspended a distance of 1.00 m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of 2.50 m . What is the tension in each of the cables?

    asked on February 20, 2011
  32. Chemistry

    A 15.5 mL sample of 0.215 M KOH solution requires 21.2 mL of acetic acid in a titration experiment. Calculate the molarity of the acetic acid solution. Please show all steps, I don't understand this.

    asked on May 23, 2011
  33. Physics

    A tether ball of mass 0.25 kg is attached to a vertical pole by a cord 1.4 m long. Assume the cord attaches to the center of the ball. The cord makes an angle of 20° with the vertical. (a) What is the tension in the cord? (b) What is the speed of the

    asked on October 12, 2011
  34. Chemistry

    If 15.omL of 0.0250 M aqueous H2SO4 is required to neutralize 10.0 mL of aqueous solution of KOH, what is the molarity of the KOH solution?

    asked on May 23, 2011
  35. MATH

    You’re building a rectangular frame 10 inches by 11 inches. How many feet of wood do you need?

    asked on July 9, 2012
  36. Finance - Loans problem please help

    A company borrows $170000, which will be paid back to the lender in one payment at the end of 5 years. The company agrees to pay monthly interest payments at the nominal annual rate of 7% compounded monthly. At the same time the company sets up a sinking

    asked on April 1, 2015
  37. chemistry

    how many moles of gold are there in 1.00 L of seawater if there are 1.50^17 atoms of gold in the sample?

    asked on April 25, 2013
  38. math

    Dan has saved $500. He wants to open a chequing account at Save-A-Lot Trust or Maple Leaf Savings. Save-A-Lot Trust's chequing account is $10 per month plus $0.75 per cheque. Maple leaf savings' chequing account is $7 per month plus $1.00 per cheque. Which

    asked on September 24, 2015
  39. science

    6. A farmer planted a field of Bt 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 22 ears in 1/1000 of an acre. He determines that each ear has about 700 kernels on average. He also knows that a bushel contains about 90 000

    asked on February 1, 2010
  40. physics

    In order to keep a leaking ship from sinking, it is necessary to pump 12.0 lb of water each sec from below deck up a height of 2.00 m and over the side. What is the minimum horsepower motor that can be used to save the ship?

    asked on April 10, 2008
  41. Chemistry

    Balloon- CO2 Balloon- O2 Balloon- He Balloon- N2 Balloon- CH4 Represented above are five identical balloons, each filled to the same volume at 25 degrees Celcius and 1.0 atmosohere pressure with the pure gases indicated. A) which balloon contains the

    asked on October 22, 2006
  42. Beginner Spanish -Check my answers please

    Select the correct forms of ser or estar to complete the sentences. 1. Aquí __ las fotos de mis vacaciones en España. Mira, __ muy bonitas. están, son estoy, somos son, están soy, está 2. Aquí __ con mi familia en la playa cerca de Barcelona. Esta

    asked on November 12, 2013
  43. managerial

    The demand curve for haircuts at Terry Bernard's Hair Design is P=20-0.20Q where Q is the number of cuts per week and P is the price of a haircut. Terry is condering raising her price above the current price of $15. Terry is unwilling to raise price if the

    asked on August 8, 2010
  44. physics #22

    A length of wire is bent into a closed loop and a magnet is plunged into it, inducing a voltage and,consequently, a current in the wire. A second lenghtof wire, twice as long, is bent into two loops of wire, and a magnet is similarly plunged into it. Twice

    asked on February 14, 2008
  45. Introduction to CARS Passages

    CARS 1: Introduction to CARS Passages Passage I Those who consider the Devil to be a partisan of Evil and angels to be warriors for Good accept the demagogy of the angels. Things are clearly more complicated. Angels are partisans not of Good, but of Divine

    asked on November 1, 2015
  46. Physics

    A string with a linear density of 0.035 kg/m and a mass of 0.014 kg is clamped at both ends. Under what tension in the string will it have a fundamental frequency of 100 Hz? The correct answer is 270N but I don't know how to get there. Here are some of the

    asked on July 13, 2011
  47. biology

    In both lecture and lab, the significance of water (H2O), molecular oxygen (O2), and carbon dioxide (CO2) has been emphasized with regard to their energy content or participation in metabolic oxidation and reduction reactions. This lab has demonstrated

    asked on October 27, 2010
  48. Chemistry

    What do we mean when we say that concentrated nitric acid (HNO3) is 16 molar?

