Marcus

Popular questions and responses by Marcus
  1. Chemistry

    Which of the following solutes in aqueous solution would be expected to exhibit the smallest freezing-point lowering (assuming ideal behavior? 0.1 m NaCl .2 m CH3COOH .05 m Al2(SO4)3 .1 m MgCl2 .25 m NH3 What would be the steps to picking the right option?

    asked on February 19, 2013
  2. chemistry

    When 50.0mL of 1.20 M of HCl (aq)is combined with 50.0mL of 1.30 M of NaOH (aq) in a coffee-cup calorimeter, the temperature of the solution increases by 8.01 Degrees C. What is the change in enthalpy for this balanced reaction? HCl(aq) + NaOH(aq)

    asked on November 14, 2012
  3. geometry

    DEFG is an isosceles trapezoid. Find the measure of

    asked on October 20, 2011
  4. chemistry

    At constant pressure and 25 degrees C, what is delta H for the reaction 2C2H6(g) + 7O2(g) --yields-- 4CO2(g) + H2O(l) if the complete consumption of 11.3 g of C2H6 releases -586.3 kJ of heat energy? (11.3=.38 mol C2H6)

    asked on November 14, 2012
  5. calculus

    how to differentiate (x^3) - 2 using [f(x+h)-f(x)]/h

    asked on July 10, 2020
  6. Chemistry

    When 1.150 grams of an unknown nonelectrolyte dissolves in 10.0 grams of water, the solution freezes at -2.16°C. What is the molecular weight of the unknown compound? Kf for water = 1.86°C/m. -2.16 x m/-1.86 = 1.16 1.16/ .010 kg of water= 116 1.150/116=

    asked on February 10, 2013
  7. Chemistry

    The decomposition of ozone may occur through the two-step mechanism shown below: step 1 O3 ----> O2 + O step 2 O3 + O ---> 2O2 The oxygen atom is considered to be: a catalyst or reaction intermediate? How am I supposed to be able to tell the difference

    asked on February 19, 2013
  8. Chemistry

    In a given 1st order reaction A ---> products, the initial concentration of A is 0.40 M. What will be the concentration of A after 15 seconds if the half-life of the reaction is 3 seconds? I found the concentration to be 1.25 x 10-2 M But then how do I

    asked on February 18, 2013
  9. Chemistry

    A solution contains 10.0 g pentane, C5H12, 10.0 g hexane, C6H14 and 10.0 g benzene, C6H6. What is the mole fraction of hexane? I figured the equation would be: ___ M Hexane x 10 Divided by 30 =Mole fraction of Hexane?

    asked on February 10, 2013
  10. chemistry

    A 94.7 g sample of silver (s= 0.237 J/(g x Degree C)), initially at 348.25 Degrees C , is added to an insulated vessel containing 143.6 g of water (s=4.18 J/(g x Degree C)), initially at 13.97 Degrees C. At equilibrium, the finial temperature of the

    asked on November 14, 2012
  11. chemistry

    A sample of propane C3H8 contains 13.5 moles of carbon atoms how many total moles of atoms does the sample contain?

    asked on March 1, 2013
  12. Chemistry

    The question is: what is the ratio [NH3/[NH4+] in an ammonia/ammonium chloride buffer solution with pH= 10.00? (pKa for ammonia=9.25) When working the problem, I tried to solve it a bit backwards, in that I plugged in each of the multiple choices I was

    asked on April 9, 2013
  13. Chemistry

    What is the pH of a 0.1 M NaOCl solution (Ka of HOCl is 2.95 x10-8) I did: x squared/.10= 2.95x10-8 x squared= 2.95x10-9 x= 5.43x10-5 -log(5.43x10-5)= 4.27 pH However, the options I'm given are either a.) 3.74 b.) 6.47 c.) 8.23 d.) 10.27 What steps am I

    asked on April 8, 2013
  14. Math

    An object is thrown upward from the top of a 160-foot building with an initial velocity of 144 feet per second. The height, h, of the object after t seconds is given by the equation h=-16t^2+144t+160. When will the object hit the ground? The object will

    asked on December 3, 2017
  15. Chemistry

    Which of the following pure liquids is the best solvent for sodium fluoride? CCl4 C2C6 HCl BCl3 or PCl5 My guess would be either CCl4 or C2C6, I need to know the reasoning behind the correct answer.

