Free Science Videos and Lectures

Since sodium reacts slower than other alkali metals, the reaction is so intense. It just burns for a while.

This video was done by University of Oxford.

This science video contains:
burning, chlorine, reaction, fire, alkali, sodium

Sodium is a chemical element which has the symbol Na (Latin: natrium), atomic number 11, atomic mass 22.9898 g/mol, oxidation number +1.

Sodium is a soft, silvery white, highly reactive element...

This science video contains:
explosion, water, burning, reaction, fire, alkali, sodium, na

Watch how a "marshmallow" is made using just a few chemical elements.

First we take hydrogen preoxide, then we add liquid soup, we mix it together and finally add a little of potassium iodide and...

This science video contains:
reaction, marshmallow, marsh mallow, hydrogen peroxide, liquid soup, potassium iodide

A piece of heated potassium is placed in chlorine. The reaction is violent and instantaneous which causes it to burn.

This science video contains:
chlorine, reaction, fire, potassium, cl

Potassium is a chemical element. It has the symbol K (Latin: kalium) and atomic number 19.
The name "potassium" comes from the word "potash", as potassium was first isolated from potash.
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This science video contains:
water, sparks, reaction, fire, potassium, alkali