Popular questions and responses by tina
  1. 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
  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
  3. maths

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

    asked on August 10, 2012
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. Chemistry

    You have 3.00 L of a 2.37 M solution of NaCl(aq) called solution A. You also have 2.00 L of a 2.00 M solution of AgNO3(aq) called solution B. You mix these solutions together, making solution C. Calculate the concentration (in M) of Na+ ions in solution C.

    asked on May 6, 2011
  10. 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
  11. Math

    There is a well that is 21 feet deep, in that well is a frog, every day it dumps up 3 feet and at night it falls back 2 feet,how many days will it take the frog to come out the well?

    asked on July 30, 2020
  12. 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
  13. 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
  14. 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
  15. 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
  16. Science - physics

    a jet airplane lands with a speed of 122 m/s and can accelerate uniformly at a max rate of - 6.2m/s2 as it comes to a rest. can this airplane land in 1.0 km runway

    asked on August 30, 2015
  17. 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
  18. political science

    When membership in an organization allows for a reductions in the price of museum tickets, it is called a a) purposive benefit b) bribe c) promotion offer d) material benefit e) solidary benefit

    asked on April 19, 2012
  19. 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
  20. calculus please help asap

    true or false questions: a)The derivatives of the reciprocal trigonometric functions can be found using the chain rule and their related base functions. b) A sinusoidal function can be differentiated only if the independent variable is measured in radians.

    asked on October 31, 2014
  21. Math

    Determine the slope of the line that passes through the points E(-1, 9) and F(2, -3)

    asked on May 23, 2012
  22. 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
  23. 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
  24. algebra

    Rewrite 13/25 and 11/20 so they have a common denominator.

    asked on October 1, 2018
  25. child growth developnent

    In detecting poor visual acuity in a neonate, you can safely blame the A. Neonate's light sensitivity B. fact that myscular coordination for focusing takes practice C. likekihood that the infant hasn't developed visual trscking ability D. fact that babies

    asked on June 10, 2010
  26. physics

    two different masses have equal, non zero kinetic energies. the momentum of the smaller mass is? what is the magnitude of momentum of a 0.140 baseball traveling at 45.0m/s? a 2.00g bullet hits and becomes embedded in 5.00 kg wood block which is hanging

    asked on February 25, 2009
  27. geometry

    a surveyor put stakes at the lettered points. He used string to determine lengths of line segments and a transit to check that the angles at D and B were both right angles. If CD = 3, CE = 5, DE = 4 and DB = 18, and:

    asked on May 18, 2019
  28. Math

    You are 40 years old and have a salary of $50,000 per year. When you retire at age 66, you want to have a salary that has the same buying power as the one you currently have. If you estimate that the inflation rate will be 1.25% per year, what will your

    asked on May 7, 2012
  29. Math

    A flooring company charges a homeowner a fixed labor charge of $V1 plus V2 per square foot of flooring. If the total bill was T, what is the equation to show how many square feet of flooring the homeowner required?

    asked on July 27, 2017
  30. 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
  31. 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
  32. 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
  33. Statisics

    35%of adult Americans are regular voters. A random sample of 250 adults in a medium-size college town were surveyed, and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence and comment on your

    asked on October 5, 2011
  34. 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
  35. Chemistry

    Which of the following is a correct statement about collision theory? A. All collisions lead to chemical reactions. B. Most collisions lead to chemical reactions. C. Very few reactions involve particle collisions. D. Effective collisions lead to chemical

    asked on May 20, 2018
  36. algebra

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

    asked on February 24, 2014
  37. chemistry

    Calculate the theoretical percentage of water in gypsum, rounded to the nearest whole number %. (calcium sulfate dihydrate; CaSO4 ° 2H2O; Ca = 40 g/mol, S= 32 g/mol; O= 16 g/mol; H= 1 g/mol).

    asked on February 6, 2013
  38. Chemistry

    How do you calculate the mass in kilograms of 3.99 liters of acetic acid. The density of this substance is 1.05 g/mL.

