Chemistry

if 20.6 grams of an aqueous solution of sodium carbonate, na2co3, contains 3.11 grams of sodium carbonate, what is the percentage by mass of sodium carbonate in the solution?
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which separation technique would be the best method to separate a 1:1 mixture of aniline and ethylbenzene?
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francine added 3.0 ml of 4.0 m koh to 6.0 ml of 0.30 m hbr. determine whether the resulting mixture is acidic, basic, or neutral.
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PLEASE HELP THIS IS URGENT
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the reaction rate is measured as -2.6 m ch4/s. determine the rate of appearance of co2 and the rate of appearance of h2o. explain how you arrived at your answers.
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strain energy for alkanes interaction / compound kj/mol kcal/mol h : h eclipsing 4.0 1.0 h : ch3 eclipsing 5.8 1.4 ch3 : ch3 eclipsing 11.0 2.6 gauche butane 3.8 0.9 cyclopropane 115 27.5 cyclobutane 110 26.3 cyclopentane 26.0 6.2 cycloheptane 26.2 6.3 cyclooctane 40.5 9.7 (calculate your answer to the nearest 0.1 energy unit, and be sure to specify units, kj/mol or kcal/mol. the answer is case sensitive.)
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what is the product of the reaction sequence below 2 methyl 1 hexanol 2 methyl 2 hexanol 1 heptanol 2 heptanol
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under standard conditions (298 k and 1 atm), which statement is true? refer to the constants for thermodynamic properties under standard conditions. a. diamond converts to graphite spontaneously b. graphite converts to diamond spontaneously c. none of the above
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based on your melting points and demo tlc, comment on the success of the extraction experiment. are the tlc and melting points in agreement? which is the purest solid of the three? does the result make sense? explain your answer. (
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a quantity of electric charge deposits 0.732 g of ag(s) from an aqueous solution of silver nitrate. when that same quantity of charge is passed through a solution of a gold salt, 0.446 g of au(s) is formed. what is the oxidation state of the gold ion in the salt?
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why is aluminium brass used to make door handles instead of pure copper ?
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in the combustion analysis of 17.1 g of sugar (c12h 22o 11), what mass, in grams, of o 2 would be consumed?
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g a positive benedict's test is indicated by the formation of which of the following? a. cu2o b. cu c. cu2 d. metallic mirror
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fumes of iodine are produced when potassium iodide is oxidized by concentrated sulfuric acid.Write a correct equation of reaction.
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as the temperature increases, the rate of enzymatic reactions can ; however, at extremely high temperatures (95c) the rate will dramatically due to .
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what is the relationship between the unit cell edge length a and the atomic radius r for the body-centered cubic crystal structure?
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A container has a pressure of 5,64 atm and a volume of 26.0 L. The volume of the container was decreased until the pressure was 9:17 atm. What is the new volume?
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a substance is maintained at a pressure of 300 x 105 [n/m^2] (absolute). which answer best describes that pressure in customary us units?
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calculate the number of moles when 50g of copper (II) sulfate crystals, CuSO4.5H2O
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review the terms and their definition in the mini glossary. write a sentence that shows your understanding of one of the properties of metals.
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Ammonium carbamate, NH4OCONH2, decomposes to produce ammonia and carbon dioxide. At 23.00 C the value Kp for this reaction is 4.0110-3 .
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you are given a sample of kool-aid with an unknown concentration and you measure the absorbance in the spectrophotometer. the absorbance reading is 1.5. approximately what is the concentration of the sample?
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prior knowledge questions (do these before using the gizmo.) what important gas do we take in when we breathe?
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when millerite, an ore containing solid nis , is roasted in the presence of oxygen, sulfur dioxide gas and a solid oxide of nickel are produced. in the reaction, nickel does not change oxidation state.enter the balanced chemical equation for the metallurgical reaction. include physical states.
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