1. ELECTRON CONFIGURATIONS
Sulfur
1s22s2sp63s23p4
Chromium
1s22s22p63s23p64s23d4
Lead (give the noble gas configuration)
[Xe]6s24f145d106p2
Barium
[Xe]6s2

2. Name the element…
2p3
nitrogen
4s2
calcium
4d6
rhodium
5 p6
xenon

3. Identify As Either Ionic Or Covalent
potassium hydroxide
ionic
Pb3S2
Nitrogen dioxide
Covalent
Carbon tetrachloride
covalent
ammonium sulfate
Carbon monoxide
covalent
Magnesium chloride
ionic
Sulfur dioxide
Dihydrogen dioxide

4. Give the oxidation numbers So, how many protons and electrons?
Oxygen -2
Calcium +2
Aluminum +3
Chlorine -1
Oxygen
8 p, 10 e
Calcium
12 p, 10 e
Aluminum
13 p, 10 e
Chlorine
17p 18 e

5. Writing Formulas And Naming Ionic Bonds
KOH
 potassium hydroxide
(NH4)2S
 ammonium sulfide
KCl
 potassium chloride
Li2S
Lithium sulfide
Calcium iodide
CaI2
Ammonium hydroxide
NH4OH
Aluminum chlorate
Al(ClO3)3
Lead(II) sulfide
Pb3S2
Magnesium hydroxide
Mg(OH)2

6. Writing formulas and naming covalent bonds
Carbon dioxide
CH4
Carbon tetrahydride
S3O
Trisulfur monoxide
Sulfur trioxide
SiO3
Dinitrogen trisulfide
N2S3
P3N2
Triphosphorus dinitride

7. Complete The Blanks In an ionic bond, electrons are ____. Transferred
An ionic bond is always between a__ and a ___.
Metal, nonmetal
In a covalent bond, electrons are ____.
Shared
A covalent bond is always between 2 ____.
Nonmetals
When you name a covalently bonded molecule, you use ____.
prefixes

8. Given the two chemical equations, circle the one that is balanced. 
a. 2Na + Cl2 → 2NaCl
b. 2Na + 2Cl2 → 2NaCl
(a is balanced)
  a. C3H O2 → 3CO H2O
b. 2C3H O2 → 3CO H2O
a. 2NH O2 → 2NO + 3H2O
b. 4NH O2 → 4NO + 6H2O
 (b is balanced)

9. Balance the equations
____ Al + ____Fe3N2 → ___ AlN + ____ F 2,1,2,3 ____Ag2S →____Ag + ____ S8 8, 16,1 ____ ZnS + ____AlP → ____Zn3P2 + ____Al2S3 3, 2,1,1 ____ Cu2O + ____ C → ____ Cu + ____ CO2 2,1,4,1

10. The oxidation number of calcium is _____.+2
Is calcium a metal or nonmetal?
Metal
Because it forms a positive ion, it is called a __.
cation
The oxidation number for chlorine is ____. -1
Is it a metal or nonmetal?
Nonmetal
Because it forms a negative ion, it is called an ____.
anion

11. Definitions… The amount of matter in a substance? Matter
The amount of space an object takes up is
Volume
A ratio that compares the mass of an object to its volume?
Density
If you cut a piece of gold in half, it’s volume and mass change. Does it’s density?
No- density is an intrinsic property

12. Another half-life problem
What is the half-life of an isotope if 125 g of a 1000 g sample of the isotope remains after 3.0 years?
To go from 1000 g to 125 g means that 3 half lives have passed. The half life must be 1 year year (1 half-life= 500 g) 2 year (2 half-lives = 250 g) 3 years (3 half-lives = 125 g left)

13. Identify The Reactant(s) In The Equation
SnO2 + 2 H2 → Sn + 2 H2O
SnO2 + 2 H2
What are Sn + 2 H2O?
The products

14. SOLID, LIQUID OR GAS? Fastest moving particles Gas
Particles are tightly packed together
Solid
The state of matter with an indefinite shape and definite volume
Liquid
Particles are in constant motion
gas

15. The state of matter with an indefinite shape and indefinite volume
gas
The state of matter with a definite shape and definite volume
Solid
List the 3 types of nuclear radiation in order from most massive to least massive.
Alpha, beta, gamma

16. What type of nuclear reaction occurs in the sun?
Fusion
What type of nuclear reaction produces electricity?
Fission
When a chemical reaction occurs, the mass of the reactants ___ the mass of the products.
Equals
If the mass of the reactants is 10 g, then the mass of the products is ___ g. 10
Which law explains why these must be equal?
Law of Conservation of Mass

20. SCIENTISTS… Bohr Bohr Model Mendeleev
Organized Periodic Table by atomic number
Rutherford
The atom is mostly empty space
JJ Thompson
Plum pudding model
Democritus
First came up with the idea that all matter is made of atoms, but that it cannot be broken down any further

21. Review all the worksheets!!!
Good luck!