Popular questions and responses by chelsea
  1. Chemistry

    For the following, 2HBr (aq) + Ba(OH)2 (aq) ---> 2H2O (l) + BaBr2 (aq) write the net ionic equation including the phases

    asked on October 4, 2013
  2. Chemistry

    For the following chemical reaction... HCN (aq) + KOH (aq)----> H2O (l) + KCN (aq) write the net ionic equation, including the phases

    asked on October 4, 2013
  3. math

    Sides $\overline{AB}$ and $\overline{EF}$ of regular hexagon $ABCDEF$ are extended to meet at point $P$. What is the degree measure of angle $P$?

    asked on March 4, 2020
  4. science

    A boy and his skateboard have a combined mass of 64 kg. If he is moving with a speed of 3.2 m/s, and collides with a stationary skateboarder whose mass (including his skateboard) is 96 kg, with what speed will the two skateboarders move immediately after

    asked on February 9, 2013
  5. Chemistry

    You purchased a 5.00 pound bag of sugar (sucrose, C12H22O11) at the grocery last week to bake cookies. Conversion: 1 pound = 1 lb = 454 grams. a.How many grams of sucrose did you purchase? 454 grams (g) = 1 pound (lb) 454 g * 5 = 2270 g A 5 pound bag of

    asked on September 23, 2015
  6. Chemistry

    H(f) Cl= 121.3 kj H(f) C= 716.7 H(f) CCl4= -95.7 calculate the average molar bond enthalpy of the carbon-chlorine bond in a CCl4 molecule. I have tried to figure it out and keep getting the wrong answer. Please help!

    asked on November 25, 2013
  7. chemistry

    If you add 5.0 mL of 0.50 M NaOH solution to 20.0 mL to Buffer C, what is the change in pH of the buffer? (where buffer C is 8.203 g sodium acetate with 100.0 mL of 1.0 M acetic acid) I have calculated the pH of buffer C to be 4.74. Now what? =\

    asked on November 7, 2010
  8. .....

    what is the possessive noun in "the purses of the ladies"

    asked on February 14, 2011
  9. chemsitry help again please

    Write the formula of the conjugate base for acid HClO2 .

    asked on November 19, 2013
  10. chemistry

    Assuming equal concentration rank these by freezing points, Na3PO4, Li2Co3,NH4Cl, and Sn(NO3)4

    asked on January 27, 2013
  11. math

    how many 2 card hands are possible with a 26 card deck?

    asked on March 6, 2012
  12. chemistry

    will the following solutions be acidic, neutral, or basic? Write the net ionic equation for any reaction that takes place. NH4Cl, KHCO3, LiClO4, NH4NO3, H2CO3, LiClO2, Ba(NO3)2

    asked on July 18, 2011
  13. Physics

    A photon has a frequency of 7.3 × 10–17 Hz. Planck’s constant is 6.63 × 10–34 J•s. The energy of the photon, to the nearest tenths place, is × 10–50 J.

    asked on May 11, 2016
  14. maths

    a light house flashes every 56 seconds. Another lighthouse flashes every 40 seconds. At 9 p.m. they both flash t the same time. What time will it e when they next both flash at the same time?

    asked on September 26, 2010
  15. Chemistry

    Write the balanced neutralization reaction between H2SO4 and KOH in aq. solution. .350 L of .410 M H2SO4 is mixed with .300 L of .230 M KOH. What concentration of sulfuric acid remains after neutralization? ______ M H2SO4

    asked on October 4, 2013
  16. Org. Chem.

    Is malonic acid polar or nonpolar? and does it hydrogen bond with water? with methyl alcohol? with hexane? I keep getting different results and would like some help please with explanation.

    asked on September 14, 2009
  17. stats

    A particular normal distribution has mean of 575 and standard deviation of 150. What X values form the boundaries for the middle 60% of the data? Round answers to two decimal places. Lower boundary: Blank 1 Upper Boundary: Blank 2

    asked on February 21, 2016
  18. physics

    an airplane is flying in a horizontal circle at a speed of 430 km/h if its wings are tilted 40 degrees to the horizontal what is the radius of the circle in which the plane is flying? assume that the required force is provided entirely by an "aerodynamic

    asked on May 27, 2009
  19. Chemistry

    A student produced a volatile liquid experiment with the following results: Mass of flask, boiling water, foil cap, and unkown after cooling, g: 83.350 Mass of flask, boiling stone, and foil cap, g: 82.657 Water bath temperature: 95*C Barometric pressure:

    asked on October 27, 2011
  20. Chemistry

    NaHCO3 (s) + HC2H3O2 (aq) ---> ?

