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Beating mercury heart

Beating mercury heart. Balázs Végh Jurisich Miklós High School KŐSZEG. A szív képét javasoljuk ide. 70 times a minute 100,000 times a day 3 billion times within 75 years. Mercury heart. Chemistry Physics Fun. Substances. sulphuric acid solution (H 2 SO 4 )

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Beating mercury heart

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  1. Beating mercury heart Balázs Végh Jurisich Miklós High School KŐSZEG

  2. A szív képét javasoljuk ide • 70 times a minute • 100,000 times a day • 3 billion times within 75 years

  3. Mercury heart Chemistry Physics Fun

  4. Substances • sulphuric acid solution (H2SO4) • potassium-dichromate solution (K2Cr2O7) • mercury (Hg) Apparatus • a needle or nail • watch-glass • overhead projector (OHP)

  5. Procedure of experiment drop of mercury on the watch-glass just barely reaches the drop it’s taking triangular and spherical shapes by turns drop is at rest

  6. Explanation I. • The shape of the drop is determined by the surface charge. • Increase of surface tension  decrease of surface  drop contracts • Large surface charge  small surface tension  drop goes flat

  7. Explanation II. • mercury atoms are oxidized: 6 Hg+Cr2O72-+14 H+=3 Hg22++2 Cr3++7 H2O • H2SO4 oxidizes the iron: Fe+2 H+=Fe2++H2 • or the dichromate ion oxidizes both the iron and iron ions: Cr2O72-+2 Fe+14 H+=2 Cr3++2 Fe3++7 H2O resp.: 6 Fe2++Cr2O72-+14 H+=6 Fe3++2 Cr3++7 H2O

  8. Explanation III. • reactions take place very quickly  needle becomes negatively charged • mercury gains electrones from the needle • Hg22+ ions are reduced to metallic mercury • mercury and iron are reoxidized  the process starts from the beginning • periodic increase and decrease of the drop

  9. The mercury vibrates • Stoppes quickly after one touch – looses energy (damped vibration) • Each contact provides energy - periodically • foutside = fnatural  RESONANCE • Within the mercury stationary waves are produced

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