module 3

Question 1

refers to the arrangement, type, and ratio of atoms in
molecules of chemical substances.varies when chemicals are
added or subtracted from a substance, when the ratio of substances changes, or when
other chemical changes occur in chemicals.

Answer 1

Chemical composition

Question 2

indicates the elements which

are combined together to form that material.

Answer 2

chemical composition of engineering material

Question 3

represents how atoms are bounded to each other to form the
material. Many properties, such as melting point, boiling point, thermal conductivity and
electrical conductivity of materials are governed by it

Answer 3

Atomic bonding

Question 4

types of Atomic bonds in materials are :

Answer 4

Ionic Bonds, Covalent Bonds, Metallic Bonds

Question 5

is the complete transfer of valence electron(s) between atoms. It is
a type of chemical bond that generates two oppositely charged ions.

Answer 5

Ionic Bonds

Question 6

This type of bonding occurs between two atoms of the same element or of
elements close to each other in the periodic table.

Answer 6

Covalent Bonds

Question 7

is a type of chemical bonding that rises from the electrostatic
attractive force between conduction electrons (in the form of an electron cloud of
delocalized electrons) and positively charged metal ions.

Answer 7

Metallic Bonds

Question 8

is a gradual chemical or electrochemical attack on a metal by its
surrounding medium. due by it metal starts getting converted into an oxide,
salt or some other compound.

Answer 8

Corrosion

Question 9

is the ability of material to resist the oxidation in
atmospheric condition. Generally pure metals such as iron, copper, aluminum etc. gets
corroded in slowly in atmosphere.

Answer 9

Corrosion resistance of a material is

Question 10

is a measure of a solution’s capacity to react with a strong base (usually
sodium hydroxide) to a predetermined pH value.

Answer 10

Acidity

Question 11

is the measure of a solution’s

capacity to react with a strong acid (usually sulfuric acid) to a predetermined pH.

Answer 11

Alkalinity

Question 12

The materials which are having pH value below 7 are called

Answer 12

Acetic

Question 13

Materials which are having pH value greater than 7 are called

Answer 13

alkane.

Question 14

indicates that how they react with other materials.

Answer 14

Acidity of

Alkalinity of material