Ionic Charges and Silicate Structures

The video tutorial explores the significance of silicon in the Earth's crust, focusing on its bonding with oxygen to form silicates. It explains how to determine the charge of silica and alumina silicate ions using oxidation numbers and provides examples to illustrate these calculations. The tutorial also covers complex silicate formulas, demonstrating how to balance charges with metal cations and hydroxide ions.

What is the second most common element in the Earth's crust?

• Silicon

• Iron

• Oxygen

• Aluminium

Which method involves using oxidation numbers to find the charge of silica ions?

• Molecular geometry

• Using oxidation numbers

• Electronegativity differences

• Balancing equations

What is the oxidation number of silicon used in the charge calculation?

• +5

• +4

• +3

• +2

In the example of aluminosilicate ion, what is the overall charge calculated?

• -4

• -2

• -3

• -1

What is the charge of a sodium ion used in balancing aluminosilicate ions?

• +1

• +4

• +2

• +3

How many hydroxide ions are present in the serpentine example?

• 10

• 4

• 6

• 8

What is the charge of the silicate ion in the pyrope example?

• -3

• -2

• -4

• -5

How many magnesium ions are needed to balance the charge in the serpentine example?

• 4

• 5

• 6

• 7

In the pyrope example, how many aluminium ions are present?

• 4

• 3

• 2

• 1

What is the overall formula of the silicate in the serpentine example?

• Mg5SiO10(OH)8

• Mg6SiO10(OH)8

• Mg4SiO10(OH)8

• Mg3SiO10(OH)8