1. Chemistry (Check)

    Nitrogen combines with oxygen to form a variety of compounds. One of these compounds is called nitrous oxide or "laughing gas." What is the formula of nitrous oxide if this compound is 63.65% N and 36.35%O by weight? I got N2O
  2. 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?
  3. 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
  4. 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 compounds help please!!
  5. 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.
  6. 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.
  7. 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.
  8. College Chemistry

    A gas containing carbon and hydrogen analyzed as 85.6 % carbon and 14.4 % hydrogen. A 42.1 g sample of a gas occupied a volume of 7490 mL with a pressure of 2280.0 torr at 92 °C. Enter the molecular formula of the compound. Thanks.
  9. organic chem

    7. An unknown compound, C8H14, is optically active. Hydrogenation of the unknown yields 4-methylheptane. Ozonolysis of the unknown yields ethanol and 2- methylpropandial. Suggest a structure for the unknown consistent with the above date. please help
  10. 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.
  11. 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 surroundings), ...
  12. Chemistry

    The hydroxide ion reacts with the H2PO2 ion according to the following equation: OH^- + H2PO2^- > HPO2^-2 + H2 The rate law for this reaction rate is R=k[OH^-]^2[H2PO^-2]. What will be the change in the reaction rate if the H2PO2 ion concentration is doubled. What will the ...
  13. 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 a very bright ...
  14. Chemistry

    out of these conditions, which would result in fastest reaction? a. 2.0M HCL, powedered CaCO3 chip, 50 degrees celsius b. 6.0M HCL, CaCO3 chip, 25 degrees celsius c. 6.0M HCL, powdered CaCO3, 50 degrees celsius. d. 2.0M HCL, CaCO3 chip, 50 degrees celsius. Im guessing C ...
  15. 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?
  16. 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?
  17. chemistry

    Ethylene glycol, HOCH2CH2OH, is used as antifreeze. It is produced from ethylene oxide, C2H4O, by the following reaction. C2H4O(g) + H2O(l) → HOCH2CH2OH(l) Use Hess's law to obtain the enthalpy change for this reaction from the following enthalpy changes. 2 C2H4O(g) + 5 ...
  18. Chemistry

    Ethylene glycol, HOCH2CH2OH, is used as antifreeze. It is produced from ethylene oxide, C2H4O, by the following reaction. C2H4O(g) + H2O(l) → HOCH2CH2OH(l) Use Hess's law to obtain the enthalpy change for this reaction from the following enthalpy changes. 2 C2H4O(g) + 5 ...
  19. Math 140

    To help pay for a class trip at the end of the senior year, the junior class at a high school invests $1800 from a fund-raiser in a 18-month CD paying 2.6% interest compound monthly. Determine the amount the class will receive when it cashes in the CD after 18 months.
  20. chemistry

    Are these physical property's of a pure compound? What are physical properts off this list???? molar weight reactivity with halogens volatility melting and boiling points hardness, brittleness odor density air sensitivity flammability radioactivity colour toxicity chemical ...
  21. 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...
  22. 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 greatest absorption of ...
  23. Chemistry

    If delta H°rxn and delta S°rxn are both positive values, what drives the spontaneous reaction and in what direction at standard conditions? The spontaneous reaction is a)enthalpy driven to the left. b)entropy driven to the right. c)entropy driven to the left. d)enthalpy ...
  24. 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 histogram showing the ...
  25. 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 significant figures. Do not ...
  26. 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 room temperature of ...
  27. Organic Chem I Lab

    I had to react 1-propanol with NaBr and H2SO4. I refluxed for one hour and when attempting to separate out the product (product was supposed to be 1-bromopropane) via sep funnel either could no longer distinguish between the organis layer and the aqueous layer, or there was ...
  28. science

    2mL of a 10M solution of Compound A is taken and 48mL added. 1mL of this solution is then taken and dried to dryness before being re-dissolved in 0.1mL. What is the concentration of the 0.1mL solution?
  29. chemistry

    2. 2mL of a 10M solution of Compound A is taken and 48mL added. 1mL of this solution is then taken and dried to dryness before being re-dissolved in 0.1mL. What is the concentration of the 0.1mL solution?
  30. 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
  31. 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, respectively.
  32. 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 how to start this ...
  33. math (steve for your help)

    0.224g sample the contained only bacl2 and kbr required 19.7ml of 0.1M agn03 to reach the end point. Calculate the percent of each compound present in the sample. Steve want you step by step for me.
  34. 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
  35. 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 and CO3 Ksp = (3.87...
  36. 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. Response will be appreciated.
  37. 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, for this solution.
  38. 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 harbor. infinitive ...
  39. MATHS 2

    If x+y=45°, prove that {(cotx+1)(coty+1)}/{cotx×coty}=2 Please help me in this TRIGONOMETRY problem. From the topic - TRIGONOMETRY Ratios of compound angles
  40. geometry

    Write the compound statement in symbols Let r= The food is good p= I eat too much q= I'll exercise If the food is not good, I won't eat too much.
  41. chemistry

    1.30 grams of chromium reacts with 9.5 grams of iodine. What is the percent of chromium in this compound? How do I work out this answer. I know answer is 12.02, but can figure out how to get it! Thanks!
  42. math

    A sum of money invested at compound interest amounts to Rs.4,624 in 2 years and to Rs.4,913 in 3 years. The sum of money is:
  43. geometry

    Write the compound statement in symbols Let r= The food is good p= I eat too much q= I'll exercise If the food is not good, I won't eat too much.
  44. 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 of oxygen from the air...

