Chemistry

in a solution of dichloromethane (ch2cl2) in 2-hexanone (ch3coc4h9), the mole fraction of dichloromethane is 0.380. if the solution contains only these two components, what is the molality of dichloromethane in this solution?
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in the experiment we have followed the progress of the reaction by measuring the decrease in concentration of h2o2 with time. how else might this reaction be conveniently followed?
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with an atomic number of 11, which of these elements gets its symbol from the latin word natrium?
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what volume ratio of 0.110 m hcoona to 0.125 m hcooh would be needed to prepare a buffer with a ph of 4.00?
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assuming ideal behavior, how many liters hcl gas are required to make concentrated hydrochloric acid (11.6 mol/l) at 25oc and 1 atm pressure?
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15 l of a gas, initially at 10 oc, is heated to 50 oc at constant pressure. what is the final volume of the gas (in l)? enter your answer to at least two decimal places.
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which element has the highest second ionization energy?which element has the highest second ionization energy? ga k ca cs
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The major product of the synthesis, 3-methoxyheptane, is produced by an SN2 mechanism. Complete the reaction mechanism below by adding curved arrows showing electron flow and the final product, including the correct stereochemistry, to demonstrate the formation of the major product (3-methoxyheptane).
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what happens when thermal energy is applied to a substance?(1 point) responses its particles slow down. its particles slow down. its atoms gain kinetic energy.
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Boric acid (H3BO3) dissociates in water following the reaction: H3BO3 H+ + H2BO3-. You dissolve a certainamount of H3BO3 in pure water, creating an aqueous solution. You are able to measure the undissociated fraction (i.e., H3BO3), and you find it has a concentration [H3BO3] = 16 mmol m-3. You also measure pH, and realize that the solution has remained perfectly neutral (pH = 7). [You can ignore the second and third dissociations of H3BO3 for this problem.](a) Determine if H3BO3 is a strong or weak acid. To do so, calculate the dissociation constant Ka, and determine whether pKa>2 or not. [2 points]
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calculate the change in ph when 7.00 ml of 0.100 m hcl(aq) is added to 100.0 ml of a buffer solution that is 0.100 m in nh3(aq) and 0.100 m in nh4cl(aq). consult the table of ionization constants as needed.
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what is the symbol (including the atomic number, mass number, and element symbol) for the oxygen isotope with 9 neutrons?
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help please need by tomorrowA metal object with mass of 20.9 g is heated to 97.0 C and then transferred to an insulated container containing 86.0 g of water at 20.5 C. The water temperature rises and the temperature of the metal object falls until they both reach the same final temperature of 24.1 C. What is the specific heat of this metal object? Assume that all the heat lost by the metal object is absorbed by the water.
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explain why a diazonium group on a benzene ring cannot be used to direct an incoming substituent to the meta position.
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what is relationship between the velocity of gas molecules in the gas phase and the temperature of the gas?
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please help!!!!!!!!!
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why do hyp-containing collagen molecules have greater stability? to investigate this question a group of investigators
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No2 (g) +CO()NO)CO2(g) calculate the order of the reaction with respect to the following reactants according to the following experimental data: Experiment INO2lo (M) ICOlo (M) Initial Rate-AINO2VAt (M/s) 1 0.263 0. 826 1.44 x 10^-5 2 0.263 0. 413 1.44 x 10^-5 3 0.526 0.413 5.76 x 10^-5 Order of the reaction with respect to NO2: _____Order of the reaction with respect to CO: ______
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if there is a concern that an unattached structure contains hazardous chemicals or flammable/combustible liquids, firefighters should:
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At 19 degrees Celsius a gas exerts 1.92 of pressure at what temperature(in Celsius) will it exert a pressure of 0.45 atm
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Suppose that the identification labels fell off three of the Beral pipets in the set used in this experiment: You realize that the pipets with the missing labels hold NHACI, HCI, and NaCl solutions. Describe an experiment you could perform, using these three solutions and any two of the indicators used in this experiment; not including the Universal Indicator; that would allow you to correctly relabel the pipets. If the data from your experiment would be inconclusive, state the pH range for which you would need an indicator to make certain of the identifications.'
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if a mechanism requires numerous parts to work together in order to operate properly, then the parts are said to be .
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a 35.0 ml solution of naoh is neutralized with 26.5 ml of 0.250 m hcl. what is the concentration of the original naoh solution?
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The picture shows a model of the internal structure of Earth.Which evidence best supports the different characteristics of each layer in this model?evaluations of seismic datadirect observations of the layersexplanations of the rock cyclesamples of rocks from the layers
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