    asked on February 18, 2012
  39. 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
  40. 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
  41. 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
  42. algebra

    Wilma drove at an average speed of 60 mi/h from her home in City A to visit her sister in City B. She stayed in City B 20 hours, and on the trip back averaged 50 mi/h. She returned home 45 hours after leaving. How many miles is City A from City B

    asked on October 26, 2015
  43. 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
  44. 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
  45. 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
  46. 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
  47. 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


    asked on February 6, 2008
  49. 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
  50. 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
  51. maths

    1.two houses are bought for rupees 65000 each. the first is sold at a profit of 8% . if the average price received for each house is rupees 66300,find the gain or loss % on the second house. 2. a shopkeeper sells sugar in such a way that the selling price

    asked on June 26, 2013
  52. chemistry

    A doctor has ordered that a patient be given 11 of glucose, which is available in a concentration of 60.00 glucose/1000.0 of solution. What volume of solution should be given to the patient?

    asked on September 18, 2011
  53. chem

    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
  54. social studies

    what was the population of the united states in 1812

    asked on April 22, 2010
  55. grammar

    The patient is alert and oriented and has normal mental status exam. which are verbs? alert = v oriented = v is = v

    asked on July 5, 2009
  56. Early Childhood Education

    Investigating the bugs the two children found on the playground and finding books to identify them instead of doing your scheduled science lesson for the day is an example of: integrated learning or relevant learning Would this be an example of relevant

    asked on January 12, 2007
  57. Physics

    A beaker of water placed on a scale produces a reading of 0.910kg. An object of mass 0.27kg and volume 9.40 x 10^-5m^3 is lowered into the water by a string. By how much will the reading on scale change?

    asked on May 24, 2017
  58. 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
  59. 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
  60. math

    6x-2y+1=0 and 3x-5y+7=0 How do I substitute this?

    asked on September 23, 2015
  61. math

    If a car travels 340 miles on 20 gallons of gas, how far can it travel on 25 gallons of gas? A.255 B.272 C.425 D.500 would the answer be C

    asked on July 8, 2015
  62. biology

    during the downpour in a village,the rainwater carried away excess of nitrogenous and other compounds present in the soil to a pond.how will they affect the growth of algae and phyloplankton in the pond?

    asked on August 14, 2014
  63. physics

    In an archery practise an arrow was released from the bow with a velocity 20m/s.it strikes to the board situated 15m ahead and stops.find at what rate the arrow was accelerated?

    asked on August 14, 2014

    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
  65. physics

    an auto, moving too fast on a horizontal stretch of mountain road, slides off the road, falling into deep snow 43.9 meters below the road and 87.7 meters beyond the edge of the road. a. How long did the auto take to fall? b. How fast was it going when it

    asked on December 12, 2013
  66. 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
  67. 6th grade math

    Cameron is making bead necklaces. Hehas 90 green beads Nd 108 blue beads. what is the greatest number of identical necklace es he can make if he wants to use all the beads

    asked on August 8, 2012
  68. political science

    A _______________ is the best example of an informational benefit provided by many interest groups. a) travel discount b) free T-shirt c) health insurance program d) newsletter e) consciousness-raising workshop

    asked on April 19, 2012
  69. 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
  70. 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
  71. 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
  72. Business

    Which of the following is NOT an example of parallel structure? "Yoga can help you develop flexibility, reduce stress, and increase relaxation." "Learn how to analyze business audiences, improve your style, and edit thoroughly." "You are all encouraged to

    asked on February 2, 2011
  73. Chemisty

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

    asked on November 17, 2010
  74. physics

    as a hiker descends a hill, the work done by gravity on the hiker is a.) positive and depends on the path taken b.) negative and depends on the path taken c) positive and indepedent of the path taken d.)negative and independent of the path taken

    asked on October 11, 2010
  75. line segments,lines and rays

    how you draw a label line segment

    asked on September 13, 2010
  76. geometry

    Draw and mark a figure in which M is the midpoint of ST, SP = PT, and T is the midpoint of PQ.

