lab test 1
A burning lab notebook is what class of fire? a) A b) B c) C d) D
a) A
Eating, drinking, and smoking in a lab a) Are not allowed in labs b) Are allowed whenever the lab instructor says it is OK to do so c) Are allowed in labs whenever there are no open beakers of chemicals in use d) Are allowed in labs as long as there is no reasonable chance of ingesting lab chemicals
a) Are not allowed in labs
What term describes a chemical that causes cancer in humans or animals? a) Carcinogen b) Embryotoxin c) Lacrimator d) Teratogen
a) Carcinogen
Facilities, location, equipment, procedures, and standards are examples of a) Environmental factors b) Person factors c) Behavior factors d) None of the above
a) Environmental factors
If a fire starts near you in the lab, you should a) Extinguish the fire with a fire extinguisher if you are trained to do so and can do this safely b) Immediately leave the lab and building c) Tell your instructor only if the fire seems like it may become larger d) Ask another student what to do
a) Extinguish the fire with a fire extinguisher if you are trained to do so and can do this safely
What phase(s) of matter do not burn? I. Solid II. Liquid III. Gas a) I and II b) I and III c) Only I d) II and III
a) I and II
If there is an accident (incident) or chemical spill in the lab, you should a) Notify your instructor immediately b) Notify your instructor only if emergency equipment had to be used c) Alert other nearby students, but tell the instructor only if the event is serious d) Notify your instructor before the end of the lab period
a) Notify your instructor immediately
Water is a useful extinguishing agent on what class(es) of fire? a) Only A b) A and B c) A and C d) Only D
a) Only A
What terms are the signal words found on a GHS label? I Warning II Caution III Toxic IV Danger a) Only I and IV b) Only II and IV c) Only I, II and III d) I, II, III, and IV
a) Only I and IV
Many accidents in labs are caused by a) Poor housekeeping b) Selecting chemicals incorrectly c) Running reactions at temperatures that are too high d) Using personal protective equipment inappropriately
a) Poor housekeeping
The best way to learn how to use a fire extinguisher is to a) Use one during a real fire emergency b) Read the label on the extinguisher c) Practice using a fire extinguisher during a training course d) Practice using a fire extinguisher anytime you are not busy during a lab experiment
a) Use one during a real fire emergency
The best way to avoid inhalation of volatile chemicals while working with them is to a) Work in a chemical hood when using them b) Avoid breathing the vapors by holding beakers and flasks at armís length c) Wear a common dust mask d) Always keep beakers, flasks, and bottles of the chemical capped or covered
a) Work in a chemical hood when using them
which definition is incorrect? a) A hazard is an unknown source of danger or harm. b) Risk is the probability of suffering harm from being exposed to a hazard or unsafe situation. c) Exposure means coming in direct contact with a hazard or chemical in a fashion that can cause injury or harm. d) Safety is freedom from danger, injury, or damage.
a) a hazard is an unknown source of danger or harm
Which statement is true? a) Chemicals that we encounter in labs and elsewhere are hazardous. b) Only chemicals that are toxic are considered hazardous. c) The more useful a chemical is in a lab, the more hazardous it is. d) Only liquid and gaseous chemicals are hazardous.
a) chemicals that we encounter in labs and elsewhere are hazardous
Atmospheric lab pressure should be a) negative relative to atmospheric hallway pressure b) the same as atmospheric hallway pressure c) positive relative to atmospheric hallway pressure d) either positive or negative, but not the same as atmospheric hallway pressure
a) negative relative to atmospheric hallway pressure
What term describes a chemical that is stored at extremely low temperatures? a) Pyrophoric b) Cryogen c) Lacrimator d) Compressed gas
b) Cryogen
Most adverse occupational exposures to chemical are through a) Inhalation b) Dermal exposure c) Ingestion d) The eyes
b) Dermal exposure
The hazard ratings in the NFPA diamond a) Describe how a chemical behaves in a fire, which is almost identical to how it behaves under lab conditions b) Describe how a chemical behaves in a fire, which is not always the same as how it behaves under lab conditions c) Was designed for firefighters and is of almost no practical use for chemists d) Refer to categories of chemicals, not individual chemicals
b) Describe how a chemical behaves in a fire, which is not always the same as how it behaves under lab conditions
Class C fires involve a) Ordinary flammables b) Energized electricity c) Flammable liquids d) Reactive metals
b) Energized electricity
BC fire extinguishers work by I. preventing O2 from contacting the burning fuel II. cooling the fire below the ignition temperature III. preventing a flammable liquid from vaporizing a) I or II b) I or III c) II or III d) I and II
b) I or III
Tasting chemicals a) Is allowed for solutions that are very dilute. b) Is never allowed in chemistry labs c) Is allowed for lab chemicals that we also know are common chemicals (such as vitamin C) d) Is allowed for chemicals that are known to be nontoxic
