Chemistry concepts and calculations

1.)a.)Which of the following statements about reefs is FALSE: reefs are composed

1.)a.)Which of the following statements about reefs is FALSE: reefs are composed of organisms built of calcium carbonate (CaCO3) reefs form only in deep water as islands erode awa…

1.)a.)Which of the following was not used by Wegener as evidence of continental

1.)a.)Which of the following was not used by Wegener as evidence of continental drift? magnetic anomalies on the seafloor all of the above were used by Wegener as evidence of cont…

1.)calculate the equilibrium concentrations of all species with an initial conce

1.)calculate the equilibrium concentrations of all species with an initial concentration of .43M chlorous acid Ka=0.000076. calculate the ph of the solution 2.)summarize the prope…

1.- A balloon is inflated to a volume of 3.2 liters at room temperature (23oC) a

1.- A balloon is inflated to a volume of 3.2 liters at room temperature (23oC) and placed into a freezer where the temperature is 3oC. What is the volume of the balloon when it re…

1.- Calculate the density of Copper FCC, Copper Atomic Radio is 0.1280 nm and at

1.-Calculate the density of Copper FCC, Copper Atomic Radio is 0.1280 nm and atomic mass 63.55 g / mol. 2.- 3.9 moles of solid MgO (atomic mass Mg 24.31 g / mol, atomic mass O 16.…

1.- Calculate the value of the equilibrium constant for the following reactions:

1.- Calculate the value of the equilibrium constant for the following reactions: a) NH3 +H3O+<-->NH4+ + H2O b) NO2^- + H3O+ <-->HNO2 + H2O c) NH4^+ + OH- <--> NH…

1.- Compounds A (Cs = 0.35 J/g. o C), B (Cs = 0.90 J/g. o C) and C (Cs = 0.72 J/

1.- Compounds A (Cs = 0.35 J/g.oC), B (Cs = 0.90 J/g.oC) and C (Cs = 0.72 J/g.oC) have the same mass and same temperature. If the temperature of all three compounds (A, B and C) i…

1.- Consider the following page reference string: 1, 2, 3, 4, 2, 1, 5, 6, 2, 1,

1.- Consider the following page reference string:                         1, 2, 3, 4, 2, 1, 5, 6, 2, 1, 2, 3, 7, 6, 3, 2, 1, 2, 3, 6 How many page faults would occur for the FIFO …

1.- Determine the number or quantity of atoms, the number of moles and the mass

1.- Determine the number or quantity of atoms, the number of moles and the mass of a rectangular prism of Silver (Ag) of 20.0 mm in width and 35 mm in length and 2.5 mm in thickne…

1.- What is the pH of a solution prepared by mixing 100.00 mL of 0.020 M Ca(OH)2

1.- What is the pH of a solution prepared by mixing 100.00 mL of 0.020 M Ca(OH)2 with 50.00 mL of 0.200 M NaOH? Assume that the volumes are additive. A) 12.97 B) 13.45 C) 12.90 D)…

1.-5. Match each pair of compounds on the left a its corresponding melting point

1.-5. Match each pair of compounds on the left a its corresponding melting points (m.p.) or boiling points (b.p.) in oCto a major reason, given on the right, why the physical prop…

1.-5. Match each pair of compounds on the left and its corresponding melting poi

1.-5. Match each pair of compounds on the left and its corresponding melting points (m.p.) or boiling points (b.p.) in °C to a major reason, given on the right, why the physical p…

1.-5. Match each pair of compounds on the left and their corresponding melting p

1.-5. Match each pair of compounds on the left and their corresponding melting points (m.p.) or boiling points (b.p.)in to the major reason why they increase. Answers may be repea…

1.-A 0.972-g sample of aCaCl 2 . 2H 2 O/K 2 C 2 O 4 . H 2 Osolid salt mixture is

1.-A 0.972-g sample of aCaCl2.2H2O/K2C2O4.H2Osolid salt mixture is dissolved in ~150 mL of deonized water. Ifthe solid salt mixture contained 0.375 g ofCaCl2.2H2O, what is the % m…

1.-The vapor pressure of water at 25 degrees celsius is 23.8 mmHg. Write Kp for

1.-The vapor pressure of water at 25 degrees celsius is 23.8 mmHg. Write Kp for the vaporization of water in the unit of atm. What is Kc for the vaporization process? 2.-When 1.00…

1....A 2.007 g sample of a hydrocarbon C x H y is combusted to give 1.389 g of H

1....A 2.007 g sample of a hydrocarbon CxHy is combusted to give 1.389 g of H2O and 6.785 g of CO2. What is the empirical formula of the compound? (exact match required, do not us…

1....A solution is made by adding 580 grams of Potassium phosphate to 5.5 kilogr

1....A solution is made by adding 580 grams of Potassium phosphate to 5.5 kilograms of water giving a final volme of 5.6 L.... wht is the a) mass percent b) molarity c) molality d…

