Chem 12

Roman Numerals

100

FeCl₂

Iron II

200

MnO₂

Manganese IV

300

FeF₃

Iron III

400

CuS

Copper II

500

Cr₂O₃

Chromium III

Polyatomic Ions

100

NO₃^-1

Nitrate

200

OH^-1

Hydroxide

300

SO₄^-2

Sulfate

400

NH₄⁺¹

Ammonium

500

CO₃^-2

Carbonate

Half Life

100

T_1/2 = 3 hrs  ... How much substance X will be left if 20 grams initially sat on the shelf for 9 hrs ?

2.5 g

200

T_1/2 = 10 min  ... How much substance X will be left if 100 grams initially sat on the shelf for 40 minutes ?

6.25 g

300

T_1/2 = 20 yr ... How much substance X will be left if 1000 grams initially sat on the shelf for 60 days ?

125 g

400

T_1/2 = 10 sec ... How much substance X will be left if 1000 grams initially sat on the shelf for 50 sec ?

31.25

500

T_1/2 = 5730 yrs  ... How much C-14 will be left if 1g gram was buried for 32,380 yrs ?

0.015625 g

Colligative Properties

100

Solutes ____ the boiling point of solutions

increase (elevates)

200

Solutes ____ the freezing point of solutions

decreases (depresses)

300

Solutes ____ the osmotic pressure of a solution

increases

400

The van Hoff factor (i) for NaCl is ____

2

500

The van Hoff factor (i) for MgCl₂ is _______

3

Vapor Pressure

100

VP = atm

Boiling

200

VP_solid > VP_liquid

Liquid 

300

VP_solid = VP_liquid

Melting

400

VP_solid < VP_liquid

Solid

500

VP_solid = atm

Sublimation