ThinkingBrain

  ATOMIC MODELS: The following scientists worked on Atomic Model. 1. J J THOMPSON: proposed a model of Atom consisting of positive and negative charge, present in equal amount so that an atom will be neutrally charged. He proposed that atom was a sphere but the negative and positive charge were embedded in it.  (   DIAGRAM  LEAVE ABOUT 5 LINES) 2. ERNEST RUTHERFORD: Rutherford reversed the Thompson’s model which he showed with his experiment that atom has a small strong nucleus of positively charged. He stated that atom is composed of empty space mostly with electrons orbiting in a set, predictable paths around fixed positively charged nucleus. ( DIAGRAM, LEAVE ABOUT 5 LINES)   3. NEIL BOHR: His model was based on quantum principle. An atom has a positively charged nucleus, and electron travels in around the nucleus in a specified orbit (DIAGRAM, LEAVE ABOUT 5 LINES) DALTON’S ATOMIC THEORY John Dalton, British Physicist and Chemist propose...

  CHEMICAL INDUSTRY: Chemical industry is defined as one that uses chemistry to make chemicals from other chemical substances (raw materials) The important raw materials used in chemical industry include (i) air (ii) CaCO 3 (iii) Sea water and rock salt (iv) Sulphur (v) Metallic mineral ore (vi) Coal           (vii) Natural gas and petroleum. SOURCES OF RAW MATERIALS IN CHEMICAL INDUSTRY AIR: Air is the chief source of O 2 and N 2 . N 2 is important because it is used in the manufacture of NH 3 . NH 3 itself is used in the manufacture of trioxonitrate (v) acid which is used in the making of explosives, plastics and other materials. NH 3 is also used in the manufacture of NH 4 + salts like HN 4 O 3 , (NH 4 ) 2 SO 4 which are used in manufacturing fertilizers.   CALCIUM TRIOXOCARBONATE (iv) (CaC0 3 ): CaCO 3 in the form of lime stone, chalk and marble is the source of lime or calcium oxide which is used for mak...

    THIRD TERM SCHEME OF WORK Week 1 :    Computer virus (meaning, types of computer virus, example of computer          virus).                                                                    Week 2  :   Source of computer virus. Week 3  :    Virus warning signs. Week 4 :      Virus detection (Anti - virus). Week:      5 - 6 ;     Revision Week:    7-12  revision and examination. WEEK 1. COMPUTER VIRUS A computer virus is a malicious code designed to spread from ...

SCHEME Week 1. Human Reproduction 1. 2. Human Reproduction 2 3. Forces 4. Calculations on Gravitation. 5. Space Travel. 6. Gravitation and Weightlessness 7 & 8. Earth in space 9. Satellite 10. Consequency /Implication of Teenage pregnancy. 11 & 12. Revision and Examinations WEEK 1 HUMAN REPRODUCTION MENSTRUATION : menstruation is the monthly shedding of the inner lining of the uterus when fertilization does not occur. It's also the monthly flow of blood from the vagina. The process of preparation of the lining of the womb and the shedding of the inner lining happens every 28 to 30 days. The time from one period to the beginning of the next one is called MENSTRUAL CYCLE. Menstruation occur between 3 - 5 days. Menstruation stops during pregnancy and resumes after the birth of the baby. B) OVULATION : is the monthly release of the egg from the ovary. Ovulation usually occur 14 days before the start of the menstrual bleeding. It is difficult to predic...