Katherine

Questions and answers by visitors named Katherine

Questions

  1. In the following experiment, a coffee-cup calorimeter containing 100 mL of H2O is used. The initial temperature of the calorimeter is 23 degrees Celsius. If 4.00 g of CaCl2 is added to the calorimeter, what will be the final temperature of the solution in

  2. The voltage generated by the zinc concentration cell described by,

    Zn(s)|Zn2+ (aq, 0.100 M)||Zn2+ (aq, ____ M)|Zn(s) is 24.0 mV at 25 °C. Calculate the concentration of the Zn2 (aq) ion at the cathode. Hi, I posted this question awhile back but I think it

  3. Under standard conditions (298 K and 1 atm), which statement is true?

    a] diamond converts to graphite spontaneously b] graphite converts to diamond spontaneously c] none of the above How can the spontaneity of the reaction be reversed? a] increase the

  4. Indicate the number of equivalents in each of the following:

    4mol Mg2+ 0.1mol H+ 2mol Cl- 3mol Fe3+

  5. For the reaction described by the chemical equation:

    3C2H2(g) -> C6H6(l) .. Delta H rxn = -633.1 kJ/mol a) Calculate the value of Delta S rxn at 25.0 C... b) Calculate Delta G rxn... c) In which direction is the reaction, as written, spontaneous at 25 C and

  6. Combine the sentences by changing the italicized word group to an infinitive or infinitive phrase. Then write the complete sentence in the paragraph box.

    The weather bureau uses balloons. They determine the temperature aloft. (They determine the temperature

  7. Choose the correct rewriting of this algebraic fraction and give the exclusion represented by your choice.

    4y(8y+24)^ - 1 : 2y/2y+3 OR y/(2)(y+3)? y ≠ : +3 OR -3 ?

  8. There is a current being applied to an aqueous solution fo sodium bromide. What is produced at the cathode and anode?

    I said that Na(s) being produced at the cathode and Br2(l) being produced at the anode. The other options are H2 and O2 for either but

  9. Is it even possible to guess the signs of Delta H, S, and G from only knowing the following information?:

    - Silica gel is a solid. - Chemically inert. - Highly porous. - Amorphous form of SiO2. - Water vapor is absorbed onto the surface of silica gel and

  10. Consider two cells, the first with Al and Ag electrodes, and the second with Zn and Ni electrodes, each in appropriate 1.00M solutions of their ions.

    If 2.10g of metal is plated in the voltaic cell, how much metal is plated in the electrolytic cell? Another

  11. At 25 degrees Celsius all of these are true for a neutral solution : pH = 7.00, pOH = 7.00, and [H+] = [OH-] is that correct?

    For a neutral, aqueous solution regardless of temperature.. would the only correct statement be [H+] = [OH-]? pH = 7.00 and pOH =

  12. A 0.450-gram sample of impure CaCO3(s) is dissolved in 50.0 mL of 0.150 M HCl(aq). The equation for the reaction is:

    CaCO3(s)+2HCl(aq) -> CaCl2(aq) + H2O(l) + CO2(g) The excess HCl(aq) is titrated by 9.75 mL of 0.125 M NaOH(aq). Calculate the mass

  13. A 16 foot ladder is leaning against a wall. If the top slips down the wall at a rate of 4 ft/s, how fast will the foot be moving away from the wall when the top is 15 feet above the ground?

  14. Tiffany bought 2/5 kg of cherries. Linda bought 1/10 kg of cherries less than Tiffany. How many kg of

    cherries did they buy altogether?

  15. Silver chromate is sparingly soluble in aqueous solutions. The Ksp of Ag2CrO4 is 1.12× 10–12. What is the solubility (in mol/L) of silver chromate in 1.4 M potassium chromate aqueous solution? In 1.4 M silver nitrate aqueous solution? In pure water?

  16. an empty rectangle tank with a base area of 2400 cm^2 is filed with water from 2 taps. one tap can fill the tank with 12L of water per minute, while the other tap can do it at 3l less perminute.

