Israel Parada (Licentiate,Professor ULA)

(Licenciado en Química) - AUTOR. Profesor universitario de Química. Divulgador científico.

Science

How to Convert Kelvin Temperatures to Celsius

Knowing how to convert Kelvin to Celsius is just as important as knowing how to do the reverse conversion. Many physicochemical properties of matter...

Chemistry

20 examples of chemical elements

Chemical elements are defined as pure substances that cannot be broken down into other simpler substances by either physical or chemical means. This means...

Linguistics

What is a grapheme?

In simple words, a grapheme is any letter of the alphabet of a language. It corresponds to the minimum writing unit of any language...

Science

What is a laboratory report and how is it written?

A laboratory report , sometimes also called an experiment report , consists of a written document that presents, in a systematic and organized way,...

Chemistry

What is a mineral acid? – Definition and list

A mineral acid, also called an inorganic acid, is any protic acid (which releases hydrogen ions, that is, protons in aqueous solution) derived from...

Chemistry

How to Make an Acidic Aqua Regia Solution

Aqua regia is a strongly oxidizing mixture prepared by mixing two strong concentrated mineral acids, namely concentrated hydrochloric acid (HCl) and concentrated nitric acid...

Chemistry

How to make homemade tattoo ink from natural ingredients

Homemade tattoo inks are often associated with crude prison tattoos. On the other hand, they are also associated with the traditional tattoos of some...

Science

What does LD50 mean?

LD50 is a term used to represent Median Lethal Dose, which is defined as the amount of a chemical required to kill 50% of...

History and culture

Timeline of Hellenistic Greece

The period of Hellenistic Greece refers to the period of ancient Greek history from the death of Alexander the Great in the late 4th...

biology

Defense Mechanisms: How Animals Avoid Becoming Prey

Defense mechanisms are a series of adaptations, including organs, that some animals have and that allow them to avoid being hunted by their predators....

Science

How to Convert Fahrenheit to Celsius

The Fahrenheit scale is, along with the Celsius or centigrade scale, one of the most widely used temperature scales. It is the quintessential temperature...

History and culture

All about the Inca Sun God Apu Inti

The Sun has been revered by countless civilizations throughout human history. This is not at all surprising, considering that, in addition to being the...

Statistics

Confidence intervals for the difference of two population proportions

Confidence intervals (CI) are used in inferential statistics as a tool to estimate the value of a population parameter. These provide a greater amount...

Physical

Boiling point definition

The boiling point of a substance is defined as the temperature at which the vapor pressure in equilibrium with said substance in a liquid...

Chemistry

How to purify alcohol by distillation

Ethyl alcohol is one of the most widely used organic chemical compounds in the laboratory. Furthermore, it is one of the few alcohols that...

Physical

Formulas to find the moment of inertia

The rotational moment of inertia or, simply, the rotational inertia, is a scalar physical quantity typical of any object that has mass, and that...

geology

Map of tectonic plates and their boundaries

There is ample scientific evidence confirming that the earth's surface did not always look like it does today. For more than three billion years,...

Chemistry

Covalent Bond Definition

A covalent bond is a type of chemical bond in which two atoms of the same or different elements share one or more pairs...

Chemistry

Definition of mixture in chemistry

In chemistry, a mixture is a material formed by two or more different chemical substances that, when mixed, do not lose their respective identities....

Science

Why do more people drown in fresh water than in salt water?

According to statistics from the World Health Organization, death by drowning is the third leading cause of accidental or unintentional death worldwide. 7% of...

Chemistry

Practical list of halogen elements

The halogens are a group of five to six non-metallic elements found in group 19 of the periodic table (formerly group VIIA). It consists...

Science

Biography of Robert Hooke, discoverer of cells

Robert Hooke was a versatile British scientist and architect who made numerous contributions to both science and engineering, as well as many other fields...

History and culture

The McCulloch v. Maryland case

The McCulloch v. Maryland case was a very important court case in the legal history of the United States. This is a lawsuit filed...

History and culture

9 Things You Didn’t Know About Quetzalcoatl

Quetzalcóatl is one of the most important deities of pre-Columbian Mesoamerica. She is part of the religion and worldview of many of the ancient...

Chemistry

Relative size of atoms of chemical elements

The size is an important characteristic of the atoms that make up the different elements present in the periodic table. It allows us to...

issues

The disappearance of Miranda Gaddis

Miranda Gaddis was a 13-year-old girl who disappeared in 2002 in the city of Oregon, in the state of Oregon (United States). Later, it...

History and culture

The lives and crimes of the infamous female convicts on California’s death row

In the state of California there are a total of 24 women awaiting capital punishment, some for more than 32 years, while the most...

Statistics

Example of calculating the population standard deviation

The population standard deviation is one of the most important population parameters for measuring the variability or dispersion of data within the population. Like...

Chemistry

How to convert grams to moles and vice versa

The concept of the mole is closely linked to all aspects of chemistry. It is a measure of the amount of matter and is...

Chemistry

Ten Examples of Chemical Changes We Experience Every Day

We live in a world made up of an innumerable number of constantly moving atoms, ions and molecules that constantly collide with each other,...

History and culture

Vega – Origin and meaning of the surname

The surname Vega is a toponymic surname, that is, a surname that refers to a place. This surname comes from the Spanish word vega,...

Statistics

The slope of the regression line and the correlation coefficient

When statistically analyzing series of quantitative data, we are often faced with paired data or ordered pairs. These correspond to data of two different...

Science

Five Ways to Differentiate Density from Specific Gravity

Density and specific gravity are two properties of matter that have many similarities, but also some differences. To begin with, both are intensive properties...

Chemistry

What are farts made of?

Regardless of whether we hate it or find it very funny, farting from the intestine, commonly called "farting", is part of our lives. They...

Chemistry

Should you add acid to the water?

Acid solutions, especially those of some strong acids such as sulfuric and nitric acids, are among the most widely used solutions in the laboratory...

Geography

Intersection between the 0 meridian and the equator

There is something magical in the cartographic perfection of the intersections between the imaginary lines that form the degrees of latitude and those that...

Science

Differences between mass and volume

Mass and volume are two properties of matter that are closely linked to each other. Both are extensive properties that depend on the size...

Education

Interview Questions for Teachers and Professors and Suggested Answers

The interview is one of the most important stages in the process of recruiting candidates for a job position in any organization, including educational...

biology

What is stabilizing selection in evolution?

Stabilizing selection is one of the five main types of selection that drive the evolution and adaptation of species to their environment. It is...

Languages

Commands to a dog in German (“Hundekommandos”)

Everyone who has ever had a pet dog has dreamed of training it. There is something magical about observing the intelligence of man's best...

Math

Differences between extrapolation and interpolation

When carrying out different types of calculations, whether in science or engineering, it is very common to resort to experimental data that we find...

History and culture

the cuban revolution

The Cuban Revolution is of great importance from the point of view of universal history. It represents one of the last strongholds of Soviet...

biology

Definition and Examples of Primary Succession

Primary succession is a type of ecological succession that consists of the colonization of a previously uninhabited, sterile, or lifeless region. In other words,...

Spanish

40 basketball terms in Spanish

Basketball, also called in some cases "basketball", "basketball" or basketball (the corresponding term in English), is a sport played all over the world and...

History and culture

The family tree of the gods of Olympus

The gods of Mount Olympus, or Olympian gods as they are often called, are a group of gods from Greek mythology who ruled from...

Science

Safety signs in the science lab

Whether it's a teaching lab at an educational institution or a research and development lab at a transnational organization, working in a science lab...

Japanese