    asked on February 19, 2013
  16. chemistry

    consider the following changes at constant temperature & pressure H2O(s) --yields-- H20(l); Delta H1 H2O(l) --yields-- H2O(g); Delta H2 H2O(g) --yields-- H2O(s); Delta H3 Using Hess's law, the sum of the deltas is a. equal to 0 b. sometimes greater than

    asked on November 14, 2012
  17. computer science

    write a program that asks the user to enter today's sales rounded to the nearest $100 for each of three stores. the program should then display a bar graph comparing each store's sales. create each bar in the graph by displaying a row of astericks. each

    asked on April 5, 2010
  18. Science

    How would you compare infrared radiation absorption and emission rates for an object at constant temperature? Thank you :)

    asked on October 26, 2019
  19. Math

    A ladder is leaning against a building so that the distance from the ground to the top of the ladder is 4 feet less than the length of the ladder. Find the length of the ladder if the distance from the bottom of the ladder to the building is 8 feet.

    asked on December 3, 2017
  20. chemsitry

    home / study / questions and answers / science / chemistry / make sure to answer both parts: 1)balance the following ... Your question has been posted. We'll notify you when a Chegg Expert has answered. Post another question. . Question Edit question make

    asked on September 29, 2015
  21. chemistry

    50.0 mL of a solution of HCl is combined with 100.0 mL of 1.15 M NaOH in a calorimeter. The reaction mixture is initially at 22.4°C and the final temperature after reaction is 31.2°C. What is the molarity of the HCl solution? You may assume that there is

    asked on February 28, 2015
  22. Math

    Doris invested some money at 7% and some money at 8%. She did at 7%. Her yearly total from the two investments was $7.80. How much did Doris invest at each rate?

    asked on July 1, 2014
  23. Physics

    You pull a sled across a horizontal frictionless patch of snow. If your pulling force is in the same direction as the sled's displacement and increases the kinetic energy of the sled by 34%, by what percentage would the sled's kinetic energy increase if

    asked on March 21, 2014
  24. Chemistry

    The molal boiling-point constant for water is 0.51 degrees C/molal. The boiling point of a 1.00 molal solution of Ca(NO3)2 should be increased by: A.) exactly 1.53 or B.) Somewhat less than 1.53 This is how I worked the problem: Ca(NO3)2 dislocates into 3

    asked on February 21, 2013
  25. Math

    You have 2/3 bag of flour. Use 3/4 of the flour to make cookie dough. How much of the entire bag do you use to make cookie dough?

    asked on December 17, 2012
  26. math

    Levinson’s Hardware has a number of bikes and tricycles for sale. There are 27 seats and 60 wheels all told. Determine how many bikes and tricycles there are in the store

    asked on June 1, 2012
  27. algebra 1

    Natalie made a mistake in the following problem. What line was the mistake made in? Show your work and give the correct answer. Line 1 6(4) ÷ 2 − 1 + 5 Line 2 6(4) ÷ 1 + 5 Line 3 24 ÷ 1 + 5 Line 4 24 + 5 Line 5 29

    asked on December 22, 2010
  28. calculus

    find dy/dx of xsiny+cos2y=cosy

    asked on December 8, 2008
  29. Geometry

    Two similar rectangular prisms have a scale factor of 4:1. The smaller prism has a volume of 6 cubic centimeters. What is the volume of the larger prism in cubic centimeters?

    asked on May 28, 2019
  30. History

    how did people react to the great depression

    asked on May 4, 2018
  31. Science

    Electrical energy is required to decompose water into hydrogen and oxygen. True or False

    asked on January 29, 2018
  32. math

    Billions of dollars have been raised to help in the fight against malaria. The following table shows the value of some of the donations: What is the average of the values listed in the table?

    asked on January 29, 2018
  33. science

    What happen to the water in the basin when you placed a drop of water?

    asked on December 7, 2017
  34. physics

    Three forces A (30N at 35 degrees NE), B (40N at 25 degrees SW) and C (50N at SE) all act on one original point. Find the magnitude and direction measured from the positive x-axis of a fourth force F required to keep the body in equilibrium.

    asked on November 7, 2017
  35. algebra 2

    what is the domain in interval notation when the restrictions are x cannot = 2 and x cannot = -2? I got (-infinity, 2) U (2,-infinity) (-infinity, -2) U (-2, infinity) but my math teacher marked this as wrong

    asked on October 12, 2015
  36. English Grammar

    Which sentence uses proper grammar? I'm bored by math class. Or I'm bored of math class.

    asked on November 7, 2013
  37. Chemistry

    Many portable gas heaters and grills use propane, C3H8(g). Using enthalpies of formation, calculate the quantity of heat produced when 15.0g of propane is completely combusted in air under standard conditions. Assume that liquid water is forming.