    (A) what will be the depth of water in the tank after both

  17. 60cm3 of hydrogen diffused through a porous membrane in 10minutes.The same volume of gas G diffused through the same membrane in 37.4 minutes .Determine the relative molecular mass of G.(H=1)

  18. So I did a lab determining the chemical formula of a hydrate. We had to find the molecular formula of a hydrate of copper (2) sulphate, CuSO4 .xH2O. My observation table looks like this:

    Mass of clean, dry test tube: 21.6g Mass of test tube + hydrated

  19. What is the maximum value of the function y= 18/x^2-9 over the interval -3<x<3?

    A. 0 B. 2 C. -2 D. Infinity

  20. Calculate delta G of the reaction at 25 degrees C: 2Au^3+ (aq) + 3Ni(s) <=> 2Au(s) + 3Ni^2+(aq)

    Au3+ + 3e- ==> Au Eo = +1.50V Ni2+ + 2e- ==> Ni Eo = -0.23 V 2Au3+ + 3Ni ==> 3Ni2+ + 2Au The answer is -1.00 x 10^3 kJ but i'm not getting that answer!!!!!!!

  21. A current of 5.18 A is pass through a Cr(NO3)2 solution for 1.20 hours. How much chromium is plated out of the solution? __g

    I have no idea how to approach this. Here's what I tried to do logically but I'm not sure if it works out: I know that the

  22. Using the following data calculate Delta Sfus and Delta Svap for K in J/mol-k

    Tm(K) = 336, Delta H Fus(kJ/mol) = 2.33, Tb (K) = 1033, Delta H vap (kJ/mol) = 77.1 For Delta S fus i'm supposed to use 336 K the Tm value and for Delta S vap i'm supposed to use

  23. The ratio of the number of postcards john had to the number of postcards Zachary ha d was 4:9. Zachary had 45 more postcards than John. After giving some postcards to John, Zachary had 6/7 as many postcards as John.

    (A) How many postcards did Zachary have

  24. Sevnety-eight players entered a single elimination tennis tournament.How many matches were played to determine the overall champ?

    please help me...and if u get the answer can you explain how you got it with a rule or a pattern

  25. Daniel gave 4/5 of his stickers to Javier. Javier’s collection of stickers increased to 64. If Javier had 28 stickers in the beginning, how many stickers did Daniel have in the beinging?

    can u please show the work and explain how u got it...so i could

  26. every row and column contains the same numbers and the same math signs, but they are arranged in a different order each time. can you find the correct order to arrive at the finals totals shown.

    only using 4 8 3 5 and * + - to make 31 15 20 21 9 17 11 27

  27. A sand volleyball court has an area of 144 square metres and a perimeter of 52 metres. What are the dimensions of the volleyball court?

  28. Find the rectangle of largest area that can be inscribed inside the region bounded by y = 1 − x^2 and the x-axis, with one side on the x-axis.

  29. What word best describes people with shared customs, languages, or background?

    A. ethnic group B. immigrant C. multicultural D. population

  30. Which of the following is an example of indirect characterization

  31. The CEO of a major online retail corporation is searching for a site in Georgia to build a retail warehouse. In a fully developed paragraph, provide a recommendation for which region in Georgia this warehouse should be built. Be sure to include details on

  32. So I was doing homework and I have to make sentences with these words

    • open • feed •them •bag •Jessica •smell •ian •animal •uphold •maya •dust And I have to take out at least two words, I've been stuck on this question for at least

  33. Well, I now need help with math as well..

    What exclusions are placed on the variable x for the fraction: 4x^2-1/4x+2 ?

  34. In the play Heard It Through the Grapevine Which information supports that the idea that everyone is connected

  35. Combine the sentences by changing the (italicized) word group to an infinitive or infinitive phrase. Then write the complete sentence in the paragraph box.