    asked on September 1, 2010
  77. algebra

    Which of the following best describe the graph of a quadratic equation with one real root? A: It has 2 x-intercepts B: It does not cross the x-axis C: Its vertex lies on the x-axis D: Its vertex lies on the y-axis

    asked on August 16, 2010
  78. 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
  79. grammar

    Identify ALL nouns and pronouns in the following sentence. An = not a noun or pronoun evaluation = noun with = not a noun or pronoun Maddox = noun rod = noun was = not a noun or pronoun consistent = not a noun or pronoun with = not a noun or crossed = not

    asked on July 5, 2009
  80. chemistry

    for the reaction: 4NH3+5O2=4NO+6H2O; 15.0g of NH3 and 27.5g of O2 were reacted. a). which is the limiting reactant? b).how many moles of NO are formed from the limiting reactant in the above reaction. i know how to do the moles but i couldn't figure out

    asked on March 7, 2008
  81. physics#36

    Can an efficient transformer step up energy? Defend your answer.

    asked on February 14, 2008
  82. 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
  83. mth/208

    solve d=abc for a. a=d/bc

    asked on November 11, 2016
  84. math

    in city high school,the marching band has 48 members and the orchestra has 36 member.if there are only 12 students who belong to only one group and all students belong to at least one group how many students belong to both group?

    asked on June 24, 2016
  85. English

    Is the following sentence correct? if if the pronoun is incorrect underline the pronoun error and write the correct pronoun. In the morning, my brother Kele is usually more alert than me.

    asked on February 4, 2015
  86. 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
  87. Chemistry

    under standard conditions, the following reaction is spontaneous at 298K. O2 + 4H+ + 4Br- --> 2H2O + 2 Br2 Will the reaction be spontaneous if the PH value is adjusted using a buffer composed of 0.10 M benzoic acid and 0.12M sodium benzoate? Given:Given:

    asked on December 2, 2014
  88. 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
  89. math calculus

    if i,j,k are the standard unit basic vectors, in 3 space, determine the value of k dot(j-3k)+(i-4k) dot (i-4k)-8 |i cross -k| (Simplify without using components)

    asked on November 24, 2014

    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
  91. Please Help asap for math

    Given the following: vector u= [-2,-1,2] and vector v=[1,-1,-4] and vector w= [4,3,-2] find: a)theta, the angle between vectors, u and w. b)Are the vectors, u, v, and w coplanar?Show your answer algebraically.

    asked on October 24, 2014
  92. computer literacy

    Digital literacy is a skill that important for

    asked on October 20, 2014
  93. chemistry

    Can you make a 2 carbon molecule of Ketone?

    asked on October 9, 2014
  94. math

    31. Solve the equation by completing the square. Round to the nearest hundredth if necessary. x2 – 6x = –8

    asked on May 23, 2014
  95. English

    Which group of words is the complete infinitive phrase in this sentence,it is important to avoid harmful exposure to the suns direct rays

    asked on March 6, 2014
  96. Science

    Which of the following would not be affected by a loss of vacuole function? The export of unwanted substances The production of ATP>>>>>>? The regulation of cellular pH The storage of food materials

    asked on January 11, 2014
  97. Math Probability

    A certain state's lottery game, LOTTO, is set up so that each player pays $1 per ticket and chooses six different numbers between 1 and 20 inclusive.(the order doesn't matter) If the six numbers chosen match the six numbers drawn, the player wins the grand

    asked on December 1, 2013
  98. Career question

    how long does it take to become a pediatrician?

    asked on September 8, 2013
  99. english grammar

    write an essay on the the topic- government has granted a large amount of money to your school to construct a hobby room and buy instruments for your school orchestra. why would you like to have the two in your school.

    asked on June 27, 2013
  100. Instructional materials, their preparation and use

    Which of the following can we consider to be truly audiovisual?

    asked on June 17, 2013


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