elements ung main topic for todays vidyeow :0

LAS 4 : Laboratory rules

1. Keep silent - observe silence inside the laboratory room.

2. Follow your teacher’s directions - give your full attention while listening to the teacher. Do not begin the experiment until you know what to do.

3. Notify your teacher of problems - if you spill anything, break a piece of glassware, cut yourself or encounter any problems, notify your teacher immediately.

4. Know how to use safety equipment in the laboratory - your laboratory may have emergency exits, first aid kits, and eyewash stations. Learn where this equipment is located and how to use it.

5. Do not hang around - avoid loitering inside the laboratory room.

6. If it’s hot, let it cool - the tongs, gloves or other equipment may be provided for handling objects, but the safest strategy is to let the objects cool before attempting to move them.

7. Carry chemicals defensively - when carrying chemicals from one place to another, walk slowly and keep a watchful eye for classmates who may blunder into your path.

8. Dispose of chemical waste properly - your teacher will tell you how to dispose of chemical waste properly.

9. No "horseplay" – avoid unnecessary movements inside the laboratory room.

10. Clean up afterward - leave the laboratory neatly than you found it. Wash your hands before leaving.

LAS 5 : Elements of the Periodic Table

Examples :

Non-metals :

H - hydrogen –O - oxygen – C - carbon N - nitrogen

Metals :

iron - Fe (ferum) sodium – Na (natrium) gold – Au (aurum) silver – Ag (argentum)

Metalloids :

Silicon ( Si ), Boron ( B ), Germanium ( Ge ), Arsenic ( As ) Antimony ( Sb ),

Tellurium ( Te )

LAS 3 :

Used to hold hot objects :

Crubicle Tongs

A wide – mouthed container used to transport, heat or store substances; not reliable for accurate volume measurement :

Beaker

A small glass container is used to view chemical reactions or to heat small amounts of a substance :

Test Tube

A device to measure the mass of an object or substance. :

Triple Beam Balance

Used to dispense a very small amount of a liquid :

Dropper

Attaches to lab stand and used to hold a variety of lab equipment :

Ring Clamp

Used to hold a variety of lab equipment, especially during a reaction in which a heat source is being used. :

Ring Stand / Lab Stand

Used to measure volume very precisely :

Graduated Cylinder

Used to pour liquids into containers with small openings or to hold filter paper :

Funnel

read las 3 im tired of copy and pasting