    asked on March 24, 2013
  49. physics

    two charged particles are projected into a magnetic field that is perpendicular to their velocities. if the particles are deflected in opposite directions, what dose this tell you about them?

    asked on February 6, 2008
  50. maths

    prove that tan(45+theta)+tan(45-theta)=2sec2theta

    asked on August 10, 2012
  51. chemistry

    what volume ( in mL) of a 0.680 M KBr solutionwould you need if you want 4.00 grams of KBr?

    asked on March 30, 2019
  52. math

    A ladder of length 6m leans against a vertical wall so that the base of the ladder is 2m from the wall. calculate the angle between the ladder and the wall

    asked on February 19, 2016
  53. Chemistry problem

    How many moles of UF6 would have to be decomposed to provide enough fluorine to prepare 2.14 mol of CF4? I'm not sure how to solve this problem? So far all I did is calculate the moles of F in CF4, which is 8.56 moles

    asked on September 20, 2015
  54. Chemistry 105

    How many mL of O2 will form from 55.2g KClO3?

    asked on October 22, 2011
  55. statistics

    A random sample of state gasoline taxes in cents is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does you interval contain the national average of 44.7 cents? 38.4 40.9 67 32.5 51.5 43.4 38

    asked on October 5, 2011
  56. Math

    Describe two ways to determine the larger of two fractions. A. Compare fractions by writing fractions as mixed numbers B. Compare fractions with the same denominator by comparing the numerators and compare fractions with different denominators by writing

    asked on October 25, 2017
  57. Please Help me with a Finance - Loan problem

    A company borrows $170000, which will be paid back to the lender in one payment at the end of 5 years. The company agrees to pay monthly interest payments at the nominal annual rate of 7% compounded monthly. At the same time the company sets up a sinking

    asked on April 1, 2015
  58. Chemisty

    Describe how you would prepare 250 ml of a 0.10M NaCl solution?

    asked on November 17, 2010
  59. Chemistry

    Take a look at the following uses of the term entropy by several historical figures: Anton Chekhov considered by some as being one of the greatest short story writers said, "Only entropy comes easy." Vaclav Havel, playwright and the first president of the

    asked on June 3, 2018
  60. Thermodynamics

    Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.

    asked on April 12, 2013
  61. physics

    A dip needle is a small magnet mounted on ahorizontal axis so that it can swivel up or down like a compass turned on it's side) where on earth will a dip needle point most nearly vertically? where will it point most nearly horizontally?

    asked on February 5, 2008
  62. chemistry

    Write ksp for ba3(po4)2 in an aqueous solution

    asked on April 30, 2012
  63. physics

    A fish hangs from a spring scale supported from the roof of an elevator. a) if the elevator has an upward acceleration of 1.2 m/s^2 and the scale reads 200 N, what is the true force of gravity on the fish? b) under what circumstances will the scale read

    asked on December 28, 2018
  64. Physics

    a 4,500 kg roller coaster starts from the top of a 45 m hill with a velocity of 3m/s. The car travels to the bottom through a loop and continues up the next hill. The end of the roller coaster has a level surface that is 4m off the ground. Assume that

    asked on December 14, 2017
  65. english

    what is the thesis of this essay called "i want a wife" -judy brady 1- I belong to that classification of people known as wives. I am A Wife. And, not altogether incidentally, I am a mother. 2- Not too long ago a male friend of mine appeared on the scene

    asked on September 14, 2014
  66. algebra

    Show all steps solve the equation 0.25r-0.125+0.5r=0.5+r

    asked on February 24, 2014
  67. math

    an artist intends to paint a 60-square-foot mural on a large wall. find the dimensions of the mural if the artist leaves a border of uniform width around it.