  46. Chemistry

    Does Pb(NO3)2 + Cu has a reaction? if so, what will it be?
  47. chemistry

    if [NO]=2M , [N2] = 1M, and [O2]= 1M, is the reaction at equilibrium?
  48. Chemistry

    E(V) for half reaction 3N(-1/3) -> 3 N(0) + e-
  49. chemistry

    how do you find the Kc of a reaction?
  50. Chemistry

    What are the changes associated with a chemical reaction?
  51. science

    what is an example of a chemical reaction.

    What is reaction between HI+HNO3
  53. chemistry

    The nuclear reaction Sn ¨ Sb + ? is an example of
  54. Biochem

    You wish to measure the ∆G°' for the hydrolysis of ATP: ATP --->ADP + Pi But the equilibrium for the hydrolysis lies so far toward products that analysis of the ATP concentration at equilibrium is neither practical or accurate. However, you have the following data ...
  55. Corrected Temperature Problem

    Q: The activation energy of a certain reaction is 32.9 kJ/mol At 25 degrees C the rate constant is 0.0160 units s-1 units. At what temperature in degrees Celsius would this reaction go twice as fast? My work: ln(0.0160/0.032) = (32,900/8.314)(1/T2 - 1/298.15) -0.6931 = 3,957....
  56. Pre-Algebra

    Sally puts $200.00 in a bank account. This account earns 8% compound interest. How much money is in the account after three years? A $151.94 B $240.00 C $251.94 D $160.00 I really need help on how to solve this, I tried all the stuff I learned this unit, but I can't really ...
  57. 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 color between these two?

    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, 0.158 ...
  59. Chemistry Lab

    So I did a kinetics lab on the rate of reaction of peroxydisulfate ion with iodide ion. Part 1 was the effect of concentration. One of the questions asked is to calculate the amount of thiosulfate consumed in moles. My results for trial 1 were (Times taken for consumption of 1...
  60. science

    Which rate constant would result in the fastest reaction? Which rate constant would result in the fastest reaction? 1 1.3 × 103 L/mol · s 2 2.8 L/mol · s 3 9.5 × 10-2 L/mol · s 4 4.2 × 10-3 L/mol · s
  61. Honors Chemistry

    "How many grams of NH3 can be produced from the reaction of 28 g of N2 and 25 g of H2? N2 + 3H2 ---> 2NH3 ==> 28 g N2 x (1 mol N2/14.0 g N2) x (2 mol NH3/1 mol N2) x ( 17.0 g NH3/ 1 mol NH3) = 68 g NH3 25 g H2 x ( 1mol H2/2.0 g H2) x (2 mol NH3/3 mol H2) x (17 g NH3/2 ...
  62. 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 emperical formula to be CH2N...
  63. Compound Interest!

    Florence can pay her golf membership dues with a single payment of $1500 at the beginning of the year or by paying $770 at the beginning of the year and $810 six months later. What option is to her advantage if she can earn 7% compounded queaterly on short-term loans?
  64. 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 am confused on how to ...
  65. chemistry

    The fictitious compound, pandemonium carbonate Pn(CO3)2 hase a Ksp=3.091×10−9 M3 in water at room temperature. Calculate the solubility of Pn(CO3)2 in an aqueous solution of 1.11 M pandemonium sulfate Pn(SO4)2 (aq). Express your answer in units of molarity.
  66. organi chemistry

    Calicheamicin is an antitumor compound produced by a microorganism isolated in Texas soil. Below is the enediyne core of calicheamicin, which is responsible for its antitumor activity. (a) Mark the hybridization state of each carbon. Ignore the –R groups. (b) What are the ...
  67. 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 Rf=0.75. Were the two ...
  68. chemistry

    An indicator has the reaction Hln(aq) ¡ê H+(aq) + In-(aq). Explain how the indicator can change color when a strong base is poured into a solution of this indicator. Will a strong base dissociate? Which way will this cause the reaction to shift? Is there more or less HIn? Do...
  69. 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?
  70. Compound interest

    Stereo Inc. sells a stereo system for $200 down and monthly payments of $70 for the next 3 years. If the interest rate is 5.25% per year, find: a) The cost of the stereo. Answer = $ b) The total amount of interest paid
  71. 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.
  72. Science

