Master Chemistry with Fun Quizzes & Brain Teasers!

you add 0.50 mol so3 to a 1.00 liter flask. after allowing the reaction to reach equilibrium. 0.34 moles of so3 remain in the flask. what is the value for the equilibrium constant
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how many protons and neutrons does this nuclide contain? identify the element. protons neutrons element symbol: part 2 (3 points)see hint how many protons and neutrons does this nuclide contain? identify the element. protons neutrons element symbol: part 3 (3 points)see hint how many protons and neutrons does this nuclide contain? identify the element. protons neutrons element symbol: part 4 (1 point)see hint which two nuclides are isotopes of one another? choose one: a. part 1 and part 3 b. part 2 and part 3 c. part 1 and part 2
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hydrogen cyanide, hcn, is a poisonous gas. the lethal dose is approximately 300 hcn per kilogram of air when inhaled. (a) calculate the amount of hcn that gives the lethal dose in a small laboratory room measuring . the density of air at is 0.00118 (b) if the hcn is formed by reaction of with an acid such as what mass of nacn gives the lethal dose in the room?
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identify the initial and final states if an electron in hydrogen emits a photon with a wavelength of 656 nm .
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a helium-filled toy balloon has a gauge pressure of 0.350 atm and a volume of 11.0 liters. how much greater is the internal energy (in j) of the helium in the balloon than it would be at zero gauge pressure?
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a mixture of nabr and na2so4 contains 29.96 percent na by mass. calculate the percent by mass of each compound in the mixture
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a government agency recommends that the amount of arsenic in drinking water should not be above 0.01 ppm. at this concentration, how many grams of arsenic would you expect to find dissolved in 1000 ml of pure water?
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from your observations in step 7, what can you conclude about the relative equilibrium concentrations of cro42- (aq) ion in each of the solutions 0.1 m k2cr2o7 and 0.1 m k2cro4 before the ba(no3)2 solution is added?
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explain why most metals and alloys are malleable and ductile while ionic crystals are not. because of the ability of the atoms to roll over each other into new positions without breaking the metallic bond.
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Draw the structure of the tripeptide Gly-Gly-His. It has a role as a metabolite. Then determine the total charge of the tripeptide.
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Wave Rock is a granite outcropping in western Australia.The curved cliff has been weathered by water, whichchanged some of the minerals that make up the graniteand caused the streaks of color.Which type of weathering caused the streaks of color?
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Read the given expression. X = number of protons number of core electrons Which of the following explains the identity of X and its trends across a period? (5 points) a X is the effective nuclear charge, and it remains constant across a period. b X is the screening constant, and it remains constant across a period. c X is the effective nuclear charge, and it increases across a period. d X is the screening constant, and it increases across a period.
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liquid octane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . what is the theoretical yield of carbon dioxide formed from the reaction of of octane and of oxygen gas? be sure your answer has the correct number of significant digits in it.
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select true or false: more energy is required to break a bond with an order of 3/2 than is required to break a bond of order 2.
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a compound is found to contain 7.523 % phosphorus and 92.48 % iodine by mass. what is the empirical formula for this compound?
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in a covalent bond between fluorine and oxygen, which atom will be partially negative (i.e. has the greater electronegativity)?
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what is the percent yield of sulfur if 7.54 grams of sulfar are obtained from the reaction of 6.16 gram sof so2 with excess h2s
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what is the molar mass of pb(so4)2, given the following molar masses for each element: pb, 207.2 g; s, 32.06 g; and o, 16.00 g?
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if the reaction yields 21.1l of nitrogen gas what mass of nan3 in grams would be required to produce this volume at stp?
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g if a certain radioactive substance has a half-life of 7 days, how long, in days, does it take for the sample to decay to 1 3 of its original amount
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hromium can be electroplated from an aqueous solution containing sulfuric acid and chromicacid, h2cro4. what current is required to deposit 1.25 g chromium metal (atomic weight
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color of the solution in the control changed? 4) infer. when you began the experiment, was there co2 in the water? in the test tubes that contained elodea, where did the co2 go?
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each week capechem, a manufacturer of fine chemicals, uses up of compound and of compound in a reaction with only one product, compound . what is the maximum theoretical mass of compound that capechem could ship each week? round your answer to the nearest kilogram. suppose on average the percent yield of in capechem's reactors is . calculate the average amount of compound that capechem actually ships each week. round your answer to the nearest kilogram.
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a tank at is filled with of sulfur hexafluoride gas and of dinitrogen difluoride gas. you can assume both gases behave as ideal gases under these conditions. calculate the mole fraction and partial pressure of each gas, and the total pressure in the tank. be sure your answers have the correct number of significant digits. sulfur hexafluoride mole fraction: partial pressure: dinitrogen difluoride mole fraction: partial pressure: total pressure in tank:
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