Sticky Notes Sticky Notes

IB Chemistry HL

by
EJ
Electronegativity

March 13, 2025

A measure of the ability of an atom to attract electrons in a covalent bond.

OIL RIG

March 13, 2025

- Oxidation is the loss of electrons + addition of oxygen, removal of hydrogen, increase in oxidation state.

- Reduction is the gain of electrons + removal of oxygen, addition of hydrogen, decrease in oxidation state

Ligands

March 13, 2025

- A species that uses a lone pair of electrons to form a coordination bond with a metal ion.
Charges of ligands are in data booklet
- H20 and NH3 -> Neutral atom (0 charge)
- Cl, CN, and OH -> -1 charge

IR Active

March 13, 2025

A bond in a diatomic molecule only interacts with IR if it is polar. Non-polar diatomic molecules will not absorb the radiation.

Kelvin and Celsius

March 13, 2025

1 degree change in Kelvin = 1 degree change in celsius

Enthalphy Change Percision

March 13, 2025

The precision of temperature measurements limits the accuracy of the answer.
The actual value may be lower than the estimate due to heat loss and incomplete combustion.

Ferromagnetics

March 15, 2025

Iron, cobalt and nickel.
Have unpaired electron in d orbitals leading to net magnetic moment.