lab equipments

• Beakers hold solids or liquids that will not release gases when reacted or are unlikely to splatter if stirred or heated.
• Beaker tongs are used to move beakers containing hot liquids
• Erlenmeyer flasks hold solids or liquids that may release gases during a reaction or that are likely to splatter if stirred or heated.
• Florence Flask: Rarely used in first year chemistry, it is used for

  the mixing of chemicals. Narrow neck prevents splash exposure.
• A graduated cylinder is used to measure volumes of liquids.
• A test tube holder is useful for holding a test tube which is too hot to handle.
• Test tube brushes are used to clean test tubes and graduated cylinders.
• TRUE OR FALSE

  Forcing a large brush into a small test tube will often break the tube.

  TRUE
• Test tube racks are for holding and organizing test tubes on the laboratory counter.
• After washing flip the test tube over on a wooden peg to dry.
• Rubber stoppers are used to close containers to avoid spillage or contamination.
• TRUE OR FALSE

  Containers should always be heated when there is a stopper in place.

  FALSE
• Spot plates are used when we want to perform many small scale reactions at one time.
• A glass stir rod is used to manually stir solutions. It can also be used to transfer a single drop of a solution.
• Forceps (or tweezers) are used to pick up small objects.
• A funnel is used to aid in the transfer of liquid from one vessel to another
• A watch glass is used to hold a small amount of solid, such as the product of a reaction.
• A wash bottle has a spout that delivers a wash solution to a specific area.
• Distilled water is the only liquid that should be used in a wash bottle.
• Weighing boats are used to weigh solids that will be transferred to another vessel.
• Bunsen burners are used for the heating of nonvolatile liquids and solids.
• Strikers are used to light Bunsen burners.
• The evaporating dish is used for the heating of stable solid compounds and elements.
• Crucibles are used for heating certain solids, particularly metals, to very high temperatures.
• The clay triangle is used as a support for porcelain crucibles when being heated over a Bunsen burner.
• CRUCIBLE TONGS: For handling hot crucibles; also used to pick up other hot objects.
• TRUE OR FALSE

  Crucible tongs are used for picking up beakers

  FALSE
• Ringstands are a safe and convenient way to perform reactions that require heating using a Bunsen burner.
• Utility clamps are used to secure test tubes, distillation columns, and burets to the ringstand.
• Ringstands and their Components:

  
  

  utility clamps

  iron ring

  wire gauze

  double buret clamps
• Wire gauze sits on the iron ring to provide a place to stand a beaker.
• Double Buret clamps are used to burets – long graduated tubes used in titration.
• Iron rings connect to a ringstand and provide a stable, elevated platform for the reaction.
• Triangular files are used primarily to cut glass rod, a skill that your instructor will share with you when it becomes useful.
• Red litmus paper is used to identify bases.
• Blue litmus paper is used to identify acids.
• We use gas collecting bottles when large volumes of gases are produced, and must be collected by the displacement of water.
• A medicine dropper is used to transfer a small volume of liquid (less than one mL).
• On top of each medicine dropper is a “rubber bulb”
• A Mohr pipet measures and delivers exact volumes of liquids.