Chem 102 Safety
(b) A buret should be read to which nearest mL?
0.01 mL
(c) Why should silver nitrate be handled carefully?
It will cause dark spots where it contacts the skin.
(c) Twisting the sleeve to open the holes (baffles) above the base of the burner does which of the following?
allows more air (oxygen) into the flame
These questions concern waste disposal in the Solubility Rules lab. Select the correct response from each pull-down menu.
(a) All of the solutions prepared in this experiment should be discarded in the waste container on the bench. (b) It is a good idea to have a labeled beaker in the work area to collect waste during the experiment.(c) A squeeze bottle of deionized water can be used to rinse the solutions into the beaker.(d) Use the minimum amount of water possible, to avoid creating a large volume of waste solution.
These questions concern safety issues in the Solubility Rules lab.
(a) Some of the cations are toxic. (b) They should not be ingested. (c) If they are spilled on the skin, the area should be washed well with soap and water.
(a) Choose the chemical in this experiment that has irritating vapors.
3 M HCl
(b) Select all of the following which might give off highly irritating vapors.
acetic acid (HC2H3O2) ammonia (NH3) hydrochloric acid (HCl)
There are several hazards associated with the chemicals in the Qualitative Analysis experiment. For each chemical, identify the associated hazards. (Select all that apply.)
6M HCL and 6M H2SO4 (corrosive, irritating vapors), 0.1 M Ag (causes staining on skin)
What should be done with waste materials in the Qualitative Analysis experiment? (Select all that apply.)
After the beaker is emptied, it should be rinsed with a little water, and the rinsings should be poured into the container, During the experiment, wastes should be kept in a labeled beaker at the bench, All wastes should be put in the container on the side shelf.
What should be done with the waste from the Acid-Base Studies experiment?
All solutions can be flushed down the sink with plenty of water.
(b) What should be done with metal waste from Part A2 (Ranking Reducing Agents) of the experiment?
Before disposal, the metal should be blotted on a paper towel to dry it.The metal should be placed in the container for waste metal.Before disposal, the metal should be rinsed with water if it has been in acid solution.
(c) What should you do when filling a buret?
Fill the buret and drain to exactly the zero mark, as this particular experiment involves volume entry into MicroLab.Condition the buret first.Make sure there are no air bubbles left in the buret tip. Make sure the stopcock is closed.
(b) If 12 M HCl is splashed onto the eyes or skin, what is the proper response?
Flush the affected area with a lot of water, Have your lab partner notify the instructor about the spill while you continue rinsing with water.
(d) If any of these (Phenolphthalein, vinegar, NaOH) get in your eyes, what is the proper response?
Flush the affected area with a lot of water, Have your lab partner notify the instructor about the spill while you continue rinsing with water.
(f) If one of these solutions contacts the skin or clothing, what is the first thing you should do?
Flush the affected area with a lot of water.
(d) Why should the container for the metals from Part A2 (Ranking Reducing Agents) not be tightly capped?
Hydrogen gas could build pressure in it.
When working with a Bunsen burner, which of the following precautions must be observed? (Select all that apply.)
If the flame blows out, the gas must be turned off, because gas could accumulate and an explosion could occur, The area near the burner should be clear of paper and other flammables, Flammable liquids should never be heated with a Bunsen burner, The area above the burner must be clear before it is lit, The burner must never be left unattended, The substance being heated should never be pointed at people.
(a) In the experiment on Le Châtelier's Principle, why must one be very careful when handling concentrated hydrochloric acid (12 M HCl)?
Its vapor is a respiratory irritant, so it should be used in a fume hood, It is highly corrosive, and can injure the eyes and skin.
(d) How should accidents be prevented when working with the reactions that produce hydrogen gas, which is flammable?
Keep reactions away from ignition sources, and rinse metal before discarding it.
When operating the centrifuge, students should do which of the following?
Make sure that the lid is completely shut and the safety knob is turned to engage the safety switch, Centrifuge for approximately 30 seconds.
When placing test tubes in the centrifuge, what are the best practices?
Place test tubes containing approximately equal volumes in opposite positions on the rotor, Never put stoppers or other items in the centrifuge with your tubes.
If one spills hydrochloric acid on one's hands, what is the FIRST thing one should do?
Rinse them in running water.
(a) When the procedure says "condition the graduated cylinder with vinegar before using it", what does that mean?
Rinse with vinegar solution several times.
The following items concern safety in the Enthalpy Change lab.
The chemical solutions in this experiment are dilute but corrosive. If any of them splash into your eyes, you should first flush them in the eyewash. Your lab partner or another student should then notify your instructor about any accidents. If the solutions spill on your skin or clothing, you should immediately flush the area with water.
(a) What should be done with the wastes from Part A1 (Ranking Oxidizing Agents) of the experiment?
The contents of the well plate should be rinsed into the labeled waste container, They should be put in the container for oxidizing agents.
(c) What should be done with liquid waste from Part A2 (Ranking Reducing Agents) of the experiment?
The liquid waste can be flushed down the sink with water.
(e) What should be done with the wastes from Part B (Half-cell Potentials) of the experiment?
The solutions should be rinsed into the waste container for redox solutions, The metal wires should be rinsed and returned to the set-up sheet to be used by the next lab section.
The wastes in the Molecular Modeling experiment should be disposed of in the following way.
There will be no waste material in this experiment.
The wastes in the Solid State Modeling experiment should be disposed of in the following way.
There will be no waste material in this experiment.
At the end of the Equilibrium and Le Châtelier's Principle experiment, wastes from Part C should be disposed of in the following way.
They should be flushed down the sink with plenty of water.
What should be done with the wastes in the Flame Test experiment?
They should be flushed down the sink with plenty of water.
While working on the Equilibrium and Le Châtelier's Principle experiment, wastes from Part A and B should be kept in the following way.
They should be kept in a labeled beaker at the bench, They should be disposed of in the labeled container.
When the centrifuge process is complete, students should do which of the following?
Wait for the rotor to come to a complete stop before attempting to remove your test tubes, Using the eyehole on top, monitor the spinning rate and open the lid only after the rotor has slowed significantly.
The following items concern waste disposal in the Enthalpy Change lab.
Waste from Part A should be flushed down the sink with water. Waste from Part B should be rinsed into the proper waste container. Waste from Part C should be flushed down the sink. Waste from Part D does not exist.
(b) What should be done to avoid exposure to the vapors?
Work with it under a hood and avoid inhaling the vapors.
(a) Select all of the following that are listed as corrosive.
acetic acid (HC2H3O2) ammonia (NH3) hydrochloric acid (HCl) sodium hydroxide (NaOH)
In the lab, a student must wear safety glasses or goggles...
at all times.
In the flame test experiment, you will be working with two types of hazard. Which are they? (Select all that apply.)
hydrochloric acid, corrosive solution, open flame
Proper attire for lab includes which of the following? (Select all that apply.)
pants that extend to the ankles, shoes that cover the heels and toes, a shirt that covers the shoulders and extends about 6" below the waist, a shirt and pants that overlap about 6" in the middle to cover the torso
(c) Because acid-base reactions are highly exothermic, which of the following should you NOT mix together?
solutions with concentrations greater than 0.1 M
(b) The valve on the bottom of the burner controls which of the following?
the gas flow
(a) What is the hottest part of a Bunsen burner flame?
the tip of the inner, dark blue cone
(d) When cleaning the wire between flame tests, most of the cleaning is accomplished when?
while rinsing the wire with acid