Test Review

Hey there,

A few ideas I would like to re-present to you before the test and some misconceptions I have seen over the past few days:
1- Heat is just energy, it is not a type of atom or molecule. It affects molecules by making them move around more and spread out.
2- Atoms are tiny tiny tiny, about .0000000000000000000000007 cm. You cannot see them, but their protons, neutrons, and electrons give them their properties and allow them to bond to other atoms.
3- Chemical reactions don't have to be explosive, even if explosions are more fun. Metal slowly rusting from air and rain is a perfect example. Iron (Fe) turns into Iron Oxide (Fe02), which has new properties compared to normal, plain iron.
4- As any substance is heated, its molecules want to expand and move around more. The molecules do NOT change size or get "liquidy", they just spread out. Gases are the most spread out, and solids are the most closely packed.
5- Mass and Energy are conserved in a chemical reaction. This just means if you start out with 1 pound of carbon and 2 pounds of oxygen, you need to have the same amount after the reaction, even if it wasn't all used. You can't just make matter and energy, you can only move it around.