Most popular questions and responses by Chris
  1. Educational Technology

    1. Which of the following choices is a strategy that could help with time management? A. Spending most of the day on leisure activities. B. Doing homework in every spare moment. C. Cutting back on sleep. D. Creating a list of tasks to be completed daily.*

    asked on April 16, 2014
  2. novel help

    Hello, I need to write a short review on the novel Girl Interrupted while I have read the book twice I can't find how the disorder that Susanna Kaysen has affected her family members, does it say in the book, also I need to put what treatment she received

    asked on October 12, 2008
  3. algebra

    student takes out two loans 1 at 10% and the other at 12 percent interest the 10 percent loan is $2000 more then the 12% loan and the total interest for one year is $430 how much is each loan?

    asked on November 17, 2014
  4. math 7th

    When the temperature is 68°F, the speed of sound in air is approximately 343 meters per second. Approximately how many kilometers does sound travel in five seconds? Can some one help with the steps?

    asked on April 24, 2013
  5. Chemisry

    what mass of protons would be required to just neutralize the charge of 1.0g of electrons? how do I answer this? You know the mass of an electron. Calculate how many are in 1 gram. You will need the same number of protons. Knowing the mass of a proton

    asked on February 8, 2007
  6. Chemistry

    Consider the following equilibrium process at 700°C: 2H2 + S2 ↔ 2H2S Analysis shows that there are 2.50 moles of H2, 1.35x10^-5 mole of S2, and 8.70 moles of H2S present in a 12.0-L flask. Calculate the equilibrium constant Kc for the reaction.

    asked on March 9, 2009
  7. Physics

    A 39-turn circular coil of radius 3.20 cm and resistance 1.00 Ω is placed in a magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies in time according to the expression B = 0.010 0t + 0.040 0t2, where B

    asked on March 3, 2015
  8. Physics

    A spring of unknown force constant is attached to a rod so that it hangs vertically. With no mass attached, the spring has a length of 12.0 cm. When a student attaches a mass of 50 grams, the spring stretches to a length of 18.0cm. Determine the force

    asked on March 3, 2014
  9. Chemistry

    Magnesium sulfate is often used it first aid hot-packs giving off heat when dissolved in water. When 2.00 g of MgSO4 dissolves in 15.0 mL of water (d= 1.00g/mL) at 25.0ºC, 1.51 kJ of heat is evolved. A) Write the balanced equation for this reaction. I

    asked on January 28, 2007
  10. Math

    Eryn and seven of her friends go out to lunch. The total bill comes to $143.35. They decide to leave a 15% tip. Each person will contribute an equal amount to the total tip. Estimate what each person should contribute.

    asked on January 7, 2015
  11. Math

    You are given 9 to 1 odds against tossing three heads with three coins, meaning you win $9 if you succeed and you lose $1 if you fail. (Find the expected value of the described game. Would you expect to win or lose money in 1 game? in 100 games? Explain.

    asked on April 14, 2011
  12. math

    32 gal/min = qt/h

    asked on August 21, 2014
  13. Algebra I

    What is the answer to Algebra with pizzaz p.93 How Can Fisherman Save Gas?

    asked on March 2, 2009
  14. Chemistry

    Given 2Al2O3 (s) --> 4Al(s) + 3O2 (g) (standard enthalpy change= 3351.4 kJ) a) What is the heat of formation of aluminum oxide? How do I find heat of formation from standard enthalpy change? I know how to do it when I'm given enthalpy, but they aren't the

    asked on January 31, 2007
  15. Math

    13. A true or false test has 8 questions. What is the probability of guessing the correct answers to all the questions? A. 1/10 B. 1/16 C. 1/64 D. 1/256

    asked on April 17, 2014
  16. P.E

    The way in which your emotions affect your physical and overall health is part of? A. setting goals B. heredity C. the mind-body connection. D. your cultural environment. I think its c

    asked on September 8, 2014
  17. chemistry

    Asprin, C9H8O4, is prepared by reacting salicylic acid, C7H6O3, with acetic anhydride, C4H6O3, in the reaction C7H6O3(s) + C4H6O3(l) -> C9H8O4(s) + C2H4O2(l) A student is told to prepare 45.0 g of aspirin. She is also told to use a 55.0% excess of the

    asked on October 18, 2006
  18. Chemistry

    Calculate the enthalpy change for the reactions NO(g) + O(g) → NO2(g) from the following data: NO(g) + O3(g) → NO2(g) + O2(g) ΔH = -198.9 kJ O3(g) → 1.5O2(g) ΔH = -142.3 kJ O2(g) → 2O(g) ΔH = 495.0 kJ Put the answer in kJ.

