Drill Identify what the following symbols mean; s, l, and g. Write the word equation for the following: Mg(s) + O2 (g) 2MgO Objective: Swbat: Apply the conservation of mass in order balance equations.

SAT Enrichment:

The Bike Shop You have the following parts to assemble a bike Wheel, frame, pedal, handlebar What combination of the parts do you need to make 1 bike? 2 wheels + 1 frame + 2 pedals + 1 handlebar → 1 bike What is the same about each side of this “equation? # of parts is the same Chemical equation work the same way – you have to have the same # of parts (atoms) on the reactant side as you do on the product side

Exploration 30 min Balancing Equations WebQuest. Get a Computer for you and your partner. Stop after each question to check understanding. 30 min

Na + H2O → NaOH + H2 Create a flow chart explaining how to balance the above equation. 10 min

Quest Check: Write the balancing charts for each of the seven examples on a separate sheet of paper. Be sure to balance each equation before checking the answer 20 min

Summary Did we accomplish the objective? Explain. What law does balance equations follow? Identify the steps in balancing an equation.

Summary We all have been told the chemical composition of water is H2O, which we assume the reactants to be 2 hydrogens and 1 oxygen. Using the information learn today indentify the true chemical reactions that occurs to make water.

Homework Instructional Fair Page 58. Exit Ticket: Balancing Equations Complete and place in the bin when finished.