b) Is never allowed in chemistry labs
Assessing risks in labs can be challenging because a) Only experts can really assess risk accurately b) It requires the anticipation of what kinds of exposures are possible for a given procedure c) Chemical reactions are generally not very reproducible and therefore unpredictable d) Predicting the hazards of chemicals is almost impossible
b) It requires the anticipation of what kinds of exposures are possible for a given procedure
When leaving a lab during an emergency, you should a) Always leave through the same door that you entered b) Leave through the nearest exit c) Follow the crowd d) Leave the lab only after given permission to do so by your instructor
b) Leave through the nearest exit
Attitude, beliefs, personality, knowledge, skills, and abilities, are examples of a) Environmental factors b) Person factors c) Behavior factors d) none of the above
b) Person factors
in Ramp, the P stands for a) Prevent risks b) Prepare for emergencies c) Plan for incidents d) Protect people from hazards
b) Prepare for emergencies
If, during an emergency, you cannot find your lab partner outside, you should a) Reenter the building to search for your lab partner b) Tell an emergency responder that you believe someone may still be in the building c) Call 911 d) Reenter the building to search for your lab partner if you think that there really isn't an emergency
b) Tell an emergency responder that you believe someone may still be in the building
Why is a carbon dioxide extinguisher not always effective against a Class A fire? a) The CO2 will further feed the Class A fire. b) The fire might momentarily be extinguished but the hot fuel can reignite when air hits the fire. c) Carbon dioxide cannot cool the flames enough. d) They typically last only 10ñ15 seconds, which is not long enough to extinguish the fire.
b) The fire might momentarily be extinguished but the hot fuel can reignite when air hits the fire.
During an emergency you should help an injured person only if a) The injuries are serious b) You can do so without putting yourself at risk c) You have specific training to help the person d) You are certain that you know how they were injured
b) You can do so without putting yourself at risk
When pulling a fire alarm a) You can safely assume that this also notifies the fire department b) You should also call 911 after exiting the building c) You should stay near the pull station so that you can turn off the alarm when the fire is out d) You can safely assume that this will notify campus security
b) You should also call 911 after exiting the building
The ACH value for a lab is a) a constant based on the volume of the room b) dependent upon the position of the chemical hood sashes c) unimportant with regard to heating and cooling costs d) designed to optimize heating and cooling costs
b) dependent upon the position of the chemical hood sashes
Portable fire extinguishers typically discharge for about a) 5-10 seconds b) 10-30 seconds c) 30 seconds to a few minutes d) 5-10 minutes
c) 30 seconds to a few minutes
Fire alarms should be pulled a) Only if you are absolutely sure that there is a fire b) Only if you think that there is a fire c) Any time that it is prudent to evacuate a building, whether there is a fire or not d) Only if your instructor tells you to do so
c) Any time that it is prudent to evacuate a building, whether there is a fire or not
Volatile chemicals are substances that a) Are very reactive b) Have a vapor pressure of at least 100 mm Hg c) Are liquids that vaporize readily at normal pressure and temperature d) Are gases at normal pressure and temperature
c) Are liquids that vaporize readily at normal pressure and temperature
In Ramp, the A stands for a) Avoid hazards b) Assign risk assessment tasks c) Assess risks d) Accident prevention
c) Assess Risks
If some organic solvent has spilled onto an operating hot plate and caught fire, what class of fire is this? a) B only b) C only c) B and C d) A and C
c) B and C
Safe and risky practices are examples of a) Environmental factors b) Person factors c) Behavior factors d) None of the above
c) Behavior factors
A burning computer that is being used is what class of fire? a) A b) B c) C d) D
c) C
When using a fire extinguisher it is best to a) Use it only in short bursts until the fire is out b) Use it continuously until the fire is out c) Discharge the entire extinguisher to optimize the use of extinguishing agent d) Discharge it until it starts to make too much of a mess in the lab
c) Discharge the entire extinguisher to optimize the use of extinguishing agent
Why is the most handy fire extinguisher in a chemistry lab almost always the appropriate fire extinguisher? a) It is the cheapest to use, and therefore easily replaced. b) It is probably an ABCD extinguisher that works on all classes of fires. c) Fire code requires that available fire extinguishers be the appropriate type for the most likely type of fire. d) It is the type of extinguisher that most folks know how to use.
c) Fire code requires that available fire extinguishers be the appropriate type for the most likely type of fire.
