1. math

    If you borrow $15,000 from your dad for college and you agree to pay him $25,000 back at 8% compound interest per year. How many years do you think you have to do this? In other words, given the amounts and the interest rate, what is the number of years?
  2. Chemistry

    I want to see if i got my answer correct for #1 but I need help on #2 1.A 150g aluminum pan containing 500g of water is heated on a stove for 5 minutes. The temperature goes from 23.5C to 48.9C. How much heat was absorbed. (s for Al is .900j/g C, s for H2O
  3. Chem

    I want to see if i got my answer correct for #1 but I need help on #2 1.A 150g aluminum pan containing 500g of water is heated on a stove for 5 minutes. The temperature goes from 23.5C to 48.9C. How much heat was absorbed. (s for Al is .900j/g C, s for H2O
  4. Chemistry

    Solid NaI is slowly added to a solution that is .010M in Cu+ and .010M in Ag+... a.) which compound will precipitate first b.) calculate [Ag+] when CuI just begins to precipitate c.)what % of Ag+ remains in solution.
  5. Chemistry

    The structure of Crestor (rosuvastatin), a medication used to reduce cholesterol, is shown below. If the specific rotation for this compound is known to be +100, what would be the specific rotation for the stereoisomer shown at the right?
  6. science(chem)

    UV I was just wondering how a solvent would affect the spectra of a compound. Like a polar or nonpolar solvent for example: polar: Methylene chloride Nonpolar: cyclohexane, hexane, or ethanol Thanks
  7. Chem

    Which of the following pairs of elements are likely to form an ionic compound? lithium and chlorine sodium and potassium phosphorus and chlorine sodium and nitrogen argon and potassium
  8. chemistry

    Calculate the molarity of each ion in 0.300 M Na2SO4. Enter a zero for an ion that doesn't occur in the compound. ______ M Na1+ ______ 2 M S2- ______ 3 M O 2- ______ M SO42-
  9. CHEMISTRY

    A solution contains 10.05 grams of an unknown covalent substance in 50.0 grams of water. The freezing point of this solution is (-) 3.16o C. What is the formula weight of the unknown compound?
  10. Chemistry

    Could you please explain how electronegativity works and how you find the total electronegativity value of PO3 K2O H2S GIVEN: P- 2.1, O-3.5, K- 0.8, H- 2.1, and S- 2.5 Also how to you tell if the compound is ionic, polar covalent, or non polar covalent?
  11. Chemistry

    What is a cathode and an anode? In the formula for table salt: NaCl, which part of the compound is a cathode and which part is the anode? ****** I don't get any of this stuff!?! D: Due tomorrow!! ))):
  12. math

    A certain sum is deposited in a bank which gives compound intrest at certain rate. The intrest on the amount is rs.440. In the first 2 years and rs.728 in the first 3 years what is the rate of interest per annum.
  13. Chemistry

    Could you please explain how electronegativity works and how you find the total electronegativity value of PO3 K2O H2S GIVEN: P- 2.1, O-3.5, K- 0.8, H- 2.1, and S- 2.5 Also how to you tell if the compound is ionic, polar covalent, or non polar covalent?
  14. Chemistry

    2KMnO4(aq)+16HCl(aq)->2MnCl2(aq)+5Cl2(g)+8H2O(l)+2KCl(aq) A.)the volume of 0.414 M KMnO4 needed to produce 1.66 mol MnCl2 B.) the volume of 2.15 M HCl needed to produce 112 mL of 0.618 M KCl C.)the molarity (M) of the HCl solution when 26.42 mL react with
  15. Chemistry

    Balance the reaction of plumbate ions and hydrochlorite ions: Pb(OH)42-(aq) + ClO-(aq) → PbO2(s) + Cl- I put: Pb(OH)3-(aq) + ClO-(aq) → PbO2(s) + Cl-(aq) + H2O(l) + OH-(aq) It said: The reaction described in your answer is not balanced. One or more of
  16. Business Statistics

    Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits. Calculate the mean of the 20 samples Draw a
  17. Chem

