UCI CHEM 1LD PRACTICAL EXAM QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026

UCI CHEM 1LD PRACTICAL EXAM QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026 What factors determines whether a solute will dissolve in a solvent? - Answers imf's, molecular dipoles, molecular geometry, electrostatic attraction What is the strongest imf that must be overcome when melting menthol? - Answers hydrogen bonding A solution is created when a small amount of solute dissolves in a large amount of _________ - Answers solvent What is concentration of a solvent reported as? - Answers molality A solutions concentration is reported as _______ per ________ - Answers solute per kilogram What should you do to respond to an emergency? - Answers know where the stairwells are, all laboratories must have two exits, stay calm, turn off lab equipment before leaving lab for a fire alarm True or false: cinnamic acid dissolves in melted menthol - Answers true True or false: cinnamic acid does not stay dissolved in solid menthol - Answers true How will a weak acidity affect the freezing point depression? - Answers The solution freezing point is lower than it should be Why is the solution freezing point lower due to a weak acidity? - Answers particles in the solution are greater due to dissociation name common household products that contain flammable chemicals - Answers rubbing alcohol, gasoline, antifreeze, nail polish remover ways to stop a fire - Answers place beaker over an open flame, ground metal container to prevent static electricity, remove ignition sources, limit quantities of flammable substances in work area what is true about flammability? - Answers 1. inflammable is another word for flammable 2. a fire cannot start above or below a vapor's flammability limits what number means that a chemical is extremely flammable? - Answers 4 The National Fire Protection Association (NFPA) diamond has a _________ section for flammability - Answers red 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 HC 1 If the hazard category is __________ , the chemical is a combustible. - Answers HC 4 best piece of glassware for TLC eluent ratios is __________ - Answers graduated cylinder What is true about fume hoods - Answers 1. room air should be drawn into the fume hood 2. The window on the front of the fume hood is called a sash. 3. All work should be done at least 6 inches inside the hood. 4. A tissue paper held at the bottom of a sash should blow into the hood. PEL - Answers permissible exposure limit odor threshold - Answers gas concentration that 50% of the population can detect odor fatigue - Answers decreased sensitivity to odors after prolonged exposure IDLH - Answers Immediately Dangerous to Life and Health OEL - Answers Occupational Exposure Limit what is the major underlying principle of chromatography? - Answers separation will be achieved if one component adheres to the stationary phase more than the other component does what is a stationary phase? - Answers Where the molecules can't move. It is a solid or a really thick liquid what is a mobile phase - Answers Where the molecules can move. This is always a liquid or a gas Why does most of the TLC plate turn pink? - Answers unreacted permanganate is pink Why does TLC spots turn yellow? - Answers the compound has double bonds What is true about gloves? - Answers 1. gloves should not be removed when they come in contact with hazardous chemicals 2. no glove material protects against all chemicals permeation - Answers the movement of a chemical through a surface or, on a molecular level, through intact materials; penetration, or spreading. degradation - Answers the process by which a chemical substance is broken down to smaller molecules by biotic means breakthrough time - Answers Time required for a chemical to permeate the material of a protective suit. rate of transfer - Answers speed at which chemical seeps through True or false: nitrile gloves protect well against an aliphatic hydrocarbons like heptane and limonene - Answers true true or false: nitrile gloves can be degraded by acetone (a ketone) - Answers true What of the following guidelines should be followed to protect your skin in the chemical laboratory? - Answers 1. wear a lab coat 2. wear clothing that covers most of your body 3. wear sturdy closed toed and heel shoes 4. use gloves when appropriate to do so. toxicology - Answers the study of the adverse effects of chemicals or physical agents on living organisms toxicity - Answers the ability of a chemical to cause harm to an organism toxicant - Answers A chemical with adverse human health effects toxin - Answers toxic substance made by living organisms acute toxicity - Answers the ability of a chemical to cause harm to an organism with only one exposure