Circle one correct answer for each 1. Regular prescription glasses a. offer adeq

Question

Circle one correct answer for each 1. Regular prescription glasses a. offer adequate protection b. should be e. need to be kept out of labs because they can break or goggles 2Whichofthe folloing is nor lamamabie? a acetone chlorofornm c. ethanol 3. What types of shoes are acceptable? a. only steel toe boots b. sandals except when we handle corrosive chemicals Sturdy, closed shoes will be f sturdy, closed shoes will be fine 4. How should you handle a mercury spill from a broken thermometer? a. sweep it up with a broom just leave it to evaporate immediately report it to your instructor 5. What are you allowed to do without direct supervision? a. nothing, all my activities have to be supervised b. it's ok to work on lab reports and take melting points by myself, but no unsupervised experiments c. after the third lab I will be allowed to experiment on my own 6. What are you required to do to prepare yourself for a mishap? always cover your hair b.jalways cover your skin and regular clothing (by wearing a lab coat or scrubs) and regular ckdhing (by wearingalabcoat wear gloves at all times 7. The release of what is a common hazard when working with nitric acid? a. ozone b. nitrous oxides c. chlorine 8. We know that strong acids can bum our skin. What about strong bases? a. Our skin can handle those just fine b. They can burn our skin, too. c. Only people with sensitive skin have to worry about those 9. A percutaneous toxin will... a)penetrate your skin have to be injected to be toxic c. be safe to touch, but not to ingesting by mouth 10. Surplus solvents... a. should be dumped into the sink b)should be collected in a waste solvent storage container c. should be left out to evaporate

Explanation / Answer

Solution:

(1) Regular prescription glasses are not good for eye protection while working in a chemical lab. So, the first choice is not correct. As one need these for eye vision so they could not be removed. It means third choice is also not correct.

Hence the correct choice is (b) should be worn in combination with safety glasses or goggles to protect the eyes.

(5) (a) Nothing. all my activities have to be supervised.

(7) Nitric acid is HNO3 and it would be releasing N2O(nitrous oxide) which is hazardous.

(12) The only acid is H2SO4 that gets very hot when mixed with water because the het of hydration is very high and it is exothermic reaction that releases lots of heat.

(13) Most dangerous vapors are the ones that are odorless as you can't know if they are present.

(15) Acetone is highly flamable so the greatest fire hazard would be posed by it.

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