Most chemicals a) Are not very hazardous b) Have only one hazardous property c) Have multiple hazards, but not all of them are always listed on the label d) Have multiple hazards, with all of them listed on the label
c) Have multiple hazards, but not all of them are always listed on the label
In the event of a terrorist attack in a science building, you should a) Leave the building immediately, but not pull the fire alarm b) Leave the building immediately, and pull the fire alarm c) Hide in a safe location or follow the instructions of emergency personnel d) Make sure all lab experiments are shut down before taking any other action
c) Hide in a safe location or follow the instructions of emergency personnel
Most fire prevention methods involve the elimination of what part of the fire tetrahedron? a) Fuel b) Oxidizing agent c) Ignition source d) Chain reaction
c) Ignition source
What term describes a chemical that causes tears upon exposure? a) Pyrophoric b) Embryotoxin c) Lacrimator d) Mutagen
c) Lacrimator
If you hear a fire alarm, you should a) Finish the particular procedure that you are involved with before leaving the lab b) Ask your instructor if it is safe to leave the lab c) Leave the lab immediately, taking a moment to shut off electrical equipment and gas burners, if it is safe to do so d) Make sure that you see something on fire before over-reacting to the situation
c) Leave the lab immediately, taking a moment to shut off electrical equipment and gas burners, if it is safe to do so
Why are pressurized water extinguishers not found in chemistry laboratories? a) They are too expensive. b) They are too heavy for some people to operate. c) Most lab fires are Class B or Class C fires. d) Most lab fires are Class D fires.
c) Most lab fires are Class B or Class C fires.
What information is not part of a GHS label? a) Pictogram b) Signal word c) NFPA fire diamond d) Hazard statement
c) NFPA fire diamond
What is the most effective method for avoiding exposure by ingestion? a) Taste only chemicals that your instructor gives you permission to taste. b) Taste only chemicals that you know are nontoxic. c) Never eat or drink anything while in a chemistry lab. d) Only eat food in a lab when you know that it cannot be contaminated with a toxic chemical.
c) Never eat or drink anything while in a chemistry lab.
A student should attempt to use a fire extinguisher a) Only if an instructor says it is OK b) Always, before sounding an alarm or alerting anyone else c) Only if the fire is small enough and the student can confidently use the available extinguisher d) On all fires, no matter how small or large because the fire will certainly get larger and cause considerable damage
c) Only if the fire is small enough and the student can confidently use the available extinguisher
In introductory chemistry labs, most emergencies involving fires or spills are not likely to be major events since a) Most of the chemicals are not flammable b) Most of the chemicals are relatively safe to use c) Only small quantities of chemicals are used d) Lab instructors can be relied upon to quickly respond to any emergencies
c) Only small quantities of chemicals are used
Class A fires involve a) Energized electricity b) Flammable liquids c) Ordinary flammables d) Reactive metals
c) Ordinary flammables
What is the correct sequence of actions in order to use any fire extinguisher properly? a) Aim, pull, sweep, and squeeze b) Aim, pull, squeeze, and sweep c) Pull, aim, squeeze, and sweep d) Pull, aim, sweep, and squeeze
c) Pull, aim, squeeze, and sweep
Most accidents in labs occur when a) Experienced lab workers try a new experiment b) Inexperienced lab workers use chemicals c) Safety rules and safe practices are not followed d) Accidents happen beyond the control of the lab worker
c) Safety rules and safe practices are not followed
Which statement is true with regard to the NFPA diamond? a) The blue diamond at the 9 o'clock position refers to special hazards. b) The white diamond at the 6 o'clock position refers to instability hazard. c) The red diamond at the 12 o'clock position refers to flammability. d) The yellow diamond at the 3 o'clock position refers to health hazard.
c) The red diamond at the 12 o'clock position refers to flammability.
Learning to be safe in chemistry laboratories is best accomplished by: a) Performing experiments to see what's safe and what isn't b) Memorizing the 14 safety rules c) Thinking about the hazards and risks associated with experiments d) Learning from one's own mistakes
c) Thinking about the hazards and risks associated with experiments
The best extinguishing agent for a person on fire is a) Type BC b) Type ABC c) Water d) Type ABCD
c) Water
It is generally true that a) Almost all chemicals have an odor threshold below their toxic threshold b) Almost all chemicals have an odor threshold above their toxic threshold c) Whenever you can smell a chemical you are being exposed to it d) None of the above
c) Whenever you can smell a chemical you are being exposed to
What factor does not play a significant role in the extent of harm upon exposure to a chemical? a) Dose b) Length of exposure c) Whether it is natural or synthetic d) Path of exposure
c) Whether it is natural or synthetic
How many hazard classes are in the GHS? a) 3 b) 15 c) 23 d) 28
d) 28
Which definition is not correct? a) Mists are tiny droplets of liquid suspended in the air. b) Fumes are small solid particles that are formed when a solid is vaporized. c) Dusts are solid particles suspended in air. d) A heterogeneous mixture in air is one where the contaminant is a colloid.
d) A heterogeneous mixture in air is one where the contaminant is a colloid.
