Andrey Solovyev

Carboxylic acids and esters are one of the most important classes of organic compounds. They are eve

Guess all 59 US National Parks either by its photo or on the map.Yosemite, Grand Canyon, Yellowstone

Learn names and formulas of all important inorganic acids, polyatomic ions and their salts. An app i

This application is for students studying organic chemistry, for teachers and organic chemists. Ther

This application is a perfect app to learn 24 Greek letters and alphabet: from Alpha to Omega. You c

Learn all 48 ceremonial (geographic) Counties of England: from Northumberland to Cornwall, from Grea

Learn about all 31 States of Mexico: from Baja California Sur to Yucatan. + Mexico City (former the

All 44 US Presidents in one app including current president Donald Trump who is serving as the 45th

Learn all 81 provinces of Turkey: from Istanbul and Ankara to Erzurum and Van.There are 4 different

Learn all 12 Provinces of the Netherlands (from Friesland to Zeeland) and 3 Public bodies in the Car