Hydrogen S block element

Hydrogen was discovered by _______

The by the addition of ____ to ____

Reaction _____________

Henry Cavendish 1766

HCl to Zinc

HCl (aq) + Zn (s) → ZnCl2 (aq) + H2 (g)

Hydrogen fuel

H2 (g) + O2 (gas) → H2O

H2 gas boiling point?

Ideal fuel

Highly negative delta H (enthalpy) = exothermic and release of heat.

Bp= - 253 C (20K)

Hydrogen

What block?

Solid liquid or gas?

Does it react with H2O?

Alkali metal?

S block

Gas

Not reactive with H2O

No far more electronegative than alkali metals in S block

Electrolysis of H2O