Cement oxide (Na2O) 0.1-0.5%, Sulphur Trioxide
A cement is a binder, a substance that sets
and hardens and can bind other materials Portland cement consists essentially of
together. compounds of lime (calcium oxide, CaO)
Concrete = Cement + water + sand + mixed with silica (silicon dioxide, SiO2) and
gravel alumina (aluminum oxide, Al2O3). The lime is
Plaster = Cement + water + sand obtained from a calcareous (lime-containing)
Mortar = Cement + lime + sand raw material, and the other oxides are derived
from an argillaceous (clayey) material.
Composition of cement
Lime (CaO) 60-65%, Sillica (SiO2) 20-25%,
Alumina (Al2O3) 4-8%, Iron Oxide (Fe2O3) 2- It is the chemical substances used for
4%, Magnesium Oxide (MgO) 1-3%, Sodium diagnosis, treatment, and prevention of disease
Classes of Medicine
Class Cure/treatment/prevent Medicine(s)
Antipyretics fever aspirin, paracetamol, analgin, novalgin,
(pyrexia/pyresis) phenacetain, etc.
Analgesics pain aspirin, paracetamol, morphine, etc.
Antimalarial drugs Malaria chloroquin
Antibiotics inhibiting germ growth penicillin, ampicillin, amoxicillin,
Antiseptics Prevent germ growth near Dettol, Savlon, Boric acid, hydrogen
burns, cuts and wounds peroxide, etc.
Mood stabilizers moderate the manic highs lithium, valpromide, etc.
and bipolar disorder
Hormone replacements - Premarin, Angeliq, etc.
Oral contraceptives -
Stimulants - methylphenidate (Ritalin)
Tranquilizers - meprobamate, chlorpromazine, reserpine,
chlordiazepoxide, diazepam, etc.
Statins - lovastatin, pravastatin, and simvastatin,
These are substances whose molecules have It is a synthetic material made from a wide
high molar masses and are composed of a range of organic polymers such as
large number of repeating units. There are polyethylene, PVC, nylon, etc. Types of
both naturally occurring and synthetic Plastic : Thermoplastics and Thermosets
polymers. Among naturally occurring Thermoplastics which are softened by
polymers are proteins, starches, cellulose, and heat and can be moulded. (Injection
latex. moulded, blow moulded or vacuum
formed). e.g. acrylic, polypropylene,
polystyrene, polythene and PVC.