| A | B |
|---|
| reactants | substances to the left of the reaction symbol |
| products | substances to the right of the reaction symbol |
| ---> | "yields" |
| <=> | reaction symbol indicating a reaction is reversible |
| catalyst | a substance that alters the rate of the reaction but is not a reactant |
| enzyme | an organic catalyst |
| ∆ | Greek letter "delta" used to indicate change |
| ∆H | indicates change in heat |
| endothermic | reaction that absorbs heat, results in colder temperature |
| exothermic | reaction giving off heat, causing temperature increase |
| ↓ | indicates substance precipitates as a solid |
| ꜛ | indicates substance bubbles off as a gas |
| precipitate | a product that forms as an insoluble solid substance |
| effervescence | bubbling off of a gaseous product |
| coefficients | numbers written in front of chemical formula to indicate the number of units of that substance required to balance the reaction equation |
| subscripts | numbers written to behind and slightly below the element's symbol in a compound formula indicating the number of atoms in a molecule |
| Conservation of Atoms | fundamental concept that the number of atoms of each element must be the same on both sides of the reaction arrow |
| (s) | symbol written after a substance formula to indicate it is a solid |
| (l) | symbol written after a substance to indicate is is a liquid |
| (aq) | symbol written after a substance to indicate it is in a water solution, "aqueous" |
| (g) | symbol written after a substance to indicate it is a gas |
