Why does NH_3 have a lower boiling point than H_2O? Define briefly: a) boiling point. b) melting point. Use atomic or molecular properties to explain why calcium oxide has a much higher melting point (2580 degrees Celsius) than potassium fluoride (858 degrees Celsius). ...
Why is the melting point of an element lower than its boiling point? Why do ionic compounds have high melting points? Explain why the melting point and boiling point of alkali metals are low. Why does MgO have a higher melting point than CaS?
1. What is the electron configuration for chlorine? One common ion of chlorine is Cl ^1- . How many valence electrons does this ion have? 2. Explain the atomic packing (both in words and with a pictur Why is it that th...
Dr. Hans Nieper, working in Germany, is considered by some to be one of the world's great innovative medical geniuses. He inventedCalciumEAP, which is also aneurotransmitterwhich may have something to do with its effectiveness in treatingMS. Some in the medical establishment consider this produc...
For one, rock salt does have its limits. If the temperature of the roadway is lower than about 15 degrees F (minus 9 C), the salt won't have any effect on the ice. The solid salt simply can't get into the structure of the frozen water to start melting ice. In these cases, the...
+ My Mom has pretty healthy teeth, but she does say that she notices that they are whiter. +Katie, my best friend, says she noticed her teeth have gotten whiter she find the process relaxing so it doesn’t bother her to do it. ...
A substance has a low melting point. It does not conduct electricity either when melted or as a solid. It is most likely: A. Diamond (C) B. Copper (Cu) C. Sodium (Na) D. Hydrogen sulfide (H_2S) The method used to separate iron filings from sand is [{Blank...
Why does urea have a sharp melting point but glass does not? What is the difference between an open or closed distillation system? Explain why the 1-bromobutane must be dried with anhydrous calcium before purifying it by fractional distillation. Why is potassium pe...