    asked on October 4, 2013
  38. Chemistry

    First, the question I'm given is: What is the pH of a 1.0 L solution containing 0.25M acetic acid and 0.75M sodium acetate ( Ka for acetic acid= 1.8x 10-5) So I took the -log(1.8x10-5)= 4.74+log(.75/.25)= 5.22 pH But then I'm asked if .050 mol NaOH is

    asked on April 8, 2013
  39. Chemistry

    The indicator bromocresol green (HIn) can be in two different forms: As HIn the color of the indicator is yellow, an In the color of the indicator is blue, and an equilmolar mixture of the two species is green. The Ka of the indicator is 2.5 x 10-5. What

    asked on April 7, 2013
  40. physics

    A proton is put on the positive Y axis a large distance (100km) from the origin. What is the minimum speed required in the - Y direction so the proton will just reach the point (0,20) cm?

    asked on March 3, 2013
  41. Chemistry

    In a given 1st order reaction A ---> products, the initial concentration of A is 0.40 M. What will be the concentration of A after 15 seconds if the half-life of the reaction is 3 seconds?

    asked on February 17, 2013
  42. Chemistry

    What is the molality of an aqueous solution that is 10.0% ethanol, C2H5OH, by mass?

    asked on February 10, 2013
  43. chemistry

    My chem book gives me the following Hess' Law example: Mg + 2HCl --> H2 MgCl2 Delta H1 MgO +2HCl --> H2O +MgCl2 Delta H2 H2 + 1/2 O2 --> H2O Delta H3=-68.3kcal The desired reaction is the formation reaction of MgO as follows: MgS +1/2 O2 --> MgO Delta H

    asked on December 6, 2012
  44. physics

    A weightlifter has a basal metabolic rate of 80.0 W. As he is working out, his metabolic rate increases by about 650 W. (a) How many hours does it take him to work off a 450-Calorie bagel if he stays in bed all day? (b) How long does it take him if he’s

    asked on November 28, 2012
  45. Art

    If a painter paints 8 different pictures to get a better perspective and then only selects 1 picture to illustrate her mood: what would this be called?

    asked on October 9, 2012
  46. consumer math

    2. Use the monthly payment table and this table to answer the following questions. Loan APR Years Monthly Payment Total Payment Interest $6,700 13.5% 5 A B C $8,720 12.5% 15 D E F $20,230 11.5% 20 G H I Find A. (Points : 1) 3. Find B. (Points : 1) 4. Find

    asked on February 28, 2012
  47. advanced math 6th grade

    how many positive integral factors does the number 36 have? I don't understand what that means or how to find the answer.

    asked on November 17, 2010
  48. statistics

    the amount of time spent in North American adults watching television per day is normal distributed with a mean of 6 hours and a standard deviation of 1.5 hours

    asked on September 6, 2010
  49. Math: Geometry

    The circumference of the base of a cylinder is 16 cm. The height of the cylinder is 10cm. a. What is the surface area of the cylinder? b. What is the volume of the cylinder? Need help on this one. I have the formula but I'm a little confused because I

    asked on February 21, 2008
  50. social studies

    Identify one or two early signs of conflict in the colonies

    asked on January 4, 2020
  51. Math

    pls HELP Eric owns and operates the Hot Ham food truck. The expression 3.25b+2h gives the cost of b burgers and h hot dogs. What is the cost of 4 burgers and 6 hot dogs?

    asked on November 10, 2019
  52. social studies

    Which sentence BEST describes the role of mercantilism in the growth of transatlantic trade during the 1600s? European countries cooperated in the shipment and exchange of goods. English settlements hoped to encourage commerce among the colonies. Colonies

    asked on September 11, 2019
  53. earth science

    Please help ASAP I'm stuck!!! create an imaginary example of finding a given amount of Lokium and DOL in a rock, and then determining the absolute age of that rock. Assume that each trial represents 1,000 years.

