Understanding Materials, Atoms, and Chemical Processes
Material Classification
Materials are classified according to their source (natural materials, manufactured materials, or newly created) or according to their properties (metals and metal alloys, polymers, ceramics).
Manufacturing Processes
Manufacturing involves materials that have undergone a change or were obtained from a chemical process. Some materials are transformed without altering their chemical composition, while others are newly created.
Natural Materials
Natural materials are obtained from
Read MorePharmaceutical Compounds & Analytical Chemistry Essentials
Volumetric Analysis Fundamentals
Volumetric analysis is a method of quantitative chemical analysis where the amounts of substances are determined by measuring the volume they occupy in different proportions.
Types of Volumetric Methods
Volumetric methods are classified into types based on the reactions involved:
- Neutralization Titration
- Non-aqueous Titration
- Redox Titration
- Complexometric Titration
- Precipitation Titration
Neutralization Titration
Also known as acid-base titration in the aqueous phase, this
Read MoreOrganic Chemistry Reactions: Oxidation & Alcohol Transformations
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Question 1
Which one of the following statements does not describe an oxidation?
Correct Answer: Addition of a hydride ion
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Question 2
Which sequence shows the correct ordering with regard to an increase in the oxidation state for the oxidation of methanol?
Correct Answer: Methanol < Formaldehyde < Formic Acid < Carbon Dioxide
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Question 3
Which is the correct formula for sodium dichromate?
Correct Answer: Na2Cr2O7
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Question 4
Oxidations with chromic acid can easily be monitored since the oxidized
Atomic Models, Quantum Theory, and the Periodic Table
Thomson Model of the Atom
In the Thomson model, electrons (e-) are embedded in a sphere of uniform positive charge, like plums in a pudding. There is no distinct nucleus.
Rutherford’s Nuclear Model
The Rutherford model proposes a nucleus that is very small in comparison with the volume of the atom. This nucleus contains almost the entire mass of the atom and all of its positive charge. Electrons form a “crust” (electron cloud) spinning around the nucleus and are relatively far from it.
The Neutron:
Read MoreChemical Nomenclature: Naming Inorganic Compounds
Binary Salts: Definition and Nomenclature
Binary salts are inorganic compounds composed of two different elements, typically a metal and a nonmetal. When the nonmetal is a halogen, these compounds are specifically called halides. They can be considered the result of replacing the hydrogen (H) in a hydracid with a metal.
This general reaction illustrates their formation:
Acid + Base → Salt + Water (H2O)
In this context, the acid is typically a hydracid, the base is a hydroxide, and the resulting compound
Read MoreNanomaterial Fabrication, Imaging, and Drug Delivery Applications
Chemical Vapor Deposition (CVD) Fundamentals
Chemical vapor deposition (CVD), a hybrid method using chemicals in the vapor phase, is conventionally used to obtain coatings of a variety of inorganic or organic materials. It is widely used in industry because of relatively simple instrumentation, ease of processing, the possibility of depositing different types of materials, and economical viability. Under certain deposition conditions, nanocrystalline films or single crystalline films are possible.
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