    Ammonium bromide is a crystalline solid that decomposes endothermically when heated. The reaction is NH4Br(s) NH3(g) + HBr(g). When solid ammonium bromide is added to an evacuated flask at 300°C, which change in reaction conditions below will cause the
  18. chemistry help plz

    benzene ring-N-H-CH3 H \ N-benzene ring / CH3 select the class of compound from the choice below. 1-acetal 2-alcohol 3-alkene 4-amide 5-amine 6-carboxylic acid 7-ester 8-haloalkane
  19. Eng 2

    Which sentence has a compound predicate with a direct object? a) Anne backes cakes and cookies. b) Anne loves to bake cakes. c) Anne took baking classes d)Anne baked a cake and ate it
  20. chemistry

    Iodine(I2)is a solid molecular compound at room temperature. Predict its solubility in liquid water(H2O)and in liquid cyclohexane(C6H12) at room temperature respectively and provide explain for your answer.
  21. Science --HELP PLEASE

    I need to write a hypothesis for a lab ex. I think that ionic compounds will be soluble in water because the polar molecules in H20 cause the compound to break apart and dissolve in the water. but another part is the appearance of ionic and covalent
  22. science

    transmission electron microscope compound (light) microscope scanning electron microscope field scope dissecting microscope Arrange the five types of microscopes in order from lowest resolution to highest.
  23. Chem

    If 0.256 g of a compound containing only carbon and hydrogen atoms is burned efficiently and 0.780 g of carbon dioxide and 0.356 g of water are produced, how many moles of H-atoms are contained in the original (0.256 g) sample?
  24. science

    Which of the following has a boiling point which does not fit the general trend. NH3 PH3 SbH3 AsH3 I am going with NH3 as i think its to do with "the larger the compound the greater the boiling point"(Vander waals forces) Am I correct?
  25. science

    transmission electron microscope compound (light) microscope scanning electron microscope field scope dissecting microscope Arrange the five types of microscopes in order from lowest resolution to highest.
  26. Chemis

    Of the floowing compound, which would you exoect to have the lowest vapor pressure at room temperature: CHCl3 CH2Cl2 CH3Cl CCl4 From my result I think it is CH3cl beacuse of the dispersion force it has the lowest force
  27. grammar

    How to fix this sentence fragment. Richard III supposedly had the young princes murdered. Found out what really happened to them. I would make it into a compound sentence. Put a semicolon after murdered; and add "no one has" before the found.....etc.
  28. A-Level Chemistry

    How many alcohols (including both structural isomers and stereoisomers) can have the molecular formula C4H10O I know what structural and stereoisomers are but i want to know that whats the method to find the total number of isomers of this compound.
  29. chemistry

    when aqueous solutions of sodium carbonate and manganese(V) chloride are mixed, a precipitate forms. The precipitate is a compound containing manganese. I have to write the chemical, complete ionic, and net ionic equations for it.
  30. Chem

    The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole
  31. Chemistry please help

    The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole
  32. Chemistry please help!

    The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole
  33. chemistry

    if 2.0 grams of sodium sulfate are mixed with 2.0 grams of calcium chloride to produce calcium sulfate as a precipitate, which compound is the limiting reactant
  34. grammar

    in this sentence local government and citizen groups often employ city planners. do you underline local government and citizen for compound subjects
  35. algebra

    A roast chicken is done with the temperature of the thigh meat is between 165 and 175. Write a compound inequality to represent the temperature at which a roast chicken is done.
  36. Chemistry

    Calculate the normal boiling point of a compound that has a vapor pressure of 19.30kPa at 167 Fahrenheit and a vapor pressure of 1.86kPa at 77 Fahrenheit.
  37. Chemistry Re-Post Please Help

    We did a lab on fractional distillation and I am unsure what the three fractions were. I think the first one is ethanol, and the third one is water, but I'm unsure what the middle one is. Would it be an ethanol/water compound? What do you think it would
  38. Chemistry

    A particular oral contraceptive contains 0.041 mg of ethinyl estradiol in each pill. The formula of this compound is C20H24O2. How many moles of ethinyl estradiol are there in one pill? I need help in approaching this
  39. Chemistry

    We did a lab on fractional distillation and I am unsure what the three fractions were. I think the first one is ethanol, and the third one is water, but I'm unsure what the middle one is. Would it be an ethanol/water compound? What do you think it would
  40. Chemistry

