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Just in case you are wondering what MESS is about,
it is a collaborated educational blog.

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This blog is officially opened in 21 August 2009




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Tuesday, December 8, 2009
S1 Science Chapter 1.2 : Where do Scientists work? @ 6:57 PM


S1 Science Chapter 1.2 : Where do Scientists work?
Scientists often work in a laboratory. However, they are not confined to it. 
For example:
  1. Geologists work outside to collect rock samples & study the structure of Earth.
  2. Environmentalists work outside to collect samples to check the acidity level of streams & pollutants in air.
Types of Labs:
  • School Lab
  • Space Shuttle 
  • Forensic Lab
Safety Rules in a Lab
Do’s
Don’ts
Follow instructions
Eat or drink
Keep the Lab Clean & Tidy
Leave used apparatus unwashed
Wear Safety Goggles to protect eyes
Taste chemicals
Report to Teacher of any accident, spillage or breakage
Dispose solid waste into the sink
Wash your hands after all experiments
Put back unused chemicals back into the reagent bottles

Hazardous Substances

- Poisonous if breathed in, swallowed or absorbed through the skin (E.g. Alcohol, Mercury)
Flammable Substances

- Easily Ignite & burn (E.g. Petrol, alcohol)








Corrosive substances

- Destroy living tissues including skin & eyes. (E.g.  Concentrated Acids)




Harmful/Irritating substances 
- Involve Health risk/ irritate the skin (E.g. Ammonia solution, thinner, dilute acids)


First Aid in Labs
Injury
What to Do
Burn from Hot liquid/ Equipment
Cool the affected area with running water
Substances that get into the eye
Wash the eye with Eyewash
Small Cut
Remove dirt/glass. Wash with cold water. Place a clean dry dressing on the cut
Emergency Response
When spilled Alcohol catches fire, DO NOT pour water on it. Water is denser than alcohol, thus it may help spread the fire. Use a Damp Cloth to cover the burning alcohol instead.


Lab Apparatus
-          Test Tube
-          Filter Funnel
-          Beaker
-          Conical Flask
-          Flat-bottomed Flask
-          Round-bottomed Flask
-          Retort-stand
-          Tripod Stand
-          Evaporating Dish
Bunsen Burner
-          Named after German Scientist Robert Bunsen
-          When the air-hole is open, the flame is blue in colour and is suitable for heating
-          When the air-hole is closed, the flames is yellow and colour and is calles a luminous flame. It produces a lot of soot, thus unsuitable for heating.




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