CHM lab 161 midterm

Your lab partner

Which is NOT a good source of information about the hazards that affect waste disposal in a chemistry lab?

Before handling any glassware or chemicals for the experiment

Determine when to put on disposable gloves for work in the lab.

Estimate one digit past the smallest precisely known digit or marking.

How do you determine the last digit in any measured number?

Become familiar with the chemicals to be used, including exposure or spill hazards. Locate the spill kits and understand how they are used.

How should students prepare to use chemicals in the lab?

Check and see if anyone else can use the chemical. If not, discard in the proper waste container.

A student removes a chemical sample from a reagent bottle to be used in an experiment. What should he do with any excess chemical remaining from this sample after the experiment is complete?

Being familiar with how safety equipment is used Knowing what safety equipment is available Understanding where the safety equipment is located

All lab participants must remain prepared to use safety equipment in case of emergency. Identify the components of effective preparation.

Wear corrective glasses or lenses under your safety goggles for the whole experiment, but always check with your TA or Instructor for your school's policy

Determine the safest option in the lab if you need your vision to be corrected.

When everyone in the room is done handling any chemicals or glassware

Determine when you should remove your goggles in the lab room.

Do not block a door with an EXIT sign. Locate the exits prior to the start of lab.

Identify the precautions to take with exits in the lab.

How the incident happened Any chemicals involved in an incident Any other hazards present in the lab

Identify the types of information that are necessary to communicate with emergency responders.

Contact your TA or instructor to adjust the balance

What should you do if you are using a balance that has persistent fluctuations in mass?

Always wear appropriate Personal Protective Equipment. Check labels or instructions before any disposal.

What are the best practices for safely handling waste in the lab?

Pour some of the reagent from the bottle into a beaker, then use as needed in the procedure.

What is generally the best approach when liquid from a large reagent bottle is needed in an experiment?

Visually check that the gas cylinder is restrained but keep a safe distance from it.

What is the main precaution to take if a Gas Cylinder sign is present in the lab?

To help evenly distribute heat throughout the solution

What is the purpose of stirring a solution while it is being heated?