Notes, summaries, assignments, exams, and exercises for Chemistry for Baccalaureate

Atomic Orbitals, Quantum Numbers and Bonding Properties

Orbital is the region of space around the nucleus in which there is a high probability of finding an electron with a given energy.

Quantum numbers

The quantum numbers describe the allowed states of an electron in an atom:

• Principal quantum number (n): n takes positive integer values (1, 2, 3, ...) and is related to the size and energy of the orbital.
• Azimuthal (orbital) quantum number (l): l takes integer values from 0 to n−1 and is related to the orbital angular momentum and the shape and energy of the orbital.
• Magnetic quantum number (m_l): m_l takes integer values from −l to +l and is related to the orientation of the orbital in space.
• Spin quantum number (m_s): m_s can be +½ or −½ and

Industrial Applications of Electrolysis

Electrolytic processes have significant applications in the industrial field. Some of these include:

• The acquisition of active metals.
• Metallic coatings.
• The purification of metals.

Metallic Coatings

Through electrolysis, it is possible to deposit a thin layer of metal onto another metal. This process is called electroplating and has many applications, including:

• Gold and silver coatings: Used for the aesthetic beautification of various objects.
• Zinc, nickel, chromium, and copper coatings: Designed to provide protection for metal objects against corrosion.

In zinc coating (galvanization), the electrolyte is a salt of the metal, the anode is formed by a pure zinc bar, and the cathode is the workpiece to be coated....

Fundamentals of Solid-Liquid Extraction

Key Applications in Various Industries

• Extraction of sugar from sugar beets
• Coffee decaffeination
• Extraction of essential oils from herbs and botanicals
• Recovery of oils from seeds and other materials
• Obtaining pectin (for jelly) from fruit fractions

Commonly Used Solvents

• Water
• Hexane
• Heptane
• Ether
• Chloroform
• Benzene
• Ethanol

Industrial Extractor Equipment Designs

Static Bed Extractors

These extractors operate with a stationary solid bed through which the solvent passes.

Simple Contact Extractors

These operate discontinuously and are simple in design. They consist of a double-bottom tank where the solid material is placed. A liquid solvent is sprayed over the solid and percolates through it by gravity. The solvent, now...

Covalent Molecular vs. Atomic Covalent Solids

Covalent molecular substances are linked together by intermolecular forces, which are generally weak. Consequently, molecular substances are usually gases or liquids at Standard Temperature and Pressure (STP). In contrast, in atomic covalent solids such as diamond or silica, the molecules are linked together by covalent bonds. These bonds are very strong, resulting in greater cohesion between the molecules; therefore, they are solid at STP.

Molecular substances have low boiling temperatures because small thermal agitation can break the intermolecular bonds. However, covalent solids are much stronger; they only melt or boil at very high temperatures because these links offer strong resistance to being...

Characteristics of Lipids and Fats

Lipids are a very heterogeneous group of chemicals, both from a structural point of view and regarding the functions they perform. They are primarily composed of carbon, hydrogen, and oxygen, though the latter is usually present in very low proportions. Some lipids also contain phosphorus, nitrogen, and sulfur. Lipids are a group of organic biomolecules that satisfy two distinguishing characteristics: they are insoluble in water and other polar solvents, and they are soluble in organic solvents (i.e., non-polar solvents such as gasoline or benzene).

Molecular Structure of Fatty Acids

Fatty acids are molecules composed of long aliphatic hydrocarbon chains. These are linear chains with an even number of carbon...

Fundamental Chemical Substances: Elements and Compounds

Defining Simple Substances: Elements

Simple substances, or elements, are the basic building blocks of matter. They combine in fixed proportions by mass to form compounds.

Classification of Elements

• Metallic Elements

  Located on the left side of the periodic table. All are solids at room temperature, except mercury (Hg), which is a liquid with a melting point of -39 °C.

• Nonmetals

  Found on the right side of the periodic table. Examples include carbon (C), nitrogen (N), phosphorus (P), oxygen (O), sulfur (S), selenium (Se), and the halogens: fluorine (F), chlorine (Cl), bromine (Br), and iodine (I). They exist in various physical states; for instance, sulfur is solid, chlorine is gaseous, and bromine

Fundamental Particle Properties

• Mass of Electron ($m_e$): $9.109534 \times 10^{-31}$ kg
• Charge of Electron ($q_e$): $-1.602189 \times 10^{-19}$ C
• Mass of Proton ($m_p$): $1.672649 \times 10^{-27}$ kg
• Charge of Proton ($q_p$): $1.602189 \times 10^{-19}$ C
• Mass of Neutron ($m_n$): $1.674954 \times 10^{-27}$ kg

Rays/channels are formed by positively charged particles. The relationship between charge and mass varies according to the gas used in the tube.

Quantum Numbers and Orbitals

Quantum numbers describe the state of an electron:

• Principal Quantum Number ($n$): Energy level
• Orbital Angular Momentum ($l$): Orbital shape (ranges from 0 to $n-1$)
• Magnetic Quantum Number ($m_l$): Orbital orientation
• Spin Quantum Number ($m_s$): Electron spin ($\pm 1/2$)

The...

Nouns: Morphological, Semantic, and Syntactic Analysis

From a morphological perspective, nouns are characterized by their own gender and number. They support derivation and composition. From a semantic point of view, nouns refer to entities that possess a distinct way of life. From a syntactic standpoint, nouns function as the core of noun phrases, performing roles such as subject, direct object, and indirect object.

Classification of Nouns

• Common Nouns: Words for realities that form classes.
• Proper Nouns: Words used to identify and refer to individual beings.
• Concrete Nouns: Realities that can be perceived by any of our senses.
• Abstract Nouns: Concepts not perceived by the senses, but only by the mind.
• Collective Nouns: Singular sets consisting of

Conventional Thermal Power Plant Operation

Electric power is generated from the heat produced by the combustion of coal or natural gas fuel.

Core Components of the Thermoelectric Cycle

There are many types of boilers. The most commonly used are radiation boilers, so named because the heat energy is primarily transmitted by radiation.

Boiler Structure and Function

Boilers have a burner appropriate for the type of fuel used and a combustion chamber surrounded by innumerable tubes through which water circulates to vaporize.

Reheaters

Reheaters are parts of the boiler designed to eliminate water droplets accompanying the steam to convert it into dry steam.

Economizers and Preheaters

Economizers and preheaters harness the residual heat of the emitted combustion...

Capacitors

Definition

A capacitor is a device whose function is to store electrical charges for later use.

Types of Capacitors

Capacitors are divided into two groups: fixed and variable.

• Fixed capacitors: These include paper, ceramic, and electrolytic types. In paper capacitors, the plates are made of high-purity aluminum sheets and the dielectric is high-quality paper. In ceramic capacitors, the plates are silver and ceramic is used as the dielectric. In electrolytic capacitors, one plate is aluminum and the other is an electrolyte, using aluminum oxide as the dielectric.
• Variable capacitors: These are capacitors that can vary their capacity through mechanical means, using air or plastic as the dielectric.

Dielectric

Materials that do not conduct...