    asked on August 13, 2019
  54. Trigonometry

    While cruising at a steady speed of 400 km/h, you identify a storm cloud straight ahead 45 km away. To avoid turbulence, you start climbing at an angle of elevation of 15°. If you maintain this speed and direction for 6 min, how far will you be from the

    asked on June 13, 2019
  55. Math

    Ben throws a ball vertically upward from the top of a cliff. The height of the ball above the base is approximated by the model h = -5t² - 5t + 100, where h is the height in metres and t is the time in seconds. a) After how many seconds does the ball hit

    asked on May 7, 2019
  56. math

    I need help asap A solid with two parallel and congruent bases cannot be which of the following. A. cone B. prism C. cylinder D. cube My answer is cube

    asked on March 23, 2019
  57. English

    Why are the fairies singing a lullaby? A. to put their queen to sleep B. to put their babies to sleep C. to put the bird to sleep D. to show how well they sing I think the answer is B. Pls help

    asked on March 6, 2019
  58. Language arts

    Use the excerpt to answer the question 1. Which is the best paraphrase of the lines from the poem A. We are happy when the sun is shining we feel Mary when the bells ring and we sing along the sun goes down and we have to stop playing sports. B. The sun

    asked on February 12, 2019
  59. Civics

    In 2002, one U.S. dollar could be exchanged for 133 Japanese yen, and in 2011, a U.S. dollar was worth 77 yen. Based on this information, which statement is true? Demand for the yen increased between 2002 and 2011, and demand for U.S. the dollar decreased.

    asked on October 4, 2018
  60. Calculus -- STOP NOW!

    Consider the functions A(x, y) = x^2y + xy − 3xy^2, and B(x, y) = xe^xy − y (a) Calculate the x derivative of A, or Ax. (b) Calculate the y derivative of A, or Ay. (c) Calculate the x derivative of B, or Bx. (d) Calculate the y derivative of B, or By.

    asked on April 2, 2018
  61. physics

    Two stationary point charges of +61.0µC and +0.48µC exert a repulsive force on each other of 172N. What is the distance between the two charges?

    asked on February 21, 2018
  62. physics

    1) A balloon rubbed against denim gains a charge of -8.45µC. What is the electric force between the balloon and the denim when the two are separated by a distance of 4.7cm? (Assume the charges are located at a point) 2)Two identical conducting spheres are

    asked on February 21, 2018
  63. physics

    A balloon rubbed against denim gains a charge of -8.45µC. What is the electric force between the balloon and the denim when the two are separated by a distance of 4.7cm? (Assume the charges are located at a point)

    asked on February 21, 2018
  64. Reading

    Can some help me do a thesis on National Committee for a SANE Nuclear Policy?

    asked on February 14, 2018
  65. Reading

    How can I find Indirect and Direct characterization about Ponyboy in the Outsiders?

    asked on February 13, 2018
  66. Science

    Which of the following does NOT happen when vinegar and baking soda react? true or False?

    asked on January 29, 2018
  67. Reading

    Who was Reinhard Heydrich and what did he do?

    asked on January 28, 2018
  68. Reading

    Can any give a brief description of these: What was the Kristallnacht? What was like in the ghettos? What was like to lose faith during being in the camps? What was like in the transports?

    asked on January 28, 2018
  69. HELP HELp

    What can I do to successfully complete a selective Enrollment test? I haven't studied and the test tomorrow.

    asked on January 26, 2018
  70. Reading

    I have a journal that I have to do called "Life in Camps", it's about the holocaust. Why can I write in the journal?

    asked on January 25, 2018
  71. math

    Hello i have a question.i tried it but i did not understand it. heres my question how can you describe the relative positions of p and q in the following situations? a,m(p.q)=0 b.m(p,q)0 d.m(p,q)does not exist

    asked on November 19, 2017
  72. math

    Hello i have a question.i tried it but i did not understand it. heres my question how can you describe the relative positions of p and q in the following situations? a,m(p.q)=0 b.m(p,q)0 d.m(p,q)does not exist

    asked on November 19, 2017
  73. Math

    Simplify the following expression. Write the result using positive exponents. (-2xy^-3)^-5 / (xy^-1)^-1

    asked on November 4, 2017
  74. math

    book which costs $12. He has saved one third of the amount he needs. How much money does he still need to save?

    asked on March 13, 2017
  75. Fractions

    (4y^-3/5x^-4)^2

    asked on March 9, 2017
  76. Math

    robby runs for 5 minutes. He walks for 10 minutes. He runs for 7 minutes. He walks another 4 minutes. He runs again for 8 minutes and walks again for 3 minutes. what is the range of minutes robby runs?

