Math/Chem Associate Safety Professional Cert

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What is a class A fire?

Ordinary combustibles wood, paper, cloth, trash, plastic

What 3 chemicals does fire involve?

Oxygen, heat, and fuel

How many classifications of fire are there?

5 Class A, B, C, D, K

What pH indicates a neutral solution?

7

A large exposure in a short time is called what?

Acute toxicity

What is electric current measured in?

Amps (A)

What substance fire extinguishers are used for class B & C fires?

Carbon dioxide, clean agent, halogenated

Low level exposure for a long period of time

Chronic toxicity

What is a class D fire

Combustible metals like potassium, sodium, aluminum, magnesium

Dose =

Concentration x Time

What is a class K fire?

Cooking oils and fat

What is a highly reactive substance that damages human tissue upon contact?

Corrosive material

Ohms law states that current is ___________ to voltage

Current is directly proportional to voltage

What is the assigned waste code for corrosive material

D002

What is electrical resistance?

Difficulty of passing a current through a conductor (measured in Ohms Ω)

What substance fire extinguisher is best used for class D fires?

Dry powder

What is a class C fire

Energized electrical equipment

What does it mean when a pH is neutral? What ions in particular?

Equilibrium of hydrogen and hydroxyl ions

A rapid self sustaining chemical reaction with oxygen, heat, and fuel?

Fire

The difference between flammable gas and flammable liquid is ______________ are ready to burn ______________ must be vaporized to burn

Flammable gas is ready Flammable liquid must be vaporized

What is a class B fire?

Flammable liquid or gasses (paint included)

What pH value indicates a base?

Greater than > 7

Current (I) =

I = V / R V= voltage R= resistance

What conditions must be met for vapor to burn ?

If concentration in air is BETWEEN lower flammability limit and upper flammability limit

What is the dose of toxicity that kills 50% of a sample population called?

LD50

What is the formula for Le Chatelier's mixing rule?

LFLmix = 1 / Σ(fn/LFLn) LFLmix= lower flammability limit of mixture Fn= fractional concentration of component n LFLn = Lower flammability limit of component n

What do you use to calculate the flammable range of a mixture of gases?

Le Chatelier's Mixing Rule

What pH value indicates acid?

Less than < 7

What can be used to test a pH of a solution?

Litmus paper

The concentration of free hydrogen ions being greater than hydroxyl will be a high or low pH value?

Low pH value.

What does the Toxic Equivalency Factor compare all toxins to?

Most toxic dioxin

The limit on the amount of exposure a worker can have to a hazardous substance or agent is called what?

Permissible exposure limit (PEL)

Corrosive material is considered for what in particular?

Strong acid/ strong base

How does the EPA define corrosive waste?

Substance that eroded steel at a rate of 1/4 inch per year or greater or has a pH less than 2 or greater than 12.5

How does a Litmus paper show results?

Substances with low pH will turn the blue paper red Substances with a high pH will turn red litmus paper blue

What formula is used to calculate the toxic equivalency of a compound?

TEQ= Σ(Mi x TEFi) ___% of substance x a TEF of ____

What does the pH scale measure?

The acidity or alkalinity (basicity) of a solution

What is electric voltage?

The difference in electrical potential energy between 2 points per unit electric charge. Measured in Volts (V)

The PEL is usually given as a _______ over an ___ hour period

Time weighted average over an 8 hour period

If the concentration is lower than the LFL, what is the mixture of gas and atmosphere considered?

Too lean

If concentration is higher than the UFL, what is the gas and atmosphere considered?

Too rich

Resistance (R) =

V / I V = voltage I = current

Voltage =

V = I x R I = current R = resistance

What are the 3 primary parameters of electricity

Voltage, current, and resistance

What substance fire extinguishers are good for class A fires?

Water & foam

What substance is best used for class K fires?

Wet chemical

How to find the concentration of a solution

[H+] = 10^pH [OH-] = 10^pOH Answer is #.## x 10^# M

How to calculate pH of a solution (formula)

pH = -log[H+] H= concentration of hydrogen ions pOH= -log[OH-] OH= concentration of hydroxide ions pH+pOH= 14 ALWAYS

What does the pH scale range from?

0-14


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