Test 4 (chem)

What is a unit cell?

A unit cell is the smallest repeating structural unit of a crystal lattice that defines the symmetry and structure of the entire crystal.

Allotropy

Allotropy is the existence of a substance in two or more different forms, called allotropes, which have distinct physical and chemical properties.

What is the coordination number of body-centered cubic (BCC) structure?

The coordination number of a body-centered cubic (BCC) structure is 8.

Write down the coordination no of FCC

The coordination no of FCC is 12

Write down the relationship between edge length and atomic radius for BCC

The relationship between edge length and atomic radius for BCC is √3a=4r

Write down the relationship between edge length and atomic radius for FCC

Between atlants and atomic radius for fcc is √2a=4r

How does catalyst act?

Speeds up a chemical reaction, or lowers the temperature or pressure needed to start one, without itself being consumed during the reaction.

Define reaction intermediate

a reaction intermediate, or intermediate, is a molecular entity arising within the sequence of a stepwise chemical reaction. It is formed as the reaction product of an elementary step, from the reactants and/or preceding intermediates, but is consumed in a later step. It does not appear in the chemical equation for the overall reaction.

Give example of hexadentate ligand

An example of a Hexadentate ligand is Ethylene Diamine Tetra Acetic Acid (EDTA).

Define effective atomic number

Effective atomic number (EAN), number that represents the total number of electrons surrounding the nucleus of a metal atom in a metal complex. It is composed of the metal atom's electrons and the bonding electrons from the surrounding electron-donating atoms and molecules.t

Coordination compounds used as anti cancer

Cis−[PtCl2NH3)2] known as cis platin is used as an anticancer