Master Chemistry with Fun Quizzes & Brain Teasers!

nickel has a face-centered cubic (fcc) structure and has a density of 8.90 g/cm3. what is its atomic radius?
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14c has a half life of 5730 years. how many years does it take (roughly) for 14c to decay to 1/32 of the original concentration?
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calculate the ph of a buffer that contains 0.38 m hydrofluoric acid and 0.86 m fluoride. ka for hydrofluoric acid is 6.6 x 10-4.
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what is the difference in energy between the two levels responsible for the violet emmission line of the calcium atom at 422.7nm
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the density of an unknown gas is 2.00 grams per liter at 3.00 atmosphere pressure and 127oc. what is the molar mass of this gas?
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explain why a higher difference in electronegativity would create an ionic bond and a lower difference in electronegativity would create a covalent bond
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20.00 g sample of methyl salicylate contains 12.63 g of carbon, 1.06 g of hydrogen, and 6.31 g of oxygen, the empirical formula of methyl salicylate is
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lactic acid, which consists of c, h, and o, has long been thought to be responsible for muscle soreness following strenuous exercise. determine the empirical formula of lactic acid given that combustion of a 10.0-g sample produces 14.7 g co2 and 6.00 g h2o. what is the molecular formula if the molecular weight of lactic acid is 90.08 g/mol
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which of the following was true for the system between time t1 and time t2? (a) the concentration of n2 decreased. (b) the temperature of the system decreased. (c) the number of effective collisions between h2 and n2 was zero. (d) the rates of the forward and reverse reactions were equal. (e) the rate of formation of nh3 molecules was equal to the rate of disappearance of h2 molecules.
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aluminum metal reacts with chlorine gas to form aluminum chloride the reaction starts with 3 g of chlorine gas and unlimited supply of aluminum, how many grams of aluminum chloride can be formed?
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ammonium ion (nh4 ) is an acid that can dissociate to form ammonia (nh3) and h in aqueous solution. the pka for this reaction is 9.25. when total ammonium ion is 50% dissociated, what is the ph?
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a chemist adds of a mercury(i) chloride solution to a reaction flask. calculate the micromoles of mercury(i) chloride the chemist has added to the flask. round your answer to significant digits.
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write the ground-state electron configuration for a neutral atom of each element: titanium and vanadium
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draw the structure of the product of each step in the threestep synthesis. show all formal charges.
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Water boils at 100 degrees Celsius. What is the boiling point for water on the Kelvin scale? K = C + 273 and C = K - 273
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a tank contains 8l of water in which is dissolved 32 g (grams) of chemical. a solution containing 2 g/l of the chemical flows into the tank at a rate of 4 l/min, and the well-stirred mixture flows out at a rate of 2 l/min. determine the amount of chemical in the tank after 20 minutes. show all work and setup.
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g a student chose 1m acetic acid as the buffer solution to inhibit the ph change of an aqueous solution. if a strong acid is added to the solution, would this buffer solution inhibit the change of ph to the aqueous solution? explain.
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what is the partial pressure of neon that's 18% by volume in a gas mixture with a total pressure of 310 kpa?
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a chemist decomposes 1.006 g of nahco3 and obtains 0.0334 g of na2co3. what are the units on the theoretical yield, the actual yield and percent yield?
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the acid dissociation constant of trimethylacetic acid is . calculate the ph of a solution of trimethylacetic acid. round your answer to decimal place.
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the minimum temperature at which a flame will ignite and continue to burn fuel oil vapor as it rises from a pool of liquid fuel oil is called the .
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if 13.5 g of co2 gas has a volume of 0.48 l at 335 k , what is its pressure in millimeters of mercury?
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determine the molar mass (in g/mol) of a gas that travels with an effusion time that is 1.55 times longer than that of co2(g).
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methylhydrazine (ch6n2) is commonly used as a liquid rocket fuel. when 4.00 g of methylhydrazine is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25.00 oc to 39.05 oc. in a separate experiment the heat capacity of the calorimeter is measured to be 7.794 kj/oc. what is the heat of reaction for the combustion of a mole of ch6n2 in this calorimeter?
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