1. 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)

2. 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.

3. 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 Mg0
*This type of reaction is called a synthesis reaction (bring together)

4. *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.
2H H
* This type of reaction is called a decomposition reaction. (Break apart)

5. *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.

6. 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.