Exothermic
In a exothermic reaction heat is
released
absorbed
The starting pieces of a reaction
reactants
How many atoms of Oxygen in 3 H2O
3
State the law of conservation of mass
Matter cannot be created or destroyed, it can only change form
The release of heat causes a rise in
temperature
Taking in heat may cause the products to feel
cold
The end pieces of a reaction
products
How many atoms of oxygen in (SO4)3
12
Do the products or reactants have more stored energy?
Reactants
Do the reactants or products have more stored energy?
Products
This tells you how many of a certain kind of atom there are in a molecule (H2O)
Subscript
How many molecules of water in 4 H2O
4
The minimum energy required to start a reaction (applies to both exo and endothermic rxns)
Activation energy
What speeds up a reaction by lowering activation energy?
catalyst
This tells you how many molecules there are in a reaction (2 NaCl)
Coefficient
How many atoms of calcium in 3 CaCl2
3