Having a chemical injected through your skin a) Is uncommon in labs because chemists use needles and syringes only rarely b) Is possible if there is an explosion that produces sharp glass that is contaminated c) Is not likely to produce a toxic dose unless pathogens are involved d) All of the above
d) All of the above
Smoke a) Is a mixture of aerosol particles resulting from the incomplete combustion of carbon-based materials b) Contains many toxic, small-molecule compounds c) Is a colloid d) All of the above
d) All of the above
The best way(s) to avoid chemical contact with the skin is to wear a) Clothes that protect most of your body b) A lab coat c) Shoes that cover your feet d) All of the above
d) All of the above
Why do some lab workers take unnecessary risks? a) They willfully violate rules that they know about. b) They are unaware of the risks. c) They repeat experiments with high risk that have not failed before. d) All of the above.
d) All of the above.
In order to avoid exposure to your eyes in a chemistry lab you should wear eye protection a) Only when working with corrosive chemicals b) Only when your instructor requires it c) Only when there are other students working nearby who might do something stupid d) All of the time
d) All of the time
For every chemical there is a unique a) Chemical formula b) Molar mass c) Safety warning d) CAS number
d) CAS number
What part of the fire tetrahedron was not originally included in the fire triangle? a) Fuel b) Oxidizing agent c) Ignition source d) Chain reaction
d) Chain reaction
A fire involving sodium hydride is what class of fire? a) A b) B c) C d) D
d) D
You can reenter a building after an emergency when a) You no longer believe that any emergency exists b) The fire alarm is silenced c) You see other people reentering the building d) Emergency personnel allow you to do so
d) Emergency personnel allow you to do so
Class B fires involve a) Ordinary flammables b) Reactive metals c) Energized electricity d) Flammable liquids
d) Flammable liquids
ABC fire extinguishers work by a) Cooling the fire b) Chemically neutralizing the fuel c) Preventing vaporization of a flammable liquid d) Forming a sticky layer that prevents oxygen (in the air) from reacting with the fuel
d) Forming a sticky layer that prevents oxygen (in the air) from reacting with the fuel
Safety incidents can generally occur in a) Introductory labs b) Advanced labs c) Research labs d) Labs at all levels of the curriculum
d) Labs at all levels of the curriculum
Gloves worn in labs a) Are generally resistant to almost all chemicals b) Usually protect against only a limited number of chemicals c) Generally protect against most chemicals, but only for a short period of time d) Need to be selected carefully to protect against the particular chemicals you are using
d) Need to be selected carefully to protect against the particular chemicals you are using
What rating systems are used in the GHS hazard classes? I Numbers (1, 2, 3, 4) II Letters (A, B, C, D) III Numbers with letters (1As, 1B, 1C) IV Roman numerals (I, II, III) a) Only I and II b) Only III c) Only IV d) Only I, II, and III
d) Only I, II, and III
Class D fires involve a) Ordinary flammables b) Flammable liquids c) Energized electricity d) Reactive metals
d) Reactive metals
Why is it sometimes hard to recognize the hazards of chemicals? a) For the most part, we do not know what the hazards can be. b) The terms used to describe hazards are not well defined. c) While hazards are generally known, it is not easy to access them in print or on the Web. d) Recognizing hazards requires an understanding or the language of safety and knowing where to access safety information.
d) Recognizing hazards requires an understanding or the language of safety and knowing where to access safety information.
Which term is not found associated with a GHS pictogram? a) Oxidizer b) Corrosive c) Explosive d) Reducing agent
d) Reducing agent
Which is not a component of the student safety ethic? a) Work safely. b) Avoid unnecessary risk. c) Accept responsibility for safety. d) Rely on your teacher to keep you safe.
d) Rely on your teacher to keep you safe.
What document may contain useful information about the hazards of a chemical? a) Chemical Hygiene Plan b) Chemical Risk Document c) Course syllabus d) Safety Data Sheet
d) Safety Data Sheet
What term describes a chemical that causes physical defects in a developing fetus or embryo? a) Carcinogen b) Pyrophoric c) Lacrimator d) Teratogen
d) Teratogen
Keeping caps on bottles of chemicals in the lab will a) minimize vaporization or sublimation of the chemical b) prevent atmospheric moisture from possible reacting with the chemical c) help prevent a spill if the bottle is knocked over d) all of the above
d) all of the above
in Ramp, the M stands for a) Maintain equipment in working order b) Materials list c) Monitor hazards d) Minimize risks
d) minimize risks
In Ramp, the R stands for a) Risk as little as possible b) Repair broken glassware c) Report all incidents d) Recognize hazards
d) recognize hazards