Chemistry concepts and calculations

1.) You visit Colorado for vacation and drive through a beautiful valley. How co

1.) You visit Colorado for vacation and drive through a beautiful valley. How could you determine if the valley was initially formed by a glacier or by a river? 2.) This rock you …

1.) a 0.964 gram sample of a mixture of sodium formate andsodium chloride is ana

1.) a 0.964 gram sample of a mixture of sodium formate andsodium chloride is analyzed by adding sulfuric acid. The equationfo the reaction for sodium formate with sulfuric acid is…

1.) a metal sample weighing 147.90g and at a temperature of 99.5 c was placed in

1.) a metal sample weighing 147.90g and at a temperature of 99.5 c was placed in 49.73g of water in a calorimeter at 23.0 c. at equilibrium the temperature of the water and metal …

1.) a) Is the process of KNO 3 dissolving in water spontaneous at all temperatur

1.) a) Is the process of KNO3 dissolving in water spontaneous at all temperatures studied? Is it spontaneous at higher or lower temperatures? Briefly explain. b) Is the reaction i…

1.) a.) Write a program C++ that takes a given number less than 256 in DECIMAL a

1.) a.) Write a program C++ that takes a given number less than 256 in DECIMAL and converts it to BINARY. b.)Write a program C++ that takes the output above in BINARY and converts…

1.) average number of moles of NaOH dispensed 3,) Based on your coarse titration

1.) average number of moles of NaOH dispensed 3,) Based on your coarse titration volume, do you expect the acetic acid solution to have a higher or lower concentration than the Na…

1.) describe, exactly, how you would prepare a 500ml solution of 2M sodium hydro

1.) describe, exactly, how you would prepare a 500ml solution of 2M sodium hydroxide. 2.)You dissolve 50 grams of concentrated hydrochloric acid which has a w/w content of 35% hyd…

1.) describe, exactly, how you would prepare a 500ml solution of 2M sodium hydro

1.) describe, exactly, how you would prepare a 500ml solution of 2M sodium hydroxide. 2.)You dissolve 50 grams of concentrated hydrochloric acid which has a w/w content of 35% hyd…

1.) dimethyl oxalate is a molecular compound of composition CxHyOz and is 40.68%

1.) dimethyl oxalate is a molecular compound of composition CxHyOz and is 40.68% C, 5.122%H and 54.19%O by weight. The formula weight is known to lie within the range 101-123 g/mo…

1.) for the reaction below: a. assign an oxidation state to each atom in the rea

1.) for the reaction below: a. assign an oxidation state to each atom in the reactants and each atom of the products. b. state which element is oxidized and which element is reduc…

1.) how many mole of oxygen atoms are present in 5.36g of CaCo3? 2.) how many mo

1.) how many mole of oxygen atoms are present in 5.36g of CaCo3? 2.) how many moles of Cl atoms are there in 1.7g of CCl4 3). What is the mass of 2.4x10^29 particles of CaCo3? 4.)…

1.) mass of air in flask in grams 2.) mass of empty flask in grams 3.) mass of g

1.) mass of air in flask in grams 2.) mass of empty flask in grams 3.) mass of gas in flask in grams 4.) molar mass of gas in grams per mole Part 2: Determination of the Molar Mas…

1.) mass of air in flask in grams 2.) mass of empty flask in grams 3.) mass of g

1.) mass of air in flask in grams 2.) mass of empty flask in grams 3.) mass of gas in flask in grams 4.) molar mass of gas in grams per mole Part 2: Determination of the Molar Mas…

1.) the magnesium ion has the same number of valence electronsas which of the fo

1.) the magnesium ion has the same number of valence electronsas which of the following. a. Na b. P3+ c. O2- d. Br 2.)Which compund has one unshared pair of valenceelectrons? a. C…

1.) which statement does not describe a step in the response to photon absorptio

1.) which statement does not describe a step in the response to photon absorption by rhodopsin? a. Rhodopsin catalyzes GDP/GTP exchange on transducin b. light absorption converts …

1.) why do some amino acids have a similar pl value and why do some have a diffe

1.) why do some amino acids have a similar pl value and why do some have a different one . 2.) why do some amino acids have 2 pka's and some have 3 pka's. 3.) what is the third pk…

1.) write an equation to show how nitric acid is a strong arrhenius acid. 2.) wr

1.) write an equation to show how nitric acid is a strong arrhenius acid. 2.) write an equation to show how potassium hydroxide is a strong arrhenius base. 3.)write an equation to…

