CHALK BASICS

This is the chemical formula for Chalk. Calcium (with two less electrons) bonded with carbon and three oxygen atoms (with two more electrons). (Devon Goldhammer,Unknown)

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This is the molecular structure of CaCO3 or chalk. Each molecule contains a calcium atom (black), carbon atom (green), and three oxygen atoms. (WiseGEEK,2003-14)

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Physical properties of chalk:

• Appearance: Soft solid that easily breaks down in to powdery dust. 
• Colour: Primarily white or colourless crystals. With dye, it can be any colour.
• Odor- Nothing notable.
• Taste- Nothing notable, however in your mouth it becomes like mushy sand. Not recommended for eating purposes. 

(R.N. Mortimore, 2004)

Chemical properties of chalk

• No rapid reactions with with air or water.

• Not toxic.
• Not flammable or combustible.
• Decomposes at 825 degrees Celsius into carbon dioxide and calcium oxide.
• Very basic and stable. 

(CAMEOChemicals, 2012)