Elecrolysis of water, Braşov Center of Excellence
"Electrolysis of water is the decomposition of water(H2O) into oxygen (O2) and hydrogen gas (H2) due to an electric current being passed through the water".
pH of water, Braşov Center of Excellence
"The technical definition of pH is that it is a measure of the activity of the hydrogen ion (H+) and is reported as the reciprocal of the logarithm of the hydrogen ion activity". "The pH of water determines the solubility (amount that can be dissolved in the water) and biological availability (amount that can be utilized by aquatic life) of chemical constituents such as nutrients (phosphorus, nitrogen, and carbon) and heavy metals (lead, copper, cadmium, etc.)".
Water physical properties, Napareuli public school, Theoretical High School "Evrica", Secondary School Ghimbav
Alcohol and water mix because their molecules are polar. Water and oil don't mix, because water molecules are polar, and oil molecules are not polar. Oil and alcohol also do not mix. The water density (1 kg / m3) is higher than the oil density (0.92 kg / m3) and the density of the oil is higher than the density of the alcohol (0.80 kg / m3).
