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Glass tempering can be accomplished by both thermal and chemical means. Each puts the near surface region of the glass piece into compression, thereby suppressing growth of surface cracks. The thermal process involves cooling the surface of a molten piece of glass more rapidly than the interior. The chemical process is accomplished by diffusing impurity cations into the near surface region. For soda glass, an impurity cation replaces a Na+ cation. Based on ionic radii and ionic charge, which of the following cations are good candidates for chemical tempering? Select as many as appropriate. Note: For Na+, rionic = 0.102 nm. 1. Al3+ (rionic = 0.053 nm) 2. Ba2+ (rionic = 0.136 nm) 3. Ca2+ (rionic = 0.100 nm) 4. Cs+ (rionic = 0.170 nm) 5. Fe2+ (rionic = 0.077 nm) 6. K+ (rionic = 0.138 nm) 7. Ti4+ (rionic = 0.061 nm)
List the individual steps used in constructing a Born - Haber cycle for the formation of barium iodide (BaI2) from the elements. Which of the steps would you expect to be exothermic
Show the products of each reaction and indicate which pair of reactants will result in a precipitation reaction? A) Ba(NO3)2(aq) + Na2CO3(aq)
calculate the mass of agcl and h2s formed when 85.6 g of ag2s reacts with excess hcl.
What volume of NaOH is needed to reach the end point of the titration? What was the initial concentration of HCl?
spheres that detect glucose have a diameter of 10nm and are tightly packed into patches. Calculate the number of spheres in a 3-d patch of spheres that is 3mm high and has an area of 6mm^2.
A 1-L flask is filled with 1.10 g of argon at 25 C. A sample of ethane vapor is added to the same flask until the total pressure is 1.20 atm . What is the partial pressure of argon,PAr , in the flask?
a corrosion technologist pipetted a 100 ml hard water sample and titrated it with 37.64 ml of 0.01 M EDTA solution for a total endpoint, and 29.32 ml of 0.01 M EDTA solution for a calcium endpoint.
A person ate 0.919 pound of cheese (an energy intake of 7350 kJ). Suppose that none of the energy was stored in his body. What mass (in grams) of water would he need to perspire in order to maintain his original temperature? (It takes 44.0 kJ to v..
Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 4.00 MJ of energy (in the form of heat) if the temperature of the sodium is not to increase by more than 10.0 °C? Use CP = 30.8 ..
attractive interaction among the molecules of a gas are more important than repulsive interactions, it's fugacity coefficient is less than
Calculate the partition coefficient of caffeine between water and each of the other three solvents. Which of these three organic solvents would be the best choice for extracting caffeine from an aqueous solution?
The standard enthalpy of formation of gaseous H2O at 298 K is -241.82 kJ mol-1. Estimate its value at 75 °C given the following values of the molar heat capacities at constant pressure:
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