    I am stuck on b)... Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the
  41. Chemistry

    a redox reaction is a reaction in which 1.only reduction occurs 2.only oxidation occurs 3.reduction&oxidation occur at the same time 4.reduction occurs first and then oxidation occurs i think its 3 or 4.
  42. Chem

    1) Mg + F2 = MgF2 10.00 grams of magnesium reacted with fluorine to produce MgF2 Find : a) Balance the reaction b) How many grams of fluorine reacted with magnesium. Answer:____________ c) How many grams of MgF2 were formed in the reaction.
  43. chemistry

    a compound made in the first part of an experiment, [Co(NH3)5Cl]Cl2 appeared to be a dark brown/orange/purple color. This product was then used as a reactant to synthesize [Co(NH3)5ONO], which was a red color. how do you account for the differences in
  44. 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
  45. Chemistry

    You and another student were each given an unknown compound. Both samples contained colorless material. You each used the same brand of commercially prepared TLC plate and developed the plates using the same solvent. Each of you obtained a single spot of
  46. Chemistry - Gravimetry

    A commercial algaecide containing an organocopper compound was treated with concentrated nitric acid and evaporated to dryness. After dissolution of the residue, the copper was precipitated with -benzoin oxime. If the sample weighed 15.443 g and the
  47. chemistry

    Calculate the molecular formula of nicotine (CxHyNz, xyz being unknown)if 4.38 mg of this compound burns to form 11.9 mg of carbon dioxide and 3.41mg of water, and 3.62 g of nicotine changes the freezing point of 73.4g of water by .563C. Show all work. I
  48. Chemistry

    An unknown compound analyzes to be 42.85% C, 7.20% H, and 49.95% N. A 0.915 g sample of the gas occupies 250. mL at 760. mm Hg and 100.°C. Type your answers using the format CH4 for CH4. Enter the elements in the order given. I have calculated the
  49. Chemistry

    Underground miners formerly used headlamps in which calcium carbide (CaC2) was reacted with water to form acetylene (C2H2) gas as shown in the following reaction: CaC2(s) + H2O (l) ---> C2H2 (g) +Ca(OH2)(s) The acetylene produced was then burned to produce
  50. Chemistry

    A saturated solution of a certain metal(II) chloride has a chloride ion concentration of 0.032M. The Ksp for this compound can be determined to be is? This is similar to another question I posted that gave the Ksp and I had to find the pH. I am not sure
  51. chemistry

    A 2.00 g sample of a particular compound was dissolved in 15.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85ºC. For pure CCl4, TB = 76.50ºC and KB = 5.03°C·kg/mol Calculate the boiling point elevation, ΔTB,
  52. Chemistry 151

    A minimum energy of 225 kJ/mol is required to break a certain chemical bond in a compound. What is the longest wavelength of radiation (in nm and angstroms, Å; 1 Å = 10−10 m) necessary to break the bond? In which region of the electromagnetic spectrum
  53. Chemistry

    2 B5H9(l)+12 O2(g)---->5 B2O3(s)+9 H2O(l) Calculate the kilojoules of heat released per gram (kJ/g) of the compound reacted with oxygen. The standard enthalpy of formations of B5H9(l), B2O3(s), and H2O(l) are 42.84, -1271.94, and -285.83 kJ/mol,
  54. chemistry

    I don't understnad why I got this question worng: The question asks given the following solubilities, calculate the value of the Ksp for the compound: Zinc carbonate, 3.87 x 10^-6 mol/L My answer: AnCO3 -----> Zn + CO3 There exists a 1:1 ratio between Zn
  55. Personal Finance

    Suppose you buy a two-year CD for $10,000 from First Command Bank. Assume monthly compounding. Use the APR from the below Table 4.1 and the compound interest formula to determine how much interest the CD earns for you at maturity. The Table says APR is
  56. Chem

    A compound that dissolves in water to form an aqueous solution that is an excellent conductor of electricity is always present in the solution as -covalent molecules -acid molecule -base molecule -salt molecules -ions
  57. Chemistry

    Which of the following would involve the largest production of heat per mole? a)the burning of gasoline b)the evaporation of water c)the fission of uranium d)the freezing of water e)the rusting of iron Is it C) Which of the following would involve the
  58. English please help

