Chemistry concepts and calculations

1. The element silicon has 3 isotopes with the masses and natural abundances sho

1. The element silicon has 3 isotopes with the masses and natural abundances shown in the table. Mass of Isotope Natural abundance 27.97693 92.23 28.97649 4.67 29.97376 3.10 What …

1. The element silicon would be expected to form_______ covalent bond(s) in orde

1. The element silicon would be expected to form_______ covalent bond(s) in order to obey the octet rule. Use the octet rule to predict the formula of the compound that would form…

1. The element silicon would be expected to form_______ covalent bond(s) in orde

1. The element silicon would be expected to form_______ covalent bond(s) in order to obey the octet rule. Use the octet rule to predict the formula of the compound that would form…

1. The energy needed to dissociate an oxygen molecule into oxygen atoms (the bon

1. The energy needed to dissociate an oxygen molecule into oxygen atoms (the bond energy) is 498 k,J / mol. What is the maximum wavelength of light that will initiate the split of…

1. The energy needed to dissociate an oxygen molecule into oxygen atoms (the bon

1. The energy needed to dissociate an oxygen molecule into oxygen atoms (the bond energy) is 498 k,J / mol. What is the maximum wavelength of light that will initiate the split of…

1. The energy needed to form an activated complex is called a. collision energy

1. The energy needed to form an activated complex is called a. collision energy d. activation energy b. kinetie energy e. potential energy 2. A proposed mechanism for the decompos…

1. The energy released during the chain of electron transport molecules is used

1. The energy released during the chain of electron transport molecules is used to create a(n) ____gradient across the inner mitochondrial membrane for chemiosmosis. a.oxugen b.AD…

1. The energy released during the chain of electron transport molecules is used

1. The energy released during the chain of electron transport molecules is used to create a(n) ____gradient across the inner mitochondrial membrane for chemiosmosis. a.oxugen b.AD…

1. The energy required to boil a liquid is much larger than the energy required

1. The energy required to boil a liquid is much larger than the energy required to melt a solid. Why does it take so much more energy to boil a liquid than to melt a solid? 2. Out…

1. The enthalpy of combustion (H° c ) of 1-tert-butoxybutane (C 8 H 18 O) is -53

1. The enthalpy of combustion (H°c) of 1-tert-butoxybutane (C8H18O) is -5317.30 kJ/mol. Using the appropriate information given below, calculate the enthalpy of formation (H°f), i…

1. The enthalpy of combustion (H° c ) of cinnamic acid (C 9 H 8 O 2 ) is -4359.3

1. The enthalpy of combustion (H°c) of cinnamic acid (C9H8O2) is -4359.30 kJ/mol. Using the appropriate information given below, calculate the enthalpy of formation (H°f), in kJ/m…

1. The enthalpy of the reaction 2 CH3OH(l) + 3O2(g) arrow 2 C02(g) + 4 H2O(l) is

1. The enthalpy of the reaction 2 CH3OH(l) + 3O2(g) arrow 2 C02(g) + 4 H2O(l) is -1452.8 k). A quantity of 453.6 g of liquid methanol is burned under constant pressure conditions.…

1. The environmental justice movement is a________________________ movement deal

1. The environmental justice movement is a________________________ movement dealing with food distribution, pollution and climate change. multicultural white middle class only Nat…

1. The equilbrium constant for the water-gas shift reaction is 5.0 at 400 o C: C

1. The equilbrium constant for the water-gas shift reaction is 5.0 at 400 oC: CO(g) + H2O(g) ? CO2(g) + H2(g) Determine Qc if the following amounts (in moles) of each component is…

1. The equilibrium constant for the reaction 2A 3B is 2.3. If the initial concen

1. The equilibrium constant for the reaction 2A 3B is 2.3. If the initial concentrations of A and B are [A] = 0.10 M and [B] = 0.050 M, which of the following statements is true? …

1. The equilibrium constant is given for two of the reactions below. Determine t

1. The equilibrium constant is given for two of the reactions below. Determine the value of the missing equilibrium constant. 2A(g) + B(g) ? A2B(g) Kc = ? A2B(g) + B(g) ? A2B2(g) …

1. The equilibrium constant, Kp, for the following reaction is 1.04 x 10^-2 at 5

1. The equilibrium constant, Kp, for the following reaction is 1.04 x 10^-2 at 548 K NH4Cl <------>NH3 + HCl If an equilibrium mixture of three compounds in a 4.06 L contain…