    asked on September 20, 2016
  77. Math

    How to draw tow different parallelograms that each have an area of 4 square inches

    asked on May 12, 2016
  78. statistics

    Suppose babies born in a large Hospital have a mean weight of 4088 in a variance of 5569. if 128 babies are sample that a random from the hospital what is the probability that the mean weight of the sample babies would differ from the population mean by

    asked on March 17, 2016
  79. Math

    What is 17% of 200? .17 x 200 = 34 What is the number 200 increased by 17%? 200 x 1.17 = 234 What is the number 200 decreased by 17%? The only way I knew to do this is based on the first question - since that answer was 34, I subtracted 34 from 200 and the

    asked on January 16, 2016
  80. Physics

    A projectile with a mass of 2.50 kg is shot horizontally from a height of 15.0 m above a flat surface. The projectile's initial speed is 22 m/s. 1.How much mechanical energy does the projectile have initially ? 2.How much work is done on the projectile by

    asked on December 13, 2015
  81. Math

    I am the product of 135 and decreased by 500. who am I?

    asked on November 25, 2015
  82. Physics addition of velocities

    A seagull flies at a velocity of 7.00 m/s straight into the wind. (a) If it takes the bird 17.0 min to travel 6.00 km relative to the earth, what is the velocity of the wind? (b) If the bird turns around and flies with the wind, how long will he take to

    asked on October 1, 2015
  83. Physics Projectile Motion

    A projectile is launched at ground level with an initial speed of 51.5 m/s at an angle of 35.0° above the horizontal. It strikes a target above the ground 2.50 seconds later. What are the x and y distances from where the projectile was launched to where

    asked on September 29, 2015
  84. English

    What is the difference between modern fantasy and regular fantasy. Is modern fantasy merely a subgroup of fantasy? Some examples would help.

    asked on April 19, 2015
  85. english

    Researchers are LEAST likely to want to know which of the following from their sources?

    asked on March 14, 2015
  86. English

    What are the values (negative) being taught in this advertisement? The advertisement is trying to sell a military style watch. In the advertisement there are two armed soldiers in the background and appear to be situated in a war zone area. I am able to

    asked on March 1, 2015
  87. english

    What are the values (negative) being taught in this advertisement? The advertisement is trying to sell a military style watch. In the advertisement there are two armed soldiers in the background and appear to be situated in a war zone area. I am able to

    asked on March 1, 2015
  88. physics 105

    How many cubic feet will 44lb of CO2 occupy at STP

    asked on February 9, 2015
  89. HEALTH

    Phonology refers to the science which treats

    asked on December 17, 2014
  90. HEALTH

    Phonology refers to the science which treats A. blood disorders. B. vocal sounds. C. heart rhythms. D. nutritional deficiencies.

    asked on December 17, 2014
  91. Cardiovascular Respirtory

    A patient complains of a fast heart rate. Which diagnosis does this statement indicate? A. Arrhythmia B. Infarct C. Ischemia D. Tachycardia

    asked on December 17, 2014
  92. Cardiovascular Respirtory

    Which suffix would be used in a term pertaining to a meal? A. -EMESIS B. -RRHEA C. -TRIPSY D. -PRANDIAL

    asked on December 17, 2014
  93. Cardiovascular Respirtory

    When referring to a distended blood vessel, a doctor may use the term A. ascites. B. varicose. C. globulin. D. syncope.

    asked on December 17, 2014
  94. Cardiovascular Respirtory

    Which of the following structures are tubes? A. Cilia, adenoids, mucous, epiglottis B. Apex, base, hilum C. Frontal, maxillary, sphenoidal, ethmoidal D. Eustachian, pharynx, bronchi

    asked on December 17, 2014
  95. chemistery lab..urgent

    hi..can someone hwlp me out here on how we can calculate the moles of H2T(phthalic acid)?? its urgent for my lab this evening 1:00pm friday

    asked on September 18, 2014
  96. chemistry

    state the chemical formula of phthalic acid and calculate the molar mass using the formula.

    asked on September 18, 2014
  97. chemistry

    Sodium metal is immersed into graduated cylinder that holds exactly 32.5 ml. The sodium metal used to fill the cylinder weighs 405.5 grams. Calculate the density of sodium based on the given data.

    asked on July 27, 2014
  98. calculating statistical data

    last month, the release of information specialist received 232 requests for information. he was able to answer 176 within the specified time frame of five working days. what is the rate of compliance in the answering requests within the specified time

    asked on July 23, 2014
  99. calculating statistical data

    all the patients who present to the emergency service department with a suspected acute myocardial infraction (AMI) are expected to receive an EKG within 10 minutes if their arrival. of the 56 patients who had a suspected AMI during the last quarter, 32

    asked on July 23, 2014
  100. calculating statistical data

    what is the percent of variance for each item listed in the him department budget shown in the table below? round to two decimal points.

    asked on July 23, 2014

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