Green House effect: The trapping of the sun’s warmth in a planet’s lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet’s surface. Global warming: Global Warming is the increase of Earth’s average surface temperature due to effect of greenhouse gases, such Read more about Green House Effect & Global Warming[…]
Force on the side wall of the vessel cannot be directly determined as at different depths pressures are different. To find this we consider a strip of width dx at a depth x from the surface of the liquid as shown in figure, and on this strip the force due to the liquid is given Read more about Force on Side Wall of a Vessel[…]
Centroid: The centroid of a triangle is the point of intersection of medians. It divides medians in 2: 1 ratio. If A(x1, y1), B(x2, y2), C(x3, y3) are vertices of triangle ABC, then coordinates of centroid is .In center: Point of intersection of angular bisectors Coordinates of . Where a, b, c are sides of triangle Read more about Centroid, Circumcentre, Orthocentre, Incentre of Triangle[…]
Silicones: These are organosilicon polymers containing Si-O-Si linkages. These are formed by the hydrolysis of alkyl or aryl substituted chlorosilanes and their subsequent polymerization. The alkyl or aryl substituted chlorosilanes are prepared by the reaction of Grignard reagent and silicon tetrachloride. RMgCl + SiCl4 → R−SiCl3 + MgCl2 2RMgCl + SiCl4 → R2SiCl2 + 2MgCl2 3RMgCl + SiCl4 → R3SiCl + Read more about Compounds of Silicon[…]
(1) Translatory equilibrium: When a body of density ρ and volume V is immersed in a liquid of density σ, the forces acting on the body are Weight of body W = mg = Vρg, acting vertically downwards through centre of gravity of the body. Up thrust force = Vσg acting vertically upwards through the centre Read more about Floatation[…]
Let O be the origin and let X’OX and Y’OY be the axis of x and y respectively. Let O’ and P be two points in the plane having coordinates (h, k) and (x, y) respectively referred to X’OX and Y’OY as the coordinate axes. Let the origin be transferred to O’ and let X’OX’ Read more about Transformation of Axes[…]
Formed due to catenation and pπ-pπ bond formation of carbon. 1. Diamond: Has crystalline lattice Carbon atom undergoes sp3 hybridisation Shape: tetrahedral C-C bond length = 154 pm Hardest substance Uses: Diamond paste is used in polishing Used as abrasive in sharpening hard tools which are used for cutting, grinding etc. Used as a gemstone 2. Read more about Allotropes of Carbon[…]
Elastic Property of Matter: (1) Elasticity: The property of matter by virtue of which a body tends to regain its original shape and size after the removal of deforming force is called elasticity. (2) Plasticity: The property of matter by virtue of which it does not regain its original shape and size after the removal Read more about Elasticity[…]
Definition of Locus: The curve described by a point which moves under given condition or conditions is called its locus. Equation to the locus of a point: The equation to the locus of a point is the relation which is satisfied by the coordinates of every point on the locus of the point. Algorithm to Read more about Locus and its equations of co-ordinates[…]
Preparation: 4BH3 + 3LiALH4 → 2B2H6 + 3LiF + 3AlF3 2NaBH4 +I2 → B2H6 + 2NaI + H2 2BF3 + 6NaH → B2H6 + 6NaF Structure: Diborane contains four terminal and two bridging hydrogen atoms The terminal H atoms and B atoms lie in one plane. The bridging H atoms lie above and below the plane Properties: Colourless highly toxic gas B.P : 180 K Catches Read more about Diborane Structure[…]