    asked on October 4, 2013
  21. Math (Area of Shapes)

    Suppose that when pizza dough is rolled out it costs 25 cents per square foot, and that sauce and cheese when spread out on a pizza have a combined cost of 60 cents per square foot. Let's say sauce and cheese are always spread out to within 1 inch of the

    asked on October 28, 2012
  22. Calculus

    Find expressions for the quadratic functions whose graphs are shown. One graph has the point (4,2) plotted in which the parabola passes through (U-shaped parabola- right side up) The vertex is at (3,0) and the parabola does not touch the y-axis for as much

    asked on September 21, 2010
  23. chemistry

    Outline a separation scheme for isolating pure isopentyl acetate from the reaction mixture. ( post lab question for the Banana oil lab)

    asked on July 9, 2013
  24. chemistry

    molecular and net ionic equations for FeCl3 + Na2S

    asked on June 21, 2011
  25. URGENT math rate of change

    What is the horizontal change between the points (-2, 5) and (4, 10)?

    asked on June 8, 2011
  26. Calc

    The monthly cost of driving a car depends on the number of miles driven. Lynn found that in May it cost her $380 to drive 480 mi. and in June it cost her $460 to drive 800 mi. a) Express the montly cost C as a function of the distance driven d, assuming

    asked on September 20, 2010
  27. Physics -Relativity

    Question: If a muon is traveling at 70% of the speed of light, how long does it take to decay in the observer's rest frame (i.e., what is the observed lifetime of the muon)? Answer: =??? us

    asked on April 16, 2008
  28. algebra

    Given the parent function of f(x) = x3, what is the value of h in the translated graph of f(x − h) + k?

    asked on December 13, 2016

    What mass of PCl3 forms in the reaction of 70.6 g P4 with 268 g Cl2 ? P4 + 6Cl2 → 4PCl3

    asked on February 6, 2015
  30. Chemistry 22

    Table salt NaCl and sugar C12H22O11 are accidentally mixed. A 6.00 g sample is burned and 2.90 g of CO2 is produced. What was the mass percentage of the table salt mixture? Could you please show me all the way through if you can?

    asked on October 5, 2013
  31. Math 9th grade slopes

    A line connecting (5, 6) to another point has an undefined slope. What is the closest point on this line with whole number coordinates below (5, 6)?

    asked on May 27, 2011
  32. Physics

    Light containing two different wavelengths passes through a diffraction grating with 1300 slits/cm. On a screen 16.0 cm from the grating, the third-order maximum of the shorter wavelength falls midway between the central maximum and the first side maximum

    asked on April 14, 2011
  33. College Physics

    A particle experiences a constant acceleration that is north at 100 m/s^2. At t=0, its velocity vector is 60 m/s east. At what time will the magnitude of the velocity be 100 m/s?

    asked on September 13, 2010
  34. chemistry

    How many grams (of mass m) of glucose are in 355mL of a 5.50% (m/v) glucose solution?

    asked on November 4, 2013
  35. Chemistry #30

    A sample of Br2(g) takes 10.0 min to effuse through a membrane. How long would it take the same number of moles of Ar(g) to effuse through the same membrane?

    asked on October 13, 2013
  36. physics

    A criminal is escaping across a rooftop and runs off the roof horizontally at a speed of 5.1 m/s, hoping to land on the roof of an adjacent building. Air resistance is negligible. The horizontal distance between the two buildings is D, and the roof of the

    asked on January 31, 2012
  37. English

    Are there any metaphors in the poem Young by Anne Sexton? If so, what are the metaphors?

    asked on November 17, 2011
  38. math rate of change

    What is the vertical change between the points (100, 5) and (1000, 5)?

    asked on June 8, 2011
  39. Calc.

    Use a linear approximation (or differentials) to estimate the given number. Tan 44 degrees Please help.

    asked on November 15, 2010
  40. Science

    1. Which statement about subatomic particles is NOT true? (1 point) Protons and neutrons have almost the same mass. Protons and electrons have opposite charges. Unlike protons and electrons, neutrons have no charge. Protons and neutrons have the same

    asked on October 10, 2008
  41. Chemistry

    Part 1: Find the % by mass of each element in camphor (C10H20O). Step 1: Find the atomic mass of each element in the molecule. Atomic Mass of C: 12.0107 Atomic Mass of H: 1.00794 Atomic Mass of O: 15.9994 Step 2: Find the mass combination of each element.

