Glowing, Exploding, Bubbling, Color Change, Precipitates Reaction Types Glowing, Exploding, Bubbling, Color Change, Precipitates

II. Writing a Reaction 2NaOH(s) + H2SO4(aq) Na2SO4(s) + 2H2O(l) A) Reactants 1) What you start with 2) What will react 3) A solid and something dissolved in a liquid

2NaOH(s) + H2SO4(aq)Na2SO4(s)+2H2O(l) A) Products 1) What is produced in a reaction 2) A solid and a liquid 3) If a reaction is a factory, it makes a product 2NaOH(s) + H2SO4(aq)Na2SO4(s)+2H2O(l)

C) Other information about Writing a Reaction 1)  means “yields,” or “produces” a) Solid sodium hydroxide reacts with Sulfuric Acid in an aqueous solution “yields/produces,” solid sodium sulfate and water. b) State of matter - (s) = solid - (l) = liquid - (g) = gas - (aq) = aqueous solution, solid or liquid mixed with water, given information

III. Reaction Types Decomposition Synthesis Single Replacement Double Replacement Combustion

Decomposition 1) A single compound breaks down into 2 or more compounds or elements 2) AB  A + B 3) 2NaN3(s)  2Na(s) + 3N2(g)

Synthesis 1) Two or more reactants combine to form one product. 2) A + B  AB 3) 2Na(s) + Cl2(g)  2NaCl(s)

Single Replacement 1) The atoms of one element replace the atoms of another element. 2) A + BX  AX + B 3) 2Li(s) + 2H2O(l)  2LiOH(aq) + H2(g)

Double Replacement 1) The positive and negative ions of 2 compounds switch place 2) 2 ions or polyatomic ions trade parts of themselves with one another 3) AX + BY  AY + BX 4) Ca(OH)2(s) + 2HCl(aq)  CaCl2(s) + 2H2O(l)

Combustion 1) Oxygen combines with a substance and releases energy in the form of heat and light. (A.K.A. burning) 2) 2H2(g) + O2(g)  2H2O(l) 3) CH4(g) + O2(g)  CO2(g) + H2O(l)