Test 4 (chem)

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What is a unit cell?

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12 Terms

1

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.

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2

Allotropy

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

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3

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

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

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4

Write down the coordination no of FCC

The coordination no of FCC is 12

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5

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

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6

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

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

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7

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.

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8

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.

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9

Give example of hexadentate ligand

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

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10

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

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11

Coordination compounds used as anti cancer

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

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12
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