Water questions This is a list of recently added questions about water. Play water quiz and see all the questions. At what temperature does the water have the highest density?4°C (39.2°F). Increasing the temperature generally decreases the density, but water is a notable exception: the density of water increases between its melting point at 0 °C and 4 °C. Similar behavior is observed in silicon at low temperatures.Created by: Tschuka very hard 29% 0°C (32°F)0°C (32°F)1518100°C (212°F)100°C (212°F)738-273°C (-459.4°F)-273°C (-459.4°F)8994°C (39.2°F)4°C (39.2°F)1321numbers riddles » What ions are formed during self-ionization of water?H₃O + and OH-. The self-ionization of water is an ionization reaction in pure water or in an aqueous solution, in which a water molecule, H2O, deprotonates to become a hydroxide ion, OH−. The hydrogen nucleus, H+, immediately protonates another water molecule to form hydronium, H3O+. It is an example of autoprotolysis, and exemplifies the amphoteric nature of water. Created by: Tschuka very hard 30% H₃O + and OH-H₃O + and OH-199HO₂- and H₂OHO₂- and H₂O118OH + and H₃O-OH + and H₃O-100All answers are correctAll answers are correct230physics riddles » Where is the saltiest lake in the world?In Antarctica. With a salinity level of over 40%, Don Juan Pond is the saltiest of the Antarctic lakes. This salinity allows the pond to remain liquid even at temperatures as low as −50 °C (−58 °F) due to the interference of salts with the bonding of water molecules. Don Juan Pond was discovered in 1961 by George H. Meyer.Created by: Tschuka very hard 31% in Antarcticain Antarctica383In AustraliaIn Australia78in Israelin Israel546in Turkmenistanin Turkmenistan212salt riddles » What does synthesis gas (water gas) consist of?Carbon monoxide (CO) and hydrogen (H2). Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. Synthesis gas is a useful product, but requires careful handling due to its flammability and the risk of carbon monoxide poisoning. The water-gas shift reaction can be used to reduce the carbon monoxide while producing additional hydrogen, resulting in water gas. Created by: Tschuka very hard 21% oxygen (O2) and hydrogen (H2)oxygen (O2) and hydrogen (H2)669methane (CH4) and water (H2O)methane (CH4) and water (H2O)978carbon dioxide (CO2) and hydrogen (H2)carbon dioxide (CO2) and hydrogen (H2)730carbon monoxide (CO) and hydrogen (H2)carbon monoxide (CO) and hydrogen (H2)649alcohol riddles » How much percent of the water is in plasma?90%. Plasma, a component of blood, is an aqueous solution. In 90% it consists of water.Created by: Tschuka hard 52% 60%60%19670%70%30185%85%29590%90%859body riddles » Chemical formula of hydrogen peroxide is ...H₂O₂. Hydrogen peroxide is the simplest peroxide. In its pure form, it is a colourless liquid, slightly more viscous than water. It was first obtained by Louis Thénard in 1818 in the reaction of barium peroxide with nitric acid.Created by: Katarzyna Dąbrowskavery easy 86% CO₂CO₂223H₂O₂H₂O₂5012CH₄CH₄350H₂O₄H₂O₄216medicine riddles » How is the soilless cultivation of plants called?Hydroponics is a subset of hydroculture and is a method of growing plants using mineral nutrient solutions, in water, without soil. Terrestrial plants may be grown with their roots in the mineral nutrient solution only or in an inert medium, such as perlite or gravel.Created by: Paweł Kołodziejczykhard 52% hydrologyhydrology1873hydroculturehydroculture3842hydroponicshydroponics10933hydrofarminghydrofarming4340crops riddles » What part of the Earth's surface is dry land?29,2%. It is currenlty 29.2% - but it may decrease in the near future due to global warming and sea level rise.Created by: Krzysztof Moskalhard 54% 29,2%29,2%440733,6%33,6%227338,4%38,4%89642,1%42,1%479Earth riddles » In which country is the Plitvice Lakes National Park located?In Croatia. Plitvice Lakes National Park is a national park in Croatia. Since 1979 it is on a list of the UNESCO World Heritage list. The park consists of the system of 16 lakes connected by numerous waterfalls and cascades.Created by: Paweł Kołodziejczykhard 55% In the Czech RepublicIn the Czech Republic2229In SlovakiaIn Slovakia3252In CroatiaIn Croatia7996In HungaryIn Hungary972lakes riddles » How many players of one team are there in a pool during the water polo game?7. A team consists of 6 field players and one goalkeeper in the water at any one time. Created by: Paweł Kołodziejczykhard 52% 553904775960999781111450sport riddles » Play water quiz and see all the questions.