Types of Chemical Reactions Ch. 6.2 List the 5 signs that a chemical reaction has occurred: 1. Color Change 2. Temperature Change 3. Production of gas 4. Precipitate forms 5. Change in properties (texture, shape)

Types of Chemical Reactions Ch. 6.2 When a chemical reaction occurs, bonds are broken, or made, atoms are re-arranged, creating new combinations of compounds and molecules with new properties.

Let’s use circles to represent elements and compounds. 1. or A + B AB *This is like burning a magnesium strip in air (O2) (think back to the metals lab). 2Mg + 02 2Mg0 *This type of reaction is called a synthesis reaction. (bring together)

*This is what happens when water is split using Let’s use circle to represent elements and compounds. 2. or AB A +B *This is what happens when water is split using electricity. 2H20 2H2 + 02 * This type of reaction is called a decomposition reaction. (Break apart)

*When hydrochloric acid and zinc metal are mixed, this happens: Let’s use circle to represent elements and compounds. 3. or A + BC AC + B *When hydrochloric acid and zinc metal are mixed, this happens: 2Zn + 2HCl ZnCl2 + H2 *This is a single replacement reaction.

Lead nitrate (PbNO3) with Potassium Iodide (KI) PbNO3 + KI PbI + KNO3 Let’s use circle to represent elements and compounds. 4. or AB + CD AD + CB *This is like mixing: Lead nitrate (PbNO3) with Potassium Iodide (KI) PbNO3 + KI PbI + KNO3 *This is called a double replacement reaction.