Answers by visitors named: L.Festinger

1. Decrease the cooling rate, Increase amount of network modifier. 2. The sample described above is composed of SiO2 and B2O3. Neither of these components are network modifiers, so ion exchange does not take place to strengthen the surface of the glass. 3...

e -Neither of these components are network modifiers, so ion exchange does not take place to strengthen the surface of the glass.

@an apply the lever rule.