Home » eggshells

Calcium project – Chalk and lemon juice – Chemistry

By |2018-04-16T17:38:03-08:00June 1st, 2017|Chemistry|

Need chalk? Buy chalk Take a piece of regular white chalk, like for writing on a blackboard. Make sure the chalk is calcium carbonate like the kind in the picture and not made of plaster of paris. Drop the chalk in a cup of vinegar or lemon juice. Vinegar is made of water [...]

Calcium – Atoms and Chemistry

By |2018-04-16T14:37:53-08:00June 1st, 2017|Biology, Chemistry|

Chalk cliff (made of calcium) in Cottonwood Canyon, Pueblo, Colorado When a star is on the way to converting all of its carbon and oxygen atoms into iron, calcium is one kind of atom it makes along the way. One atom of calcium has 20 protons and 20 electrons (and 20 neutrons). Calcium is a [...]