Chapter 1.4, Problem 23SSC

A

Interpretation Introduction

Interpretation:

The reason why an observer also wears goggles and an apron in the lab is to be summarized.

Concept introduction:

Laboratory or lab is a place that is especially equipped for experimental study in science or for testing and analysis. Various experiments are performed in the lab but with safety measures such as goggles, gloves, apron, etc.

Answer to Problem 23SSC

An observer should also wear goggles and an apron in the lab as he is exposed to chemicals which may harm the eyes.

Explanation of Solution

Safety goggles and apron are usually worn by the person performing an experiment. However, an observer should also wear goggles and apron as they allow the person to handle potentially harmful chemicals without the fear of damaging their eyes or skin from the release of certain gases released from the experiments that are being performed.

B

Interpretation Introduction

Interpretation:

The reason why unused chemicals should not be returned in the stock bottle is to be summarized.

Concept introduction:

Laboratory or lab is a place that is especially equipped for experimental study in science or for testing and analysis.

Answer to Problem 23SSC

Unused chemical compounds should not be put back in the stock as they might have changed their chemical properties when they were exposed to oxygen.

Explanation of Solution

Unused chemicals should not be put back in the stock as some chemicals change their chemical properties when exposed to oxygen. And some glass containers might have some residue from the previous chemical that might increase the rate of cross-contamination.

C

Interpretation Introduction

Interpretation:

The reason why contact lenses should not be worn in the laboratory is to be summarized.

Concept introduction:

Laboratory or lab is a place that is especially equipped for experimental study in science or for testing and analysis.

Answer to Problem 23SSC

Contact lenses should not be worn in the laboratory they absorb vapors easily and cannot be removed easily in the case of emergency.

Explanation of Solution

Contact lenses are thin lenses that are directly placed on the surface of eyes. These are the ocular prosthetic devices. These should not be worn in the laboratory even below the safety glasses as they absorb vapor due to which it is hard to remove them in the case of emergency.

D

Interpretation Introduction

Interpretation:

The reason why the person should avoid wearing loose, draping clothing and dangling jewelry in the laboratory is to be summarized.

Concept introduction:

Laboratory or lab is a place that is especially equipped for experimental study in science or for testing and analysis.

Answer to Problem 23SSC

Loose draping clothes or dangling jewelry should be avoided in the laboratory as there are chances they may get caught in the equipment or the running machine.

Explanation of Solution

The person should avoid wearing loose, draping clothing and dangling jewelry in the laboratory as these are prone to come in contact of ignition or absorption of chemicals and potential entanglement in machinery, and the reaction of the gases with the jewelry might also cause irritation to the skin.