The Final Chem 2B flash card reminder

Question 1

Molality

Answer 1

Moles of solute/ mass of solvent

Question 1

Molarity

Answer 1

moles of solvent or solute/volume (L)

Question 2

When the question is asking for particular mole fraction of molecule above the solution we use…

Answer 2

XaVap = Pa/Ptot

Question 3

Mass percent

Answer 3

Mass of solute/ Total mass of compound

Question 4

Calculating boiling point

Answer 4

Change in Temperature: T(solution) + T(pure solution)

Question 5

Freezing point

Answer 5

Change in temperature: T(pure-solvent) + (T solution)

Question 6

Heat capacity equation

Answer 6

q= mCsp( change in Temperature)

Question 7

London Dispersion forces

Answer 7

The less electronegativity the less polar the greater the London dispersion forces

Remember the higher EN: HF

Question 8

Determining Volatility

Answer 8

• Lighter molar weight = higher volatility
• Non-polars have low intermolecular forces: high volatility 1
• Polar molecules have stronger intermolecular forces: meaning lower volatility

Question 9

Dipole moment:

Answer 9

Large dipole moments determined by forces. Greatest to least forces
Ionic>dipole-dipole> Hydrogen bonds >London dispersion

Question 10

Ionic bonding

Answer 10

between a metal and non metal

Question 11

Cohesion and adhesive in hydrogen bonding

Answer 11

Cohesion water sticks to each other
Adehsive water molecules stick onto surfaces

Question 12

MO diagram structure P orbitals

Answer 12

Anything from Oxygen to the left is 2,1,2,1
Anything from Oxygen to the right is 1,2,2,1

Question 13

When to convert Celsius to Kelvin and when not to convert Celsius to Kelvin

Answer 13

when it includes R: Convert Celsius to Kelvin
When its Thermochem question like finding Q rxn just leave the temperature to celcieus C.

Question 14

ppm

Answer 14

1/10^6

Question 15

volume times density

Answer 15

mass

Question 16

mass times density =

Answer 16

volume

Question 17

Finding Volume

Answer 17

mass/density