    I need help! What are eight examples of simple machines And eight examples of compound machines I can't think of more right now

    3.) Calculate the mass of oxygen gas that can be produced in the decomposition of 5.55 g of silver oxide. This is what I did but is it right?... I need help with a few more btw to double check if i'm doing these right. So here is what I did: First: balance the equation 2 Ag2 O...
  74. Chemistry

    The experimentally determined rate law for the reaction H2 + NO --> ½N2 + H2O is Rate = k[H2][NO]2. Is the mechanism below possible? Step 1: H2 + NO --> N + H2O Slow Step 2: N + NO -->N2 + O Fast Step 3: O + H2 --> H2O Fast 1. Yes, because the slow step reactants ...
  75. Chemistry

    One of the concerns about the use of Freons is that they will migrate to the upper atmosphere, where chlorine atoms can be generated by the following reaction: CCl2F2 --> CF2Cl + Cl Chlorine atoms can act as a catalyst for the destruction of ozone. The Activation energy for...
  76. 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 g·mL–1.
  77. 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 3.84%
  78. 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.
  79. 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
  80. 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.
  81. 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 possible sets of ...
  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 working out :)
  83. 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?
  84. Dr.Bob, response to your reply to last answer

    Sorry, I didn't see this. Actually you have only one mixture; it happens to have two components. There is a more or less standard procedure for separating complete unknowns (that's where you know nothing about it) and if you know nothing about it that is where you start. You ...
  85. health

    How dose lock-and-key mechanism relate to hormones? A. If a hormone fits the receptor site, then there is no reaction. If a hormone and a receptor site do not match, then there will be an effect. B. If a hormone fits the receptor site, then there will be an effect. If a ...
  86. 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 purposes>Your discussion...
  87. 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 ...

    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 center. C.She bought me a...
  89. Chemistry

    Please help me verify: The following reactions are involved in the formation of acid rain. Use oxidation numbers to identify which of these reactions are REDOX reactions. a. 2SO2(g) + O2(g) �� 2SO2(g) -2 -2 0 -2 -2 No change - not REDOX reacton b. 3NO2(g) + H2O(l...
  90. chemistry

    Sulfur and chlorine can react together to form S2Cl2. When 1.00g of this sulfur chloride reacted with water, 0.36g of a yellow ppt of sulfur was formed together with a solution contianing a mixture of sulfurous acid, H2SO3, and HCl acid. Use the above data to deduce the ...
  91. Chem Extraction of Caffeine from Tea

    When doing your extraction you were asked to vent your extraction funnel occasionally during the extraction. Why? You were instructed not to shake the extraction layers too vigorously. Why? What type of compound could cause the layers not to separate cleanly? Thanks!
  92. 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 determination for 1.000 g of alum...
  93. Chem 100 Lab

    A black solid is heated in a tube that is completely evacuated of air. Hydrogen is added to the tube. An orange powder is formed and water vapor is seen on the outside of the tube. Is the original solid an element or compound? Can you identify the chemical?
  94. 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) HX<...
  95. Language Arts

    Join each pair of simple sentences to form a compound sentence. Use the conjunction that makes sense (and, but, or or) Put a comma before the conjunction. Write the compound sentence on the lines. 1. Julia loves sports. She cannot decide which one to try first. Answer: Julia ...
  96. Biochemistry

    You wish to measure the change in G°'for the hydrolysis of ATP: ATP ---> ADP + Pi but the equilibrium for the hydrolysis lies so far toward products that analysis of the ATP concentration at equilibrium is neither practical nor accurate. However, you have the following ...
  97. chemistry(just need to clarify, no need to solve)

    When a sample of NO2(g) (5.641 mol) is placed in 360.0 L reaction vessel at 716.0 K and allowed to come to equilibrium the mixture contains 3.412 mol of NO(g). What is the equilibrium concentration (mol/L) of NO(g)? When a sample of PCl5(g) (1228 grams) is placed in 270.0 L ...
  98. Chemistry - Equilibrium

    Can anyone find out if I did it right or not? Thanks A 0.682?g sample of ICl(g) is placed in a 625?mL reaction vessel at 682 K. When equilibrium is reached between the ICl(g) and I2(g) and Cl2(g) formed by its dissociation, 0.0383 g I2(g)is present. What is Kc for this ...
  99. Chemistry

    In a study of the following reaction at 1200K it was observed that when the equilibrium partial pressure of water vapor is 15.0 torr, the total pressure at equilibrium is 36.3 torr. 3Fe(s)+4H2O(g) (reversible arrows) Fe3O4(s)+4H2(g) Calculate the value of Kp for this reaction ...
  100. chemistry

    CH3-C(Cl)(C2H5)-CH(CH3)-C(NH2)(Br)-CH2-CH2-C(CH3)3 IUPAC name of this compound
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