    asked on May 5, 2014
  19. Chemistry

    Calculate the concentrations of all species in a 1.41 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. Na^+ = 2.82M SO3^2- = 1.40M HSO3^- = 0.00047M H2SO3 = OH^- = H^+ = I have

    asked on October 11, 2012
  20. world history

    Which option accurately describes key events of Peter the Great’s reign? His reign involved the Northern War, gaining access to the Baltic, and founding a new capital in St. Petersburg. His reign involved a disastrous invasion of England in 1812, and he

    asked on January 22, 2019
  21. Math

    A carpenter has several boards of equal length. he cuts 3/5 of each board. After cutting the boards, the carpenter notices that he has enough pieces left over to make up the same length as 4 of the original boards. How many boards did the carpenter start

    asked on May 7, 2014
  22. English

    I need help trying to construct an Extended metaphor. The topic being People who use cell phones while a movie is going on. Please help thanks . Thank you for using the Jiskha Homework Help Forum. The first thing to understand is the definition of an

    asked on August 23, 2006
  23. P.E

    all of the traits passed biologically from parent to child are known as? A. risk factors. B. behavior. C. heredity. (D.) environmental influences.

    asked on September 5, 2014
  24. Chem 1

    The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0g of luminol into a total volume of 75.0 \rm mL of \rm H_2O. What is the molarity of the stock solution of luminol? 1.13M Before investigating the scene, the

    asked on March 13, 2013
  25. math

    Add the following vectors using the Component law. a. 9 m/s [N30°E] and 2 m/s [N 60°E]. b. 3 N in a direction 15° south of west and 4 N in a direction 12° east of south.

    asked on November 12, 2018
  26. Physics

    An athlete swims from the North end to the South end of a 50.0 Meter pool in 20.0 seconds, and makes the return trip to the starting point in 20.0s A. What is the average velocity for the first half of the swim B.What is the average velocity for the

    asked on September 2, 2015
  27. Chemistry

    The heat of solution of ammonium chloride is 15.2 kJ/mol. If a 6.187 g sample of NH4Cl is added to 65.0 mL of water in a calorimeter at 26.5°C, what is the minimum temperature reached by the solution? [specific heat of water = 4.18 J/g°C; heat capacity

    asked on May 5, 2014
  28. physics

    A 0.13 kg ball of dough is thrown straight up into the air with an initial speed of 18 m/s. The acceleration of gravity is 9.81 m/s2 .What is its momentum halfway to its max- imum height on the way up?

    asked on February 24, 2014
  29. Chemistry

    Write the dissociation reaction and the corresponding Ka equilibrium expression for each of the following acids in water. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer. Omit water in your answer.) (a)

    asked on March 3, 2012
  30. Chemistry

    A sample of methane (CH4) gas contains a small amount of helium. Calculate the volume percentage of helium if the density of the sample is 0.70902 g/L t 273K and 1.00 atm. I know that the sample is at STP and that the 1 mole of gas under these conditions

    asked on October 29, 2014

    What coefficients are needed to balance the equation for the complete combustion of methane? Enter the coefficients in the order CH4,O2,CO2, and H2O,respectively. Express your answer as four integers, separated by commas (e.g., 1,2,3,4).

    asked on October 13, 2011
  32. physics

    A cart of mass 340 g moving on a frictionless linear air track at an initial speed of 1.2 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. After the collision the first cart continues in its original direction at

    asked on March 4, 2007
  33. Physics

    You are standing at the top of a cliff that has a stair step configuration. There is a vertical drop of 7 m at your feet, then a horizontal shelf of 8 m, then another drop of 3 m to the bottom of the canyon, which has a horizontal floor. You kick a rock,

    asked on February 5, 2013
  34. Math

    Lily estimated a quotient of 120 and found an actual quotion of 83. What should she do next? Explain.

