Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
30 Cards in this Set
- Front
- Back
|
What is the Quantum Mechanical Model?
|
It explains the properties of atoms by treating the electron as a wave and quantizing its energy.
|
|
|
What is Heisenburg's Uncertainty Principle?
|
The position and momentum of a moving object cannot simoultaneously be measured and known exactly.
|
|
|
What are Matter Waves?
|
Wavelike behavior of Particles
|
|
|
What is the Dual Nature of Energy?
|
Light has the properties of both particles and waves.
|
|
|
What is Planck's Theory?
|
Energy emitted or absorbed by any object is restricted to quanta of particular sizes.
|
|
|
What is the Photoelectric Effect?
|
Shows that light in the form of a photon can collide with an electron.
|
|
|
What is a photon?
|
Quanta of energy that behave like tiny particles.
|
|
|
Why does radioactive decay occur?
|
The original nucleus of an atom decomposes or decays to form a new nucleus, releasing radiation in the process.
|
|
|
What are the four properties of waves?
|
Frequency, Amplitude, Speed, Wavelength
|
|
|
What did Democritus do for Chemistry?
|
He originated the idea of the atom.
|
|
|
What did Dalton do for Chemistry?
|
He developed the Atomic Theory of Matter.
|
|
|
What is the Atomic Theory of Matter?
|
An element is made up of atoms
Atoms of a given element are identical Atoms of different elements are different Atoms are neither created or destroyed a given compound has the same relative numbers and types of atoms. |
|
|
What did Thomson contribute to Chemistry?
|
He discovered the electron using a cathode ray tube.
|
|
|
What did Franklin contribute to Chemistry?
|
Observed electricity. Said an object can have one of two kinds of electric charge (positive or negative).
|
|
|
What did Bequerel contribute to Chemistry?
|
He worked with radioactive pitchblende.
|
|
|
What did the Curies contribute to Chemistry?
|
They discovered Polonium, Radium.
|
|
|
What did Rutherford Contribute to Chemistry?
|
1. Atom is mostly empty space
2. Atom contains a small, dense nucleus |
|
|
What did Chadwick contribute to Chemistry?
|
He discovered the neutron.
|
|
|
What are protons?
|
They have a positive charge, are located in the nucleus, and are "glued" together by neutrons.
|
|
|
What are neutrons?
|
They have no charge, and are located in the nucleus.
|
|
|
What are electrons?
|
They have a negative charge, and are located in the empty space of an atom.
|
|
|
What is an Ion?
|
Charged atoms (an un-equal number of electrons and protons).
|
|
|
What is a cation?
|
Represented by a plus sign. Is when you lose electrons.
|
|
|
What is an anion?
|
Represented by a minus sign. Is when you gain electrons.
|
|
|
What is an isotope?
|
Atoms with a different number of protons and neutrons (There CAN be a charge).
|
|
|
What is amu?
|
The mass of both a single proton and a neutron is 1 amu.
|
|
|
What is the strong nuclear force?
|
When neutrons glue protons together in the nucleus.
|
|
|
What is the Zone of Stability?
|
Elements with atomic numbers between 1 and 20 have stable nuclei with nearly equal amounts of protons and neutrons.
|
|
|
What is electron denstiy?
|
The density of an electron cloud.
|
|
|
What are atomic orbitals?
|
A region in space where an electron with a particular energy is likely to be found.
|