1./ An element X has a tribromide with the empirical formula XBr3 and a trichlor

1./ An element X has a tribromide with the empirical formula XBr3 and a trichloride with the empirical formula XCI3. The tribromide is converted to the trichloride according to th…

1.0 6. What is the Extinction Coefficient for tryptophan, based on your linear r

1.0 6. What is the Extinction Coefficient for tryptophan, based on your linear regression analysis? 7. Using the linear regression equation in question 4, find the concentration o…

1.0 M of NaOH, 1.0 M of HCl. 28 J is the heat calorimeter B. Heat of Neutralizat

1.0 M of NaOH, 1.0 M of HCl. 28 J is the heat calorimeter B. Heat of Neutralization of HCI with NaOH Show your calculations Molecular equation: HCl+ NaOH Ionic equation: Net ionic…

1.0 g of vanillin was dissolved in 20 mL of ethanol. To this solution, 1.17 g of

1.0 g of vanillin was dissolved in 20 mL of ethanol. To this solution, 1.17 g of sodium iodide was added, then cooled to 0 °C with an ice/water bath. 11.0 mL of aqueous sodium hyp…

1.0 g of vanillin was dissolved in 20 mL of ethanol. To this solution, 1.17 g of

1.0 g of vanillin was dissolved in 20 mL of ethanol. To this solution, 1.17 g of sodium iodide was added, then cooled to 0 °C with an ice/water bath. 11.0 mL of aqueous sodium hyp…

1.0 mol of CO and 1.0 mol of H2 react to produce CH3OH. If the reaction goes to

1.0 mol of CO and 1.0 mol of H2 react to produce CH3OH. If the reaction goes to completion, which of the following are true? . All of the CO is consumed. II.1.0 mol of CH3OH is pr…

1.00 L of pure methanol, CH3OH, is reacted with 1.00 kg of oxygen according to t

1.00 L of pure methanol, CH3OH, is reacted with 1.00 kg of oxygen according to the following reaction: 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(l) Determine the amount of carbon diox…

1.00 mol of PCl5 was sealed into an evacuated 1.00 liter flask andallowed to rea

1.00 mol of PCl5 was sealed into an evacuated 1.00 liter flask andallowed to reach equilibrium at some temperature, according to thereaction: PCl5 (g) <-> PCl3 (g) + Cl2 (g)…

1.00 mol of a van der Waals gas is compressed from 20.0 dm3 to 10 dm3 at 300K. I

1.00 mol of a van der Waals gas is compressed from 20.0 dm3 to 10 dm3 at 300K. In the process, 20.2 kJ of work is done on the gas. Given that ?= [(2a/RT)-b]/Cp,m, with Cp,m = 38.4…

1.00 points 2 attempts let Check my work Enter your answer in the provided box.

1.00 points 2 attempts let Check my work Enter your answer in the provided box. The solubility of N, in blood at 370C and at a partial pressure of 0.50 atm is 5.,6 x 10 moVL. A de…

1.00 points 2 attempts let Check my work Enter your answer in the provided box.

1.00 points 2 attempts let Check my work Enter your answer in the provided box. The solubility of N, in blood at 370C and at a partial pressure of 0.50 atm is 5.,6 x 10 moVL. A de…

1.000 10 0.951 20 0.904 30 0.860 40 0.818 50 0.778 60 0.740 70 0.704 80 0.670 90

1.000 10 0.951 20 0.904 30 0.860 40 0.818 50 0.778 60 0.740 70 0.704 80 0.670 90 0.637 100 0.606 Consider the following reaction: NO2(g)-->NO(g)+1/2O2(g)The following data were…

1.000 atm of Oxygen gas, placed in a container having apinhole opening in its si

1.000 atm of Oxygen gas, placed in a container having apinhole opening in its side. leaks from the container 2.14 timesfaster thatn 1.000 atm of an unknown gas placed in this same…

1.000 g of a weak base is titrated with 1.000 M aqueous HCl to give the data sho

1.000 g of a weak base is titrated with 1.000 M aqueous HCl to give the data shown. What is the identity of the base? (A) Ammonia, NH3 (pKa of NH4 + = 9.3) (B) Aniline, C6H5NH2 (p…

1.000 g of an organic molecule that contains only carbon and hydrogen bums compl

1.000 g of an organic molecule that contains only carbon and hydrogen bums completely in the presence of excess oxygen. It yields 0.0333 mol of CO_2 and 0.599 g of H_2O. Find the …

1.00ml of 3.90*10^-4M of oleochemicals acid is diluted with 9.00mL of petroleum

1.00ml of 3.90*10^-4M of oleochemicals acid is diluted with 9.00mL of petroleum ether, forming solution A. Then 2.00mL of solution A is diluted with 8.00mL of petroleum ether, for…

