Chemistry 2ND SEM (Part I)

Question 1

5 Basic Molecular Structures

Answer 1

Linear (2)
Trigonal (3)
Tetrahedral (4)
Trigonal Bipyramidal (5)
Octahedral (6)

Question 2

Who said “ Each of the five classical elements(ether, earth,air,fire, andwater) has a shape. “

Answer 2

Plato

Question 3

A ______________is a regular, convex polyhedron with congruent faces of regular polygonsand the same number of faces meeting at eachvertex.Five solids meet those criteria, and each is named after its number of faces.

Answer 3

Platonic solid

Question 4

All the solid angles are equivalent.

Answer 4

platonic solid

Question 5

All the vertices are surrounded by the same number offaces.

Answer 5

Platonic Solid

Question 6

The building blocks of the universe according to Plato (5)

Answer 6

Earth, Water, Fire, Air, Ether.

Question 7

There are two main types of chemical bonds:

Answer 7

Ionic Bonds
Covalent Bonds

Question 8

resulting from electrostatic attraction between cations and anions

Answer 8

Ionic Bonds

Question 9

resulting from sharing of one or more electron pairs between two atoms

Answer 9

Covalent Bonds

Question 10

Between atoms with very different electronegativities
Transfer of electrons produce charged ions
Typically crystalline structures (rigid and brittle)

Answer 10

Ionic Bonds

Question 11

Between atoms of similar electronegativities
Sharing a pair of electrons
In most compounds, the representative elements achieve noble gas configurations

Answer 11

Covalent Bond

Question 12

Electrons which are shared among two atoms are called ____________________

Answer 12

bonding electrons

Question 13

Unshared electrons are called (2)

Answer 13

lone pairs or nonbonding electrons

Question 14

Valence-shell electron pair repulsion

Answer 14

VSEPR Theory

Question 15

Distribution of regions of high electron density around the central atom

Answer 15

Electronic geometry

Question 16

Arrangement of atoms around the central atom

Answer 16

Molecular geometry

Question 17

Dipole moments for all bonds cancel out

Answer 17

Nonpolar Molecule

Question 18

Dipole moments for all bonds don’t cancel out – the molecule has the resulting net dipole moment

Answer 18

Polar Molecule