Chemthink: Chemical Reaction

1.) reactants.
2.) products.
3.) chemical change has taken place.
4.)there is a rearrangement of chemical bonds.
5.) breaking and forming
6.) atoms
7.) missing atoms or any new ones.
8.) rearrange the bonds
9.) 2 atoms of H and 2 atoms of O as reactants. 1 molecule of H2O 2,1 atom of O leftover. =H2O.
10.) 2 H2 + 1 O2 = 2 H2O
11.) Law of Conservation of Mass
12.) mass ,atoms
13.) 2 Cu + 1 O2 . 2 CuO
14.) 1 Cu atoms ,1 Cu atoms , 2 O atoms /,1 O atoms
15.) 2 ,oxygen
16.) oxygen, Cu, Cu
17.) 2 Cu , 1 O2 ,2 CuO ,2 Cu atoms = 2 Cu atoms , 2 O atoms = 2 O atoms
18.) 1 CH4 , 2 O2 , 2 H2O 1 ,CO2
19.) 1 N2 , 3 H2 , 2 NH3
20. )2 KCIO3 , 2 KCI , 3 O2
21.) 4 Al , 3 O2 , 2 Al2O3
Summary:
1.) Chemical reactions always involve breaking bonds.
2.) The Law of Conservation of Mass says that the same atoms must be present before and after the reaction.
3.)To balance a chemical equation, you change the coefficients in front of each substance until there are the same number of each type of atom in both reactants and products.