- Definition of H
Hydrogen (symbol H) is a chemical element with atomic number 1 on the periodic table. Hydrogen is the lightest chemical atom, accounting for the majority of the total number of atoms in the universe.
1.1 Names
1.1.1 Common name: Hydrogen
1.1.2 English name: Hydrogen
1.2. Atomic mass: 1.00794 u
1.3. Atomic weight: 1.00784 u
1.3.1 Molecular structure: H2
1.4 Ion structure: H+
- Properties: H
2.1 Physical properties of H
State: Gas
Color: Colorless
Smell: Odorless
PH level: 7 (when in H2 form)
2.2 Chemical properties of H: Hydrogen has the ability to combine with many other elements such as O, N, Cl, S, Br…
- Common Chemical Reactions for H
Metal reaction: 2Na + 2H2O -> 2NaOH + H2
Acid reaction: H2 + Cl2 -> 2HCl
Non-metal reaction: H2 + O2 -> 2H2O
Reaction with salt: H2 + NaCl -> 2Na + 2HCl - Preparation of H
4.1 Laboratory preparation of H:
Zn + H2SO4 -> ZnSO4 + H2
4.2 Industrial preparation of H:
CH4 + H2O -> CO + 3H2
CO + H2O -> CO2 + H2.