CHM151 LAB EXAM 1 QUESTIONS AND VERIFIED
ANSWERS
Qualitative - Answers - noting observations such as color, color changes, hardness,
whether heat is liberated or absorbed, and odor.
Quantitative - Answers - noting the amount of a measurable change in mass, volume, or
temperature, for example, fro which the qualitative data are already known.
Four objectives in the laboratory - Answers - 1. To develop the skills necessary to obtain
and evaluate a reliable original result.
2. To record your results for future use.
3. To be able to draw conclusions regarding you results (with the aid of some coaching
and reading in the beginning.)
4. To learn to communicate your results critically and knowledgeably.
Safety Rule 1 - Answers - Wear approved eye protection (including splash guards) at all
times while in the laboratory.
-must include shatterproof lenses and side shields.
-use fountain before the material runs behind your eyeglasses and into your eyes.
There is a "panic bar" for easy activation.
Safety rule 2 - Answers - Wear shoes at all times
Safety rule 3 - Answers - Eating, drinking, and smoking are strictly prohibited in the
laboratory at all times.
Safety rule 4 - Answers - Know where to find and how to use all safety and first-aid
equipment.
Safety Rule 5 - Answers - Consider all chemicals to be hazardous unless you are
instructed otherwise. Dispose of chemicals as directed by your instructor.
Safety rule 6 - Answers - If chemicals come into contact with your skin or eyes, wash
immediately with copious amounts of water and then consult your laboratory instructor
Safety rule 7 - Answers - Never taste anything. Never directly smell the source of any
vapor or gas.
Safety rule 8 - Answers - Perform in the fume exhaust hood any reactions involving
skin-irritating or dangerous chemicals, or unpleasant odors.
, Exhaust hoods - Answers - -have fans to exhaust fumes out of the hood and away from
the user.
-used when studying noxious, hazardous and flammable materials.
-shatterproof glass window used as a shield to protect you from minor explosions
-toxic fumes are stored in the hood.
safety rule 9 - Answers - never point a test tube that you are heating at yourself or your
neighbor. It may erupt like a geyser.
safety rule 10 - Answers - Do not perform any unauthorized experiments.
safety rule 11 - Answers - clean up all broken glassware immediately
safety rule 12 - Answers - always pour acids into water, not water into acid, becuase the
heat of solution will cause the water to boil and the acid to spatter. "Do as you oughter,
pour acid into water"
safety rule 13 - Answers - avoid rubbing your eyes unless you know that your hands are
clean.
safety rule 14 - Answers - when inserting glass tubing or thermometers into stoppers.
lubricate the tubing and the hole in the stopper with glycerol or water.
-wrap the rod in a towel
-grasp it as close to the end being inserted as possible.
-slide the glass into the rubber stopper with a twisting motion.
-remove the excess lubricant
-keep you hands as close together to reduce leverage.
safety rule 15 - Answers - always place the ring stand as far back on the laboratory
bench as comfortable, with long edges or the base perpendicular to the front of the
bench.
safety rule 16 - Answers - notify the instructor immediately in case of an accident.
safety rule 17 - Answers - many common reagants- alcohol, acetone- are highly
flammable. So not use them anywhere near open flames.
safety rule 18 - Answers - observe all special precautions mentioned in experiments.
safety rule 19 - Answers - learn the location and operation of fire protection devices
carbon dioxide fire exinguishers - Answers - -available in lab
-pull the metal safety ring from the handle and depress the handle.
-Direct at the base of the flames.
-turn in at stockroom to be refilled
-evacuate laboratory if it does not work.
ANSWERS
Qualitative - Answers - noting observations such as color, color changes, hardness,
whether heat is liberated or absorbed, and odor.
Quantitative - Answers - noting the amount of a measurable change in mass, volume, or
temperature, for example, fro which the qualitative data are already known.
Four objectives in the laboratory - Answers - 1. To develop the skills necessary to obtain
and evaluate a reliable original result.
2. To record your results for future use.
3. To be able to draw conclusions regarding you results (with the aid of some coaching
and reading in the beginning.)
4. To learn to communicate your results critically and knowledgeably.
Safety Rule 1 - Answers - Wear approved eye protection (including splash guards) at all
times while in the laboratory.
-must include shatterproof lenses and side shields.
-use fountain before the material runs behind your eyeglasses and into your eyes.
There is a "panic bar" for easy activation.
Safety rule 2 - Answers - Wear shoes at all times
Safety rule 3 - Answers - Eating, drinking, and smoking are strictly prohibited in the
laboratory at all times.
Safety rule 4 - Answers - Know where to find and how to use all safety and first-aid
equipment.
Safety Rule 5 - Answers - Consider all chemicals to be hazardous unless you are
instructed otherwise. Dispose of chemicals as directed by your instructor.
Safety rule 6 - Answers - If chemicals come into contact with your skin or eyes, wash
immediately with copious amounts of water and then consult your laboratory instructor
Safety rule 7 - Answers - Never taste anything. Never directly smell the source of any
vapor or gas.
Safety rule 8 - Answers - Perform in the fume exhaust hood any reactions involving
skin-irritating or dangerous chemicals, or unpleasant odors.
, Exhaust hoods - Answers - -have fans to exhaust fumes out of the hood and away from
the user.
-used when studying noxious, hazardous and flammable materials.
-shatterproof glass window used as a shield to protect you from minor explosions
-toxic fumes are stored in the hood.
safety rule 9 - Answers - never point a test tube that you are heating at yourself or your
neighbor. It may erupt like a geyser.
safety rule 10 - Answers - Do not perform any unauthorized experiments.
safety rule 11 - Answers - clean up all broken glassware immediately
safety rule 12 - Answers - always pour acids into water, not water into acid, becuase the
heat of solution will cause the water to boil and the acid to spatter. "Do as you oughter,
pour acid into water"
safety rule 13 - Answers - avoid rubbing your eyes unless you know that your hands are
clean.
safety rule 14 - Answers - when inserting glass tubing or thermometers into stoppers.
lubricate the tubing and the hole in the stopper with glycerol or water.
-wrap the rod in a towel
-grasp it as close to the end being inserted as possible.
-slide the glass into the rubber stopper with a twisting motion.
-remove the excess lubricant
-keep you hands as close together to reduce leverage.
safety rule 15 - Answers - always place the ring stand as far back on the laboratory
bench as comfortable, with long edges or the base perpendicular to the front of the
bench.
safety rule 16 - Answers - notify the instructor immediately in case of an accident.
safety rule 17 - Answers - many common reagants- alcohol, acetone- are highly
flammable. So not use them anywhere near open flames.
safety rule 18 - Answers - observe all special precautions mentioned in experiments.
safety rule 19 - Answers - learn the location and operation of fire protection devices
carbon dioxide fire exinguishers - Answers - -available in lab
-pull the metal safety ring from the handle and depress the handle.
-Direct at the base of the flames.
-turn in at stockroom to be refilled
-evacuate laboratory if it does not work.
