Chemistry:2011:CBSE [ All India] Set I

The IUPAC name of CH₂=CHCH₂Br is 3-bromopropene.

There is a gradual decrease in atomic and ionic radii of lanthanoids (from lanthanum to lutetium) with an increase in atomic number. This is known as ‘lanthanoid contraction’.

When dehydration of ethanol is carried out at 443 K, ethene is formed. The following chemical reaction takes place.

The structure of 4-chloropentan-2-one is as follows:

Order of a reaction is the sum of the exponents to which the concentration terms are raised in the rate law expression.

A catalytic reaction that depends upon the pore structure of the catalyst and on the size of the reactant and the product molecules is called shape-selective catalysis.

For example, catalysis by zeolites is a shape-selective catalysis. The pore size present in the zeolites ranges from 260-740 pm. Thus, molecules having a pore size more than this cannot enter the zeolite and undergo the reaction.

Minerals are the naturally occurring chemical substances in the form of which metals occur inside the earth’s crust.

Ores are minerals from which metals can be extracted profitably.

(C₆H₅)₂NH < C₆H₅NH₂ < C₆H₅N(CH₃)₂ < CH₃NH₂

In a simple cubic lattice, the particles are located only at the corners of the cube and touch each other along the edge.
              

By knowing the density of an unknown metal and the dimension of its unit cell, the atomic mass of the metal can be determined.
Let ‘a’ be the edge length of a unit cell of a crystal, ‘d’ be the density of the metal, ‘m’ be the mass of each metal atom and ‘Z’ be the number of atoms in the unit cell.