    asked on February 20, 2013
  35. chemistry

    We are doing a lab that requires finding the molarity of an unknown AgNO3 solution after reacting NaCl + AgNO3 --> NaNO3 and AgCl and collecting/massing the precipitate. We will be using 10.00 mL of an NaCl solution and 10.00 mL of the AgNO3 solution. We

    asked on October 4, 2006
  36. Science

    How many Btu's are required to change five pounds of ice at 20°F to water at 160°F? a. 2,608 Btu’s b. 1,390 Btu’s c. 1,304 Btu’s d. 141 Btu’s I am trying ((160-20)x.5)x5 but not getting any of the possible choices. What am I missing? Thanks for

    asked on March 13, 2016
  37. Math

    A warranty identification number for a certain product consists of a letter of the alphabet followed by a seven-digit number. How many possible identification numbers are there if the first digit of the seven-digit number must be nonzero?

    asked on April 3, 2012
  38. Chemistry

    Given the thermochemical equation 2SO2 + O2 → 2SO3, ΔH°rxn = -198 kJ/mol, what is the standard enthalpy change for the decomposition of one mole of SO3?

    asked on May 5, 2014
  39. Math

    Simplify 15C3 A. 182 B. 455 C. 2,730 D. 910

    asked on April 17, 2014
  40. Science

    True/false Earth's atmosphere oceans and continents began to form during the first several hundred million years of the Precambrian time.

    asked on November 17, 2014
  41. Math

    To find the difference of 7 - 3 5/12 how do you rename the 7?

    asked on March 2, 2017
  42. College Algebra Application

    Newton's Law of Cooling T(t)=T0+(T1-T0)e^-kt The police discover the body of a murder victim. Critical to solving the crime is determining when the murder was committed. The coroner arrives at the murder scene at 12:00pm. She immediately takes the

    asked on May 5, 2011
  43. Physics

    A player strikes a hockey puck giving it a velocity of 47.673 m/s. The puck slides across the ice for 0.175 s after which time its velocity is 46.473 m/s. The acceleration of gravity is 9.8 m/s2 . If the puck strikes the goalie’s pads and stops in a

    asked on January 8, 2011
  44. Chemistry

    What are the formulas of the salts that precipitate when the reaction mixture (n-butyl alcohol, sodium bromide, water, and sulfuric acid) is cooled?

    asked on December 2, 2013
  45. chemistry

    net ionic equations for Ca(NO3)2 +NaPO4

    asked on April 15, 2013
  46. Math

    A number cube with numbers 1 through 6 is rolled. Find the given probability. P(complement of 4) A. 1/6* B. 5/6 C. 2/6 D. 4/6

    asked on April 8, 2014
  47. math

    a recent survey of 8 randomly selected social networking sites has a mean of 13.1 million visitors for a specific month. the standard deviation is 4.1 million find the confidence interval of the true mean

    asked on November 13, 2017
  48. probability

    As in an earlier exercise, busy people leave the park according to a Poisson process with rate λ1=3/hour. Relaxed people leave the park according to an independent Poisson process with rate λ2=2/hour. Each person, upon leaving the park, makes a decision

    asked on November 27, 2018
  49. Calculus

    "Two cars are traveling along perpendicular roads, car A at 40mph, car B at 60mph. At noon, when car A reaches the intersection, car B is 90miles away, and moving toward it. At 1PM the distance between the cars is changing at what rate?" So lost! Please

    asked on January 24, 2012
  50. Science/Chemistry

    Write a Balanced equation for the chemcial reaction Acetylene gas (C2H2) burns in a welding torch with oxygen to form carbon dioxide gas and water vapor. C2H2(g) + O2(g) ==> CO2(g) + H2O(g) It isn't balanced. I will leave that for you. How do i balance it?

