Last year, the House was in session for 118 days prior to Election Day and 135 days total. In total, Congress passed 65 laws, the fewest in history. With this almost non-existent work schedule, it appears that the record is not only in doubt but could be obliterated.
Rating Newest Oldest. Best Answer: Common glass contains about 70-72 weight % of silicon dioxide (SiO2). The major raw material is sand (or quartz sand) that contains almost 100% of crystalline silica in the form of quartz.
For these reasons, most glassware is made from a borosilicate glass, such as Pyrex or Kimax. Some glassware isn't glass at all, but inert plastic such as Teflon. Each piece of glassware has a name and purpose. Use this photo gallery to learn the names and uses of different types of chemistry laboratory glassware.