CHEM 1LD EXAM QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026

CHEM 1LD EXAM QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026 The most probably lab emergencies are chemical spills, etc. Which of the following statements are TRUE about responding to emergencies? A. Stay calm B. All labs must have 2 exits C. Know where the stairwells are D. If possible turn off lab equipment before leaving lab for fire alarm. - Answers All of the above Which of the following common household products contain flammable chemicals? A. Gasoline B. Antifreeze C. Bleach D. Rubbing alcohol E. Nail polish remover F. Liquid hand soap - Answers A, b, d, e Which of the following are ways to stop a fire? A. Remove ignition sources B. Limit quantities of flammable substances in work area. C. Place beaker over a small flame to remove oxygen D. Ground metal container to prevent static electricity - Answers All of the above Which of the following statements are true about flammability? A. A fire can't start above or below a vapor's flammability limits. B. Inflammable is another word for flammable. C. The boiling point of a flammable liquid is usually high d. Flammable chemicals can be liquids or solids, gases don't burn E. All volatile chemical are flammable F. Combustible are the same as flammable - Answers A, B The National fire protection association (NFPA) diamond has a BLANK section for flammability. If the number BLANK appears in this section, the chemical is extremely flammable. If the number BLANK appears in this section, the chemical is a combustible, it will catch on fire when heated. - Answers Red, 4, 2 The Global Harmonized system (GHS) symbol is a pic of a BLANK. If the hazard category is BLANK, the chemical is extremely flammable. If the hazard category is BLANK, the chemical is a combustible. - Answers Fire, HC 1, HC 4 Which of the following is true about fume hoods? A. Room air should be drawn into fume hood. B. The window on front of fume hood is called a stash. C. All work should be done at least 6 inches inside the hood. D. A tissue paper held at the bottom of a sash should blow into the hood. E. A fume hood has it's own power. It's okay to continue work if the power fails. F. Exhaust air from fume hoods is recycled back through lab. - Answers A, b, c, d, PEL - Answers Permissible Exposure Limit Odor Threshold - Answers Gas concentration that 50 odor fatigue - Answers Decreased sensitivity to odor after some exposure time IDLH - Answers Immediately Dangerous to Life and Health OEL - Answers Occupational Exposure Limit Which of these chemicals will you smell AFTER it becomes hazardous? A. Hexane: 50ppm (PEL), 130ppm (odor threshold) B. Dicholoromethane: 25ppm (PEL), 130ppm (odor threshold) C. Ethyl acetate: 400ppm (PEL), 50ppm (Odor threshold) D. Methanol: 200ppm (PEL); 5900ppm (odor threshold) - Answers A, b, d *0.25/0.5 Which statement about gloves is true? A. Gloves should be removed when they come into contact with any hazardous chemical. b. Latex gloves are the best choice for most people working in labs. C. Only non-disposable gloves protect against most chemicals. D. Most gloves protect against most chemicals. E. No glove material protects against all chemicals. - Answers A, e, permeation - Answers Ability of a chemical (to seep through glove) degredation - Answers Destructive change in the glove material Breakthrough time - Answers Time for first apperance (to when it touches the skin thorough glove) Rate of transfer - Answers Speed at which a chemical seeps through Which of the following are TRUE about lab coats? A. Lab coats should never be worn outside of lab. B. Lab coats don't need to be removed if chemicals are spilled on them. C. Sleeves should never be rolled up. D. Coats should be work open, snapping or buttoning of coats... - Answers A, c Nitrile gloves are used in general and organic chemistry labs. Which of the following are TRUE? A. Nitrile gloves protect well against aldehydes. B. Nitrile gloves are made of natural rubber. C. Nitrile gloves protect well against an aliphatic hydrocarbons like heptane and limonene. D. Nitrile gloves can be degraded by acetone (a ketone) - Answers C, d Which of the following guideline should be followed to protect your skin in the chem lab? A. Use gloves when appropriate to do so. B. Wear clothing that covers most of your body C. Wear sturdy close toed and heel shoes. D. Wear a lab coat. - Answers All of the above Toxicology - Answers the study of the adverse effects of chemicals or physical agents on living organisms Toxicity - Answers Ability of chemical to damage/cause harm Toxicant - Answers Chemical producing toxins effects