(2) Which activity would you do to prove that the temperature of a substance must reach
the combustion point of that substance in order to ignite it?
Answers
Answer:
perfectly correct to use latent heat in an explanation of constant temperature during melting and freezing. However it explains little to those without chemistry or specifically thermodynamics education. With regard to freezing and melting, the key is crystal structure. To freeze means to crystallize from a liquid. To melt is to turn from crystal to liquid. As you transition from liquid to crystal at the freezing point ( that is unique for every pure material ), the atoms or molecules in the liquid come together atom by atom or molecule by molecule to build a crystal lattice. In the crystal, the atoms or molecules stop jumping around and wiggling like they did in the liquid. In the liquid, molecules are like people in Times Square while the crystal has the molecule in rows like soldiers in formation. The soldiers can move around a little but not much because there are soldiers all around. Molecules or atoms in the liquid have a little more energy that makes them run around and wiggle like children in school filled with sugar. As the sugar wears off, the kids slow down and stop running. The molecules in the liquid have some extra energy that gets thrown away when the molecule settles down to land on the crystal surface. As more molecules join the crystal, they each throw off a little energy. If you want to take the molecule away from the crystal, you add enough energy to kick it out and make it a liquid as in melting. The temperature at freezing is just that maximum temperature that all the molecules are happy as a solid crystal. They are wggling a lot but happy as an army of soldiers in formation. As temperature goes down from there, the wiggling gets smaller and the crystal gets smaller because the room for wiggling gets smaller. The latent heat is that hunk of energy the molecule throws away when it joins the crystal. It is exactly that same heat or energy to release that molecule during melting. If the liquid is above the freezing temperature, the molecules have too much energy to ever settle into a crystal. Only when the temperature goes down to the freezing temperature is it possible to freeze. Then the liquid at the freezing temperature can give up the latent heat energy to turn into solid crystal. The heat goes into the liquid and is conducted away as the whole mess cools down after all the liquid has given up its energy. Similar story for gas turning to liquid called condensation. Latent heat is called evaporation heat or boiling heat.
Answer:
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