    I need help with these too: #1. Bob used raspberry flavor in the cod liver oil. (It masks the taste

  36. I am not sure how to answer this can someone please explain it to me:

    Find a polynomial with integer coefficients that satisfies the given conditions. P has a degree 2, and zeros 1+i and 1-i Thank You!

  37. There are several technological applications for the transuranium elements (Z > 92). An important one is in smoke detectors, which can use the decay of a tiny amount of americium-241 to neptunium-237. What subatomic particle is emitted from that decay

  38. Can someone help me with this problem.... i have an exam coming tomorrow and im doing practice problems but i dont know how to do this

    Calculate the specific heat of a metal if 2.36102 grams of it at 99.5 degrees celsius is added to 125.0 mL of water at

  39. Hi, I need help finding a news article about 9/11. It has to be about 8 pages or longer. any links to any news??

    Thank you!

  40. Which factors led to the downfall of Ghana? Select all that apply.

    A. Ghana was engaged in conflict with people to the north. B. Ghana lacked nearby water resources. ******* C. Ghana was unwilling to participate in trade. D. Ghana's large population began

  41. A company paid $110,000 for a new 18-wheeler. When it is 9 years old it will be worth $20,000. Using straight-line depreciation, the value of the trick in dollars, V, is a linear function of its age in years, n. Find the function and the value when the

  42. Hi, so there is a Japanese Exchange Science Program and i need a science experiment for my application. The experiement has to be done in America and then in Japan. I have been searching online for ideas but nothing seems to come up. Will someone help me

  43. Hi, I am doing a civics project and right now I have to find an article about firearms that isn't biased and represents two sides. Can someone help find an article?

  44. A store sells two types of nut mixtures. The standard mix contains 100 grams of cashews and 200 grams of peanuts and sells for $2. The deluxe mix contains 120 grams of cashews and 40 grams of peanuts and sells for $2.50. The store has 15kilograms of

  45. So tomorrow I have a presentation about the universal law of gravitation and my partner did not work! At all! I'm really upset right now and I'm having trouble with understanding about the orbit of the moon. The slide has to be short and simple and I dont

  46. Since I am working on a project based on the poem "here" by Aracelis Girmay, how do people usually feel when reading this? What mood does it create for the readers?

  47. I was trying to solve for X in the equation 4/3 - 4/x = 3x-2/ 3x. I got -1 but I know the answer isnt right. Can someone help me fix my mistake? Thank you

  48. I am confused in how hellen keller and minnie riperton correlate with the poem "here" by aracelis girmay. So can someone please help me understand that? Thank you (:

  49. Hi, I am working on a project I chose for the poem "here" by Aracelis Girmay and I dont understand one line which is " I am so worried for Jacques Cousteau. I do not want him to get eaten." If someone can explain it to me, it would be great! Thanks.

  50. Hi, I am currently working on a project for this poem:

    Because I wanted to write a poem that would make me push away from the table & say Damn, & turn my face, even though I never say that word. Say Look, this is your saddest thing. That’s all. Your first

  51. Hi I have a question about my homework but my teacher doesn't explain to us very well so if someone can help me out.. iw ould appreciate it. Thank you.

    Find the quotient and remainder for x^5-x^4+7x^3-7x^2+5x-10/ x-1 thank you so much (:

  52. What is the base 7 representation of the number 275?

    21201 is the base 3 representation of what number? I'm having trouble with both questions. Can someone help me out? I tried using the internet but I was still confused.

  53. Which of the following is not considered part of the "golden age" of microbiology?

    A.First artificial vaccine is developed B.Gram stain is devised C, Viruses are defined D.all of the above Please do not guess I chose C but i think it was wrong

  54. Which of the following is not considered part of the "golden age" of microbiology?

    A.First artificial vaccine is developed B.Gram stain is devised C, Viruses are defined D.all of the above Who determined Archaea are the third domain of life? A.Carl Woese

  55. Why were the bill of rights known as dangerous?

  56. What does the constitution have to do with the concepts of rights, federalism, and division of powers?

  57. What is the concept of rights and how does the constitution and bill of rights treat it?

  58. I am doing a collage about Fahrenheit 451 and basically we have to make a collage with chunks of writing about quotes that relates back to our proposal. Would It be okay if someone looked at it?