    5. The Statue of Liberty has stood FOR MORE THAN 100 YEARS in New York Harbor. adverb phrase** adjective appositive phrase adverb 6. Frédéric Bartholdi, THE SCULPOTOR, came up with the concept of a “mighty woman with a torch” as he sailed into the
  59. Science

    Suppose that you heated a sample of a hydrated ionic compound in a test tube. What might you expect to see inside the test tube, near the top of the test tube? Explain please i really am stumped on this question...
  60. Chemistry

    When 0.689 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 11.2C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to
  61. chem

    Fluorine and krypton react to form binary compounds when a mixture of the two gases is heated to 500C in a nickel reaction vessel. A 100mL nickel container is filled with fluorin and krypton to partial pressures of 1.24 atm and 10.10 atm, respectively at a
  62. Chem

    A carless chemistry student pours 200 grams of methanol, a flammable substance into the sink. Another careless chemistry student causes the bad situation to get even worse by dropping a lit match into the sink. The metanol burns completely with 300 grams
  63. Chemistry

    Of the compounds below,_____ has the smallest ionic separation and why? A.RbF B.K2S C.SrBr2 D.KF E.RbCl --> How does one determine if a compound has a high or low ionic separation, and what is ionic separation?
  64. Chemistry

    Of the compounds below,_____ has the smallest ionic separation and why? A.RbF B.K2S C.SrBr2 D.KF E.RbCl --> How does one determine if a compound has a high or low ionic separation, and what is ionic separation?
  65. Chemistry

    When one mole of ammonia is heated to a given temperature, 50% of the compound dissociates and the following equilibrium is establised. NH3(g) 1/2N2(g) + 3/2H2(g) (note: is my sad attempt at the equilibrium symbol) What is the total number of moles of gas
  66. ENGLISH

    Which of the following is an example of a compound sentence? A. Because the weather was so nice,we decided to take the day off from work. B. There are five players on the court for each basketball team at any given time:two guards, two forwards, and a
  67. AP Chem

    The formula for epson salts is MgSO4*7H2O. If 1.250 g of the compound is dissolved in water, calculate the number of milliliters of 0.200 M Ba(NO3)2 that would be required to precipitate all of the sulfate ions as barium sulfate. Make the same
  68. CHEMISTRY

    The equilibrium constant for the reaction, SO2(g)+ NO2(g) NO(g)+ SO3(g) has been experimentally determined as a function of temperature. The results are presented in the table below. T (°F) KC 285 662 752 156 842 93.4 932 59.6 1022 40.2 If 0.0791 ft3 SO2,
  69. Chemistry

    Chemistry equilibrium? Consider the reaction 2NO(g) + O2(g) = 2NO2(g) at 430C an equilibrium mixture consists of 0.020 mole of O2, 0.040 mole of NO, and 0.96 mole of NO2. Calculate Kp for this reaction given that the total pressure is 0.20 atm. I used
  70. to kill a mockingbird

    what is the moment where boo radley and miss maudie BRING at reaction from Scout?? i Don't get the questions !!do we have to explain the moment when scout reacts toward to Boo radley and miss maudie? can i answer it like this: the moment where Boo radley
  71. Stoichometry

    Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 0.55 mole of sodium carbonate is mixed with one containing 0.55 mole of silver nitrate. After the reaction is
  72. Chemistry

    Currently studying for an lab exam. Just have a few question about a typical Iodine Clock reaction lab. In an typical Iodine Clock reaction lab what would be the state of effect of an increase in the initial concentration of persulfate ion and the increase
  73. Science (optics & waves)

    A compound microscope has lenses of focal length 1.0cm and 5.0cm from the objective. if the final image is formed at the least distance of distinct vision from the eyepiece, calculate i. the separation of the objective and the eyepiece. ii. the angular
  74. math

    A company will need $30,000 in 7 years for a new addition. To meet this goal the company deposits money in an account that pays 7% anual intrest compound quarterly. Find the amount that should be invested to reach $30,000 in 7 years?
  75. Chemistry

    Samples of three different compounds were analyzed and the masses of each element were determined. Compound Mass Mass N(g) O(g) A 5.6 3.2 B 3.5 8.0 C 1.4 4.0 If you were John Dalton and had never heard of a mole, which of the following would you think were
  76. Chemistry

