Prelim Flashcards
Three states of matter?
Solid, liquid, gas.
Anything that takes up space and has mass.
Matter.
Refers to the quantity of matter regardless of volume and forces acting on it?
Mass.
Measure of force of gravity acting on a body.
Weight.
Building blocks of matter.
Atoms.
How many elements are there according to Bushong 2008?
112
How many elements are naturally occuring?
92
How many elements are artificially produced?
20.
How are artificially produced elements made?
In high particle accelerators.
Four substances greeks believed in.
Water, air, earth and fire.
Modifiers of the Greek substances.
Hot, dry, wet, cold.
What was the Greek perspective on atoms?
All matter was composed of four substances. Earth, air, water and fire.
When did Democritus make his theory known?
400 BC.
What was Democritus’ atomic theory?
Matter could only be divided to a certain point, the smallest piece is called atomos.
Latin word meaning undivisible.
Atomos.
Meaning of atomos?
Undivisible.
Democritus believed atoms were.
Small hard particles all made from the same material but were different shapes and sizes.
When did John Dalton lay the foundation for the modern atomic theory?
1808.
What was Dalton’s atomic theory?
Elements are made of extremely small particles called atoms. Which can’t be subdivided, created or destroyed. They have identical size, mass and other properties. They could combine, separate or be rearranged because of hooks and eyes.
Who are the two eminent philosophers.
Plato and Aristotle.
When did Plato and Aristotle let their theory be known?
350BC.
What principal did Plato and Aristotle believe?
Earth, air, wind and fire.
How many years was the Democritean atomic theory burried?
Approx 2000 years.
What was the law of Multiple Proportions.
When chemical elements combine they do so in a ratio of small whole numbers.
Who discovered the Law of Multiple Proportions?
John Dalton.
Joseph John Thomson investigated what rays.
Cathode rays.
Cathode rays are also known as?
Electrons.
What was Joseph John Thompson’s theory?
Electrons were an integral part of all atoms.
Model Joseph John Thompson proposed.
Plum Pudding model
When did John Dalton discover his Law of multiple proportions?
1803.
Alternative name to electron?
Corpuscle.
When did Rutherford disprove Thompsons model of the atom?
1911.
What was the name of Rutherfords model of the atom?
Nuclear model.
Who was the Danish scientist who proposed that each electron had a specific energy level or shell?
Niels Bohr.
When did Niels Bohr come up witht he planetary model?
1913.
The model Niels Bohr came up with in 1913?
The Planetary Model.
Located a certain distance from the nucleus where electrons travel in distinct paths?
Orbitals or energy levels.
Who proposed the Particle Wave Duality model?
Louis de Broglie.
Theory proposed by Louis de Broglie?
Particle Wave Duality.
Properties of a wave?
Frequency, wavelength and energy.
Who inspired the development of wave mechanics?
Louis de Broglie.
When did Louis de Broglie win the nobel prize.
1929.
Who was the Austrian physicist who used mathematical equations to describe the likelyhood of finding an electron in a certain position?
Erwin Schrödinger.
When did Erwin Schrödinger come up with his model of the atom?
1926.
Who created the quantum mechanical model?
Erwin Schrödinger.
Predicts the probability of the location of the electron as it moves around in the electron cloud?
Quantum Mechanical Model.
Which model introduced the concept of sub energy levels?
Quantum mechanical model.
What model is based off the principal of wave mechanics.
Wave model.
“Electrons do not move about an atom in a definite path.”
Wave model.
What factor determines the probable location of an electron?
How much energy it has.
Who created quantum mechanics?
Werner Heisenberg
When was Werner Heisenberg awarded the Nobel Prize?
1932.
Particle position cannot be known simultaneously. Electrons have little mass allowing it ti have a large cloud. Protons have a much higher mass and a larger cloud. When they come together they form a small nucleus surrounded by a large cloud.
Quantum mechanics.
Diameter of atoms?
0.1 to 0.5 nanometers. (1 x 10 ^-10 - 5 x 10 ^-10).
