Glossary of Chemistry Test II Trimester I
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- 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.
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