Chemical Hazards and Fire Safety

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Questions and Answers

What is the result of a chemical chain reaction in combustion?

Fuel loses electrons and O2 gains electrons, transferring energy to other fuel and oxygen molecules (correct)

Fuel and O2 molecules combine to form a single molecule

Fuel and O2 molecules lose energy

Fuel gains electrons and O2 loses electrons, slowing down the reaction

What type of fires can water be used to extinguish?

Class C fires

Class A and B fires

Class A fires (correct)

Class D fires

What is bonding?

To connect two objects together and to the earth (correct)

physically connecting 2 objects together with a copper wire

To add oxygen to a fire

To create a chemical chain reaction

What is a common source of ignition for fires?

Sparks Signup and view all the answers

what is boiling-liquid expanding vapor explosions

pressurized vessel containing a liquid above it boiling point ruptures in a fire and releases pressurized liquid rapidly into the fire Signup and view all the answers

name the 6 process hazards classification

chemical,physical,mechanical,ergonomic,biological,electrical Signup and view all the answers

What is a common method of preventing dust explosions?

Eliminating places where solids accumulate and vacuuming instead of sweeping Signup and view all the answers

What type of fires involve the ignition of a vapor cloud of flammable material?

Vapor cloud explosions Signup and view all the answers

What is the purpose of inert gases in fire extinguishing?

To displace oxygen and prevent re-ignition Signup and view all the answers

What is an example of a physical hazard?

noise Signup and view all the answers

What type of hazard involves the risk of illness and disease from biological sources?

Biological hazard Signup and view all the answers

What is a common oxidizer in fires?

Oxygen Signup and view all the answers

What is an example of a mechanical hazard?

Cutting hazard Signup and view all the answers

What is an example of an electric hazard?

Contact with live electrical parts Signup and view all the answers

What is an example of an ergonomic hazard?

Repetitive motion Signup and view all the answers

What is an example of a hazard due to processes/environment?

Slip, trip and fall Signup and view all the answers

Study Notes

Chemical Hazards – Fire

Burns and asphyxiation are potential hazards from fire
Chemical chain reaction occurs when fuel and oxygen molecules gain energy, leading to a combustion process
Fuels can be liquids (gasoline, acetone), solids (wood dust, metal particles), or gases (hydrogen, propane)
Oxidizers can be liquids (hydrogen peroxide, nitric acid), solids (metal peroxides, ammonium nitrite), or gases (oxygen, chlorine)
Ignition sources include sparks, flames, heat, and static electricity
Equipment bonding and grounding can prevent static electricity
Fire can be extinguished by removing heat or interrupting the chemical chain reaction

Extinguishing Agents

Water can be used to cool and remove heat
Foam can exclude oxygen from burning liquid fires, but may not be effective if the foam breaks down
Inert gases (carbon dioxide, nitrogen) can displace oxygen and extinguish fires

Chemical Hazards – Explosions

Vapor cloud explosions occur when a vapor cloud of flammable material is ignited
Boiling-Liquid Expanding-Vapor Explosions occur when a pressurized vessel containing a liquid above its boiling point ruptures in a fire
Dust explosions can be prevented by maintaining smooth surfaces, eliminating places where solids accumulate, and using vacuum instead of sweeping

Chemical Hazards – Other Harms

Toxicity can cause harm to health through exposure to toxic vapor clouds
Corrosivity can cause damage to bodily tissues through contact

Physical Hazards

Noise can be a physical hazard
Radiation can be a physical hazard
High pressure or vacuum can be a physical hazard
Heat can be a physical hazard
Vibration can be a physical hazard

Biological Hazards

Viruses can cause illness and diseases in humans
Bacteria can cause illness and diseases in humans
Fungi can cause illness and diseases in humans
Parasitic worms can cause illness and diseases in humans through transmission via insects, animals, and certain plants

Mechanical Hazards

Entanglement hazards occur when a body or clothing encounters moving machine parts
Cutting hazards occur when a machine is used for cutting
Crushing hazards occur when a body part is caught between moving parts of machines

Electric Hazards

Contact with live electrical parts can cause shock and burns
Fire or explosions can occur when electricity is an inherent source of ignition

Ergonomic Hazards

Manual handling can cause harm to the musculoskeletal system
Improper tasks can cause harm to the musculoskeletal system through poor posture, repetitive motion, etc.

Hazards due to Processes/Environment

Slip, trip, and fall hazards can occur due to wet and slippery floors, uncovered cables, uneven steps, poor lighting, and poor housekeeping
Confined space hazards can occur due to limited openings and inadequate ventilation

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Description

Learn about the dangers of chemical fires, including burns, asphyxiation, and chemical chain reactions. Understand the combustion process and the different types of fuels that can contribute to chemical hazards.