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Beating mercury heart

Explore the intriguing experiment revealing chemical reactions involving mercury, sulphuric acid, and potassium dichromate, showcasing physics concepts like resonance and vibration. Understand the dynamic shapes, charge interactions, and constant transformations within the Mercury Heart experiment. Witness science in action!

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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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