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  • The solved tasks turn into coordinates
  • The chance to follow your progress
  • Along with your schoolmates and friends, go on an adventure, searching for hideouts
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315.1. Air composition and usage(reactions).

Type in the missing word!

At the beginning of the 20th century airships were filled with hydrogen, but for the safety the H2 were replaced with .

Write the equation of the reaction, that shows the reason, why hydrogen airships were not safe!

Air and its quality.
Air composition and usage(reactions).

Solve tasks to find hidden Geo point coordinates

  1. Algebra: Periodical decimal fractions.
  2. Geometry: Circle in a triangle, centers location.
  3. Algebra: Fraction addition and subtraction.
  4. Algebra: Equation with unknown denominator.
  5. Geometry: Parallelogram, elements. Properties and signs.
  6. Algebra: Equation with unknown denominator.
  7. Algebra: Proportions, percent
  8. Physics: Heat process diagram.
  9. Physics: Heat expanding.
  10. Geometry: Diameter, which is perpendicular to chord, properties.