Do you want to place a piece of glass tubing into a rubber stopper after the tubing has been fire polished and cold this is best done by? 12. You want to place a piece of glass tubing into a rubber stopper after the tubing has been fire polished and cooled. This is best done by A. lubricating the tubing with water or glycerin.
Do you return all unused chemicals to their original containers? 7. Never return unused chemicals to the reagent bottles. This is a source of possible contamination of the entire contents of the stock bottle.
Which is correct lab safety? Avoid direct contact with any chemical. Never smell, inhale or taste laboratory chemicals. Always wash hands and arms with soap and water after removing gloves and before leaving the work area. Never eat, drink, chew gum or tobacco, smoke or apply cosmetics in the laboratory.
What is the correct answer to the following statement you should always pipette by mouth? What is the correct answer to the following statement: You should always pipette by mouth. Always – it is a fast and efficient method for transferring liquids in the lab. Only when you can’t find a pipette bulb or think it might be dirty.