quiz 2 Flashcards
Law of Conservation of Mass (or Matter)
- In a chemical reaction, matter is neither created or
destroyed
Law of Definite Proportions
A compound always contains the same elements in
the same proportions by mass regardless of origin
Law of Multiple Proportions
When 2 elements react to form more than one
compound, a fixed mass of one element will react
with masses of the other element in a ratio of small,
whole numbers
Dalton’s Atomic Theory 1
Matter is composed of tiny, indestructible particles
called atoms
Dalton atomic theory 2
All atoms of a given element have the same mass and
other properties
atomic theory 3
Atoms of one element differ in properties from atoms
of all other elements
atomic theory 4
Atoms combine in simple, whole-number ratios to
form compounds.
atomic theory 5
Atoms are neither created nor destroyed during a
chemical change, but atoms are rearranged to yield
substances that are different.
JJ Thomson,
Cathode Ray Tube Experiment
Nagaoka
Saturn-ring Model
JJ Thomson model
Plum-Pudding Model
Robert Millikan
Oil Drop Experiment
Ernest Rutherford
Gold Foil Experiment
Nuclear Theory of arom
Most of mass and all positive charge are in the nucleus.
2. Most of volume is empty space but electrons are dispersed
throughout this space.
3. There are as many negative particles (electrons) as positive
particles (protons)
Frederick Soddy,
Discovery of isotopes - atoms of the same element CAN differ in mass!
