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5000 BCE
When metals where discovered
It is believed that copper was the first metal obtained by the year five thousand a.de.c . However, this metal is soft, and many years depues found that the adhesion of another, tin, toughen it. The result of hard metal copper-tin alloy is bronze, which spread then from Mesopotamia to China, where its use reached the peak around the year 1500 a.de.c. At the same time began to generalize the use of iron near the Black Sea, reaching its peak in India, around the year thousand a.de.c. -
2000 BCE
From classical Greece to Lavoisier
With the progress made in the first civilizations, man disposed of empirical knowledge and descriptions of phenomena that would mean the emergence of a higher stage, in which the questioning of the observed facts would be close to what we now call the "logical rationing" -
Apr 5, 1200
The Alchemy, A large age
Tt seems to begin in Egypt .Among the IV and V centuries, immigrants brought their knowledge to the Arabs. Between the eighth and eleventh centuries it reached a remarkable development of science in this region. Knowledge of Arab alchemists were brought to Europe between the eleventh and sixteenth centuries, through Sicily and Spain.
The greatest contribution of the alchemists is the equipment and laboratory equipment, experimental techniques and methods for preparing many chemical species. -
composition of matter and the 4 elements
For Thales matter it was composed of water; for Amaximenes air; for Heraclitus of Ephesus by fire. But it was Agriento Empedocles of Sicily, who postulated the theory of the four elements: earth, air, water and fire, which would consist of tiny particles. This doctrine was enriched by Aristotle Stagira and was effective, thanks to its great prestige, until the sixteenth century, and only partially to the eighteenth century. -
Robert Boyle: the skeptic chemist who dethroned Aristotle
Posit that the progress of true science is based on the accumulation of experimental evidence to substantiate the concepts and terms. With Boyle defining element passes field of metaphysical speculation to experimental.
Despite his great contribution, he believed the fire had weight, even though at the time some experiments gave John Mayow lights on the combustion process. -
Iatrochemistry: Chemical raid in Medicine
It is characterized by the introduction of chemicals in medical practice, with the first driver to Paracelsus. He states that the purpose of chemistry is not to produce gold, but to discover drugs. I occupy to cure disease drugs metallic origin and opium.
Among his supporters they stand out Andreas Libavius and Baptist van Helmont. -
The beginnings of modern chemistry
It is considered to Antoine Laurent Lavoisier as the founder of modern chemistry. His contributions in addition to chemistry, covering multiple areas.
Lavoisier realized that gases could be generated in a chemical reaction or chemically recombine. He showed that the mass of all substances contained in the container is the same before and after the reaction occurs, even if the material experiences changes shape. -
Chemistry of Today
One could postulate that the alchemists were the ones who opened the way to "Chemistry Today" in many procedures performed. They created various experimental techniques and discovered a wide variety of substances. Outside, they have the merit of being the first who sought the source of conocimiento.Con this approach, reasoning and experience the chemistry has a new way to interpret the phenomena occurring around us in the experiments. -
Conservation of mass
This law proposed by Lavoisier says that regardless of the change to which we subject matter, its mass always remains the same.
For Dalton, this law can be explained on the basis of atomic theory: "If the atoms have definite masses can not be divided or destroyed, then in a chemical change, simply rearrange atoms; thus, the total mass must be the same before and after the chemical reaction " -
The begining of Chemistry
Since the fire was discovered, various cultures have used in multiple uses, but in technological progress, an important milestone use of fire is the heat source for obtaining metals.
