Science Lab

RULES & SAFETY PRECAUTIONS

• NEVER enter the lab unless a teacher is present. • DO NOT eat, drink or taste any chemicals. • Always FOLLOW the teacher’s instructions. • NEVER touch chemicals with your bare hands. Use a SPATULA. • READ the label on a reagent bottle before using its content. • TURN OFF the Bunsen burner after use. • Do NOT pour back any unused

RULES & SAFETY PRECAUTIONS

• DO NOT THROW solid wastes into the sink. • WASH & KEEP all apparatus after use. • DO NOT RUN or PLAY in the laboratory. • DO NOT TEST anything without the teacher’s permission. • REPORT any breakages to the teacher. • KEEP the bench clean & tidy.

PLEASE PAY ATTENTION TO YOUR TEACHER!!!

EXPLOSIVE

• Easily explodes when mixed with other substances. • Examples : sodium, potassium, concentrated acids & alkalis.

FLAMMABLE/ INFLAMMABLE

• Easily cathes fire & burn. • Examples : organic solvents (ethanol, petrol & kerosene)

Toxic/ poisonous • Causes death or harm to the body if absorbed through the skin, swallowed or inhaled. • Examples : mercury, chloroform, lead, benzene, bromide, sodium cyanide, hyrogen sulphide.

corrosive

• Causes damages to the skin or eyes upon contact. • Examples : concentrated acids & alkalis, bromine, hydrogen peroxide.

Irritant/ harmful

• irritates (causes itch & rashes) skin, eyes & respiratory system. • Examples : ammonia solution, chloroform, dilute acids & alkalis.

radioactive • Give out radiation that can cause cancer or destroy body tissues. • Examples :

uranium, plutonium, radium.