Chemistry

In a game of "Clue," Ms. White is killed in the conservatory. You have a device in each room to help you find the murderer a spectrometer that emits the entire visible spectrum to indicate who is in that room. For example, if someone wearing yellow is in a room, light at 580 nm is reflected. The suspects are Col. Mustard, Prof. Plum, Mr. Green, Ms. Peacock (blue), and Ms. Scarlet. At the time of the murder, the spectrometer in the dining room recorded a reflection at 520 nm, those in the lounge and study recorded reflections of lower frequencies, and the one in the library recorded a reflection of the shortest possible wavelength. Who killed Ms. White? Explain.
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express y in terms of x
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How many inner, outer, and valence electrons are present in an atom of each of the following elements?(a) O (b) Sn (c) Ca (d) Fe (e) Se
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What mass of strontium nitrate (Sr(NO3)2) would be required to prepare 2.000 L of a 0.0150 M aqueous solution of this salt?
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Cobalt-60 is a radioactive isotope used to treat cancers. A gamma ray emitted by this isotope has an energy of 1.33 MeV (million electron volts; 1 eV = 1.602 x 10 J). What is the frequency (in Hz) and the wavelength (in m) of this gamma ray?
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The angle at which light strikes a surface is the same as the angle at which it is reflected. true or false
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You need to purchase an expensive chemical for a series of enzyme assays. Sigma Chemical Company sells the chemical in 1g ($30), 5g ($120), 10g ($200), and 25g ($400) vials. You will perform 40 assays. Each assay requires 3 ml of a 250mM solution of the chemical (M.W. = 156 g/mole). Which vial(s) is the best choice for your limited budget?
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What volume would be occupied by 12.4 moles of helium gas at STP
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The atomic mass of sulfur is 32.1 amu, and the atomic mass of oxygen is 16.0 amu. To the nearest tenth of a percent, what is the percent by mass of sulfur in sulfur trioxide (SO3)?
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A West Virginia coal is burned at a rate of 8.02 kg/s. The coal has a sulfur content of 4.40 % and the bottom ash contains 2.80 % of the input sulfur. What is the annual rate (in kg/yr) of stack emissions of SO2
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Calcium nitrate and ammonium fluoride react to form calcium fluoride, dinitrogen monoxide, and water vapor. How many grams of dinitrogen monoxide are present after 31.3 g of calcium nitrate and 38.7 g of ammonium fluoride react completely? Hint: Write a balanced chemical reaction first, then find which one is the limiting reactant.
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When a variable is determined by a factor outside of the function or model being evaluated, it is said to be A. statistically insignificant. B. exogenous. C. endogenous. D. unexplained.
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The physicals properties of a substance can be used to identify the substance, because_____. Select all that apply.1. at any given location, the physical properties of a substance do not change2. when the substances are chemically reacted the physical properties remain the same3. each substance has a unique set of physical properties4. no two substances have any of the same properties
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why does hydrogen only burn at the mouth of the bottle?
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As an athlete exercises, sweat is produced and evaporated to help maintain a proper body temperature. On average, an athlete loses approximately 443 g of sweat during an hour of exercise. How much energy is needed to evaporate the sweat that is produced? The heat of vaporization for water is 2257 J/g.
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Elements are represented by _____ or _____ letter symbols. Provide an example of an element and its symbol:
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For each of the following, give the sublevel designation, the allowable ml values, and the number of orbitals:(a) n = 4, l = 2(b) n = 5, l = 1(c) n = 6, l = 3
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When 2bromo3,3dimethylbutane is treated with K OC(CH), a single product T having molecular formula CH. When 3,3dimethyl2butanol is treated with HSO, the major product U has the same molecular formula. Given the following H NMR data, what are the structures of T and U?
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The following questions deal with safety issues in the Solutions and Spectroscopy experiment. (Select all that apply.) (a) Which hazards are associated with copper(II) sulfate? carcinogenic irritant toxic corrosive flammable (b) What actions should you take if you spill copper(II) sulfate solution on yourself? Dry the area with paper towels, but avoid getting it wet. Neutralize it with a solution of sodium bicarbonate. Neutralize it with a solution of sodium bisulfite. Flush the affected area with water. (c) What clothing is appropriate for the laboratory? shorts tank tops without sleeves shirt and pants that overlap 6" sandals pants that extend to the ankles shoes that cover heels and toes a shirt that covers the shoulders (has sleeves)
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Write the ground-state electron configurations of the following transition metal ions. (a) Sc3 (b) Cr3 (c) Cu (d) Au
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A reaction at 12.0 C evolves 358, mmol of sulfur hexafluoride gas. Calculate the volume of sulfur hexafluoride gas that is collected. You can assume the pressure in the room is exactly 1 atm. Round your answer to 3 significant digits. volume: LL
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Which statement would support a merit of the Bronsted-Lowry base theory has over the Arrhenius base theory?A) Hydronium ions are Bronsted-Lowry bases released in solution.B) Bronsted-Lowry bases include both proton and hydroxide acceptors.C) The Bronsted-Lowry bases can act as electron and proton acceptors.D) Hydroxide ions are the only Bronsted-Lowry bases produced in solution.
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What is the pressure generated in a 10 liter container at 300K when68 gram of H2O2 decomposes? please I only have 30 minutes left
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Which reaction model represents a nuclear fission reaction?A B + CA B + C + nA + C B + nn + A B + C + n
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