ELECTRON CONFIGURATIONS

• Sulfur• 1s22s2sp63s23p4

• Chromium• 1s22s22p63s23p64s23d4

• Lead (give the noble gas configuration)

• [Xe]6s24f145d106p2

• Barium• [Xe]6s2

Name the element…

• 2p3

• nitrogen• 4s2

• calcium• 4d6

• rhodium• 5 p6

• xenon

Identify As Either Ionic Or Covalent

• potassium hydroxide

• ionic

• Pb3S2

• ionic• Nitrogen dioxide• Covalent• Carbon tetrachloride• covalent• ammonium sulfate• ionic

• Carbon monoxide• covalent• Magnesium

chloride• ionic• Sulfur dioxide• covalent• Dihydrogen

dioxide• covalent

Give the oxidation numbers

• Oxygen • -2• Calcium• +2• Aluminum• +3• Chlorine• -1

So, how many protons and electrons?

• Oxygen• 8 p, 10 e• Calcium• 12 p, 10 e• Aluminum• 13 p, 10 e• Chlorine• 17p 18 e

Writing Formulas And Naming Ionic Bonds

• KOH potassium hydroxide• (NH4)2S

ammonium sulfide• KCl potassium chlorideLi2S

• Lithium sulfide

• Calcium iodide• CaI2

• Ammonium hydroxide• NH4OH

• Aluminum chlorate• Al(ClO3)3

• Lead(II) sulfide• Pb3S2

• Magnesium hydroxide• Mg(OH)2

Writing formulas andnaming covalent bonds

• CO2

• Carbon dioxide• CH4

• Carbon tetrahydride• S3O

• Trisulfur monoxide

• Sulfur trioxide• SiO3

• Dinitrogen trisulfide• N2S3

• P3N2

• Triphosphorus dinitride

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

• Given the two chemical equations, circle the one that is balanced. a. 2Na + Cl2 → 2NaCl

b. 2Na + 2Cl2 → 2NaCl

(a is balanced)

a. C3H8 + 5O2 → 3CO2 + 4H2O

b. 2C3H8 + 5O2 → 3CO2 + 8H2O

(a is balanced)

a. 2NH3 + 5O2 → 2NO + 3H2O

b. 4NH3 + 5O2 → 4NO + 6H2O

(b is balanced)

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

• 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

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

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. 1 year (1 half-life= 500 g) 2 year (2 half-lives = 250 g) 3 years (3 half-lives = 125 g left)

Identify The Reactant(s) In The Equation

• SnO2 + 2 H2 → Sn + 2 H2O

• SnO2 + 2 H2

• What are Sn + 2 H2O?

• The products

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

• 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

• 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

SCIENTISTS…• BohrBohr Model • MendeleevOrganized Periodic Table by atomic number• Rutherford The atom is mostly empty space• JJ ThompsonPlum pudding modelDemocritusFirst came up with the idea that all matter is made of

atoms, but that it cannot be broken down any further

• Review all the worksheets!!!• Good luck!