1. Organic Chemistry

    Use the data below from an electron impact mass spectrum of a pure compound to deduce its structure. Mass Spectrum M/z Relative intensity 66 32 64 100 49 26 29 72 28 83 27 60
  2. rf factor and compounds

    what does low and high rf factor mean, in compound polarity of its functional groups? Does having a certain kind of functional group increase rf factor, and some decrease? Can someone explain this to me please, with an example. Thank you :)
  3. Chemistry

    I'm having trouble giving the formula for this coordination compound: sodium diamminetetrachloroplatinate(IV) I think that it has to have a charge because it has Na+ and [Pt(NH3)2Cl4] (which is neutral), but Na[Pt(NH3)2Cl4]+ is wrong. Please help!
  4. Chemistry

    I do not understand resonnance structures. is there only resonnance when theres a single pair or could one compound be drawn a couple times once with only single and another time with double bonds?
  5. math

    if I deposited $100 in your savings account today, how much will you have 10 years from now if your account pays compound intrest once a year and the annual intrest rate is 4%
  6. Economics

    Find the future value one year from now of a $7,000 investment at a 3% annual compound interest rate. Also calculate the future value if the investment is made for 2 yeaars?
  7. chemistry

    N2(g) + 3 F2(g) → 2 NF3(g) ΔH° = –264 kJ/mol ΔS° = –278 J/(mol∙K) a. Using the information provided above (only), calculate the maximum amount of non-PΔV work that can be accomplished through this reaction at a temperature of 500°C. b.
  8. science urgent

    how does Nacl use electrons to make a bond. (ionic compound) how does water use electons to make a bond (covalent compund)
  9. MATHS

    Ruby invested an amount of Rs. 5,800 for 2 years. At what rate of compound interest will she get an amount of Rs. 6394•5 at the end of two years ?
  10. chem 101

    A hydrocarbon gas contains 92.26% carbon and 7.74% hydrogen, by mass. At one atmosphere pressure and 25°C, 4.20 L of the gas has a mass of 4.47 g. What is the molecular formula for the compound?
  11. Math

    Money invested in compound interest amount to rs 27783 in 3 years and rs 26460 in 2 years what is the rate percent of interest ?
  12. Chemistry

    How many moles of compound are present in 17g of Fe2O3? I think I know how to do this, so if someone can show me so I can check my work against it. My answer was .106 moles of Fe2O3.
  13. Chemistry

    A compund containing elements A and B has the formula A3B. If a jar containing 100 molecules of the compound A3B, how many atoms of type A are in the jar?
  14. physical science

    As the number of carbon atoms in the compound increases, what pattern do you see in the boiling points? What general pattern do you see in the melting points?
  15. chemistry

    name the following compounds and tell what type of compound they are (binary ionic, ternary ionic or binary molecular) FeBr3, b) CBr4 and c) Na2Cr2O7
  16. chemistry

    the mass of 2.50 mol of a compound with the formula ECl4, in which E is a nonmetallic element, is 385g. what is the molar mass of Ecl4? what is the identity of E?
  17. chemistry

    name the following compounds and tell what type of compound they are (binary ionic. ternary ionic, or binary molecular) a)FeBr3 b)CBr4 c)Na2Cr2O7
  18. chem

    name the following compounds and tell what type of compound they are (binary ionic. ternary ionic, or binary molecular) a)FeBr3 b)CBr4 c)Na2Cr2O7
  19. algebra

    Could you please help? What are the solutions of the compound inequality? 2x - 2 < - 12 or 2x+3 > 7 Is this one x < - 5 or x> 2 2x -1/3 +3 = 6. This one is 2x-1 divided by 3 plus 3 is less than or equal to - 4 or 8x -2 divided by 2 minus one is greater or
  20. math modeling

    Determine the annual interest rate r required for an investment with continuous compound interest to yield an effective rate of 9.94%.
  21. chemistry

    the mass of 2.50 mol of a compound with the formula ECl4, in which E is a nonmetallic element, is 385g. what is the molar mass of Ecl4? what is the identity of E?
  22. Maths ,science

    Bongiwe invests R12000 in a savings account at 6,5% per annum compound interest.Calculate how much there will be in the savings account after 5 years
  23. Science- Chemistry

