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lab safety
| Question | Answer |
|---|---|
| Whom should you call in case of an emergency in the lab? | instructor |
| What would immediately be used if your clothing caught fire or if a large chemical spill had occurred on your clothing? | safety shower |
| What should be worn in a laboratory at all times to decrease the likelihood of eye injury? | safety glasses |
| What should be done if a chemical gets in the eye? | Use the eye-wash fountain; then notify the instructor . |
| Why is it not advisable to wear contact lenses in the lab? | Lenses could inadvertently fall out of the eye ,Chemical vapor could become trapped between the lenses and the eye,chemical vapor could literally react with the lenses |
| Describe the procedure used to operate a fire extinguisher | Remove pin from handle; Squeeze handle ,Aim extinguisher hose (if any) at base of fire; Squeeze handle ,Remove pin from handle; Aim extinguisher hose (if any) at base of fire; Squeeze handle |
| How can a small contained fire be extinguished most easily? | Smother the fire with a small container (i.e., a beaker) . |
| What precautions are needed with long hair and long sleeves? | Keep long hair tied back/keep hair away from flames, roll up sleeves . |
| What type of footwear is required in the lab? | Hard-soled, covered shoes. |
| Eating and drinking are not permitted in the lab because: | You could be poisoned.` |
| Are there any conditions under which a student may work alone? | no |
| Why are no unauthorized experiments permitted in the lab? | The student lacks experience in the lab . |
| What should be the very last function performed in the lab before you leave? | wash your hands |
| Describe the procedure for smelling a chemical. | Point vessel away from face while gently fanning vapors toward nose . |
| types of burns | thermal, chemical and electrical |
| what is a chemical burn | Living tissue is exposed to a reactive chemical substances such as a strong acid or base. .Can occur on contact/fumes to skin/air way |
| accuracy | hits the target or hits the bullseye |
| precision | hits the same spot (reproducibility) |
| % error | accepted value-experimental value / accepted value time 100. ABSOLUTE VALUE |
| SI units-time | seconds |
| SI units-temperature | kelvin |
| SI units-volume | L |
| SI units-length | km |
| SI units-mass | kg or g |
| SI units-amount of a substance | mole |
| volume-L | for liquid |
| volume- L times W times H | for solid (square, rectangle) |
| volume- water displacements for _____ shapes | odd |
| do what you otter.... | add acid to water |
| quan. | numbers |
| qual. | description. ex: few. red |
| independent Variable | MIX. variable experimenter manipulates or changes |
| dependent variable | DRY. what is being measured in the experiment |
| control | the group that remains unchanged in an experiment |
| scientific method steps | 1. make an observation. 2.ask a question 3. make a hypothesis 4.conduct an experiment 5.draw conclusions 6.report your results |
Created by:
katiebahl