    asked on March 15, 2007
  51. Math

    How do I solve this? tan^2x= 2tanxsinx My work so far: tan^2x - 2tanxsinx=0 tanx(tanx - 2sinx)=0 Then the solutions are: TanX=0 and sinX/cosX = 2 sin X Divide through by sinX: we have to check this later to see if allowed (ie sinX is not zero) cosX=1/2

    asked on January 7, 2007
  52. Physical Education

    Two bodies are thrown vertically upwards with the same initially velocity of 98metre/sec but 4 sec apart.How long after is thrown will they meet?

    asked on August 25, 2010
  53. Math

    Food Express is running a special promotion in which customers can win a free gallon of milk which their food purchase if there is a star on their receipt. So far, 147 of the first 156 customers have not received a star on their receipts. What is

    asked on April 17, 2014
  54. Social Studies

    Politics most informs a person's actions in? A.civic life B. work life C. private life D. school life

    asked on September 15, 2014
  55. chemistry

    Fructose is a sugar commonly found in fruit. A sample of fructose, C6H12O6, weighing 4.50 g is burned in a bomb calorimeter. The heat capacity of the colorimeter is 2.115 E4 J/ºC. The temperature in the calorimeter rises from 23.49ºC to 27.71ºC. A)What

    asked on January 28, 2007
  56. Math

    Six gross of special drawing pencils were purchased for use in a department. If the pencils were used at the rate of 24 a week, the maximum number of weeks that the 6 gross of pencils would last is?

    asked on November 5, 2016
  57. physics

    An oil tanker's engine have broken down and the wind has accelerated the tanker to a speed of 1.5m/s straight toward a reef. When the tanker is 500m from the reef, the wind dies down just as the engineer gets the engines going again. The rudder is stuck,

    asked on November 16, 2006
  58. P.E

    The health triangle is made up of(choose all that apply)? 3 points A. Monetary health. (B.) social health. (C.) physical health. (D.)mental and emotional. that's what i think. help fast. choose three.

    asked on August 26, 2014
  59. Chemistry

    The Ka values of H3PO4 are shown below. Ka1 7.5 10-3 Ka2 6.2 10-8 Ka3 4.8 10-13 What is the pH of a 0.19 M solution of NaH2PO4?

    asked on March 8, 2009
  60. chem

    Consider the decomposition of ammonium hydrogen sulfide: NH4Hs(s) NH3(g) + H2S(g) In a sealed flask at 25*C are 10.0 g NH4HS, ammonia with a partial pressure of .692 atm, and H2S with a partial pressure of .0532 atm. When equilibrium is established, it is

    asked on April 9, 2007
  61. math

    a piece of ribbon is cut into two shorter pieces in the ratio 2.8 : 1.25 The difference in the length of the shorter pieces is 80.6 cm. What is the length of the original piece?

    asked on January 6, 2015
  62. geometry

    if triangle FGH~ to Triangle PQR, FG = 6, PQ = 10 and the perimeter of trinagle PQR is 35 find the perimeter of triangle FGH

    asked on December 13, 2010
  63. Analytical

    Calculate the pH of 7.2 × 10-8 M HCl. Report your answer to the hundredths place. Next, What fraction of the total H in this solution is from the HCl? Report your answer to the hundredths place.

    asked on September 27, 2012
  64. math

    Chad buys peanuts in 2 pound bags. He repackages them into bags that hold 5/6 pound of peanuts. How many 2 pound bags of peanuts should Chad buy so that he can fill the 5/6 pound bags without having any peanuts left over?

    asked on May 7, 2014
  65. Chem

    Could you please tell me if these are right? How many moles are in the following. A.) 80.0 g of NaOH I got 2.0 moles. B.) 12.0 g of Ca(OH)2 I got 0.16 moles. Write the simplest formula for each of the following compounds. A.) 0.200 mole Al and 0.600 Cl. I

    asked on October 19, 2010
  66. chem

    Barium nitrate is added to a solution of .025 M sodium fluoride. a) At what concentration of Ba+2 does a precipitate start to form? b) Enough barium nitrate is added to make [Ba+2]= .0045 M. What percentage of the original fluoride ion has precipitated?

