应用化学专业英语 教学课件 ppt 作者 黄忠 谢普会 付颖 主编lesson 26 common labware 1课件.ppt

Beaker(s) Erlenmeyer flask 96-well spot plate Chemical Forceps Desiccator Buchner funnel and side arm filter flask Fume Hood Used for experiments Or chemicals that Give off noxious odors Wash bottle Material: flexible plastic Use: hold vertically and squeeze sides to dispense water, typically deionized water only Test tube rack Material: wood, plastic or metal Use: holds test tubes in a vertical position Filter Paper Material: paper circles, various sizes Use: folded in quarters, used in funnels to filter solutions Weighing Trays or Weigh Boats Material: Flexible plastic in various sizes Use: to keep chemicals off the balance pan. 24-well spot plate Material: plastic, may have cover Use: reaction vessels for small quantities of solution Transfer Pipet Material: plastic Use: to dispense and transfer small volumes of solution Hot Plate Use: to heat substances when a burner is not necessary or safe. Sometimes may have a magnetic stirrer as well. Material: metal with porcelain top Ring clamp and clamp holder Material: metal Use: as a support on a ring stand 24-well spot plate Watch glass Material: glass Use: to cover an evaporating dish or beaker Electronic Balance Use: to mass less than 200 grams of a substance Important: Easily broken by placing too much mass on the pan Safety Goggles Material: plastic, splash resistant Use: to be worn at all times during labs in which chemicals, heat or glassware is used. Test tube clamp or test tube holder Material: metal spring mechanism Use: to hold test tubes or glass tubing Crucible tongs Material: iron, nickel or brass Use: to pick up and hold small usually very hot items Important: beware of hot porcelain or glassware Mortar and Pestle Material: porcelain Use: to grind crystals and lumpy chemicals to a powder Graduated cylinder or graduate Material: glass or plastic, various sizes Use: to measure approximate volumes Important: Never heat Buret Double buret clamp Stopcock Material: glass with stopcock, graduated, VERY