Chemist

A valency is a property of a groups or atoms, equal to the number of atoms of hydrogen that the group or atom could combine with or displace it in forming compounds.

Both techniques are used to the amount of chemical present in the solution. However they are almost similar but differs in

Molarity:

► Molarity is used to know the total amount of molecules in a 1 litre solution

► It is expressed as moles of a compound per litre of solution

Normality:

► Normality is used to know the total number of reactive units in 1 litre of solution

► It is expressed in equivalent per litre

Aliquot : It is a measured sub-volume of original sample

Diluent : Material with which sample is diluted

Titration is a process to determine the molarity of a base or an acid. In this process a reaction is carried out between the known volumes of a solution with a known concentration, against the known volume of a solution with an unknown concentration.

The monomer of polyethene is ethylene

Fe or ferrous is the metal that is used to extract copper from the solution of copper sulphate.

Molality is the number of solute that is present in 1 kg of a solvent.

In order to calculate the pH of a solution you have to use the formula pH= -log [H+] or pH = -log [H3O+]

Mole is the unit used to define the number of chemical substance present in a substance. It is the amount of substance which consists of the same number of chemical units as there are atoms in exactly 12 gram of pure carbon-12.

Oxidation = When there is a loss of hydrogen or electrons, OR gain of oxygen is known as Oxidation reaction.

Reduction = When there is a gain of hydrogen or electron OR loss of oxygen is known as reduction reaction

Example of oxidation-reduction reaction is observed in human body, when an electron is transferred into the cell and oxidation of glucose take place from which we get the energy.

In buffer when hydrogen ion is added, it will neutralized by the base in buffer. Hydroxide ion will be neutralized by the acid. On the overall pH of the buffer solution, these neutralization reactions will not show much effect.

While when you select an acid as a buffer solution, try to use an acid acid that has a pH closed to your desired pH. This will help your buffer to achieve nearly equivalent amount of acid and conjugate base, so that it will enable to neutralize as much as H+ and OH -.

Graphite rod is used in nuclear reactor to convert fast moving neutrons into thermal neutrons.

A buffer is an aqueous solution which has highly stable pH. It is a blend of a weak acid and its conjugate base or vice versa. On adding small amount of base or acid to buffer, its pH hardly changes.

To know the amount or volume of NaOH to prepare 400 mL of 1.5 M NaOH, we use formula

M1 X V1 = M2 X V2

V1 = M2 X V2/ M1

But before that we will convert 400 mL into litre = 0.4 L

5.5 X V1 = 1.5 M x 0.4 L

V1 = 1.5 M X 0.4L/ 5.5

V1= 0.10 L

V1 = 100mL

So, you need 100mL of 5.5 NaOH

1. 80% of evaporation comes from the ocean.

2. 20% of evaporation comes from inland water.

3. Wind helps evaporation by moving it

You cannot extract ephedrine or pseudo ephedrine from a mineral block. Anyone who tells you that they have done it is either mistaken or a liar.

Organic Chemistry is the chemistry of the compounds of carbon along with other elements such as are found in living organisms and elsewhere.

In a molecule when hydrogen atom is less than the ratio of carbon atom, then such molecules are referred as an organic molecule.

The IUPAC name for Benzene is Benzene. It forms the basis for other IUPAC-named benzene derivatives like 1, 2-dimethylbenzene etc.