Study Guide for Test 11/14

Chapter 12

Answers to Chpt 12 practice pg. 439
1. C
2. D
3. B
4. C
5. D
6. A
7. B
8. C
9. a. tetrahedral   b. trigonal planar   c. trigonal pyramid

What to study for Chpt 12
--types of bonds: what is difference between ionic, covalent an polar covalent
--what are the properties of an ionic bond
--understand what is electronegativity and what elements have the highest/lowest electronegativity
--what is a dipole moment in a molecule and be able to tell what is the positive and negative side of the bond
--know what are the charges that elements in groups 1-8 make when they form an ion
--know what will be the formula when two elements form a compound by their ionic charges
--know how to make Lewis structures for covalent compounds
--know that all atoms (except hydrogen and helium) are looking for eight electrons due to the octet rule
--know how to recognize a lone pair and a bonded pair of electrons in a Lewis structure
--know what VSEPR model or shape that the molecule will take based on its Lewis structure

Chapter 7:

Practice test pg. 237
1. D
2. B
3. C
4. D
5. A
6. B
7. C

9. Mg (s) + 2H₂O (l)   arrow         H₂ (g) + Mg(OH)₂ (aq)

10. Pb(NO₃)₂ (aq) + 2NaI (aq) arrow  PbI₂ (s) + 2NaNO₃ (aq)

11. C₃H₈ (g) + 5O₂  arrow   3CO₂ (g) + 4H₂O (g)

12. 2Ca(s) + O₂ (g)   arrow   2CaO (s)

 
--know what are the signs of a chemical reaction
--what makes a reaction chemical as opposed to physical
--how to make formulas for a chemical equation
     --keep in mind roman numerals for transition metals
     --remember that gases and halogen elements are always diatomic and have two atoms