Chem homework


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  • Hey there! Amy! I heard that you've just have your first Chemistry lesson. How was it?
  • Oh hey, Jason! Yes, I was. It was pretty great, but I got confused by the concept of elements!
  • Well, don't worry, come and have a seat and I'll explain it to you! That's pretty easy!
  • Oh, really?
  • Take hydrogen as an example, Hydrogen is an essential element for life. It is present in water and in almost all the molecules in living thingswhich is colourless, odourless gas. It has the lowest density of all gases.
  • If we combind hydrogen and nitrogen at high pressure and temperature produces ammonia (NH3). This is called chemical change.
  • Another example is sodium.Sodium is a soft metal that tarnishes within seconds of being exposed to the air. It also reacts vigorously with water. The most common compound of sodium is sodium chloride (common salt). It is added to food and used to de-ice roads in winter. It is also used as a feedstock for the chemical industry.
  • Here is a physical change. When sodium is not exposed to air is silvery-white in color and is bright and shiny. When it is exposed to air, it becomes dull and gray because of the reaction with the oxygen present in the atmosphere.
  • Moreover, there is Neon. The largest use of neon is in making the ubiquitous ‘neon signs’ for advertising. In a vacuum discharge tube neon glows a reddish orange colour. Only the red signs actually contain pure neon. Others contain different gases to give different colours.
  • Under low pressure, it glows a bright orange-red if an electric current is passed through it. This is an exaple of physical proporties.
  • So, do you understand it now?
  • Yes, I do! That's really thought-provoking, thanks Jason!
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