1. The equilibrium pressures for reaction of decomposition of N 2 O 4 to 2 NO 2

1.     The equilibrium pressures for reaction of decomposition of N2O4 to 2 NO2 are 0.58 bar and 1.6 bar respectively at room temperature. If the volume of the container is reduce…

1. The equivalence point of a titration of a weak base with strong acid is 6.24,

1. The equivalence point of a titration of a weak base with strong acid is 6.24, and the titration curve drops steeply from pH 7 to 5. Which of the following indicators will NOT b…

1. The figure shows a section of a circuit. The resistances are R 1 = 2.1 ?, R 2

1. The figure shows a section of a circuit. The resistances are R1 = 2.1 ?, R2 = 5.0 ?, and R3 = 6.9 ?, and the indicated current is i = 6.5 A. The electric potential difference b…

1. The first law of thermodynamics can be given as ________ [A] E = q + w [B] fo

1. The first law of thermodynamics can be given as ________ [A] E=q+w [B] for any spontaneous process, the entropy of the universe increases [C] the entropy of a pure crystalline …

1. The first step in the free radical chain reaction is: A. two radical species

1. The first step in the free radical chain reaction is: A. two radical species coming together to form a stablemolecule B. a radical combines with the wall of the container C. ha…

1. The first step of the model requires the preparation of a phosphate buffer wh

1. The first step of the model requires the preparation of a phosphate buffer whose initial pH o t are added to 1.0 I 7.45 will drop by only 0.2 pH units when 0.020 moles of H buf…

1. The fluid exiting a chromatographic column is called the (a) eluent. (b) elua

1. The fluid exiting a chromatographic column is called the (a) eluent. (b) eluate (c) analyte. 2. Which is the most common carrier gas for gas chromatography? (a) helium (b) nitr…

1. The following are the vapor pressures of some relatively common chemicals mea

1. The following are the vapor pressures of some relatively common chemicals measured at 20 °C: Arrange these substances in order of increasing boiling point. 2. At 0.00 °C, hexan…

1. The following are values of heat capacity for nitrogen gas: Using the general

1. The following are values of heat capacity for nitrogen gas: Using the general formula, Cv= A+BT+ C/T2, find values for A, B, and C that fit the given data. 2. Two common proper…

1. The following cell is made at 25 o C. Which of the equations below could be u

1. The following cell is made at 25oC. Which of the equations below could be used to calculate E for this cell? Mn(s), Mn2+ (0.050M), Fe3+ (0.10M), Fe2+ (0.20M) 2. A concentration…

1. The following data were analyzed: x, y 2, 37.5 4, 9.4 6, 4.2 8, 2.3 10, 1.5 A

1. The following data were analyzed: x, y 2, 37.5 4, 9.4 6, 4.2 8, 2.3 10, 1.5 A plot of y vs. x does NOT yield a straight line. Further analysis showed the data fit the following…

1. The following data were collected at 20 °C for the reactio n below Acetone +

1. The following data were collected at 20 °C for the reactio n below Acetone + H+ + Br,-- + bromoacetone The ti time to uce a small but constant amount of bromoacetone was measur…

1. The following equation represents the partial combustion of methane, CH 4 . 2

1. The following equation represents the partial combustion of methane, CH4. 2CH4(g) + 3O2(g)    2CO(g) + 4H2O(g) At constant temperature and pressure, what is the maximum volume …

1. The following five proteins, which are listed with their molecular weights an

1. The following five proteins, which are listed with their molecular weights and isoelectric points, were separated by sDs-polyacrylamide gel electrophoresis. Give the order of t…

1. The following five proteins, which are listed with their molecular weights an

1. The following five proteins, which are listed with their molecular weights and isoelectric points, were separated by sDs-polyacrylamide gel electrophoresis. Give the order of t…

1. The following flowchart is correct but not structured. Describe in words what

1.   The following flowchart is correct but not structured. Describe in words what the following flowchart does. Do not simply restate what each flowchart symbol does. You should …

1. The following information is given for aluminum at 1atm: A 46.90 g sample of

1. The following information is given for aluminum at 1atm: A 46.90 g sample of liquid aluminum at 977.0 °C is poured into a mold and allowed to cool to 22.0 °C. How many kJ of en…