    Could someone please explain a few things? First off, how do you change a normal compound or element and change it to an ion? And second, could you please explain the net ionic equations?
  24. chemistry

    given 0.0450 M ca(no3)2 and 0.0350 M fe(no3)2. when i separate them, which compound should be used? Na2co3(aq), Hcl(aq), or naoh(aq)? . and which will precipitate first? I went with hcl, and for question two, fe^2+
  25. Chem

    Consider the following reaction: 6A + 2B 5C + 4D Determine the following rates at a time when the rate of consumption of B is 2.5E-05 M/s. a) rate of consumption of A M/s b) rate of formation of C M/s c) rate of formation of D M/s d) rate of reaction M/s
  26. Chemistry

    Silicon Carbide, SiC, is prepared by heating silicon dioxide in the presence of graphite. Carbon dioxide is the by-product of the reaction. How many grams of silicon carbide can be formed from the reaction of 50.0 grams fo graphite with 50.0 grams of
  27. Chemistry

    According to the following reaction, how many moles of water will be formed upon the complete reaction of 22.6 grams of hydrochloric acid with excess iron(III) oxide? hydrochloric acid (aq) + iron(III) oxide (s)--> water (l) + iron(III) chloride (aq)
  28. Chemistry

    Write the net ionic equation for this reaction occurring in water: Sodium phosphate and calcium chloride are mixed to form sodium chloride and calcium phosphate. 1. No reaction occurs. 2. 2Na3PO4 + 3Ca2+ -> 6Na+ + Ca3(PO4)2 3. 2 PO3−4 + 3Ca2+ ->
  29. Chemistry

    1) Write a balanced chemical equation for the reaction between Cu(NO3)2 * 3 H2O and NaOH. Underline the formula for the precipitate produced by this reaction. (The water of hydration in Cu(NO3)2 * 3 H2O appears as liquid water on the right side of the
  30. Chemistry(Thank you for helping)

    1) Given this data in a study on how the rate of a reaction was affected by the concentration of the reactants Initial Rate, RUN # (A), M (B), M (C), M mol L-1 s-1 1 0.200 0.100 0.600 5.00 2 0.200 0.400 0.400 80.0 3 0.600 0.100 0.200 15.0 4 0.200 0.100
  31. Biomechanics

    A person with a body mass of 65 kg was running over level ground with a strong tailwind, while wearing a 10 kg weighted vest. The tailwind applied a force of 125 N to the runner’s body in the horizontal direction. Early in the stance phase, the runner
  32. CHEMISTRY

    Hello, I am having trouble balancing this redox reaction WITHOUT using the half-reaction method. I believe this is because not all of the elements are in (aq). BrO3-(aq) + N2H4(g) --> Br-(aq) + N2(g) Br is reduced by a factor of 6. N is oxidized by a
  33. chemistry

    My chem book gives me the following Hess' Law example: Mg + 2HCl --> H2 MgCl2 Delta H1 MgO +2HCl --> H2O +MgCl2 Delta H2 H2 + 1/2 O2 --> H2O Delta H3=-68.3kcal The desired reaction is the formation reaction of MgO as follows: MgS +1/2 O2 --> MgO Delta H
  34. math

    Please help I know to figure out simple interest but what is the best way to figure out compound interest example 8,000 invested for one year at 6 % compounded quarterly (with the answer rounded to the nearest dollar
  35. Chemistry

    Rank the compounds by stand molar entropy. F2(g), Ne(g), HF(g) I am a little confused by this question, wouldn't it be ranked by the molar mass of each compound? So, F2(g) is the highest and HF(g) is the lowest in entropy?
  36. Chemistry

    What is wrong with or ambiguous about the phrase "four molecules of NaCl" I really don't understand my textbook says in the back that it is an ionic compound so I guess that its not really a molecule then I don't understand...
  37. Chem!!!:/

    Determine whether of not each compound will be more soluble in acidic soln than in pure water. Explain. A). Hg2Br2 B). Mg(OH)2 C). CaCO3 D). AgI I think acid, neutral,acid,neutral ??? Help please!:) thAnks
  38. chemistry

    A given sample of a xenon fluoride compound contains molecules of the type XeFn where n is some whole number. Given that 9.03 × 1020 molecules of XeFn weighs 0.368 g, determine the value for n in the formula.
  39. chemistry

