Intro to Chem 1 Lab

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

1. Always wear PPE 2. Check labels or instructions before disposal

What should you do after finishing work with a reagent bottle? Select one or more:

1. Close the bottle 2. Return to proper storage location

Which types of signs are posted to convey information about chemical storage?

1. Hazard signs such as "Flammable," "Oxidizer," and "Corrosive" 2. National Fire Protection Association (NFPA) 3. Gas Cylinder sign

Identify effective techniques for accurate pipet use. Select all that apply.

1. Measure the liquid by aligning the meniscus with the volume line 2. Do not let liquid enter the bulb or pump

Choose the most appropriate task for each pictured piece of glassware.

(Pouring/holding)

When you are done using most glassware in the lab, what should you do? Select one or more:

1. Return the glassware to the appropriate location to dry. 2. Dispose of any chemicals in the proper waste container 3. Clean the glassware with a detergent solution.

Which signs are typically posted in areas of active lab work?

1. Sign prohibiting food and drink 2. PPE 3. Safety equipment 4. Chemical storage (All of the above)

Which of the following safety equipment is in the lab?

1. Spill supplies 2. Safety shower 3. Eye wash 4. Fire extinguisher (All of the above)

Which steps are necessary for cleaning a spill involving broken glass?

1. Stop the spread 2. Soak up any spilled liquid 3. Pick up large pieces of glass

In case of accidental contact with chemicals, how long should the eyes be flushed at the eyewash station?

15 minutes

Suppose you are performing a titration. At the beginning of the titration, you read the titrant volume as 2.99 mL. After running the titration and reaching the endpoint, you read the titrant volume as 25.61 mL. What volume, in mL, of titrant was required for the titration?

22.62 mL

What is the correct reading of the volume in the pictured buret? Make sure to report your reading with the appropriate significant figures.

39.95 mL

What information does not need to be included on a chemical waste label?

A description of the experiment the chemicals were used for

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?

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

Identify the step that is not recommended when responding to an emergency.

Gather your belongings

What action is NOT necessary before lighting a Bunsen burner?

Leave the gas cock open for a few minutes before lighting to clear the line.

What practice will not help you make an accurate volume reading on a buret at the beginning of a titration?

Make sure that the meniscus starts exactly at 0.00 mL.

What is the first step for response to an emergency situation?

Remain calm and quiet, gather information, and assess the situation.

What should you do every time before you leave lab?

Remove lab coat, wash hands, remove gloves.

Determine which of the following statements is true.

Students are not permitted, at any time, to work alone in lab.

What should you do if your Bunsen burner does not light after a few tries with the striker?

Turn off the gas cock for 10 seconds before trying again.

In lab, you may need to evaluate the odor or smell of a chemical. What is the best way to smell a chemical sample

Use your hand to gently waft the smell toward you.

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

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

What is the last step of any spill cleanup procedure?

Wipe down the affected area with detergent and water.

Read each statement regarding food and beverages in the lab and determine if each is true or false. a) Chewing gum is okay in the lab as long as you don't blow bubbles. b) Tobacco products of all kinds are prohibited in lab. c) Beverages are allowed in lab as long as they are in containers with lids. d) Food items should not be brought into the lab.

a) False b) True c) False d) True

Match each lab incident to the item of PPE that will protect you from it. Each item of PPE will only be used once. a) While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench. b) While picking up a buret, an unknown solution left by a previous solution drips onto your hand. c) While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor. d) While checking on a stirring solution, the solution splashes up towards your face.

a) Lab coat b) gloves c) shoes d) goggles

a) After the liquid is drained from the pipet, the final drop is pushed through with the pipet bulb. b) Pipets are washed with detergent and then put to use immediately. c) The pipet is not cleaned thoroughly between uses. d) Air bubbles are present as the liquid is drawn up into the pipet and dispensed. e) The liquid level in a pipet is read from the top of the curve rather than the meniscus.

a) accuracy b) contamination c) contamination d) accuracy e) accuracy

Identify the equipment best suited for extinguishing each type of fire. a) Large fire on floor b) clothing fire c) small bench top fire

a) fire extinguisher b) fire blanket c) overturned beaker

Determine the best way to deal with each of the following items that may dangle into the way during lab work. a) Flowy sleeves b) loose bracelets c) long hair d) long earrings e) long necklaces

a) tie back b) remove c) tie back d) remove e) remove

In order to use a pipet, place a ____ at the top of the pipet. Use this object to fill the pipet such that the _____ of the liquid is even with the volume line. Release the liquid, touching the tip of the pipet to the side of the container if necessary to release the last drop ____ the pipet tip.

bulb or pump, meniscus, outside

When an alarm sounds in the laboratory, it is important to respond ____ and remain ____ Listen for any other instructions, turn off any ____ in use, and be prepared to leave immediately.

calmly, quiet, equipment

When using a clamp to secure a flask to a ring stand, begin by choosing a ring stand and clamp that are appropriately sized for the _____. Position the clamp directly _____ the base of the ring stand. Turn the knobs of the clamp, making sure not to _____ the clamp around any glassware.

glassware, above, overtighten

To condition the buret, add a small volume of _____ to the buret and rotate the barrel at ______ so that the liquid makes contact with the full inner surface of the barrel. Complete this action _____ and discard each volume in a designated waste container.

of the titrant, at an angle close to horizontal, two more times

Suppose you light a Bunsen burner and notice that the flame is very yellow and too short. To get a blue flame, you should _____ the _____ further. To increase the size of the flame, you should ____ the _____further.

open, air inlet, open, gas regulator

Move to the safety shower if you spill hazardous chemicals on your _______. Stand under the shower and ______ the lever. Remove clothing and continue flushing the area for _____.

skin or clothing, pull, 15 minutes