1. The following information is given for mercury at 1 atm: A 43.80 g sample of

1. The following information is given for mercury at 1 atm: A 43.80 g sample of liquid mercury is initially at 223.80 °C. If the sample is heated at constant pressure (P = 1 atm),…

1. The following is a polypeptide with the sequence given. Identify the amino ac

1. The following is a polypeptide with the sequence given. Identify the amino acids region that would be most likely form a transmembrane alpha Helix in the sequence. It should be…

1. The following is an empiricalequation describing the loss of pressure through

1. The following is an empiricalequation describing the loss of pressure through a packedcolumn: P=2.15(0.15N0.85v1.85/D1.15) where: P = Pressure loss, N /m2 = Fluid viscosity, kg…

1. The following is the equation for the formation of the ammonia complex of Cu^

1. The following is the equation for the formation of the ammonia complex of Cu^+2 Cu^2+(aq) + 4NH2(aq)? Cu(NH3)4^2+(aq) if at equilibrium the concentration of Cu^2+ is 1.0 x 10^-…

1. The following kinetic data were obtained for the reaction NO2 (g) + O3 (g) ?

1. The following kinetic data were obtained for the reaction NO2 (g) + O3 (g) ? NO3 (g) + O2 (g) Experiment [NO2], M [O3], M initial rate (M/s) 1) 0.21 x 10-3, 0.70 x 10-3 6.3 x 1…

1. The following kinetic data were obtained for the reaction NO2 (g) + O3 (g) ?

1. The following kinetic data were obtained for the reaction NO2 (g) + O3 (g) ? NO3 (g) + O2 (g) Experiment [NO2], M [O3], M initial rate (M/s) 1) 0.21 x 10-3, 0.70 x 10-3 6.3 x 1…

1. The following news release from CNN describes a software feature whose proper

1. The following news release from CNN describes a software feature whose proper implementation might have prevented the crash of Korean Air Lines ?ight 801 in Guam in August 1997…

1. The following oxidation and reduction half-reactions are possible for the ele

1. The following oxidation and reduction half-reactions are possible for the electrolysis of potassium iodide solution. The solution contains water molecules, potassium ions (K+),…

1. The following parameters were measured in methanol at 30\'C for the reactions

1. The following parameters were measured in methanol at 30'C for the reactions Complex XNO, trans7.35 49.3 55.2 53.9 -94 -8.8 -19.8 13.6 0.150 X-Cl, trans 0.53 -100 What mechanis…

1. The following question refers to a 2.0-liter buffered solution created from 1

1. The following question refers to a 2.0-liter buffered solution created from 1.30 M NH3 (Kb = 1.8 × 10–5) and 0.26 M NH4F. When 0.10 mol of H+ ions is added to the solution what…

1. The following reaction has achieved equilibrium. Predict the effect on the fo

1. The following reaction has achieved equilibrium. Predict the effect on the formation of phosphorous pentachloride (increase, decrease or no effect) for the stated changes to th…

1. The following reaction is done at 298.15 K and 1 atm: N2H4 (l) + CH3OH (l) CH

1. The following reaction is done at 298.15 K and 1 atm: N2H4 (l) + CH3OH (l) CH2O (g) + N2(g) + 3H2 (g)        Horxn  = -37 kJ How much work is done? The answer should be -12.5. …

1. The following reaction occurs in a closed container: A(g)+2B(g)>>2C(g) A reac

1. The following reaction occurs in a closed container: A(g)+2B(g)>>2C(g) A reaction mixture initially contains 1.3L of A and 2.2L of B. Assuming that the volume and tempera…

1. The following reaction was carried out in a 3.75 L reaction vessel at 1100 K:

1. The following reaction was carried out in a 3.75 L reaction vessel at 1100 K: C(s)+H2O(g)CO(g)+H2(g) If during the course of the reaction, the vessel is found to contain 9.25 m…

1. The following reaction was carried out in a 4.00L reaction vessel at 1100 K:

1. The following reaction was carried out in a 4.00L reaction vessel at 1100 K: C(s)+H2O(g)?CO(g)+H2(g) If during the course of the reaction, the vessel is found to contain 6.50mo…

1. The following results were collected for two experiments involving the reacti

1. The following results were collected for two experiments involving the reaction at 600 oC between gaseous sulfur dioxide and oxygen to from gaseous sulfur trioxide. Experiment …