    Identify common properties of the molecules in a compound with a liquid crystal phase contain ions contain aromatic groups contain polar groups have long molecules
  40. Math

    You invest your $20000 savings in a term deposit for 3 years at 5.5% p.a. compounding monthly. The compound interest formula is A=P(1+r/n)(to the power of)nt Would it be - P=20000 r=5.5 n=12 (months) t=3 (years)
  41. English

    Identify the choice that best describes the word "reassuring" Although I do not pretend to understand the science behind it, this is reassuring to me. adverb*** adjective article compound adjective *** - My Answer
  42. Finance

    Find the future value one year from now of a $7,000 investment at a 3 percent annual compound interest rate. Also calculate the future value if the investment is made for two years.
  43. Chemistry

    There was this problem on a test that I took recently. But, I never learned how to solve this. The problem was: it gave the mass of a certain compound and stated that it had 92% carbon. then it asked for the theortical yield of Carbon.
  44. chemistry

    a sample of compound C,H,N and O with a mass of 0.6216 was found to contain 0.1735g C,0.01455g H,0.2024g N.Its molecular mass 129.calculate its epirical and molecular formulas.
  45. chm

    How would you classify the following material?swimming pool water homogeneous mixture
  46. Chem !!!!!!!!!!!!!!!!

    a) What properties are important for a solvent to be used to extract a compound from an aqueous solution? b) When carrying out an extraction what are the advantages/disadvantages of having your extraction solution more/less dense than water? Thank you!
  47. Physics

    To stop a car, you require first a certain reaction time to begin braking. Then the car slows under the constant braking deceleration. Suppose that the total distance moved by your car during these two phases is 56.7 m when its initial speed is 80.0 km/h,
  48. O-Chem

    A student wished to prepare ethylene gas by dehydration of ethanol at 140 C using sulfuric acid as the dehydrating agent. A low-boiling liquid was obtained instead of ethylene. What was the liquid, and how might the reaction conditions be changed to give
  49. physical

    Consider a compound microscope that has a minimum separation angle of 0.5 ¦Ìrad when it satisfies the ¡®just resolved¡¯ condition. When its objective lens with a circular aperture is immersed in oil whose refractive index is 1.53, determine the
  50. Chemistry

    Name each compound. /\/\NH2 (that's suppose to be a line diagram...) I got 1-pentanamine, but that's wrong. CH3CH2-O-CHCH2CH3 .....................| ..................CH3 I'm not sure how great this will turn out, but there's supposed to be a CH3 branching
  51. Chem Help Please!!!

    for each of the pairs of elements below give the formula for the simplest compound to be formed from them and explain the basis of your decision and note if the bond(s) formed are ionic or covalent. a) silicon and oxygen (SiO2) b) chlorine and bromine
  52. Chem

    When 0.500 g of copper(II) sulfate pentahydrate is heated at a temperature of 300°C for twenty minutes it loses some water of hydration. If the resulting sample weights 0.427 g then what is the formula of the resulting compound? What equation(s) can I use
  53. question on microscope

    "In order, list the lenses in the light path between a specimen viewed with the compound light microscope and its image on the retina of the eye." My son got this question and I cannot make sense of it. Growing up, we didn't have microscopes to use in
  54. Chemistry

    80.0 ml of 1.50 M lead (IV) acetate is added to a 65.5 ml solution of 1.25 potassium chloride. 5.84 grams precipitate are collected. what is the percent yield? Calculate the concentrations of all ions remaining in solution. Okay so I know you have to
  55. chemistry

    For the new compound ICl2F+2: Calculate the maximum wavelength of electromagnetic radiation that is capable of breaking the weakest bond. Express your answer in meters. Bond energies (kJ/mol) are: I-I (150) F-F (160) Cl-Cl (240) unanswered
  56. Algebra

    Using the compound intrest formula's A=P(1+r/n)^nt and A=Pe^rt to solve the problem given. Round the answer to the nearest cent. I have to find the accumulated value of and investment of $20,000 for 6 years at an intrest rate of 4.5% compounded
  57. polymerization of alchohol

    CH2=CH-CH-OH | CH3 when the above compound undergo polymerizaing What is the polymer and the structure of the polymer obtained drawing should show three monomer unit. also include what type of polymerization involved in forming this polymer
  58. Chemistry