    asked on May 2, 2015
  68. Spanish

    Can I get help with revisions: 1. ¿Le escribe Rolando un correo electrónico a Miguel? 2. ¿Nos trae el botones las maletas a la habitación? 3. ¿Les dan gafas de sol los vendedores a los turistas? 4 ¿Te compra botas en el invierno tu mamá? 5 ¿Les

    asked on November 24, 2013
  69. Chemistry

    what is the total number of moles in 80.0 grams of C2H5Cl (gram-formula mass=64.5grams/mole)? (1)0.806 (2)1.24 (3)2.48 (4)5.16 please help !

    asked on January 3, 2011
  70. physics

    A 62.0-kg baseball player begins sliding 3.40 m from third base w/ speed of 4.35 m/s. If the player comes to rest at third base (a) how much work was done on the player by friction? (b) what was the coefficient of kinetic friction between the player and

    asked on April 10, 2008
  71. Math (Pre-Calc)

    An airplane is flying east at a constant altitude of 28,000 meters. When first seen to the east of an observer, the angle of elevation to the airplane is 71.5 degrees. After 73 seconds, the angle of elevation is 51.6 degrees. Find the speed of the

    asked on April 7, 2012
  72. Math

    BLIND BATS AT HALLOWEEN There were number of bats in a cave. Two bats can see out of right eye, Three bats can see out of left eye, Four can't see out of left eye, and Five can't see out of right eye. What is the least number of bats in the cave & what

    asked on November 8, 2009
  73. programming logic

    Find Bugs in the pseudocode // A high school is holding a recycling competition // This program allows a user to enter a student's // year in school (1 through 4) // and number of cans collected // Data is entered continuously until the user wnats to quit

    asked on April 15, 2012
  74. Chemistry

    In phosphoric acid, why is it relatively easy to remove the first proton, considerably harder to remove the second proton, and extremely difficult to remove the third proton in chemical reactions? I'm not sure about this one is it because each time a

    asked on March 5, 2012
  75. Physics

    A diver running 1.8 m/s dives out horizontally from the edge of the cliff and 3 s later he reaches the water below. (a) Calculate the resultant velocity (with direction) of the diver just before he hits the water. (10) (b) How high is the cliff, and how

    asked on March 12, 2015
  76. algebra

    Show all steps solve the formula for the indicated variable T=3u/e for u

    asked on February 24, 2014
  77. grammar

    Deep tendon reflexes were intact, with an upgoing toe on the left. which are conjunctions and prepositions? intact = preposition conjunction = upgoing

    asked on July 5, 2009
  78. physics

    A 62.0-kg baseball player slides 3.40 m from third base w/ a speed of 4.35 m/s. If the player comes to rest in third base , (a) how much work was done on the player by friction? (b) what was the coefficient of the kinetic friction between the player and

    asked on April 10, 2008
  79. Finance; Stock Valuation

    Early in 2007, Inez Marcus, the chief financial officer for Suarez Manufacturing, ws given the task of assessing the impact of a proposed risky investment on the firm's stock value. To perform the necessary analysis, Inez gathered the following information

    asked on July 22, 2007
  80. algebra 1

    A farmer can plow a given field in 7 hours. If his son helps him, they can plow the field together in 4 hours. How long would it take his son to plow the field alone? Express your answer as a fraction reduced to lowest terms, if needed.

    asked on October 6, 2015
  81. Physics

    Your teacher tosses a basketball. The ball gets through the hoop (lucky shot). Height of hoop= 3.048m height of person= 2.342 m the ball is thrown at 17 m/s at an angle of 46 degress Part 1: How long does it take the ball to reach its max height? Part 2:

    asked on November 2, 2011
  82. Chem

    what occurs during the reaction below 4Hcl+MnO2-->MnCl2+2H2O+Cl2 1.the manganese is reduced and its oxidation number changes from +4 to +2. 2.the manganese is oxidized and its oxidation number changes from +4 to +2. 3.the manganese is reduced and its

    asked on March 20, 2011
  83. physics

    a golf club exerts and average force of 1000N on a 0.045-kg golf ball which is initially at rest. the club is in contact with the ball for 1.8ms. what is the speed of the golfbal !@#$%^& it leaves the tee? a batter applies an average force if 8000N to a

    asked on February 25, 2009
  84. Math

    Every Saturday, Greg walks 2 1/4 miles to the park to play basketball with friends. He walks 2/3 of this distance when he walks to school. How far does Greg walk to school?

