TEAM “RUEN” Vasilka Krasteva - supervisor Ivailo Nikolov - captain Bozhidar Popov

NUMBER 9TRAFFIC LIGHTS IN A TEST TUBE TEAM “RUEN” VasilkaKrasteva - supervisor IvailoNikolov - captain Bozhidar Popov David Stanislavov Mila Yordanova

PROBLEM • Volodya the fifth grader decided to collect as many liquids of various colors as possible in one tube. He succeeded to produce the “chemical traffic lights” as shown. Try to beat Volodya’s record

RESEARCH SOURCES • Oxidation of the indicators:- indigo carmine (solutions of NaOH and Glucose) - universal indicator pH (H₂SO₄, acetic acid, carbonated water, baking soda, ammonia solution, NaOH)

SOLUTION OF THE PROBLEM Staining of heterogeneous mixtures:

HETEROGENEOUS MIXTURES No coloring After coloring

First version Second version Third version

CONCLUSIONS • Each dye is dissolved in relevant substance • Pastry paints and blackberry stain water and alcohol. • Solid iodine can be dissolved in an alcohol and color it yellow - brown , and the liquid paraffin - in violet • In heterogeneous mixture substances form a colorful column

SOURCES PROGRAMS AND RESOURCES Office packet 2007 Paint Digital camera • www.youtube.com • www.google.BG • ГенджоваАлександрия. Лесни, интересни и безопасни опити по химия у дома. “Просвета – София” АД, 2011г.

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TEAM “RUEN” Vasilka Krasteva - supervisor Ivailo Nikolov - captain Bozhidar Popov