LET’S REVIEW!

Periodic Table 1. Where are metals located? 2. Where are nonmetals? 3. What are elements in the following groups called: a. 8A b. 7A c. 1A d. 2A 4. Where are transition metals located?

Writing Compound Formulas 5. What is “oxidation number”? 6. What are the oxidation numbers for common ions formed by the following elements: a. H b. O c. S 7. What are the oxidation numbers for the following polyatomic ions (see p.919?): a. NH 4 b. NO 3

Writing Compound Formulas 8. Write the formulas for compounds formed by the following ions: a. H + + O -2 b. NH S -2 c. Ti +4 + NO Now NAME those compounds.

Types of Chemical Reactions 10. Identify the TYPE of chemical reactions shown AND name all the compounds in each equation (remember the list of polyatomic ion names on p.919): a. Fe + Cl 2 → FeCl 3 b. NH 4 NO 3 → N 2 O + H 2 O c. Li + H 2 O → LiOH + H 2 d. NaOH + CuCl 2 → NaCl + Cu(OH) 2

Writing Chemical Equations 11. What do following signs and symbols mean in a chemical equation: a. → b. (s) c. (l) d. (g) e. (aq)

Writing Chemical Equations (continued)  Write a word equation for putting together a made-from- scratch cake.  Example of a chemical word equation from your Chemical Changes lab: Copper (II) nitrate + sodium hydroxide → copper (II) hydroxide + sodium nitrate

Writing Chemical Equations (continued)  The skeleton equation of this word equation is: Cu(NO 3 ) 2 + NaOH → Cu(OH) 2 + NaNO 3  What is the law of conservation of matter?  Skeleton equations APPEAR to have a gain or loss of matter – they are not balanced.

Writing Chemical Equations (continued)  Balanced equations have the same number of each type of element on each side of the equation, obeying the law of conservation of mass: Cu(NO 3 ) 2 + 2NaOH → Cu(OH) 2 + 2NaNO 3