    asked on September 21, 2015
  42. Chemistry #25

    Calculate the average translational kinetic energy (sometimes just called average kinetic energy)...for one mole of gas at 381 K.

    asked on October 13, 2013
  43. Chemistry

    Write the balanced equation for (aq) Pb(ClO3)2 and (aq) NaI. Include phases. What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with .250 L of .110 M NaI? Assume the reaction goes to completion.

    asked on October 4, 2013
  44. Math

    How much mulch will you need to cover a rectangular garden that is 20 feet by 30 feet with a 3 inch layer of mulch? Explain.

    asked on October 20, 2012
  45. physics

    Review Conceptual Example 7 before starting this problem. A uniform plank of length 5.0 m and weight 225 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who

    asked on May 23, 2012
  46. Math

    Solve the inequality by first rewriting it as an equivalent inequality without absolute value bars. Express solution set using interval notation. | x+3 | +8 is less than or equal to 14 Thanks so much for helping me!

    asked on February 1, 2012
  47. MATH-direct variation

    Which of the following represents a direct variation function? The answer coices are A)d=2r B)y=9x+1 C)y=-3 D)a=1/2h(b1+b2)

    asked on June 10, 2011
  48. annuities

    8. Mary would like to save $10 000 at the end of 5 years for a future down payment on a car. How much should she deposit at the end of each week in a savings account that pays 12%/a, compounded monthly, to meet her goal? a. What type of annuity is this? c.

    asked on January 17, 2011
  49. Calculus

    Find the functions a) f o g, b) g o f, c) f o f, d) g o g, and their domains. f(x)= square root of x, g(x)= cube root of 1-x These are my answers, but I am not sure about them and I only figured out one domain... that is the part that really confuses me.

    asked on September 19, 2010
  50. Org. Chem.

    1. Are the following soluble, insoluble, or partially soluble. - Benzophenone in hexane? - 1-octanol in hexane? I think soluble? - 1-butanol in water? in hexane? - methyl alcohol in hexane? I think partially soluble? Please help me and explaining would be

    asked on September 13, 2009
  51. chemistry

    For the following chemical reaction, how many moles of silver iodide (AgI) will be produced from 4 mol of calcium iodide (CaI2)?

    asked on April 24, 2015
  52. coordinate algebra

    The area of a rectangle is found by multiplying the length by the width: A = lw. A certain rectangle has an area of x2 + 7x + 12. Factor the trinomial to find the length and width of the rectangle. In the form of a paragraph, describe the process necessary

    asked on December 2, 2014
  53. college statistics

    the average length of time required for students to complete a test in a an introductory statistics course is found to be 50 minutes with a standard deviation of 12 minutes. if students are allowed 80 minutes to complete the test , approximately what

    asked on November 6, 2014
  54. Calculus II

    the gamma function r(x) is defined by r(x)= integral from 0 to infinity of x^n-1(e^-1)dx where n>0. Use integration by parts to show that r(n+1)=nr(n).

    asked on April 7, 2014
  55. Calculus II - Trapezoidal Rule

    Find the error resulting from approximation by Trapezoidal Rule: integral (from 0 to 1) sqrt(1+ x^3) dx .... compute the results for n=8

    asked on February 17, 2014
  56. Physics Please check my answers

    1. A fluid can only be a liquid. True

    asked on February 3, 2014
  57. Math (PreCal)

    Kurt wants to sail his boat from a marina to an islnd 15 miles east of the marina. Along the course, there are several small islands they must avoid. He sails first on a heading of 70 degrees and then on a heading of 120 degrees. What is the total distance

    asked on January 13, 2014
  58. Chemistry

    If a solution containing 52.044 g of mercury(II) chlorate is allowed to react completely with a solution containing 15.488 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after

    asked on October 13, 2013
  59. science

    4. Bacillus thuringiensis (Bt) is a bacterium that contains a gene that results in the production of a natural pesticide that kills insects. Genetic engineers have successfully inserted this Bt gene into the DNA of some corn varieties, allowing the corn to

    asked on December 19, 2012
  60. geometry

    A classroom has a floor area of 600 square feet. What is the floor area of the classroom in square meters? describe three different correct ways to solve this area problem. Each way of solving should use the fact that 1 inch = 2.54cm. Explain your

    asked on October 21, 2012
  61. physics

    An explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender metal handrail. The speeds of sound in air, water, and the handrail are 355, 1410, and 5380 m/s,

    asked on April 29, 2012
  62. Math

    A farmer has 80 feet of fencing, which she plans to use to fence in a plot of land for a pigpen. If she chooses to enclose a plot along the broad side of her barn, what is the largest area that can be enclosed? (Note: The side along the barn will not

    asked on January 31, 2012
  63. statistics

    If a piece of toast falls off your breakfast plate, is it more likely to land with the buttered side down? According to Murphy’s Law (the assumption that if anything can go wrong, it will), the answer is “Yes.” Most scientists would argue that by the

    asked on January 24, 2012
  64. Algebra

    Speed of passenger train is 6mph faster than the freight train. The passenger train travels 260 miles at the same time the freight train travels 230 mph. WHAT would be the speed of both the passenger and freight trains?????

