By Alan Gladwell
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Additional info for Advances in Physics
How can the stress-strain graph for a metal be explained in terms of ions in a sea of electrons? 3. As a metal heats up, what happens to its conductivity? Why? Polymers A simple polymer consists of a long chain of monomers (components of molecules) joined by covalent bonds. A polymer usually consists of many of these bonds, tangled up. This is known as a bulk polymer. Types A bulk polymer may contain two types of regions. In crystalline regions, the chains run parallel to each other, whereas in amorphous regions, they do not.
At this point in the course, it is easy to get bogged down in the complex theories and equations surrounding 'waves'. However, a better understanding of waves can be gained by going back to basics, and explaining what on Earth a wave is in the first place. Definitions A wave, at its most basic level, is a disturbance by which energy is transferred because this disturbance is a store, of sorts, of potential energy. " In some cases, this is easy to answer, because some waves travel through a medium.
Extra nasty question which you won't ever get in an exam) What is the toughness of glass? Metals Metals are constructed from positive ions in a sea of electrons. This explains many of their properties. There are several physical properties of metals you need to know about: Electrical Conductivity Metals consist of positive metal ions in a 'soup' or 'sea' of free (delocalized) electrons. This means that the electrons are free to move through the metal, conducting an electric current. Stiffness The charge between the negatively charged electrons and the positively charged ions holds the ions together, making metals stiff.