    In a particular redox reaction, BrO– is oxidized to BrO3– and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in acidic solution. Two half reactions: 1.) Cu^2+ --> Cu^+ 2.) BrO^- --> BrO3^- Balanced: 1.) Cu^2+ +e^- --> Cu^+
  59. Chemistry

    Upon heating 134 g MgSO4 · 7 H2O: (a) how many grams of water can be obtained? (b) how many grams of anhydrous compound can be obtained?
  60. math

    The difference between compound interest and simple interest on a certain amount for1.5 yes at 12% per annum is ₹ 150.calculate the amount.
  61. Algebra

    Solve. (x+5)(x-3)(x+4) is greater than 0. Use at least one inequality or compound inequality to express your answer. Type R if the answer is in all real numbers.
  62. AP Chem

    Combustion of 6.38 mg of ethylene glycol gives 9.06 mg CO2 and 5.58 mg H20. The compound contains only C, H, and O. What are the mass percentages of the elements in ethylene glycol?
  63. chemistry

    if a barium ions Ca2 plus have a charge of 2 plus and hydroxide ions C11-have a charge of 1-,the compound calcium chloride is
  64. math

    covert the compound statement into words. Let r="the food is good" p="I eat too much" q=I'll exercise." I'll exercise if i don't eat to much. 1.~p^q 2.~(p->q) 3.~p->q 4.~p,q
  65. simple interest and compound interest

    the compound interest on certain sum for the third year and fourth year is rs.1815 and rs 1996.50 respectively. what is the annual rate of interest
  66. Maths

    What simple interest rate is equivalent to a compound interest rate of 6% p.a. over 10 years correct to two decimal places?
  67. Chemistry - Unit Analysis

    The molar mass of cupric chloride is 134.45g/mol. What is the mass, in grams, of 8.19*10^-3 mol of this compound?
  68. english

    Rewrite each run or sentence as two sentences or a compound sentence using and, but , or or. 1. Most fish are about a foot long some fish are giants.
  69. Algebra

    compound inequality write the solution set using interval notation and graph -7x+1>=15 or 5x+3>=-17 -1 -1 -3 -3 -7x/-7>=14/-7 5x/5>=-20/5 x>=-2 x>=-4 {-2,sideways8) {-4,sideways8) On my graph I have a { at -2 Does someone know how to do this?
  70. Chemistry

    Explain trends in the solubility of water (amount of the compound (solute) that will dissolve in a given amount of solvent (water).
  71. chemistry

    substance A has a boiling point of 80 degrees cel and a denisty of 3.5 g/cc. substance A which one; a; might be an element b; must be an element c; must be a compound d; might be a mixture
  72. chemistry

    What is the correct formula for an ionic compound that contains aluminum ions and sulfide ions? The answer is Al2S3. How did they get this answer?
  73. chemistry

    A compound with a formula mass of 42.08 amu is found to be 85.64% carbon and 14.36 % hydrogen by mass. find its molecular formula.
  74. chemistry

    CH3 CH3-C-CH3 CH3CH2CH2-C-CH2CH2CH2CH3 CH3 give the IUPAc name for this compound? is it 4-methyl-4-tert-methyloctane?
  75. Maths

    Difference between the compound interest and the simple interest on a certain sum for 2 years at 6% per annum is rupees 90 .find the sum
  76. Chemistry

    A student mixes 5.0 mL of 0.00200 M Fe(NO3)3 with 5.0 mL 0.00200 KSCN. She finds that the concentration of FeSCN2+ in the equilibrium mixture is 0.000125 M. Follow these steps to determine the corresponding experimental value of Kc for the reaction of Fe3+
  77. Chemistry

    What is the name of the compound NO3. (Not NO3-, nitrate)???? Please help!
  78. chemistry

    name the compound CH3CH=C(CH3)CH(CH3)2.
  79. english

    Is the word Redskins a compound word?
  80. 5th grade

    How do you figure out area of compound figure
  81. chemistry

    what is the name of the compound (cooh)ch=ccl(cooh)
  82. language

    what is a compound predicate????and what is simple predicate??/
  83. Chemistry

    Given the reactant side of the total ionic equation for the neutralization reaction of ammonium hydroxide (NH4OH) with hydrochloric acid (HCl), write the total ionic equation (also known as the complete ionic equation) by entering both the reactant and the
  84. Chemistry

