Welcome to Chemistry I-2!

• Review of Important Chemistry I-1 topics of science!– Nomenclature (writing

formulas and names)– Balancing Equations– Gram / Mole / Atom /

Molecule conversions

SAVE PAPER AND INK!!! When you print out the notes on PowerPoint, print "Handouts" instead of

"Slides" in the print setup. Also, turn off the backgrounds (Tools>Options>Print>UNcheck

"Background Printing")!

Predicting Charges on Monatomic IonsPredicting Charges on Monatomic IonsKNOW THESE !!!!KNOW THESE !!!!

+1 +2 -3 -2 -1 0

Cd+2

Nomenclature Summary Flowchart

Practice Round 1!Practice Round 1!

1. Dinitrogen monoxide

2. Potassium sulfide

3. Copper (II) nitrite

4. Hydrosulfuric acid

5. Chromium (III) sulfate

6. Iron (III) sulfite

7. Calcium oxide

8. Barium carbonate

9. Iodine monochloride

10. Phosphoric acid

Practice Round 2!Practice Round 2!1. BaI2

2. HCl (aq)

3. Ca(OH)2

4. Fe2(CO3)3

5. Na2Cr2O7

6. I2O5

7. Cu(ClO4)2

8. CS2

9. HNO2

10. H2CrO4

– When balancing a chemical reaction you may add coefficients in front of the compounds to balance the reaction, but

you may notnot change the subscripts.

• Changing the subscripts changes the compound. Subscripts are determined by the valence electrons (charges for ionic or sharing for covalent)

Balancing EquationsBalancing Equations

Balancing EquationsBalancing EquationsBalancing EquationsBalancing EquationsSodium phosphate + iron (III) oxide Sodium phosphate + iron (III) oxide

sodium oxide + iron (III) phosphatesodium oxide + iron (III) phosphate

NaNa33POPO44 + Fe + Fe22OO33 ----> ---->

NaNa22O + FePOO + FePO44

Balancing Balancing EquationsEquationsBalancing Balancing EquationsEquations

____C____C33HH88(g) + _____ O(g) + _____ O22(g) ---->(g) ---->

_____CO_____CO22(g) + _____ H(g) + _____ H22O(g)O(g)

____B____B44HH1010(g) + _____ O(g) + _____ O22(g) ---->(g) ---->

___ B___ B22OO33(g) + _____ H(g) + _____ H22O(g)O(g)

The MoleThe Mole

• A counting unit• Similar to a dozen, except instead

of 12, it’s 602,000,000,000,000,000,000,000

• 6.02 X 1023 (in scientific notation)• This number is named in honor of

Amedeo Avogadro (1776 – 1856)Amedeo Avogadro (1776 – 1856)

• The Mass of 1 mole (in grams)

• Equal to the numerical value of the average

atomic mass (get from periodic table), or add

the atoms together for a molecule

1 mole of C atoms = 12.0 g

1 mole of Mg atoms = 24.3 g

1 mole of Cu atoms = 63.5 g

1 mole of O2 molecules = 32.0 g

Molar MassMolar Mass

molar mass Avogadro’s number Grams Moles particles

Everything must go through Moles!!!

CalculationsCalculations

Learning Check!Learning Check!

How many atoms of K are present in 78.4 g of K?

Learning CheckLearning Check!!

What is the mass (in grams) of 1.20 X 1024 molecules of glucose (C6H12O6)?

Learning Check!Learning Check!

How many atoms of O are present in 78.1 g of oxygen?

Quiz Wednesday!Quiz Wednesday!

Be prepared!