    Complete the table by filling in the formula for the ionic compound formed by each pair of cations and anions, as shown for the first pair. Ion K+ NH+4 Mg2+ Fe3+ Cl- OH- CO3 2- PO3- 4 Complete the fourth row of the table.
  77. chemistry

    The organic compound di-n-butyl phthalate, C16H22O4(l), is sometimes used as a low-density (1.046 g·mL–1) manometer fluid. Compute the pressure (in torr) of a gas that supports a 585-mm column of di-n-butyl phthalate. The density of mercury is 13.53
  78. English Writeacher

    I want to thank you for advice and help in my English course. On my 9 page final I missed 7 questions, but what was so bad it was on complex and compound complex sentences my weakness I knew. I made 93 on final. I have a 96.83 grade average for course.
  79. Science-Chemistry

    A student has blocks of four different materials of identical mass. The materials are ice, gold, aluminum, and Styrofoam. Which blocks would have the largest volume? Would it be gold? Also this other question: What is the total number of atoms in a single
  80. chem

    Excess fluorine, F2(g), reacts at 150°C with bromine, Br2(g), to give a compound BrFn. If 423 mL Br2(g) at 150°C and 748 mmHg produced 4.20 g BrFn, what is n? Predict the shape of this molecule using the VSEPR model.
  81. English

    Identify the choice that best describes the word "report" Carlos wrote a report about modern foods for his social studies class. common noun*** proper noun compound noun collective noun *** - My Answer
  82. Maths

    Suppose you were to leave $100 to be equally divided between your great great grandchildren 100 years from now. Given that you can secure annual interest at 6% pa, what would this amount be? Find the compound interest, compounding monthly? Please show all
  83. maths

    A man borrows Rs 18000 at 5% per annum compound interest .If he repays Rs 6000 at the end of the first year and Rs 8000 at the end of the second year; how much should he pay at the end of the 3rd year in order to clear the account?
  84. Chemistry 12

    name a compound that acts as a weak base? methanol? define the term weak bronsted-lowry base im not sure how to put this in words, but a weak base is found when you got a strong acid, when your ka is high, kb will be low.
  85. chemistry

    An analysis for copper was performed on two pure solids. One solid was found to contain 43.0% copper; the other contained 32.0% copper. Could these solids be samples of the same copper-containing compound? Please help.
  86. chemistry

    i read in my chem book, it says that SiH4 is molecular compound but SiO2 is covalent network, but why not SiH4 since it has Si which can form network covalent as well?
  87. chemistry

    An organic compund has a molar mass of 178.3g/mol and contains 7.29% hydrogen atoms by mass. How many hydrogen atoms are in each molecule of this compound
  88. science

    An analysis for copper was performed on two pure solids. One solid was found to contain 43.0% copper; the other contained 32.0% copper. Could these solids be samples of the same copper-containing compound?
  89. english

    I am looking for a word, that when added to each word in this group of words(hand, lithe, and win) forms a compound word ? What word works with all three words???
  90. Chemistry

    BaSO4(s)__>
  91. Chemistry

    An indicator is what type of compound? a. reducing agent b. oxidizing agent c. weak base or acid d. strong base or acid
  92. finance

    I would like to enquire if you could help with the following assignment question. The exact assignment question is: Explain how an investor or analyst should analyse a company's financial statements in order to gain the maximum insight for valuation
  93. Chemistry

    What should be the pH value of the solution to double the solubility of the ionic compound NX? Ka of HX=2*(10)^-5 M My thoughts on the question: Let the solubility of NX=x M 1) NX(s) N+(aq) + X-(aq) eq:con: x x (moldm-3) X^- HX + OH^- -->(2) HXH^+ + X^-
  94. Chemistry

    Which reaction below represents the second ionization of Lr?
  95. physics

    What does it mean when they say that action equals reaction?
  96. chemistry

    A salt is obteind as a reaction between
  97. chemistry

    what type of reaction is Al+S8=Al2S3
  98. chemistry

    Provide an example of a spontaneous reaction
  99. chemistry

    Why is respiration an exothermic reaction?
  100. biology

    What will happen to the reaction without an enzyme?