X SSC

Periodic classification of elements

1. Introduction-

Quadratic equation: Part-3

5) Relation between roots and coefficients of Quadratic equation:
Let α and β be two roots of quadratic equation then:
α + β= -b/a (α .β)= c/a
Question : If α and β are roots of x2 +5x -1 = 0 find α3 + β3 
solution: As by comparing with Standard form a= 1 b= 5 c= -1
 α + β =-5 α .β…

Quadratic Equation: Part-2

Methods of solving Quadratic Equation:
There are three methods of solving Quadratic Equation namely:
1) Factorization method
2) Completing square method
3) Formula method

Quadratic Equations: Part-1

Defination:
We have studied various types of polynomials. A polynomial with degree 2 is called as Quadratic Equation. A Quadratic equation in the variable x is an equation of the form ax2 + bx + c =0, where a, b, c are real numbers , a is not 0. Example: 2 x2 + x-300=0.
Standard…

Periodic classification of elements

Learning the Modern Periodic table-

Answers: Balance the following chemical equations

Questions-

a. CO2 + H2O — — -> C6H12O6 + O2.

b. SiCl4 + H2O — — → H4SiO4 + HCl.

c. Al + HCl — — → AlCl3 + H2.

Chemical changes and reactions

1. Chemical equations-

Chemical Reactions and Types

1. Physical and chemical changes-