Chem 20A - Midterm 1

Law of Definite Proportion

In a given substance the proportion of the mass of an element that composes it is fixed

Atomic Theory of Matter

Provides fundamental understanding of atoms, atoms are the fundamental building blocks of matter

Incorrect: Atoms are indestructible, atoms of the same element have identical mass

Law of Multiple Proportions

Two elements combine to form more than one compound the ratio of masses to element are integers

Avogardro’s Hypothesis

Equal volumes of all gases at the same temperature and pressure contain an equal number of molecules

Black Body Radiation

Proved that energy is quantized

Number of angular nodes

N-1

Number of radial nodes

n-l

Effective Nuclear Charge

When there are multiple electrons, electrons found closer to the nucleus is less shielded and have a higher effective nuclear charge, and its energy is lower