How do you replace a frost plug?
How to Replace Freeze Plugs in Engines
- Drain the antifreeze from your car so it doesn’t spill on the ground when you remove the freeze plug.
- Remove the parts blocking your way to the freeze plugs.
- Break the freeze plug free.
- Remove the freeze plug.
- Clean the hole that the freeze plug came out of.
What would happen if you did not use a stopper in reaction A?
Without the hole there would be a buildupof pressure within the tube, which would result in the tube cracking or exploding. If the cage was placed close to the stopper the gas could possibly escape through the hole and the stopper. Thus, resulting in a source of error causing the result to be invalid. 3.
Why do you need to wait another 1 2 minutes after attaching the stopper before you collect oxygen?
Why do you need to wait another 1-2 minutes after attaching the stopper before you collect oxygen? You should not create seal because the water is displaced by the oxygen collected, and if there is no opening the water cannot flow out of the tube.
Why is it necessary to have a hole in the stopper Why not just leave the whole top of the flask open or close it off all the way?
That means “low pressure.” The air pressure outside the bottle is higher, so it actually tries to push into the bottle through the bottom hole. In doing so, it keeps the water in! When you release the hole on the top, there is no vacuum, so the water is free to flow out the hole into your sink.
How do you hold and move a flask if you are mixing chemicals?
While mixing chemicals, always hold the flasks straight right in front of you with the help of a crucible tong or a test tube holder and move straight.
How should you hold the stopper when removing chemicals from a flask?
The stopper of the reagent bottle should be held during transfer or, if it is flat, placed upside down on the counter. Carefully pour the amount of reagent that you will need, not extra, into the beaker and then close the reagent bottle.
How or when is a glass tubing removed from rubber stoppers?
The glass tubing will stay in). If the glass tubing is to be removed from the stopper, it should be done immediately after the experiment is completed.
What is a safe way to read a burette that is above your eye level?
Lab Safety Quiz
| Question | Answer |
|---|---|
| What is a safe way to read a burette that is above your eye level? | Lower it to your level or heighten yourself to its level by a stool |
| Is the lab a safe place to eat/drink/apply makeup, why? | No, because chemicals can contaminate it |
What do you do if a laboratory fire erupts?
If a laboratory fire erupts, immediately? notify your instructor. When are eye protection devices (such as goggles) worn in the laboratory? any time chemicals, heat or glassware are used.
Why should you never touch chemicals with your hands?
Do not touch chemicals with you hands. Some chemical reagents readily pass through the skin barrier into the bloodstream and can cause serious health problems. Some chemicals are extremely corrosive. Always wear gloves, apron, and safety goggles when handling chemicals.
When should a fume hood be used?
Fume hoods should be used when working with toxic compounds or compounds with a boiling point below 120°C. Fume hoods, or other effective local ventilation, must be provided and used when the materials used will exceed exposure limits in the laboratory.
Why should you never leave an experiment unattended?
Equipment and experiments that run unattended during the day and overnight have the potential of causing significant problems and harm to University personnel, facilities, and equipment.