12. Two charged spheres 10 cm apart attract each other with a force of 3.0 x 10-6N. What force results from each of the following changes, considered separately? (a) Both charges are doubled and the distance remains the same. F = Kqi9z 1.2x10-5 (b) The separation is increased to 30 cm. 3.3x10-7 pre dissolved in 875 g of H20, what will be the boiling point of

12. Two charged spheres 10 cm apart attract each other with a force of 3.0 x 10-6N. What force results from each of the following changes, considered separately? (a) Both charges are doubled and the distance remains the same. F = Kqi9z 1.2x10-5 (b) The separation is increased to 30 cm. 3.3x10-7 pre dissolved in 875 g of H20, what will be the boiling point of

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter9: Energy And Chemistry

Section: Chapter Questions

Problem 9.46PAE: 9.46 The heat of fusion of pure silicon is 43.4 kJ/mol. How much energy would be needed to melt a...

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9.46 The heat of fusion of pure silicon is 43.4 kJ/mol. How much energy would be needed to melt a 5.24-g sample of silicon at its melting point of 1693 K?
6-84 (Chemical Connections 6D) What is the chemical formula for the main component of limestone and marble?
Which should have the higher melting point, MgO or NaCl? (a) MgO (b) Nacl
Nickel exhibits a cubic crystal structure with a lattice constant (a) value of 0.353 nm. It has an atomic weight of 58.70 g/mol and a density of 8.83 g/cm3. (a) What is the crystal structure of Ni? (b) Determine its atomic radius in nm. Present your answer in three (3) decimal places.
Examining the crystal structure of CsCl (Caesium Chloride), the Cs+ions form the 8 corners of a cube and the Cl−ion is a the center of the cube. From first-principles calculation, it was determined that the lattice constant of CsCl is 4.209 ̊A. (a) Calculate in detail the electrostatic force exerted by all the Cs+ atoms to the Cl−atom; (b) Assuming that 1 Cs+atom is missing in crystal structure (crystal is said to have a defect), calculate in detail what will be the net electrostatic force on the Cl−ion due to the remaining Cs+ions.
3. (a) The Lattice enthalpy for the solid ionic compound AgBr is +900. kJ/mole. Write the chemical equation that corresponds to the Lattice Enthalpy for AgBr(s) in the space above. Then explain in your own words why this is a large positive number. (b) The hydration enthalpy for AgBris -821 kJ/mole. Write the chemical equation that corresponds to the Hydration Enthalpy for AgBr(s) in the space above. Then explain in your own words why this is a large negative number. (c) Would you expect this compound to be soluble in water? Why/Why not? Calculate anything you need in order to figure this out, and explain your answer.
7. Calculate the atomic concentration (in cm-³) and density (in g/cm³) of the following, using their lattice constants, atomic weights, and Avogadro's number: (a) Si (lattice constant = 5.43 Å; atomic weight = 28.1) (b) Ge (lattice constant = 5.66 Å; atomic weight = 72.6) (c) GaAs (lattice const. = 5.65 Å; atomic weightGa = 69.7; atomic weight As = 74.9) (d) InP (lattice constant = 5.87 Å; atomic weightn = 114.8; atomic weightp = 31) %3D %3D %3D %3D
3. (a) The Lattice enthalpy for the solid ionic compound AgBr is +900. kJ/mole. Write the chemical equation that corresponds to the Lattice Enthalpy for AgBr(s) in the space above. Then explain in your own words why this is a large positive number. (b) The hydration enthalpy for AgBr is -821 kJ/mole. Write the chemical equation that corresponds to the Hydration Enthalpy for AgBr(s) in the space above. Then explain in your own words why this is a large negative number.…
Calculate the atomic concentration (in cm¯³) and density (in g/cm³) of the following, using their lattice constants, atomic weights, and Avogadro's number: (a) Si (lattice constant = 5.43 Å; atomic weight = 28.1) (b) Ge (lattice constant = 5.66 Ä; atomic weight = (c) GaAs (lattice const. = 5.65 Å; atomic weightGa = 69.7; atomic weight As = 74.9) 72.6) %3D %3D %3D
The normal boiling point of a liquid is (a) the temperature at which the vapor pressure equals 1 atm. (b) the temperature at which the gas molecules have more kinetic energy than the molecules in the liquid. (c) the only temperature at which there can be equilibrium between liquid and gas. (d) the temperature at which the liquid will usually boil.
At a steelworks, molten iron is heated to1500° Celsius to remove impurities. It is most accurate to say that the molten ironcontains a large amount of (i) temperature;(ii) heat; (iii) energy; (iv) two of these; (v) allthree of these.
Consider the force of interaction between a cation and an anion. Which of the following does not make the force more attractive? (Recall Coulomb’s law has the formula F = kq1q2/(εr2). Choose one of the following: Change the charge on the anion so that it is less negative Decrease the distance between the ions Increase the charge on the cation so that it is more positive Decrease the dielectric constant of the fluid between the ions All of the other answer choices listed make the force more attractive