Why do you think it is unsafe to smell chemicals by putting the container close to your nose?

Why do you think it is unsafe to smell chemicals by putting the container close to your nose?

When you are in the laboratory and take a direct sniff of the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs. When it is necessary to smell chemicals in the lab, the proper technique is to cup your hand above the container and waft the air toward your face.

Why are chemicals and hot objects never placed directly on the balance pan?

What do you think might be the common cause of fires in lab drawers or lockers? Chemicals and hot objects may damage a balance pan. Why are chemicals and hot objects never placed directly on the balance pan? All lab equipment should be clean, dry and cooled at the end of an experiment.

Why should you keep your hands away from your face during lab?

Why should you keep your hands away from your face during the lab? To prevent a chemical reaction. What should be done with long hair or loose sleeves before starting a lab? Tie back long hair and roll up loose sleeves.

What should you use to touch chemicals?

Always wear gloves and proper equipment to handle chemicals to prevent and burns or other damage. What should you use to touch chemicals? A spatula or spoon allows you to carefully handle and measure chemicals.

Why should you never pipette by mouth?

Do not ever use your mouth to pull the liquid into a pipet. This is the most common method of becoming poisoned in a chemical laboratory or becoming infected in a clinical laboratory. Also, having the bulb attached to the pipet increases the risk of drawing the solution into the bulb. …

What should you do if you spill chemical on your hand?

If you spill an acid or base on your skin, immediately wash well with water. Strong bases react with the oils in your skin to produce a soapy feeling layer. Rinse until well after that feeling is gone. Do not attempt to neutralize a spill on your skin.

What materials should not be placed directly on the balance pan?

Only glass, ceramic, metal or plastic objects and containers should be placed in direct contact with the balance pan. Do not handle objects to be weighed with bare hands. Moisture, grease and dirt on you fingers will affect the weight of the objects. To be weighed accurately, all objects must be at room temperature.

When handling a chemical reagent bottle the following rule should be followed?

1. Carefully read the label twice or three times on any reagent bottle and double check instructions before using any chemical. be sure that it is correct reagent to be used in the experiment. 2.

Do not taste or intentionally sniff chemicals?

Never taste any chemicals-even if it is “just sugar”. 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.

How do you smell chemicals safely?

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. 5. Never pour water into a concentrated acid.

How to be safe in the chemistry laboratory?

Do not touch your face, eyes, or mouth while in laboratory. If you must do so, first wash your hands. Hold chemical containers away from your body. Carefully check the label on the bottle before using its content. Make sure it is the correct chemical and correct concentration. Do not contaminate chemicals

What’s the best way to not contaminate chemicals?

Do not contaminate chemicals Never put your spatula to remove solid chemicals from a bottle. If you do so, you will be contaminating the chemical. Instead, pour solid directly into your container by tilting the bottle and rotating it to control the amount dispensed.

Do you have to wear goggles in the chemistry lab?

State and Federal law require the use of splash proof safety goggles by anyone working in a chemical lab. No student will be allowed to work in the lab or weighing room without wearing the department approved splash-proof safety goggles with side shield, lab apron/coat, and closed toe shoes. There will be no exception to this rule.

Can a student work in the chemistry lab without an instructor?

General Rules of Conduct Students are not permitted in the chemistry lab without the presence of the instructor. No student may work in the lab without the instructor’s supervision. Only the authorized scheduled experiment can be performed in the lab. No unauthorized experiment is allowed.