Sodium Na Magnesium Mg Aluminium Al Zinc Zn Iron Fe Nickel Ni Tin Sn Lead Pb Hydrogen H Copper Cu Less reactive Mercury Hg than hydrogen Silver Ag Platinum Pt Gold Au Gold and platinum are noble metals i.e.,non reactive towards acid, base & other substance. Displacement reaction displacement. Non metal displacement. Metal displacement *More reactive metal displaces a lesser reactive metal from its solution. e.g. Fe + CuSO4-------->FeSO4 + Cu Cu + FeSO4------------>No Reaction Because Cu is less reactive than Fe. Non displacement *Metal reacts with acid & liberates hydrogen gas. e.g. Mg + 2HCl--------->MgCl2 + H2 Double displacement reaction *Reaction in which two ionic compounds in the solution phase react by exchange of their ions. e.g. BaCl2 + Na2SO4--------->BaSO4 + 2NaCl (white p.p.t) Precipitation reaction *Two compounds on mixing react to form an insoluble compound (ppt). e.g. Ca(OH)2 + CO2-------->CaCO3 (milky suspension) Double displacement reaction is also considered as a precipitation reaction. Neutralisation reaction *Acid reacts with base to form salt and e.g.
-If zygote is not formed, the inner wall of uterus breaks which causes bleeding through vagina. This process is called MENSTRUATION. It occurs at a regular interval of 28 days. -The Embroyo gets nutrition from the mother's blood with the help of a special tissue called PLACENTA. -It provides a large surface area for glucose and oxygen to pass from the mother to the embryo. Similarly the wastes from developing embryo are removed to mother's blood through placenta. -The is born as a result of rhythmic contractions of the muscles in the uterus after nine months (36 weeks) of development inside mother's womb, called Gestation Period. -The sexual cycle in a woman continues upto the age of 45 to 50 years. After that the ovary do not release egg. This stage is called Menopause. It a also marks the end of menstruation in the woman. REPRODUCTIVE HEALTH Reproductive Health means a total well-being in all aspects of reproductive, ie., physical emotional, social and behavioral. Contraception : It is the avoidance of pregnancy. Chapter- 16 {Management of natural resources} Management of natural resources is needed for conservation of natural resources. There are national and international laws and Acts to protect the environment. Ganga Action Plan : Multi Crore Project came in 1985 to improve the quality of Ganga Accordingly a survey was conducted and a data was collected of coliform ( a of bacteria found in human intestine) between 1993-1994 National Award for wildlife conservation – In the memory Amrita Devi Bishnoi who lost her life in the protection of Khejri trees in Rajasthan alongwith 363 other people.
Electromagnetic Induction Faraday’s Law of EMI Direction of induced current Activity This is a process of production of electricity (electric current) by the variation of magnetic field across the conductor is called Electromagnetic Induction . First law - Whenever magnetic line of forces change across conductor ,an e.m.f. is induce in it .This induced e.m.f. last so long as the change in magnetic field continues. Second law- The magnitude of the induced e.m.f. is directly proportional to the rate of change of Magnetic flux linked with the conductor (or coil). Fleming -Hand Rule – It use to determine the direction of induced current . According to this rule : “if three finger of right hand arrange mutual perpendicular in such a way that thumb points in the direction of motion of conductor, forefinger points direction of magnetic field, then middle finger indicate direction of induced current .” To draw magnetic line of forces by a bar magnet. To show force on a current carrying conductor place in magnetic field.