    asked on April 10, 2007
  67. Math

    Vector u has a magnitude of 5 units, and vector v has a magnitude of 4 units. Which of these values are possible for the magnitude of u + v? I believe there are more than one answers: A: 1 Unit B: 9 units C: 11 Units D: 13 Units

    asked on March 21, 2019
  68. chemistry

    Naphthalene, commonly known as moth balls, is composed of 93.7% carbon and 6.3% hydrogen. determine the empirical for naphthalene. molecular formula for Naphthalene. Determine the number of empirical formulas you would need to make a full naphthalene

    asked on November 28, 2012
  69. Math

    Start at 2. Create a pattern that adds 2 to each number and then multiplies by 3. Stop when you have 5 numbers?

    asked on January 1, 2019

    Superhero by.Kiana S. This student most likely creates art based on all of the following except A.personal interests B.personal style C.skill set D.knowledge of art history

    asked on January 14, 2015
  71. Chem

    Calculate [H3O ], [ClO4–], and [OH–] in an aqueous solution that is 0.170 M in HClO4(aq) at 25 °C.

    asked on March 27, 2013
  72. Math

    need direction on part c. Rosa and her friend build & paint a tree house. On monday they paint 2/5 of the tree house. On tuesday they paint 3/7 of the house. A - painting of the house need to be finished on wednesday. how much more work do they have to do?

    asked on February 29, 2016
  73. Science

    A glass window 0.50 cm thick measures 86 cm by 31 . How much heat flows through this window per minute if the inside and outside temperatures differ by 17 ? Express your answer using two significant figures. Q/t=_________kJ/min

    asked on January 9, 2012
  74. Chem

    What is the mole fraction of H2 in a mixture with the total pressure of 800 torr when the partial pressure of H2 is 90 torr?

    asked on June 29, 2011
  75. economics

    Market research has revealed the following information about the market for chocolate bars. The demand schedule can be represented by the equation QD=1,600-300P, where QD is the quantity demanded and P is the price. The supply schedule can be represented

    asked on July 9, 2010
  76. geometry

    In ∆RST, RS = 10, RT = 15, and m∠R = 32. In ∆UVW, UV = 12, UW = 18, and m∠U = 32. Which of the following statements is correct? 1. ∆RST ∼ ∆WUV and the similarity ratio is 56. 2. ∆RST ∼ ∆UVW and the similarity ratio is 56. 3. ∆RST ∼

    asked on November 3, 2011
  77. AP chem

    I have a problem set due tomorrow, and two problems in it were not covered in class. The first is this: Molybdenum has an atomic radius of 0.145 nm. The volume of its cubic unit cell is 0.0375 nm^3. What is the geometry of the molybdenum unit cell? I have

    asked on December 7, 2006
  78. Spanish

    SraJMcGin can you please help me? Modifique el texto por cambiar los verbos italizados de lo familiar (informal) a lo formal Prepara (1) prepare para salir de viaje el lunes por la mañana. Para ello, haz (2) haga las maletas, sal (3) salga de la

    asked on October 11, 2016
  79. Chem

    Consider the reaction: A(g)⇌2B(g) Find the equilibrium partial pressures of A and B for each of the different values of Kp. Assume that the initial partial pressure of B in each case is 1.0 atm and that the initial partial pressure of A is 0.0 atm. Make

    asked on May 15, 2015
  80. calculus help

    Farmer Brown wants to fence in a rectangular plot in a large field, using a straight rock wall that is already there as the north boundary. The fencing for the east and west sides of the plot will cost $3 a yard, but she needs to use special fencing, which

    asked on April 25, 2014
  81. Math

    .50x+.20y=3.60 x+y=9

    asked on February 5, 2014
  82. probability

    When you enter the bank, you find that there are only two tellers, both busy serving other customers, and that there are no other customers in queue. Assume that the service times for you and for each of the customers being served are independent

    asked on November 27, 2018
  83. physics

    An 840 Kg roller coaster car is launched from a giant spring of constant k=31 kN/m into a frictionless loop-the-loop track of radius 6.2 m, as shown below. What is the minimum amount that the spring must be compressed if the car is to stay on the track?

