Chemical Reactions

“to produce” or “yield” Chemical Equations 2 H2 (g) + O2 (g) 2 H2O (l) coefficient Product(s) Reactants “Reactants with” “to produce” or “yield” State of matter

Interpretation 2 H2 + O2 → 2 H2O Two molecules One molecule 2 moles 2(2.02 g) 32.00 g 2 (18.02 g) 36.04 g reactants   36.04 g product

Evidence Temperature change Color change Odor Gas/bubbles Appearance of a solid (precipitate) **difference in composition before and after

Types of Reactions Synthesis/combination Decomposition  +

Combustion Wax is made of carbon and hydrogen atoms bonded together in long chains. The chains are tangled, intertwined and packed together to make the wax.

Single-displacement Double-displacement +   Like “Wife Swap”