    1.What hydrocarbons generally will undergo an immediate reaction with Br? 2.What hydrocarbons generally will undergo an immediate reaction with KMnO4 Choices for both are Alcohols,Alkanes, Alkenes, Aromatics I think for 1. is at least Alkenes and maybe
  85. chemistry

    According to the following reaction, how many grams of sulfur trioxide will be formed upon the complete reaction of 21.2 grams of oxygen gas with excess sulfur dioxide? sulfur dioxide (g) + oxygen (g) sulfur trioxide (g)
  86. Chemistry

    1.What hydrocarbons generally will undergo an immediate reaction with Br? 2.What hydrocarbons generally will undergo an immediate reaction with KMnO4 Choices for both are Alcohols,Alkanes, Alkenes, Aromatics I think for 1. is at least Alkenes and maybe
  87. Chemistry

    According to the following reaction, how many grams of nitrogen gas will be formed upon the complete reaction of 22.2 grams of hydrogen gas with excess nitrogen monoxide? nitrogen monoxide (g) + hydrogen (g) nitrogen (g) + water (l)
  88. maths

    Compound Interest: You deposit $1000 in an account with an annual interest rate of r (in decimal form) compounded monthly. At the end of 5 years, the balance is A = 1000(1 + (r/12)) ^60
  89. compound sentence

    1.There was no break between the breakfast and lunch crowds, so Zach's first break was around 2:00. 2.Then he made some notes for the owner, Melanie, who was also the cook on the second shift. I think the compound sentence is the 1st sentence
  90. chemistry

    how many carbon particles are there in 4.25 mole of C6 H12 O6? i do not get how to solve this. my teacher said something about conversion factors but i still don't understand how u isolate the carbon from the whole compound. can someone please explain how
  91. Math

    Solve the compound inequality -1 < X - 2 LESS THAN OR EQUAL TO 7 Your problem: -1 < x - 2 ≤ 7 Add 2 to all three quantities to get x by itself: -1 + 2 < x - 2 + 2 ≤ 7 + 2 1 < x ≤ 9 Solution set can be expressed this way using interval notation: (1,
  92. math

    compound intrest- if there was a chart for 10 years of intrest of a student who was paying a loan when would be the best year to increase his constant annual payment by 5000 dollars for just 1 year
  93. Chemistry

    A protein found in some types of wood-rotting fungi is 0.40% copper by mass. Each protein molecule is known to contain 4 copper atoms. What is the approximate molecular weight of this compound?
  94. Chemistry

    Consider 15 mL of an aqueous solution containing 2.0 g of an organic solute. If the distribution coefficient for the solute between ether and water is 20, calculate the percent of the compound that can be recovered with a single extraction with 13.9 mL of
  95. chemistry

    name the following compounds and tell what type of compound they are (binary ionic. ternary ionic, or binary molecular) a)FeBr3 b)CBr4 c)Na2Cr2O7 still haven't gotten help yet and i posted a response to the question below
  96. chemistry

    200. g of a nonelectrolyte is dissolved in 1.00 kg of water. the boiling point of the solution is then measured to be 101.5 degrees C. What is the molar mass of the compound? The Kb for water is 0.51 degrees Celsius/m
  97. chemistry

    200. g of a nonelectrolyte is dissolved in 1.00 kg of water. the boiling point of the solution is then measured to be 101.5 degrees C. What is the molar mass of the compound? The Kb for water is 0.51 degrees Celsius/m
  98. Chemistry

    A compound is known to be a cesium halide, CsX. If 3.00 grams of the salt is dissolved in exactly 100.0 grams of water, the solution freezes at -0.735°C. What is the chemical formula for the salt?
  99. math

    Ali needs to borrow Rs 500,000 for three years. Which of the following option is more beneficial for him? (i) 3.2 % simple interest rate (ii) 1.6% compound interest rate when it is compounded semi annually
  100. Chemistry 11th Grade

    Nitrogen form five compound with oxygen in which 1.0 g of nitrogen combines with 0.572,1.14,1.73,2.28 and 2.85g of oxygen respectively .show dis figure agree with law of multiple proportion.