DaTario said:My problem with your answer is that I have the ideia that, in simple electric circuits, when the current starts, I used to think that the current will be established in all positions basically at the same time, and not only near the negative pole of the battery. Thus, it seems reasonable to me that, in a discharge lamp, when the negatively charged electrode starts sending its electrons, the glow would appear also in all positions of the electron's path to the positively charged electrode.
When driven from a DC source, only the negatively charged electrode (cathode) will glow. When driven from an AC source, both electrodes will glow (each during alternate half cycles).
Neon is a chemical element with the symbol Ne and atomic number 10. It is a noble gas commonly used in polarity measurement because it has a high electronegativity and is non-reactive, making it a good indicator of polarity in a sample.
Neon is often used in polarity measurement as a reference gas. By measuring the voltage required to ionize neon in a sample, the polarity of the sample can be determined. Neon can also be used as a tracer gas in chromatography to measure the polarity of a stationary phase.
Polar molecules have an uneven distribution of charge due to differences in electronegativity between atoms, resulting in a positive end and a negative end. Non-polar molecules have an even distribution of charge and do not have a positive or negative end.
Yes, other noble gases such as helium, argon, and krypton can also be used in polarity measurement. However, neon is the most commonly used because it has the highest electronegativity and is the most easily ionized, making it a more sensitive indicator of polarity.
Polarity measurement has many applications in various fields such as chemistry, biology, and environmental science. It is used to determine the polarity of solvents, identify unknown substances, and understand intermolecular interactions. It is also used in quality control and analytical testing of products such as pharmaceuticals and cosmetics.