    asked on February 29, 2012
  84. sixth grade math

    The poster shows how many of its games the football team has won so far. Express this information as a fraction, a percent, and as a decimal. Can someone show me how to solve this problem?

    asked on November 12, 2014
  85. S.S

    Which of the following would describe how loyalists land was redistributed in Georgia? A. land was given to the indians who helped the patriots. B. land was given in bounty grants to soldiers for their advice. C. a lottery was held to grant land. D. land

    asked on October 23, 2015
  86. Chemistry

    Complete the following table for aqueous solutions of caffeine, C8H10O2N4. a) molality b) mass percent solvent c) Ppm solute All we're given is Mole fraction solvent= .900. How do I solve for the other parts with only this?? It XH2O = 0.9, then

    asked on March 20, 2007
  87. Chemistry

    Which of the following aqueous solutions are good buffer systems ? . 0.26 M hydrochloric acid + 0.24 M potassium chloride . 0.14 M acetic acid + 0.20 M potassium acetate . 0.16 M potassium hypochlorite + 0.23 M hypochlorous acid . 0.31 M hydrocyanic acid +

    asked on February 26, 2011
  88. Chemistry

    Calculate the pH of 7.2 × 10-8 M HCl. Report your answer to the hundredths place. Next, What fraction of the total H in this solution is from the HCl? Report your answer to the hundredths place. I apologize for the re-post, but I felt the previous one was

    asked on September 27, 2012
  89. Chemistry

    Suppose you tried to combine 42 grams of magnesium with 45 grams of oxygen. Which of the two substances would be left after the reaction? How much magnesium oxide will be formed?

    asked on October 3, 2010
  90. LA

    How does a genre affect the theme of a story - like A Christmas Carol? This site will give you a definition, plus types of literary genre. If "A Christmas Carol" were meant to be humorous, how

    asked on January 16, 2007
  91. Physics

    A bat moving at 5 meters per second is chasing a flying insect, if the bat emits a 40 khz chirp and receives back an echo at 40.4 khz what is the speed of the insect and will the bat be able to catch the insect?

    asked on February 2, 2016
  92. Social Studies

    which of the following best describes the purpose of the U.S constitution? A. It restricts rights of citizens. B. it outlines how the government should make laws. C. it establishes a national bank. D. it outlines basic rights for the people of all nations

    asked on October 7, 2014
  93. Chemistry

    What mass of lithium phosphate is needed to prepare 500.0 mL of a solution having a lithium ion concentration of 0.1385 M?

    asked on April 14, 2014
  94. Math

    The mean of Susan's math and science scores is 74 points. The mean of her math and English scores is 83 points. How many more points did Susan score in English than in science?

    asked on December 17, 2014
  95. physics

    A 0.23 kg ball of dough is thrown straight up into the air with an initial velocity of 12 m/s.Find the momentum of the ball of dough halfway to its maximum height on the way up.

    asked on March 15, 2012
  96. trig

    find exact value using sum or differnce equations. tan(19pi/12)

    asked on November 18, 2010
  97. Math

    Kyle is training for a bike race. He rides 5 miles one day, 10 miles the next day, and 15 miles the third day. If Kyle repeats this schedule, what is the total distance he will have ridden after 5 days?

    asked on January 16, 2014
  98. Chemistry

    How much heat (in kilojoules) is evolved or absorbed in the reaction of 2.90g of Fe2O3 with enough carbon monoxide to produce iron metal? Fe2O3 + 3CO ---> 2Fe + 3CO2 dH=-24.8kJ How do you find q (of the 2Fe in kJ).

    asked on April 6, 2011
  99. Math

    At age 25 someone sets up an IRA​ (individual retirement​ account) with an APR of 4%. At the end of each month he deposits ​$85 in the account. How much will the IRA contain when he retires at age​ 65? Compare that amount to the total deposits made

    asked on August 16, 2017
  100. Healthcare Finance

    Great Forks Hospital reported net income for 2007 of $2.4 million on total revenues of $30 million. Depreciation expense totaled $1 million. a. What were total expenses for 2007? b. What were total cash expenses for 2007? (Hint: Assume that all expenses,

    asked on May 25, 2013


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