practice test chem 3

Kinetic molecular Theory

Temp stays the same energy is same, collisions when they hit have same energy, All molecules have same velocity meaning same speed.

When finding molar mass do not round till the end

Take the same molar mass from periodic table

1 in= ? cm 1cm= ? mm

2.54 and 10

Moles to moles

Use ratio no need for molar mass

Absolute zero

-273 C / 0 K

The more carbon it has

The bigger the stronger

You need names

Remember how to write names and atoms

Ionic crystalline solid

Look for metal non metal

Intermolecular Forces (IMF)

IMF is the pull between neighbors, not the bond inside.

Forces

Hydrogen Bonding (Strongest):

Dipole-Dipole (Medium)

London Dispersion (Weakest)

London Dispersion (Weakest): Every single molecule has this. It’s a very weak, temporary pull.

2. Dipole-Dipole (Medium): Happens in polar molecules that have a "positive end" and a "negative end."

3. Hydrogen Bonding (Strongest): This is the "Super Glue." It only happens when Hydrogen is bonded directly to F, O, or N.

Vapor Pressure

Vapor Pressure (The pressure caused by molecules "jumping" out of the liquid and becoming a gas).

Boiling point

High vapor pressure = Low boiling point

👉 Low vapor pressure = High boiling point

PV=nRT

👉 n = amount of gas in moles

Polar and non polar

• O, F, N = usually polar

• Only C + H = nonpolar

CuSO₄ · 5H₂O

Copper(II) sulfate pentahydrate