    Proposal: I am interested in how the government doesn’t want

  59. What is another way the government in Fahrenheit 451 is not giving people choice or freedom other than not being able to read books.

  60. Can someone xplain what the golden ratio is and how we know that it MUST be irrational. What does this tell us about our Penrose tilings?

  61. I just have a stupid question..

    Does the phoenix in Fahrenheit 451 symbolize any type of freedom? Because I searched online, but it mostly says rebirth. But could it?

  62. I have to write a short silent play and I'm having trouble coming up with ideas. Can someone help?

    Its suppose to be in this format. 1. reveal information 2. raise the stakes somehow 3. have the character do something irrevocable s/he cant take back 4. top

  63. Suppose I use a scale on my map where every 3 inches on my map represents 5 miles. If a region on my map has an area of 45 square inches, what is the area of the actual region it represents?

    hi I need help with this question, I don't know what to do. thanks

  64. Let v be the vector <12,5> and let w be the vector <-4,3>. What is ||v||?

    Can someone help me, I am having trouble with the question. Thank you!

  65. What is the Columbian Exchange and how was it positive advantage?

  66. Triangle ABC has the side of lengths of 6,8,9.

    HGI is similar to ABC which has the side length of 12, 8, and its missing one length. What is the missing number. Can someone explain how to find that number.

  67.                     Self-Interview

    "I have always understood that's why I have been so frequently called 'a revolutionist.' It sounds as I have done some crime! Well, it may be the American black man does need to become involved in a real

  68.                     Self-Interview

    "I have always understood that's why I have been so frequently called 'a revolutionist.' It sounds as I have done some crime! Well, it may be the American black man does need to become involved in a real

  69. "I have always understood that's why I have been so frequently called 'a revolutionist.' It sounds as I have done some crime! Well, it may be the American black man does need to become involved in a real revolution. The word for " revolution" in German is

  70. Hi can someone explain what is meant by the inverse of a transformation

  71. I have an essay about symbolic occupation, but first I am suppose to know how did religion shape symbolic occupation but the text we have is very complicated to understand.

  72. I have an essay about J.H Elliott and I have to write about his arguments he made about symbolic occupation. Can someone help me what was his arguments.

  73. Bolivian adult females are much shorter than US females although the standard deviation of their heights is about the same at 2.3 inches. Only 4.1% of Bolivian females are at least five feet tall. What is the mean height of adult Bolivian women assuming

  74. Why does Yoni think the Arab he finds is perfect for his film?

    It was in Bethlehem, actually, that Yonatan found his Arab, a handsome man who used his first wish for peace. His name was Munir; he was fat with a big white mustache. Superphotogenic. It was

  75. "In the United Kingdom's Lotto game, a player picks six numbers from 1 to 49 fir each ticket. Rosemary brought one ticket for herself and one for each of her four adult children. She had the lottery ticket. When the sic winning numbers were drawn, Rosemary

  76. A car is backing up at a rate of 10km/hr. If the driver looks through his rear-view mirror, how fast does a tree, which is behind him, appear to approach him?

  77. If a ball is thrown upward on Mars with an initial velocity of 10.0 m/s and lands 1.50 m below its launch point 5.54 seconds after it is thrown , what is the local acceleration due to gravity one Mars .... Plzzzzzzzzz answer it's really important I have to

  78. To pass a slow vehicle within the length of the passing lane roger got up well over the speed limit . He then spotted a police cruiser coming around the corner and hit the brakes . If he braked at 6 m/s^2 , and it took him 1.50 seconds to get back to 40

  79. True or false? Negative numbers are closed under addition. Give a counterexample

    True or false? Prime numbers are closed under subtraction. Give a counterexample True or false? Natural numbers are closed under division. Give a counterexample

  80. So i was going over a problem that i didn't understand which is What is the slope of the function described in the table below?

    x I y 0 | -3 2 | -2 4 | -1 6 | 0 the choices were f) -3 g) 1/2 h) 2 J) 3 i know that the answer is g because my family told me

  81. I need an article that's local (new york city) and it has to have at least 1000 words and published in a major newspaper. Can someone help me find an article?