1.018 g of Freon-113 gas is trapped in a 145 mL container at 760 mmHg and 50.0 d

1.018 g of Freon-113 gas is trapped in a 145 mL container at 760 mmHg and 50.0 degree C. What is the molar mass of Freon-113? 21.7 g/mol 28 8 g/mol 46.1 g/mol 186 g/mol 245 g/mol …

1.02 g of hydrogen gas occupies 22.428 L. Although the volume of the gas Contain

1.02 g of hydrogen gas occupies 22.428 L. Although the volume of the gas Contain ____ significant digits the density of the gas (2.02 g/22.428 L = 0.0900659 g/L) should be reporte…

1.02 g of salicylideneaniline 0.61 g total of NaBH4 0.59 g total end product Als

1.02 g of salicylideneaniline 0.61 g total of NaBH4 0.59 g total end product Also, what is the melting point of the product? And the source product) for he setuliu reaction scheme…

1.032 g of drink mix containing FD&C; Red #40 (496.42 g/mol) was dissolved in wa

1.032 g of drink mix containing FD&C; Red #40 (496.42 g/mol) was dissolved in water to form 100.0 ml solution. 2.00 ml of the stock solution was diluted to 100.0 ml with disti…

1.06 g H2 is allowed to react with 10.4 g N2, producing 2.36 g NH3. Part A What

1.06 g H2 is allowed to react with 10.4 g N2, producing 2.36 g NH3. Part A What is the theoretical yield in grams for this reaction under the given conditions? Express your answer…

1.1 Explain the difference between using a computer program and programming a co

1.1 Explain the difference between using a computer program and programming a computer. 1.2 How do you discover syntax errors? How do you discover logic errors? 1.3 What is the di…

1.1 Prove the following formula by induction: sigma i=1 to N i^3 = (sigma i=1 to

1.1 Prove the following formula by induction: sigma i=1 to N i^3 = (sigma i=1 to Ni)^2. You must show base case, inductive hypothesis and proof in your solution. 1.2 Write a recur…

1.1.How many moles of calcium (Ca) atoms are in 74.0 g of Ca? 1 moles 2.What is

1.1.How many moles of calcium (Ca) atoms are in 74.0 g of Ca? 1 moles 2.What is the mass in grams of a single atom of each of thefollowing elements? (a) Zn 1 g (b) Os 2 g 3.Calcul…

1.10 g H 2 isallowed to react with 10.5 g N 2 , producing2.31 g NH 3 . 1-What is

1.10 g H2 isallowed to react with 10.5 g N2, producing2.31 g NH3. 1-What is the theoretical yield for thisreaction under the given conditions? 2-What is the percent yield for this…

1.10.0 g of sodium bicarbonate, NaHCO3(s) (MW 84.01 g/mol) is reacted with an ex

1.10.0 g of sodium bicarbonate, NaHCO3(s) (MW 84.01 g/mol) is reacted with an excess of hydrochloric acid, at a constant pressure of 1 atm, according to the following reaction: Na…

1.145 Sou 5, Asample of phosphorus weighing 0.500 g was ignited to the oxide in

1.145 Sou 5, Asample of phosphorus weighing 0.500 g was ignited to the oxide in a stream of oxygen A1 41 gas. What is the empirical formula of phosphorus oxide if the product has …

1.15 . The amount of dissolved ions in a solution is expressed using the unit eq

1.15 . The amount of dissolved ions in a solution is expressed using the unit equivalent (Eq) of the ion. A unit equivalent of an ion relates the charge present on the ion to the …

1.16 At 298.15 K, all of the following substances have a standard free energy of

1.16 At 298.15 K, all of the following substances have a standard free energy of formation of zero EXCEPT ____. a) Br2(l) b) I2(s) c) S8(s) d) Cl2(g) e) Hg(g) 1.18 The standard fr…

1.18 A. we know that mole fraction of oxygen in air = 0.21 partial pressure of o

1.18 A. we know that mole fraction of oxygen in air = 0.21 partial pressure of oxygen(PO2) = PT x YO2 = PT x 0.21 PT = total pressure YO2 = mole fraction of oxygen PO2 = 110mmHg =…

1.2 You are in a poorly ventilated organic chemistry laboratory. Contrary to lab

1.2 You are in a poorly ventilated organic chemistry laboratory. Contrary to laboratory rules, you drink water from an open paper cup in the laboratory! A large bottle of pure tol…

1.2 You are in a poorly ventilated organic chemistry laboratory. Contrary to lab

1.2 You are in a poorly ventilated organic chemistry laboratory. Contrary to laboratory rules, you drink water from an open paper cup in the laboratory! A large bottle of pure tol…

1.2 g of sugar (C_5H_10O_5) are placed in a bomb calorimeter at 298 K and ignite

1.2 g of sugar (C_5H_10O_5) are placed in a bomb calorimeter at 298 K and ignited in the presence of oxygen. The temperature increase measured by the calorimeter is Delta T =1.12 …