
Concept explainers
a.
Interpretation:
The number of wafers that can be made from
Concept introduction:
Density is defined as mass per unit volume. Mass and volume are physical quantities and the units of mass and volume are fundamental units. Density is the ratio of mass to the volume. The unit of volume is derived from the units of mass and volume. The SI unit of density is
The formula to calculate the volume of the cylinder is as follows:
Here,
a.

Answer to Problem 12.128P
The number of wafers that can be made from
Explanation of Solution
Rearrange the equation (1) to calculate the volume of
Substitute
The diameter of
Rearrange the equation (2) to calculate the height of
Substitute
The thickness of the wafer is
(b)
Interpretation:
The mass of a wafer is to be calculated.
Concept introduction:
The formula to calculate the mass of the cylinder is as follows:
Here,
(b)

Answer to Problem 12.128P
The mass of a wafer is
Explanation of Solution
Substitute
The shape of the wafer is cylindrical. The mass of a wafer is calculated as
(c)
Interpretation:
The balanced equation for the removal of the oxide layer on the wafer is to be written.
Concept introduction:
In a balanced chemical equation, the total mass of reactants and products are equal in a balanced chemical equation, thus, it obeyed the law of conservation of mass. Also, the amounts of substances in a balanced
Displacement reactions are those in which substances on both sides of the equation remain the same but the atoms exchange places in order to form the product. Displacement reactions can be further classified as a double displacement reaction and a single displacement reaction. In double displacement reaction, both the reactants are the compounds and in single displacement reaction, one of the reactants is an element. The general representation of a double displacement reaction is:
(c)

Answer to Problem 12.128P
The balanced equation for the removal of the oxide layer on the wafer is as follows:
Explanation of Solution
Silicon combines with oxygen to form silicon dioxide. The coating of silicon dioxide interferes with the function of the wafer and is removed by gaseous hydrogen fluoride.
Sulfur displaces the hydrogen from hydrogen fluoride and leads to the formation of silicon tetrafluoride and water. The chemical equation for the reaction is as follows:
Displacement reactions are those in which substances on both sides of the equation remain the same but the atoms exchange places in order to form the product.
(d)
Interpretation:
The moles of
Concept introduction:
Stoichiometry of a reaction is utilized to determine the amount of any species in the reaction by the relationship between the reactants and products.
Consider the general reaction,
One mole of
(d)

Answer to Problem 12.128P
The moles of
Explanation of Solution
The formula to calculate the moles of
Substitute
The number of moles of water required by one mole of wafer is
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Chapter 12 Solutions
Chemistry: The Molecular Nature of Matter and Change
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