  82. Which of the following is equivalent to the expression 8 to the -5 power times 8 to the second power

    A) 1/8 to the 7 power B) 1/8 to the 3 power C) 8 to the 3 power D) 8 to the 7 power I was in between b and c but im pretty sure its c is it?

  83. How much solid ammonium chloride would be needed to make 100 mL of a 0.5M solution?

  84. Which of the following sentences contains a dependent clause?

    a) my mother, who never wastes anything, rinsed and saved the take-out boxes b) we were running late and, we had to skip stopping by the post office. c) I had never been to New York before this

  85. Which of the following sentences contains a dependent clause?

    a) my mother, who never wastes anything, rinsed and saved the take-out boxes b) we were running late and, we had to skip stopping by the post office. c) I had never been to New York before this

  86. 1. A company is deciding whether or not to hire a new worker. The company must pay the worker hourly and cover a daily cost for insurance. The cost to pay an hourly worker for one day is represented by the function y = 8x + 25, where x is hours.

    What is the

  87. What is the pattern of stressed and unstressed syllables in this line:

    The sun should drop its greatest gold

  88. Which statement is true?

    A. Every rational number is a square root. B. Every irrational number is a fraction. C. Every rational number can be written as a fraction. D. Every square root can be written as a whole number I go with C

  89. How many grams of lithium hydroxide are needed to remove 920 g of carbon dioxide in the air

  90. At a popcorn factory, for every kilogram of popcorn that is popped, 100 grams are not popped. The factory pops 5 kilograms every day. What is the total weight in kilograms, of the unpopped corn in the month of april?

  91. The question is as follows:

    went wrong, I'd really appreciate it!

  92. What courses should you take in each grade 9,10,11,12 to help you become a pharmacologist. i need courses for each grade

  93. what is the vascular system of the lilac flower. i tried finding some sites.

    some sites would help me. PLease!

  94. Describe the vascular system and functions of each component of the Lilac flower

    i tried to find some sites, but i cant find in any. So any sites would help as well

  95. need help on a lab

    here are the results Mass of empty beaker and glass rod(62.62) Mass of beaker, glass rod, hydrated copper sulfate(66.02) Mass of beaker, glass rod and anhydrous copper sulfate(65.04) Mass of hydrated copper sulfate(3.4) Mass of anhydrous

  96. So I did a lab determining the chemical formula of a hydrate. I really just need somebody to check this over for me. We had to find the molecular formula of a hydrate of copper (2) sulphate, CuSO4 .xH2O. My observation table looks like this:

    Mass of clean,

  97. A generic solid, X, has a molar mass of 77.7 g/mol. In a constant-pressure calorimeter, 31.2 g of X is dissolved in 289 g of water at 23.00 °C.

    The temperature of the resulting solution rises to 24.40 °C. Assume the solution has the same specific heat as

  98. Displacement vectors A,B,and C add up to a total of zero. Vector A has a magnitude of 1550 m and a direction of 24.1° north of east. Vector B has a direction of 41.0° east of south, and vector C has a direction of 33.4° north of west. Find the

  99. The heart is a _____ that provides the force necessary to circulate the blood to all the tissues in the body.

    A. Skeletal pump B. Autonomous pump C. Muscular pump D. Systemic pump My answer would be C. i think that's right...

  100. What is the acceleration of a car going from 3.0 x 101 km/hr to 1.20 x 102 km/hr in 3.0 x 101 sec?

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