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Florencia Acevedo.

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Presentation on theme: "Florencia Acevedo."— Presentation transcript:

1 Florencia Acevedo

2 History Theophrastus Paracelsus, Turquet De Mayerne, Robert Boyle, and Henry Cavendish all found the element but never labeled it as Hydrogen. Finally in 1783 Lavoisier named the element. The name Hydrogen comes from the Greek “hydro” meaning water and “genes” meaning forming. Hydrogen got its chemical symbol by taking the first letter of its name.

3 Forms and uses Hydrogen is use in welding, for the hydrogenation of fats and oils, in methanol production, in hydro dealkylation, hydro cracking, and hydro desulfurization. A form of Hydrogen is at room temperature hydrogen which is a gas.

4 Facts on hydrogen It is the lightest element.
It is by far the most abundant element in the universe and makes up about 90% of the universe by weight. Hydrogen gas was used in lighter-than-air balloons for transport but is far too dangerous because of the fire risk (Hindenburg). It is composed of a single proton and single electron. It is estimated that 90% of the visible universe is composed of hydrogen.

5 Chemical Properties Hydrogen gas is extremely flammable.
It reacts with other elements by combining with them. It is a colorless, odorless, tasteless gas.

6 Physical Properties Melting Point: 13.81 K (-259.34°C or -434.81°F).
Boiling Point: K ( °C or °F). Density: grams per cubic centimeter. Phase at Room Temperature: Gas.

7 Where is hydrogen found?
Hydrogen is found in the nonmetal group on the periodic table. It is also found in the stars. It is man-made. It is found only in compound form with other elements. Hydrogen gas is so much lighter than air, that it rises fast and is quickly ejected from the atmosphere. This is why hydrogen as a gas is not found by itself on Earth.

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