    asked on March 24, 2019
  85. math

    Hank sells furniture and earns $280/week plus 4% commission. a) Determine the sales that Hank needs to make to meet his weekly budget requirement of $900. b) Write an equation for this situation, and use it to verify your answer for part. Let x represent

    asked on September 14, 2015
  86. Physics

    Question: Two strings at different lengths and linear densities are joined together. They are stretched so that the tension in each string is 190.0 N. The free ends are fixed in place. Find the lowest frequency that permits standing waves in both strings

    asked on July 11, 2011
  87. math-geometry

    how/where would i use incenter, orthocenter, circumcenter, and centroid in real life situations?

    asked on September 9, 2009
  88. Physics

    Light is bent as it enters a tank of water from air. It is bent to a greater angle when it goes from air to a glass block. Calculate the angle of refraction of 30.0° light shines from water into ice. The indices of refraction for water and ice are 1.36

    asked on March 24, 2016
  89. English

    I need help identifying the thesis in this essay. please help! "Why i want a Wife" -Judy Brady 1- I belong to that classification of people known as wives. I am A Wife. And, not altogether incidentally, I am a mother. 2- Not too long ago a male friend of

    asked on September 14, 2014
  90. Algebra

    Can someone help me with these two questions? What is the 50th term of the sequence that begins -4, 2, 8, 14...? What is the 20th term of the sequence that begins -3, 6, -12, 24...?

    asked on May 29, 2013
  91. Algebra

    Sue can shovel snow from her driveway in 45 minutes. Jim can do the same job in 55 minutes. How long would it take them if they worked together?

    asked on November 27, 2011
  92. Math

    A person standing near the edge of a cliff 120 feet above a lake throws a rock upward with an initial speed of 40 feet per second. The height of the rock above the lake at the bottom of the cliff is a function of time and is described by the function H(t)

    asked on July 16, 2011
  93. physics

    A 190 kg object and a 490 kg object are separated by 0.400 m. At what position (other than an infinitely remote one) can the 35.0 kg object be placed so as to experience a net force of zero? ------------ m from the 490 kg mass I do not understand how to

    asked on November 30, 2008
  94. Chemistry

    What is the solubility of CaF2 in a buffer solution containing 0.45M formic acid and 0.20M sodium formate? Given: Ka for formic acid=1.7x10^-4 Ka for hydrofluoric acid=6.8x10^-4 Ksp for CaF2=3.4x10^-11 Thank you so much. I don't have much idea on this.I

    asked on December 2, 2014
  95. Chemistry

    Hydrogen bonding is strongest between molecules of (1)H2S (2)H20 (3)H2Se (4)H2Te

    asked on December 2, 2010
  96. Algebra

    Find the y-intercept and the slope of the line -2x+6y=5

    asked on October 4, 2018
  97. A&P

    Assume that Na+ is being transported across a membrane via facilitated diffusion. Which of the following conditions would allow for the most transport of Na+ across that membrane. Answers: 1) a gradient of less than 5% difference between sides for the Na+

    asked on May 26, 2016
  98. math

    If the markup on an oven is 200% based on cost, what is the corresponding percent markup based on selling price? Round percents to the nearest tenth of a percent. Do not enter the percent symbol in your answer.

    asked on March 9, 2016

    A plane is steering at S83degreesE at an airspeed of 550 km/h. the wind is from N70degreesE at 85 km/h. Determine the ground velocity of plane to one decimal. Use the cosine and sine law.

    asked on October 24, 2014
  100. English

    In the word disinterestedly, the root morpheme is

    asked on February 11, 2014


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