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Molecular Orbital Theory

The Lewis structures, the VSEPR theory and the valence binding method form a powerful combination to describe covalent bonding and molecular structures. The results are satisfactory for most of our purposes. However, sometimes, chemists need […]

Carlos Moreno   General
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Probability

We often use the word “probability“ in ordinary language; so, for example: “It is likely that tomorrow can not come”    When we say these kinds of sentences, we want to express that we are […]

Carlos Moreno   MATHEMATICS EXERCICES
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Elasticity and Fracture

When an object is at rest, we can think that it is not interesting to study because it does not have speed or acceleration and because the forces which are acting on it are zero. […]

Carlos Moreno   Mechanics
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Solubility and Precipitation

The amount of solute, usually expressed in grams, that dissolves in a certain amount of solvent (usually 100 g), to obtain a saturated solution, is called solubility.    It is said that a body is […]

Carlos Moreno   General
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Force and Pressure in Fluids

The three common states, or phases, of matter, are solid, liquid, and gaseous. The solid maintains a fixed shape and size; even when a large force is applied, a solid will not change easily in […]

Carlos Moreno   PHYSICS EXERCICES
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Successions

A succession is an ordered sequence of numbers, such as: A succession of real numbers is an application of the set N (set of natural number excluding zero) in the set R of the real […]

Carlos Moreno   MATHEMATICS EXERCICES
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Pure substances and mixtures

Matter is made up of tiny units called atoms. We currently know that there are 119 different types of atoms, which are the basis of the 119 elements of the periodic table (including “unnunennio” which […]

Carlos Moreno   CHEMISTRY EXERCICES
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Collisions

When two or more bodies approach each other, internal forces act between them, causing a variation in their linear momentum and in their energy, producing an exchange between them of both magnitudes. In this case, […]

Carlos Moreno   Mechanics
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The chemistry of carbon

Since its beginnings in the 18th and 19th centuries, chemistry has been divided into two main branches: organic chemistry and inorganic chemistry. Organic Chemistry: It was associated with the chemistry of living beings and the […]

Carlos Moreno   Descriptive . Organic
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REAL AND COMPLEX NUMBERS

The union of racional and irracional numbers forms a set called real numbers. If we remember the different types of numerical sets, we see that we have: Rational numbers also contain integers numbers that have […]

Carlos Moreno   MATHEMATICS EXERCICES
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