Question 1

What information must be included on a chemical label?

Accepted Answer

Chemical labels must display a product identifier showing the chemical's name and alternatives, a signal word indicating hazard severity (warning or danger), hazard statements describing specific risks, precautionary statements for prevention and response, hazard pictograms depicting hazard types, and provider contact information. This standardized labeling ensures all laboratory personnel can quickly identify chemicals and understand associated risks.

Question 2

How do you read and interpret the NFPA 704 diamond label?

Accepted Answer

The NFPA 704 diamond contains four color-coded quadrants rating hazards from 0 (no hazard) to 4 (severe risk). The blue quadrant indicates health hazard, red shows flammability hazard, yellow represents reactivity hazard, and white displays special hazards. Each number reflects the severity level, allowing quick assessment of chemical dangers. The white quadrant may contain additional symbols for specific hazard types.

Question 3

What are the key sections of a Safety Data Sheet and what do they contain?

Accepted Answer

A Safety Data Sheet (SDS) contains 16 sections providing comprehensive chemical information. Sections 1-3 cover identification and hazards; sections 4-6 detail emergency procedures; section 7 addresses handling and storage; section 8 lists protective equipment. Sections 9-11 describe physical properties, stability, and toxicity. Sections 12-15 cover ecological impact, disposal, and transport, while section 16 includes additional relevant information.

Question 4

Why must incompatible chemicals be stored separately?

Accepted Answer

Incompatible chemicals stored together can react dangerously, producing toxic fumes or explosives if accidentally mixed during spills. Segregating chemicals by hazard group—such as acids, bases, flammables, oxidizers, and toxics—prevents these hazardous interactions. Proper separation protects laboratory personnel and prevents property damage or environmental contamination from uncontrolled chemical reactions.

Question 5

What special storage requirements apply to flammable chemicals?

Accepted Answer

Flammable and combustible chemicals must be stored in approved storage cabinets with proper ventilation into a dedicated system. If refrigeration is needed, use only laboratory-grade flammable-safe refrigerators. Keep these chemicals away from acids, bases, ignition sources, oxidizers, and corrosives. Always follow specific instructions in the Safety Data Sheet, and ensure caps are tightly closed to prevent leaks or vapor release.

Question 6

How should pyrophoric substances be handled and stored?

Accepted Answer

Pyrophoric substances ignite spontaneously on contact with air and water, requiring vigorous purging with inert gas before storage. Store them under inert atmosphere using equipment such as a glove box or glove bag. Keep these chemicals completely isolated from flammables, oxidizers, and water. Always consult the Safety Data Sheet for detailed handling procedures and consider watching guidance on handling air and water sensitive chemicals.

Question 7

What precautions should be taken when storing liquid chemicals?

Accepted Answer

Store liquid chemicals in chemically resistant secondary containers to contain leaks or spills. Position containers below shoulder height to prevent dripping onto personnel. Always ensure caps are closed and properly fitted. Keep food and drink away from all storage areas. Follow specific storage instructions from the Safety Data Sheet, and regularly inspect containers for damage or deterioration.

אחסון כימי: קטגוריות, סיכונים ותאימות - חידון הערכה