Unit 4 Reactions Exam Reveiw

State the FIVE indicators of a chemical reaction

1. Color Change

2. Gas Produced

3. Precipitate Formed

4. Temperature Change

5. Texture Change

Reactant

Substances written on the left side of the equation

Product

Substances written on the right side of the equation

Phase Notation

Are physical symbols (S, L, AQ) which are used as subscripts.

Coefficient

A number written in front of the chemical formulas in a balanced chemical reaction

Hydrogen and chlorine gases react to from hydrogen chloride gas

H2(g) + Cl2(g) —> 2HCL(g)

___ NH4NO3 + ___ CA3(PO4)2 —>___(NH4)3PO4 + ___Ca(NO3)2

6 NH4NO3 + CA3(PO4)2 —> 2 (NH4)3PO4 + 3 Ca(NO3)2

Synthesis

A+B—→AB ; One product

Decomposition

AB —> A+B ; One reactant

Single Replacement

AB+C —> A+CB ; Metal replaces metal, non-metal replaces non-metal

Double Replacement

AB+CD —> AD+CB ; like changing partners in a dance

Combustion

Hydrocarbon(g) O2(g) —> CO2(g) + H2O(g) ; oxygen is a reactant in reaction.