    asked on December 13, 2011
  65. math

    A shipping company owns a fleet of heavy trucks. If the purchase price of each truck is $245,000 and its value depreciates by 15 percent per year, what is the value of each truck after 4 years? I got $127891.5313. Am i right?

    asked on August 23, 2011
  66. Math

    What is the slope of a horizontal line?

    asked on June 6, 2011
  67. Statistics

    Supposed (as is roughly correct) that each child born is equally likely to be a boy or a girl and that sexes of successive children are independent. If we let BG mean that the older child is a boy, and the younger child is a girl, then each of the

    asked on May 28, 2011
  68. Identifying patterns

    If the pattern of polygons continues, how many sides will polygon 98 have? and there is a picture of polygon 1 which is a 3-sided triangle polygon 2- which is is a sqaure polygon 3- which is a 5 sided pentagon. polygon 4- which is a six sided hexagon

    asked on May 11, 2011
  69. chemistry

    the word equation for sodium and water is: sodium+water-->sodium hydroxide+hydrogen sodium and chlorine: sodium+chlorine-->sodium chloride what will the equation for aqueous chlorine with aqueous potassium iodide be?

    asked on October 17, 2010
  70. Calc

    Find the functions a) f o g, b) g o f, c) f o f, d) g o g, and their domains. f(x)= square root of x, g(x)= cube root of 1-x These are my answers, but I am not sure about them and I only figured out one domain... that is the part that really confuses me.

    asked on September 20, 2010
  71. math

    what is the area of the circumscribed square about a circle having a 12pie perimeter?

    asked on March 17, 2010
  72. Chem.

    Why is it not possible to achieve a complete separation of the ethanol from the water in the clarified reaction mixture via simple distillation? I'm not sure about this because I thought the difference between fractional (what was done) and simple

    asked on December 8, 2009
  73. Dr. Russ- Org. Chem.

    Yes, there was a difference in my results between the solubilities of benzophenone in methyl alcohol and benzophenone in hexane. Benzophenone [essentially nonpolar (slightly polar due to the C=O bond)] was soluble in methyl alcohol, but only partially

    asked on September 15, 2009
  74. Org. Chem.

    why don't water and benzophenone hydrogen bond? benzophenone has a C=O and water forms H bonds too.

    asked on September 14, 2009
  75. Algebra

    A group of students plotted the number of hours they worked at a cake shop during the holidays and the number of cakes they delivered in a week. Graph shows 0 to 60 on x axis and y axes at increments of 10. The label on the x axis is Weekly Hours Worked,

    asked on November 13, 2017
  76. Math aglebra

    I need help RIGHT NOW!!!!!!!!!!!!!! On the blueprints of Adam's office building, the length of his rectangular office space is 5 1/4 inches. If the actual length of Adam's office space is 10 1/2 feet, what is the scale of the blueprint?

    asked on November 23, 2016
  77. Math

    Find the volume of a cake of edge 4cm.

    asked on August 10, 2016
  78. Heart of Darkness

    1. Different settings. Consider how Kurtz and the pilgrims act differently in the following settings. • Belgium For this one I said they act very civilized because they want to keep up appearances, but I don't remember any specific examples • The Congo

    asked on December 6, 2015
  79. Chemistry

    A compound isolated from oil of mint has a characteristic cool, refreshing odour. It is frequently used in cough drops to ease the pain of a sore throat. This compound contains only C, H, and O. If 95.6 mg of this compound burns completely in O2, and

    asked on October 18, 2015
  80. Chemistry

    A compound isolated from oil of mint has a characteristic cool, refreshing odour. It is frequently used in cough drops to ease the pain of a sore throat. This compound contains only C, H, and O. If 95.6 mg of this compound burns completely in O2, and

    asked on October 18, 2015
  81. physics

    A speeder driving down the road at a constant 20m/s passes a patrolman parked on the roadside. The patrolman waits 3 seconds then pursue the speeder accelerating at a constant 4m/s2. When does the patrolman catch the speeder

    asked on September 22, 2015
  82. Chemistry

    Copper is changed to copper(II) ions by nitric acid according to the following equation: 4HNO3 + Cu → Cu(NO3)2 + 2NO2 + 2H2O How many moles of HNO3 must react to produce 0.961 mol of NO2?

