The presence of hydronium ions relative to hydroxide ions determines a solution´s pH.
Water is a very stable compound of hydrogen and oxygen, vital for all known forms of life. In nature it occurs in liquid, solid and gaseous state.
Colourless, odourless, lighter-than-air gas. The most common chemical element in the universe.
The compound of hydrogen and oxygen. Colourless, odourless liquid; heavier than water.
An exercise about the polarity of molecules.
A colourless, odourless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.
Paper was invented more than two thousand years ago.
Knallgas is the mixture of hydrogen and oxygen. It will explode when ignited.