Context and question: The alkali metal ions are small and mobile; their presence in glass allows a degree of electrical conductivity, especially in molten state or at high temperature. Their mobility decreases the chemical resistance of the glass, allowing leaching by water and facilitating corrosion. Alkaline earth ions, with their two positive charges and requirement for two non-bridging oxygen ions to compensate for their charge, are much less mobile themselves and also hinder diffusion of other ions, especially the alkalis. The most common commercial glasses contain both alkali and alkaline earth ions (usually sodium and calcium), for easier processing and satisfying corrosion resistance. Corrosion resistance of glass can be achieved by dealkalization, removal of the alkali ions from the glass surface by reaction with e.g. sulfur or fluorine compounds. Presence of alkaline metal ions has also detrimental effect to the loss tangent of the glass, and to its electrical resistance; glasses for electronics (sealing, vacuum tubes, lamps...) have to take this in account.
Reaction with what causes dealkalization?
Answer: sulfur or fluorine compounds
Context and question: Eisenhower told District of Columbia officials to make Washington a model for the rest of the country in integrating black and white public school children. He proposed to Congress the Civil Rights Act of 1957 and of 1960 and signed those acts into law. The 1957 act for the first time established a permanent civil rights office inside the Justice Department and a Civil Rights Commission to hear testimony about abuses of voting rights. Although both acts were much weaker than subsequent civil rights legislation, they constituted the first significant civil rights acts since 1875.
Under the Civil Rights Act of 1957, what federal department contained a civil rights office?
Answer: Justice
Context and question: In 1986, Michael Dell brought in Lee Walker, a 51-year-old venture capitalist, as president and chief operating officer, to serve as Michael's mentor and implement Michael's ideas for growing the company. Walker was also instrumental in recruiting members to the board of directors when the company went public in 1988. Walker retired in 1990 due to health, and Michael Dell hired Morton Meyerson, former CEO and president of Electronic Data Systems to transform the company from a fast-growing medium-sized firm into a billion-dollar enterprise.
What was Morton Meyerson's position at his former company?
Answer:
CEO