    asked on February 6, 2015
  83. project

    Virginia ratified the constitution with the help of all of the following men EXCEPT: A.Washington B.jefferson C.henry D.Madison

    asked on May 6, 2014
  84. Physics

    I need to check my answers for the following: An Aston Martin V8 Vantage sports car has a maximum “lateral acceleration” of 0.96 “g’s”, after which the car begins to skid out of its turn. 2.1 Calculate the coefficient of static friction between

    asked on March 31, 2014
  85. Calculus II

    show that; given any three non-collinear points (x1,y1), (x2,y2), (x3,y3) there is a parabola p(x)=Ax^2+ Bx + c , containing the three points.

    asked on February 17, 2014
  86. chemsitry

    The molecular geometry of POCl3 is tetrahedral. What hybridization does this indicate for the central P atom? Why is the answer spy?

    asked on December 11, 2013
  87. Physics

    A pulley of mass mp , radius R , and moment of inertia about its center of mass Ic , is attached to the edge of a table. An inextensible string of negligible mass is wrapped around the pulley and attached on one end to block 1 that hangs over the edge of

    asked on November 24, 2013
  88. Chemistry #27

    Given that: H2 (g) + F2 (g) ---> 2HF (g) H(rxn)= -546.6 kJ 2H2 (g) + O2 (g) ---> 2H2O (l) H (rxn)= -571.6 kJ calculate the value for H(run) for... 2F2(g) + 2H2O (l) ---> 4HF (g) + O2 (g) _____kJ?

    asked on October 28, 2013
  89. Chemistry #11

    A solution of ethanol (C2H5OH) is prepared by dissolving 35.0 ml of ethanol in enough water to make 120.0 ml of solution. What is the molarity of the ethanol in this solution? 46.07 g= molar mass of ethanol .079 g/ml=density

    asked on October 14, 2013
  90. Chemistry

    If a solution containing 52.044 g of mercury(II) chlorate is allowed to react completely with a solution containing 15.488 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after

    asked on October 13, 2013
  91. Chemistry 10

    reaction of AgNO3 with BaO... Would it be Ag^+ + O^---> AgO (s)

    asked on October 5, 2013
  92. Chemistry

    Zinc reacts with hydrochloric acid according to the reaction equation... Zn (s) + 2HCl (aq) ---> ZnCl2 (aq) + H2 (g) How many milliliters of 5.00 M HCl (aq) are required to react with 5.55 g of Zn (s)??

    asked on October 4, 2013
  93. physics

    A 5-kg box is pushed across a horizontal floor by a 20-N force that is angled 30 degrees below the horizontal. What is the coefficient of kinetic friction between the box and the floor if the box is pushed at a constant speed?

    asked on July 10, 2013

    How much heat must be added to 1.0 kg of iron to raise its temperature from 20°C to 95°C? (ciron = 0.11 cal/g•°C)

    asked on July 3, 2013
  95. Health

    What type of questions should a patient ask a doctor before getting cosmetic surgery?

    asked on June 14, 2013
  96. Physics! Please help me!

    An oscillating block-spring system has a mechanical energy of 5.1 J, an amplitude of 0.81 m, and a maximum speed 1.6 m/s. Find the spring constant k of the spring. What is the mass of the block? What is the frequency of oscillation?

    asked on April 24, 2013
  97. Math

    A tower stands on a 20 degree slope. From a point 45 m directly up the slope. The angle of elevation of the top of the tower is 10 degrees. How tall is the tower?

    asked on April 14, 2013
  98. chemistry

    If 22.4 dm3 of steam react with MgO, calculate the mass of the product that will form.

    asked on February 18, 2013
  99. Chemistry

    How many cubic decimeters of oxygen are needed to react with sulfur to produce 5.00 * 103 cubic decimeters of sulfur dioxide?

    asked on February 18, 2013
  100. Physics

    The orbit of a Moon about its planet is approximately circular, with a mean radius of 2.24 × 10 8 m. It takes 35.5 days for the Moon to complete one revolution about the planet. Find the mean orbital speed of the Moon. Answer in units of m/s Find the

    asked on February 12, 2013


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