Lesson 1 Flashcards
(53 cards)
_________- closeness of measurements
ACCURACY
_________- closeness of set measurements
PRECISION
_________- commonly accepted value
PERCENTAGE ERROR
_________- does not involve a change.
PHYSICAL
_________- converted into different substances
CHEMICAL
__________- observed with the senses
PHYSICAL PROPERTY
_________- how a substance reacts with something
CHEMICAL PROPERTY
_________- 3 starter of Matter
solid , Liquid, and Gas.
_________- Particles packed very closely together
SOLID
_________- Particles packed more loosely, but still together”
LIQUID
_________- particles are “far apart”
Gas
_________- Fixed composition
PURE SUBSTANCE
_________- only one kind of atom
ELEMENT
_________- chemically bonded
COMPOUND
_________- can be classified as either a substance / mixture.
MATTER
1st used term “atom” - _________ _____BC
Demoentus (400BC)
_________- A major ideas, Model of an Atom
It is often referred to as the “billiard ball” model. He defined an atom to be a ball-like structure, as the concepts of atomic nucleus and electrons were unknown at the time.
Dalton’s model (1803)
The _________ model postulates that “electrons orbit the nucleus at fixed energy levels.”
Bohr’s model
_________- Discover Protons (1886)
Eugene Goldstein
_________- Discover electron. He called his atom the plum pudding model.
Thomson’s model (1897) -
_________- “gold foil” experiment.
Rutherford’s model (1911)
_________- discovers charge of Mass of an electron (1919)
Robert Millikan
_________- discovered Neutrons (1932)
Sir James Chadwick
_________- Particle-wave duality. He introduced the idea that particles, such as electrons, could be described not only as particles but also as waves.
Louis de Broglie
