1. Solid calcium reacts with liquid water to produce aqueous calcium hydroxide and hydrogen gas: a. write a balanced chemical equation for the reaction (you may need your blue ion sheet). Q Of The Day Day 3 5-14 Ca (s) + 2H 2 O (l)  Ca(OH) 2(aq) + H 2(g)

2. Solid magnesium reacts with fluorine gas to produce solid magnesium fluoride. Equation: Build:

3. Balancing Equations Chemicals equations are not always balanced, sometimes we will have to balance them … 1. Balance different types of atoms one at a time 2. Start with atoms that appear only once on each side Notes page 3

4. 1. Balance different types of atoms one at a time 2. Start with atoms that appear only once on each side 3. Balance polyatomic ions that appear on both sides of the equation as a single unit 4. Balance H and O atoms last Balancing Equations

5. If it’s not working… 1. Deep breathe 2. Check your chemical formulas 3. NEVER change subscripts this changes the compounds!!! 4. It’s ok to start over if you get frustrated Balancing Equations

6. F 2(g) + K (s)  KF (s) Al (s) + O 2(g)  Al 2 O 3(s)

7. Balancing Equations Na + Mg 3 (PO 4 ) 2 → Mg + Na 3 PO 4 Polyatomic Example:

8. C 6 H 14 + O 2 CO 2 + H 2 O COHCOH COHCOH 6 2 142 3 1 C’s First 6 12 13 O’s Second 14219 26 28 38 12 38 6 Balancing Equations Notes page 4

9. Read pages 346-349, define chemical equation and skeleton equation, AND complete #s 1 and 2 on page 349. ADD: Review section 11.1 and complete #s 7-11 (for #s 9 and 11 complete part a only) on page 354 Assignment – hand in NOW

10. Balance the following: Q Of The Day Day 4 5-15 Mg (s) + H 3 PO 4(aq)  Mg 3 (PO 4 ) 2(aq) + H 2(g) 233

11. 3. Write a balanced chemical equation describing the reaction between Magnesium Hydroxide and HF to produce MgF 2 and water. 1. Formula: Magnesium Hydroxide? 2. Name for: HF and MgF 2 ? Day 4 5-15

13. balance the following rxn: C 3 H 8 + O 2  CO 2 + H 2 O Q Of The Day Day 5 5-18

14. http://education.jlab.org/elementbalancing/in dex.htmlhttp://education.jlab.org/elementbalancing/in dex.html (10 questions at beginner and 10 at intermediate in 15 tries each) http://www.sciencegeek.net/Chemistry/taters/ EquationBalancing.htmhttp://www.sciencegeek.net/Chemistry/taters/ EquationBalancing.htm - bonus Go to wiki and click links – shssci.wikispaces.com:

15. C 6 H 14 + O 2 CO 2 + H 2 O COHCOH COHCOH 6 2 142 3 1 C’s First 6 12 13 O’s Second 14219 26 28 38 12 38 6 ATB – Complete in the notes!!! Notes page 4 Day 6 5-19

16. http://education.jlab.org/elementbalancing/in dex.htmlhttp://education.jlab.org/elementbalancing/in dex.html (10 questions at beginner and 10 at intermediate in 15 tries each) http://www.sciencegeek.net/Chemistry/taters/ EquationBalancing.htmhttp://www.sciencegeek.net/Chemistry/taters/ EquationBalancing.htm - bonus Go to wiki and click links – shssci.wikispaces.com:

17. Balance: C 4 H 10(g) + O 2(g)  CO 2(g) + H 2 O (g) Balance: H 2 SO 3 + Mg(OH) 2  MgSO 3 + H 2 O Day 1 5-20

18. Types of Chemical Reactions Synthesis reaction – composition reaction – 2 or more substances combine to form a new compound A + B AB A and B = eles. Or cmpds. AB = cmpd. Example # 1: 2H 2 (g) + O 2 (g) 2H 2 O(g) A B AB Synthesis Reactions

19. A and B = eles. Or cmpds. AB = cmpd. Example # 2: 2H 2 SO 3 (aq) + O 2 (g) 2H 2 SO 4 (aq) A B AB Example # 3: CaO(s) + SO 2 (g) CaSO 3 (s) A B AB Types of Chemical EquationsSynthesis Reactions

20. Types of Chemical EquationsSynthesis Reactions Examples: - an element reacts with oxygen to form an oxide - most metals react with halogens to form cmpds. - oxides of active metals react with water to produce metal hydroxides - certain metal oxides and nonmetal oxides react to form salts

21. Types of Chemical EquationsSynthesis Reactions

22. Types of Chemical EquationsDecompostion Reactions decomposition reaction – single compound undergoes a reaction that produces 2 or more simpler subs. – usually require add. of energy (heat or electricity) AB A + B A and B = eles. Or cmpds. AB = cmpd. Example: 2H 2 O(l) 2H 2 (g) + O 2 (g) AB A B electricity

23. Types of Chemical EquationsDecompostion Reactions Examples: - electric current to a binary compound producing its elements - heating the oxides of less active metals - Metal carbonates produce metal oxide + CO 2

24. Types of Chemical EquationsDecompostion Reactions Electrolysis – decpomposition of a substance by an electrical current

25. Types of Chemical EquationsDecompostion Reactions