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. 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
  5. 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
  6. 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
  7. math

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

    asked on March 6, 2012
  8. 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
  9. .....

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

    asked on February 14, 2011
  10. 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
  11. chemistry

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

    asked on January 27, 2013
  12. chemsitry help again please

    Write the formula of the conjugate base for acid HClO2 .

    asked on November 19, 2013
  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. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. chemistry

    molecular and net ionic equations for FeCl3 + Na2S

    asked on June 21, 2011
  20. 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
  21. 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
  22. 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
  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. 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
  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. chemistry

    rubidium is the fourth element in group 1. predict the following properties of rubidium and its compunds: A. appearence B. hardness C. reaction with water D. appearance and solubility of rubidium chloride E. electrical conductivity

    asked on October 12, 2010
  27. 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
  28. 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

    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

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

    asked on October 4, 2013
  31. 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
  32. 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
  33. math rate of change

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

    asked on June 8, 2011
  34. 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
  35. Calc.

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

    asked on November 15, 2010
  36. 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
  37. 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
  38. 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
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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
  44. English

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

    asked on November 17, 2011
  45. 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
  46. 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
  47. 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
  48. 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
  49. Math

    Suppose that the river was moving with a velocity of 3 m/s, North and the motor boat is moving with a velocity of 4 m/s, East. If the width of the river is 80 meters wide, then how much time does it take the boat to travel shore to shore? What distance

    asked on September 12, 2009
  50. formal geomerty

    A person in a small boat sights the top of a 40-foot lighthouse found on a cliff. The angle of elevation to the top of the lighthouse is 50.2 degrees. If the distance from the base of the cliff to the boat is 75 feet,what is the height of the cliff?

    asked on February 22, 2009
  51. 4th grade math

    What is the greatest remainder if the divisor is 4?

    asked on February 17, 2009
  52. 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
  53. 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
  54. 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
  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. 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
  58. 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
  59. 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
  60. Algebra

    how do you write a polynomial equation that represents the cost of renting a car for m miles.The cost to rent a car for a day is $15 plus $0.15 for each mile driven. help please!!!!

    asked on December 1, 2011
  61. Chemistry

    Calcium reacts with water according to the chemical equation below: Ca + 2H2O--> Ca(OH)2 + H2 All but which reaction is expected to occur on the basis of the reaction of calcium and water?

    asked on October 25, 2011
  62. Chemistry

    Calcium reacts with water according to the chemical equation below: Ca + 2H2O--> Ca(OH)2 + H2 All but which reaction is expected to occur on the basis of the reaction of calcium and water?

    asked on October 25, 2011
  63. 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
  64. Physics

    When a high-speed passenger train traveling at 124 km/h rounds a bend, the engineer is shocked to see that a locomotive has improperly entered onto the track from a siding and is a distance D=666 m ahead. The locomotive is moving at 21 km/. The engineer of

    asked on June 14, 2011
  65. Math

    What is the slope of a horizontal line?

    asked on June 6, 2011
  66. 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
  67. Physics

    A bar of aluminum (bar A) is in thermal contact with a bar of iron (bar B) of the same length and area. One end of the compound bar is maintained at Th = 75.5°C while the opposite end is at 30.0°C. Find the temperature at the junction when the energy

    asked on November 27, 2010
  68. 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
  69. physical education

    please correct me if i am wrong the body has 3 different joints: A. fixed or immovable joints B. slightly movable C. freely movable

    asked on October 17, 2010
  70. physics

    a stone of mass 30 grams is placed in a measuring cylinder containing some water. the reading of the water level increases from 50cm cubic to 60cm cubic. what is the density of te stone?

    asked on September 29, 2010
  71. Algebra

    factor completely 256-x^4

    asked on March 19, 2010
  72. math

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

    asked on March 17, 2010
  73. maths

    A paving block is is in the shape of a prism, the area of it' cross section being 154cm^2.The prism i 17cm long ad the material from whih it is made has a density of 2.2g/cm^3. Calculate the mass of the paving block. Please can you tell me the method

    asked on June 6, 2009
  74. Physics

    Anthony Rizzo hits a baseball in such a way that it leaves his bat traveling at 40.4 m/s at an angle of 26 degrees above the horizontal. When hit, the baseball is 1.2 m above the ground, is in fair territory, and is 127 meters away from a 3.5 m tall fence?

    asked on November 16, 2017
  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. 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
  78. 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
  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. 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
  81. 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
  82. Statistics

    The results of a nationwide survey show that 57.40% of college students have violated rules of alcohol use. The margin of error for the survey is 2.30%. What does this mean?

    asked on February 27, 2015
  83. Math

    Three eights of the cast in a musical have to sing. What fraction of the cost does not have to sing?

    asked on February 5, 2015
  84. 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
  85. 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
  86. 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
  87. Physics

    A heat engine absorbs 126 kcal of heat and exhausts 77 kcal of heat in each cycle. Calculate the efficiency (as a percentage)

    asked on February 1, 2014
  88. 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
  89. chemistry

    Please I need help in knowing how to solve this. I know I need to take the antilog of something but don't know what.What is the values of [H3O+] for a solution with [OH−]=1×10−5M?

    asked on November 22, 2013
  90. chemistry

    5.00×10−3mol of HBr are dissolved in water to make 15.0L of solution. What is the concentration of hydroxide ions, [OH−], in this solution?

    asked on November 21, 2013
  91. Chemistry

    A certain gas has a density of 1.053 g/L at 25C and 752 mmHg. What is the molar mass of this gas?

    asked on October 15, 2013
  92. 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
  93. 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
  94. 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
  95. 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
  96. Chemistry 10

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

    asked on October 5, 2013
  97. 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
  98. 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
  100. Health

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

    asked on June 14, 2013


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