| A | B |
|---|
| chemistry | study of properties of matter and how matter changes |
| compounds | 2 or more elements chemically combined |
| indicates a chemical reaction | change in color, temp., properties or precipitation or gas bubbles |
| atom | smallest part of an element |
| molecule | 2 or more atoms |
| conservation of mass | mass of reactants=mass of products, matter can't be created or destroyed |
| 3 categories of chemical reactions | replacement, decomposition, synthesis |
| replacement | 2 elements trade places |
| decomposition | break down fo compound into simpler substances |
| synthesis | put elements together, more comples |
| 3 factors that affect the rate of a reaction | concentration, temperature, surface area |
| structure of an atom | nucleus (p + n) with electrons moving in all directions outside |
| how a chemical bond forms | electrons are transferred or shared between atoms |
| how atoms are organized in the periodic table | left to right by atomic number |
| ionic bonds | attraction between 2 oppositely charged ions |
| polyatomic ion | ions made of more than 1 atom |
| characteristics of ionic compounds | high melting point, crystal shape, conducts electricity |
| why salt won't conduct electricity | electrons don't flow through a solid |
| covalent bond | when 2 atoms share electrons |
| factors that affect solubility | temperature and type of solvent |
| acid | tastes sour, turns limus red, reacts w/carbonates and metals |
| base | tastes bitter, turns litmus blue, slippery, doesn't react w/carbonates |
| neutralization reaction | produces water and salt |
| chemical digestion | breaks large molecules into smaller particles |
| mechanical digestion | grinds, tears, mashes large food particles |
