Safety Unit
True or false; It is okay to leave broken glass on the lab floor as long as it is not on the lab tabletop as well.
False
True or false; It is okay to work in the lab alone.
False
True or false; When diluting acid, you should always add water to acid, in that order.
False
**True or false; paper towels are considered safety equipment.
Flase
True or false; Burners can be left unattended as long as the flame is yellow.
Flase
What is the definition of accuracy?
How close a measured value is to the accepted or true value.
What is the definition of precision?
How close several measurements of the same event are to each other.
What is the corrects procedure for students if a chemical is spilled?
Stand back and advise the teacher of the spill.
The precision is often expressed by what statistical calculation?
Standard deviation.
In most labs, accuracy is determined by calculating what?
The percent accuracy error.
**True or false; a fire blanket is considered safety equipment.
True
True or false; All of these things should be part of the checkout at the end of the lab; Water turned off, gas turned off, all equipment is cool, clean and neatly arranged.
True
True or false; Be sure that the gas is shut off to your Bunsen burner when you leave the lab.
True
True or false; Broken glass and bio-waste are disposed of in special containers for broken glass and bio-waste, not in general waste cans.
True
True or false; Consider all chemicals to be hazardous unless you are instructed otherwise.
True
True or false; Excess chemicals are never to returned to stock bottles.
True
True or false; If someone has a corrosive chemical splash in their eye, they should stay in the eyewash for 10-15 minutes
True
True or false; You should be aware of hot glass, it looks exactly like cold glass.
True
True or false; You should never use broken or chipped glassware because glass cuts in labs are extra dangerous due to chemicals.
True
True or false; You should never use broken or chipped glassware because it can explode when heated or under pressure.
True
True or false; You should never use broken or chipped glassware because sharp edges can easily cut.
True
What is the only thing, in aqueous solution (dissolved in water), that may be disposed of by pouring down the drain?
Water
A student measured the density of copper as 8.54 g/cm3. She looked up the density of copper in a chemistry book and found it listed as 8.96 g/cm3. What was her percent accuracy error to the nearest 1/100th?
4.69%
Protective clothing and equipment, such as gloves and lab coats, should be removed before leaving the lab because:
Contaminants may be transferred to persons or objects outside the lab.
**An excess of a chemical that has been measured out should be:
Disposed of as waste
True or false; All liquids may be placed in the sink for disposal
False
True or false; Applying makeup is allowed in the lab, but you should never eat or drink in the lab.
False
True or false; If a beaker is cracked, it is okay to heat it as long as it is not leaking.
False
True or false; If there is an accident in the lab, the first thing you should do is go to the phone and dial 911
False
True or false; It is okay to aim a heated test tube toward your face so that you can smell it better.
False
