Models, theories and laws

Question 1

The Bohr model

Answer 1

Electrons travel around the nucleus in circular orbits that are fixed distance for that particular electron. Bohr orbits are quantified by a quantum number n=1,2,3, energy of each orbit increases the further away the orbit is from the nucleus, but the levels become more closely spaced.

Question 2

Hund’s rule

Answer 2

When filling orbitals of equal energy, electrons fill them singly first, with parallel spins.

Question 3

Pauli exclusion principle

Answer 3

Orbitals can hold no more than 2 electrons and they must have apposing spins.

Question 4

Neonates Lowry

Answer 4

An acid is a proton h+ donor

A base is a proton h+ acceptor

Question 5

Arrhenius defenition

Answer 5

An acid produces h+ ions in solution

A base produces OH- ions in solution.

Question 6

Accuracy

Answer 6

How close a measured number is to zero

Question 7

Precision

Answer 7

How close a number is to other measured numbers.