LET’S REVIEW!

Periodic Table1. Where are metals located?2. Where are nonmetals?3. What are elements in the following

groups called:a. 8Ab. 7Ac. 1Ad. 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. Hb. Oc. S

7. What are the oxidation numbers for the following polyatomic ions (see p.919?):

a. NH4b. NO3

Writing Compound Formulas8. Write the formulas for

compounds formed by the following ions:

a. H+ + O-2

b. NH4+1 + S-2

c. Ti+4 + NO2-1

9. Now NAME those compounds.

Types of Chemical Reactions10. 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 + Cl2 → FeCl3

b. NH4NO3 → N2O + H2Oc. Li + H2O → LiOH + H2

d. NaOH + CuCl2 → NaCl + Cu(OH)2

Writing Chemical Equations11. 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(NO3)2 + NaOH → Cu(OH)2 + NaNO3

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(NO3)2 + 2NaOH → Cu(OH)2 + 2NaNO3