What will you immediately 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?
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.
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?
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… Lubricating the tubing with water of glycerin. Using a towel or cotton gloves for protection.
Which of the following should not be close to flammable materials?
Lab Safety
| Question | Answer |
|---|---|
| Which of the following should not be close to flammable materials? | a lighted burner |
| A student’s hand is cut during a laboratory. What should the student do immediately? | tell the teacher |
| What should students do before inserting the plug of an electrical device into a socket? | make sure the area is dry |
Why should you never use a CO2 based extinguisher on a person?
The foam extinguisher, also called an ABC extinguisher, can be used for most fires. Never use a CO2 fire extinguisher on a person, as it is extremely cold. Safety shower: Use this to wash yourself in case you come into contact with dangerous chemicals.
What type of footwear is best in the laboratory?
The Clinical Laboratory Standards Institute (CLSI) states, “Shoes should be comfortable, rubber soled, and cover the entire foot. Disposable, fluid-resistant shoe covers can be worn for jobs where splashing is expected. Because canvas shoes will absorb chemicals or infectious fluids, they are not recommended.
Do you shake laboratory thermometers down before use?
Do not “shake down” thermometers or use it as a stirring rod. Thermometers break easily. You must ask for help in cleaning up broken thermometers in order to prevent mercury contamination in the lab.
Do you have to wear an apron in the lab?
The style of protective clothing and the type of materials used should be based on a risk assessment, to provide protection that is relevant to the task at hand and the associated hazards. For most activities in the school science laboratory a lab coat/apron is not required.
Should you hold bottles with your hand over the label while pouring?
When pouring liquid reagents from bottles, hold the bottle with the label against the palm of your hand so that the liquid is poured from the side opposite the label (if any liquid runs down the outside of the label, immediately wipe off the liquid).
What are the 5 lab safety rules?
Lab safety rules: 5 things you need to remember when working in a lab
- Dress appropriately. Before entering the lab, make sure to put on a lab coat.
- Keep a tidy lab.
- Know your lab safety symbols.
- Handle chemical spills properly.
- Know your safety equipment.
Why is oxygen not used in fire extinguishers?
Most fire extinguishers work by separating the fuel from the oxygen. The oxygen comes from the air. It is the same oxygen we breathe. Since the oxygen has to be in contact with the fuel, if you can coat the fuel with something that keeps the oxygen away, the fire will go out.
What should not be worn in the laboratory?
Proper Personal Protective Equipment (PPE) must be worn at all times in the laboratory. 1. Clothing: Wear long pants or skirts and closed toed shoes, and tie back long hair. Do not wear shorts, short skirts, sandals, loose clothing, or dangling jewelry.
Are closed toe shoes PPE?
Protective footwear represents a wide range of foot protection from “Safety-Toe Footwear” to proper work attire such as “Closed-Toe Shoes” (no sandals or open-toed shoes).
Why should you hold a bottle with your hand over the label?
Do you hold bottles with your hand over the label while pouring?
Hold coin-top stoppers between your fingers while pouring. Hold bottles with your hand over the label. Replace stoppers immediately. Keep chemicals away from your face.
How should you smell a substance in lab?
You should never taste anything in the lab unless it is a part of the lab as directed by your teacher. 4. If you need to smell the odor of a chemical, waft or fan the fumes toward your nose with one hand. Do not put your nose over the container and inhale the fumes.
What device is always turned off as we leave the lab?
11. Use a sparker to light a Bunsen burner. Do not use matches. Be sure that all gas valves are turned off and that all hot plates are turned off and unplugged when you leave the lab.
When heating liquids in a test tube you should?
1 Answer. Hold the test tube at an angle. Point the test tube away from yourself and all other people. Heat the test tube gently from the top of the substance being heated, and always wear safety googles.