What is a Chemical Reaction? Is burning a twig a chemical or physical change? What about dissolving salt into water? How do I know?

Products vs Reactants If I take Glucose and Oxygen and I end up with 2 new compounds, Carbon dioxide and Water Write a word equation showing the REACTANTS on the Left and PRODUCTS on the Right

Glucose plus Oxygen YIELDS Carbon dioxide and Water Glucose plus Oxygen Carbon dioxide and Water Next we turn each name into the correct compound using symbols.

C 6 H 12 O 6 +O 2 CO 2 + H 2 O ______________ ___________ Insert into the blanks REACTANTS or PRODUCTS

We can also add symbols that show the state of matter for each compound. C 6 H 12 O 6 (s) +O 2 ( g ) CO 2 ( g ) + H 2 O( l ) s=Solid l= Liquid G=Gas

Practice writing Word Equations and Chemical Equations 1.If I mix Zinc metal and hydrochloric acid (HCl), I end up with Zinc Chloride plus Hydrogen gas. 2.If I mix Sodium hydroxide with hydrochloric acid, I end up with Sodium Chloride and water 3.Sodium mixed with water gives me Sodium Hydroxide plus Hydrogen gas.

Balancing Equations What is the law of Conservation of Mass? Mass can neither be created nor destroyed. cing-chemical-equations L8&feature=related Balancer3/default.htm

_Na +_H 2 O _NaOH + _H 2 We need to determine if there is the same number of atoms of each element on the right as on the left. Make a table: (Hint: water can also be written as H + OH - ) Na 1 H 1H 2 OH 1 SO: WE NEED TO BALANCE THE EQUATION. H OH

_Na +_H 2 O _NaOH + _H 2 Na 1 H 1H 2 O H 1 H OH2