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9 you are heating a piece of glass and now want to pick it up. you shou…

Question

9 you are heating a piece of glass and now want to pick it up. you should a use a rag or paper towels. b pick up the end that looks cooler c use tongs. d pour cold water on it 10 you have been injured in the laboratory (cut, burn, etc.). first you should a visit the school nurse after class b see a doctor after school c tell the science instructor at once. d apply first aid yourself 11 when gathering glassware and equipment for an experiment, you should a read all directions carefully to know what equipment is necessary. b examine all glassware to check for chips or cracks c clean any glassware that appears dirty d all of the above. 12 you want to place a piece of glass tubing into a rubber stopper after the tubing has been fire polished and cooled. this is best done by a lubricating the tubing with water or glycerin b using a towel or cotton gloves for protection c twisting the tubing and stopper carefully d all of the above 13 personal eyeglasses provide as much protection as a a face shield b safety glasses c splashproof chemical goggles d none of the above

Explanation:

Brief Explanations
  • Para el primer caso, el uso de pinzas es la forma más segura de recoger un objeto de vidrio caliente, ya que evita quemaduras.
  • En caso de lesión en el laboratorio, es importante informar inmediatamente al instructor de ciencias para que se tomen las medidas adecuadas.
  • Al recopilar vidrieras y equipo para un experimento, se deben leer las instrucciones, examinar el material y limpiarlo si es necesario.
  • Para insertar un tubo de vidrio en un tapón de caucho, se debe lubrificar, usar protección y hacer una torsión suave.
  • Las gafas personales no brindan la misma protección que un escudo facial, gafas de seguridad o anteojos resistentes a salpicaduras.

Answer:

  • 9. C. usar pinzas.
  • 10. C. decirle al instructor de ciencias inmediatamente.
  • 11. D. Todo lo anterior.
  • 12. D. Todo lo anterior.
  • 13. D. Ninguno de los anteriores.