2. Signs of a Chemical Change (Chemical Reaction)
Change in temperature
Change in color
Odor (scent)
Gas bubbles
Appearance of a solid (precipitate)
Supernate: the clear fluid above a precipitate

3. Parts of a Chemical Reaction
Reactants: the starting substance(s) in a reaction
Arrow: means “react to produce” or “yield”
Products: the substance(s) formed in a reaction

4. Types of Chemical Reactions1. 2. 3. 4.
1. Synthesis reaction
2. Decomposition reaction
3. Single-replacement reaction
4. Double-replacement reaction

5. Types of Chemical Reactions (continued......)
Identify each of the following TYPES of reactions:
H2(g) + Cl2(g) → 2HCl(aq)
Cu(s) + 2AgNO3(aq) → 2Ag(s) + Cu(NO3)2(aq)
2NaN2(s) → 2Na(s) + 3N2(g)
Ca(OH)2(aq) + 2HCl(aq) → CaCl2(aq) + 2H2O(l)