CHEM 1LD SAFETY QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026

CHEM 1LD SAFETY QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026 What should you do during laboratory emergencies: chemical spills, minor burns and cuts, and fires? - Answers - Stay calm - turn off lab equipment before leaving lab for fire alarm - know where stairs are - all labs must have 2 exits Which of the following common household products contain flammable chemicals? - Answers - gasoline - nail polish remover - antifreeze - rubbing alcohol Ways to stop a fire? - Answers - limit quantities of flammable substances in work area - remove ignition sources - place beaker over small flame to remove oxygen - ground metal container to prevent static electricity True about flammability - Answers - a fire cannot state above/below a vapor's flammability limits - inflammable is another work for flammable The National Fire Protection Association (NFPA) diamond has a ___ section for flammability. - Answers red If the number ___ appears in this section, the chemical is extremely flammable - Answers 4 If the number ___ appears in this section, the chemical is a combustible. It will catch fire when heated. - Answers 2 The Global Harmonized System (GHS) symbol is a picture of a ___. - Answers fire If the hazard category is ___, the chemical is extremely flammable - Answers Hazard Category 1 If the hazard category is ___, the chemical is a combustible. - Answers Hazard Category 4 True statements about fume hoods - Answers - room air should be drawn into the fume hood - the "sash" is the window on the front of the fume hood - all work should be done at least 6 inches inside the hood - tissue paper held at bottom of sash should blow into the hood PEL - Answers Permissible Exposure Limit Odor Threshold - Answers Gas concentration Odor fatigue - Answers decreased sensitivity IDLH - Answers Immediately Dangerous to Life and Health OEL - Answers Occupational Exposure Limit Which of these chemicals will you smell AFTER it becomes hazardous? - Answers The chemical with its PEL (permissible exposure limit) is LOWER than its odor threshold True glove statements - Answers - gloves should be removed when they come in contact with any hazardous chemical - no glove material protects against all chemicals Permation - Answers ability of chemical to see through the glove Degradation - Answers Destructive change Breakthrough time - Answers time for first appearance (to when it touches skin through glove) Rate of transfer - Answers speed at which chemical seeps through True statements about lab coats - Answers -sleeves should never be rolled up - lab coats should never be worn outside of lab True statements about nitrile gloves - Answers - nitrile gloves protect well against aliphatic hydrocarbons (heptane and limonene) - can be degraded by ketones (acetone) Which of the following guidelines should be followed to protect your skin in the chemistry laboratory? - Answers - use gloves - wear clothing that covers most of body - wear lab coat - wear closed toe shoes - PPEs Hazard - Answers potential source of danger Risk - Answers probability of suffering (harm) Risk Level - Answers hazard severity x exposure Risk Assessment - Answers identification of source (of harm) Risk Management - Answers wearing PPEs Factors that affect probability of exposure to hazard - Answers - personal knowledge of hazards - containment of chemicals (capping reagents, using chemicals in the fume hood) - type of PPEs (goggles, gloves, lab coats, etc) - amount of chemical used - routes of exposure (skin, eyes, inhalation, ingestion) While pouring 1 M of an aqueous potassium permanganate solution from a 1L reagent bottle, a student's hand slipped and the bottle fell and broke open. A small amount of solution splashed onto the student's eyes. The solution also spilled across the bench top and dripped down to create a pool on the floor. If no safety precautions are followed the severity of the hazard is ___ and the probability of the event happening is ___. This leads to a risk level that is ___. Which measure should be taken to manage the risk? ___ - Answers - Hazard is MODERATE - Probability of event happening is POSSIBLE - Risk level is MEDIUM - ALL actions/measures should be taken Toxicology - Answers study of adverse effects Toxcity - Answers ability of chemical to cause harm Toxicant - Answers chemical producing toxic (effects) Acute Toxicity - Answers Toxic substance made from plants or animals Chronic Toxicity - Answers ability to kill with one dose