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Melanie Bondoc

on 10 May 2010

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Transcript of Hydrogen

Melanie Bondoc, Olivia Bird, Isabella Daher
8th Grade
Period 6
Date Presenting: May 6, 2010

H Atomic Number: 1

Atomic Mass: 1.0

Classification: Nonmetal

Group: No Group because its properties do not match the properties of any other group. Its properties are more like nonmetals, but it is placed above the alkali metals because alkali metals also have only 1 electron on their outer level. Discovered in 1766

Place Discovered: London, England

How discovered: Henry evolved hydrogen gas by reacting zinc metal with hydrochloric acid. In a demonstration to the Royal Society of London, Cavendish applied a spark to hydrogen gas yielding water.

Discovered the Element: Henry Cavendish (1731-1810)

Common uses in history:
•Jacques Alexander Cesar Charles, a French physicist, launched the first hydrogen balloon flight (1783).
•Sir William Grove, an English scientist and judge, demon¬strated Schoenbein’s discovery on a practical scale by creating a “gas battery.” (1845)

Where could you find it in that time: Water and hot air balloons
Physical Properties:
•Highly flammable
•Lighter than air
•Pure hydrogen is a gas under normal circumstances
•The gas mixes well with air
•Very explosive
Chemical Properties:
•Reacts easily with other chemical substances
•But it doesn’t usually react with other chemicals at room temperature
•Reacts with oxygen to form water
•In extreme pressure, hydrogen can act like a metal
•Heating may cause violent combustion or explosion
•Widely used as a reducing agent
Uses: In balloons and metal refining

Obtained from: Mines, oil, or gas wells

Mixed with other elements to make new substances?: Yes, two Hydrogen atoms and one Oxygen atom mixed together to make water (H2O) Interesting facts about Hydrogen:
-Hydrogen is the most abundant chemical element in the universe, consisting of about 75% the universe's elemental mass.
-Hydrogen provided the lift for the first reliable form of air tavel, used in the airship, invented by Henri Giffard, which evolved into airships, most notably the Zepplin.
-Hydrogen is essential in the fusion reactions of stars, in both the proton-proton reaction and the CNO cycle

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