Chapter 8 Review

Chemical Equations Test10 multiple choice/fill in the blank questions 5 skeleton equations that you will have to

balance and classify 5 word equations that you will have write

the skeleton equation and balance. 5 unfinished equation in which you will predict the products and balance.

Sec. 1 Balancing EquationsFirst, identify the REACTANTS & PRODUCTS. (You may want to write or

say out loud a word equation first.)• Using correct formulas and symbols, write an unbalanced equation for the reaction. {A SKELETON EQUATION}• Use coefficients to balance atoms ONE element at a time.• START with elements that appear in only one reactant and one product, and balance the atoms of those elements first.• IF a polyatomic ion appears on both sides of the equation, treat it as a single unit.• Leave Oxygen and Hydrogen for the last elements to balance.• Double-check to be sure that the number of atoms of each element is the same on both sides of the equation

Sec. 2 Predicting Equations• The five types of chemical rxns. in this unit are:

Synthesis (S) A+ X AX Decomposition (D) AX A + X **Single Displacement (SD) A + BX AX + B

X + AY AX + YDouble Displacement (DD)

AX + BY AY + BXCombustion (C) CxHy + O2 CO2 + H2O

** There are 5 special types of decomposition

Sec. 3 Activity Series An aid to predicting the products of SD Rxn. It also can be

used in predicting products of some other reactions

Each element on the list replaces from a compound in aqueous solution any of the elements below it.

The first seven elements (Li - Na) react with cold water

The next five metals (Mg – Cr) react with steam.

The oxides of all of these first metals resist reduction by H2.

The next six (Fe-Pb) and all metals above will react with acids.

Metal oxides below Cr undergo decomposition by heating.

All metals above Cu, can combine directly with oxygen.

The last five metals (Hg - Au) are found free in nature, their oxides decompose when heated. They must be

forced to form oxides.

Complete Chapter 8 Book review

Page 290-292Complete problems (12)1, 3, 7, 11, 13,

15, 18,19, 20, 27, 28 &

35