1.). In scheme 3 cyclopropane 3 is acting as: a.) nucleophile b.) solvent c.) ac

1.). In scheme 3 cyclopropane 3 is acting as: a.) nucleophile b.) solvent c.) acid d.) catalyst In scheme 4 cyclopropane 11w is acting as: a. ) nucleophile b.) solvent c.)catalyst…

1.)A 4.12 gram sample of argon gas has a volume of 922 milliliters at a pressure

1.)A 4.12 gram sample of argon gas has a volume of 922 milliliters at a pressure of 3.96 atm. The temperature of the Ar gas sample is ___________°C. 2.) A mixture of carbon dioxid…

1.)A 50 C point charge is at the origin. A: Find the electric field at the point

1.)A 50 C point charge is at the origin. A: Find the electric field at the point x1 = 70 cm ,y1 = 0. Express your answers using two significant figures. Enter the x and y componen…

1.)A gas mixture contains 74% nitrogen and 26% oxygen.If the total pressure is 1

1.)A gas mixture contains 74% nitrogen and 26% oxygen.If the total pressure is 1.02 atm what are the partial pressures of each component? Express your answers using two significan…

1.)A reaction in which A, B, and C react to form products is zero order in A, on

1.)A reaction in which A, B, and C react to form products is zero order in A, one-half order in B, and second order in C. By what factor does the reaction rate change if the conce…

1.)A sample of argon gas at a pressure of 0.633 atm and a temperature of 261 ° C

1.)A sample of argon gas at a pressure of 0.633 atm and a temperature of 261 °C, occupies a volume of 694 mL. If the gas is heated at constant pressure until its volume is 796 mL,…

1.)A student prepares a potassium dichromate solution by dissolving .5263 gram o

1.)A student prepares a potassium dichromate solution by dissolving .5263 gram of dry solid potassium dichromate in enough water to make 1000.mL of solution. What is the concentra…

1.)A.)What is the pH at the equivalence point in the titration of a 21.1 mL samp

1.)A.)What is the pH at the equivalence point in the titration of a 21.1 mL sample of a 0.363 M aqueous hypochlorous acid solution with a 0.397 M aqueous sodium hydroxide solution…

1.)All of the following statements are false EXCEPT the wavelength of light is d

1.)All of the following statements are false EXCEPT the wavelength of light is directly proportional to the speed of light (in a vacuum). 2.)The Schrödinger wave equation proves t…

1.)Assuming equal concentrations, rank these solutions by pH. Ca(OH)2(aq) ,NH3(a

1.)Assuming equal concentrations, rank these solutions by pH. Ca(OH)2(aq) ,NH3(aq) , HI(aq), NaOH(aq) , HF(aq) 2.) Write the chemical equation for the reaction of carbonic acid (H…

1.)Complete the Henderson -Hasselbach equation: pH = ______ 2.)Fill in the blank

1.)Complete the Henderson -Hasselbach equation: pH = ______ 2.)Fill in the blank: For polyprotic acids, by convention K1 refers to the acid species with the ______ protons. 3.)Fil…

1.)Consider the following initial rate data that were collected for the general

1.)Consider the following initial rate data that were collected for the general reaction below to answer the next three questions: Experiment [AB2] (M) [C] (M) Initial Rate (M/s) …

1.)Consider the following initial rate data that were collected for the general

1.)Consider the following initial rate data that were collected for the general reaction below to answer the next three questions: Experiment [AB2] (M) [C] (M) Initial Rate (M/s) …

1.)Describe the effect of increasing the concentration of the reactants on the r

1.)Describe the effect of increasing the concentration of the reactants on the rate of a reaction. 2.)The exponents in a rate law have no relationship to the coefficients in the o…

1.)Explain why it is necessary to consider the vapor pressure of water at the te

1.)Explain why it is necessary to consider the vapor pressure of water at the temperature conditions of the experiment in the calculations of the pressure of hydrogen. 2.)The elec…

1.)Glucose has a solubility of 125 g /100 mL. What is the approximate concentrat

1.)Glucose has a solubility of 125 g /100 mL. What is the approximate concentration of glucose in a saturated solution? How much glucose can be dissolved in 745 mL of water? Gluco…

1.)Identify the group of elements that corresponds to the following generalized

1.)Identify the group of elements that corresponds to the following generalized electron configuration: [noble gas]ns2(n?1)d2 2.)Indicate the number of unpaired electrons for foll…

