Les references
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http://en.wikipedia.org/wiki/Household_hazardous_waste
http://en.wikipedia.org/wiki/Matter#Definition
http://education.jlab.org/beamsactivity/6thgrade/whatismatter/whatismatter.pdf
http://en.wikipedia.org/wiki/Atomic_theory
http://www.preservearticles.com/201012281846/modern-atomic-theory.html
http://chemistry.about.com/od/chemistryglossary/a/isotopedef.htm
http://en.wikipedia.org/wiki/Chemical_substance#Definition
https://everythingscience.co.za/grade-10/02-classification-of-matter/02-classification-of-matter-02.cnxmlplus
http://www.edinformatics.com/math_science/solutions.htm
http://en.wikipedia.org/wiki/Solution
https://osha.europa.eu/en/faq/construction-solvents/what-are-organic-solvents
http://www.chem4kids.com/files/atom_ions.html
http://science.howstuffworks.com/dictionary/chemistry-terms/solution-info.htm
http://www.stevespanglerscience.com/lab/experiments/instant-hot-ice
http://chemistry.about.com/od/lecturenotesl3/a/concentration.htm
http://www.sciencefairadventure.com/Speed_of_Dissolving.aspx
http://www.diffen.com/difference/Covalent_Bonds_vs_Ionic_Bonds
http://preparatorychemistry.com/Bishop_supersaturated.htm
http://www.britannica.com/EBchecked/topic/279025/hydrosphere
http://www.thenakedscientists.com/HTML/news/news/582/
http://en.wikipedia.org/wiki/Water_fluoridation
199px-Teilchenmodell_Fluessigkeit.svg.png
http://en.wikipedia.org/wiki/Household_hazardous_waste
http://en.wikipedia.org/wiki/Matter#Definition
http://education.jlab.org/beamsactivity/6thgrade/whatismatter/whatismatter.pdf
http://en.wikipedia.org/wiki/Atomic_theory
http://www.preservearticles.com/201012281846/modern-atomic-theory.html
http://chemistry.about.com/od/chemistryglossary/a/isotopedef.htm
http://en.wikipedia.org/wiki/Chemical_substance#Definition
https://everythingscience.co.za/grade-10/02-classification-of-matter/02-classification-of-matter-02.cnxmlplus
http://www.edinformatics.com/math_science/solutions.htm
http://en.wikipedia.org/wiki/Solution
https://osha.europa.eu/en/faq/construction-solvents/what-are-organic-solvents
http://www.chem4kids.com/files/atom_ions.html
http://science.howstuffworks.com/dictionary/chemistry-terms/solution-info.htm
http://www.stevespanglerscience.com/lab/experiments/instant-hot-ice
http://chemistry.about.com/od/lecturenotesl3/a/concentration.htm
http://www.sciencefairadventure.com/Speed_of_Dissolving.aspx
http://www.diffen.com/difference/Covalent_Bonds_vs_Ionic_Bonds
http://preparatorychemistry.com/Bishop_supersaturated.htm
http://www.britannica.com/EBchecked/topic/279025/hydrosphere
http://www.thenakedscientists.com/HTML/news/news/582/
http://en.wikipedia.org/wiki/Water_fluoridation