1. What is a _____________________? ► The process by which one or more _____________ change to _____________ one or more different _____________. ► In a chemical reaction, the original substances are called the _____________. ► The substances that are created are called _____________.  _____________  _____________

2. To be classified as a chemical reaction, a chemical change must occur. ► What is the evidence of a chemical reaction?  Change in _____________ ► Release of energy as _____________ ► Production of a _____________ ► Reduction or increase of _____________ Absorption or release of _____________ energy

3.  Formation of a _____________ _____________ ► Formation of a _____________ ► Formation of a _____________ – _____________ solid ► _____________ change in _____________ ► Change in _____________ ► You must always verify to ensure that a _____________ change didn’t occur

4. Helping chemical reactions to occur ► For a chemical reaction to occur, the reactants must be _____________ _____________. ► During chemical reactions, energy is either _____________ (endothermic) or _____________ (exothermic). ► As a result, energy can appear as a _____________ (endothermic) or a _____________ (exothermic).

5. Chemical equations also show the physical states and reaction information SymbolMeaning (s) (l) (g) (aq) or or heat  catalystPd

6. With this information, we can now construct chemical equations. ► _____________ _____________– a representation of a chemical reaction that uses _____________ to show the relationship between the _____________ and the _____________. ► Step one – write a _____________ ____________  Write the names of _____________ separated by a plus sign.  Use an _____________ to separate the _____________ from the _____________.  Write the names of the _____________ separated by a plus sign

7. ► Step 2 - Convert the names into _____________. This is known as an _____________ or _____________ equation. ► Step 3 - Balance the atoms by changing the _____________ only  This is how we conserve _____________ and obey the law of conservation of _____________

8. Hints when balancing equations 1) Use _____________ to balance atoms involved 2) Balanced equations show _____________ _____________ 3) _____________ change the _____________ when balancing an equation 4) _____________ _____________ can be balanced as a unit