1.)In one experiment, the reaction of 1.00 g mercury and an excess of sulfur yie

1.)In one experiment, the reaction of 1.00 g mercury and an excess of sulfur yielded 1.16 g of a sulfide of mercury as the sole product. In a second experiment, the same sulfide w…

1.)In one experiment, the reaction of 1.00 g mercury and an excess of sulfur yie

1.)In one experiment, the reaction of 1.00 g mercury and an excess of sulfur yielded 1.16 g of a sulfide of mercury as the sole product. In a second experiment, the same sulfide w…

1.)Maleic acid contains 41.4% carbon, 3.47% hydrogen, and 55.1% oxygen by mass.

1.)Maleic acid contains 41.4% carbon, 3.47% hydrogen, and 55.1% oxygen by mass. A 0.030-mol sample of this compound weighs 2.61 g. What is the molecular formula of maleic acid? 2.…

1.)Please explain an overview of the reaction sequence. 2.) discuss each type of

1.)Please explain an overview of the reaction sequence. 2.) discuss each type of reaction (acetylation, oxidation, hydrolysis) Synthesis of PABA 16 PABA, p-aminobenzoic acid, is u…

1.)The enthalpy of combustion of benzoic acid (C_66H_55CO_22H) is –3243 kJ/mol.

1.)The enthalpy of combustion of benzoic acid (C_66H_55CO_22H) is –3243 kJ/mol. The burning of 1.707 g of benzoic acid in a calorimeter causes the temperature to increase by 2.843…

1.)The internal energy of a substance is defined as the potential energy of all

1.)The internal energy of a substance is defined as the potential energy of all particles which make up the substance. the chemical energy of all particles which make up the subst…

1.)To prevent tank rupture during deep-space travel, an engineering team is stud

1.)To prevent tank rupture during deep-space travel, an engineering team is studying the effect of temperature on gases confined to small volumes. What is the pressure of 4.00 mol…

1.)Which of the following is the most soluble in H2O? CH 3 CH 2 CH 3 CH 3 CH 2 C

1.)Which of the following is the most soluble in H2O? CH3CH2CH3 CH3CH2Cl CH3CH2OH CH3OCH3 CH3CHO 2.) Which of the following is diisopropyl ether? CH3CH2CH2OCH(CH3)2 CH3CH2CH2—O—CH…

1.)Which of the following processes will result in the lowest final temperature

1.)Which of the following processes will result in the lowest final temperature of the metal–water mixture at equilibrium? the addition of 100 g of cobalt (s = 0.418 J/(g • °C)) a…

1.)Which of the following statements is incorrect concerning the thermochemical

1.)Which of the following statements is incorrect concerning the thermochemical equation below? 2SO3(g) 2SO2(g) + O2(g); H° = 198 kJ For every mole of SO3(g) consumed, 99 kJ of he…

1.)Write the net ionic equation for the reaction of aqueous solutions of silver

1.)Write the net ionic equation for the reaction of aqueous solutions of silver nitrate andlithium bromide. (Include states-of-matter under the given conditions in your answer. Us…

1.)a.)S-waves do not pass through: the asthenosphere the outer core the mantle t

1.)a.)S-waves do not pass through: the asthenosphere the outer core the mantle the lithosphere b.) Approximately how thick is the lower mantle: 220 km 2,200 km 220,000 km 22 km 22…

1.)a.)The density range of the earth is approximately: 2.7 - 13 g/cm3 20 - 32 g/

1.)a.)The density range of the earth is approximately: 2.7 - 13 g/cm3 20 - 32 g/cm3 30 - 125 g/cm3 3.3 - 8 g/cm3 70 - 2900 g/cm3 b.) Where do pillow basalts form? in the core on t…

1.)a.)Which features are parallel to the mid-ocean ridge: none of the above both

1.)a.)Which features are parallel to the mid-ocean ridge: none of the above both of the above paleomagnetic stripes transform fracture zones b.) The crust is thicker than the lith…

1.)a.)Which formed as a result of continental convergence: the San Andreas fault

1.)a.)Which formed as a result of continental convergence: the San Andreas fault Mt. St. Helens all of the above the mid-ocean ridge The Himalayan Mountain range b.) The Hawaiian …

1.)a.)Which of the following is a passive continental margin: none of the above

1.)a.)Which of the following is a passive continental margin: none of the above the East Coast of North America both of the above the West Coast of North America b.) Which layer o…