Share Atomic Theory & Electrostatic Charges – Chemistry A
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Who first suggested that matter is made of tiny particles called atomos?
Democritus
Dalton
Aristotle
Thomson
Who developed the modern atomic theory?
John Dalton
Niels Bohr
Ernest Rutherford
J.J. Thomson
What is a theory in science?
A well-tested explanation based on evidence
An untested guess
An assumption
An observation
What is an atom?
The smallest particle of an element that retains its identity
A compound
A molecule
A proton
What is empirical evidence?
Unproven idea
Mathematical theory only
Information gained through observation and experiment
Information guessed from models
What is an inference in science?
A conclusion based on indirect observations
A direct measurement
A laboratory error
A physical law
What law says atoms are neither created nor destroyed in a chemical reaction?
Law of Conservation of Matter
Law of Definite Proportions
Atomic Mass Law
Theory of Relativity
What does the law of definite proportions state?
Energy equals mass times velocity
All matter is continuous
Atoms can be created or destroyed
A compound always contains the same elements in the same ratio
Who discovered the electron?
J.J. Thomson
Ernest Rutherford
John Dalton
Niels Bohr
What instrument did Thomson use in his discovery?
Electrostatic wand
Telescope
Microscope
Cathode ray tube
What did Thomson’s experiments show about the atom?
It is indivisible
It has only positive charges
It contains negatively charged electrons
It has a nucleus of protons
What model of the atom did Thomson propose?
Plum pudding model
Planetary model
Quantum model
Nuclear model
What happens when two like charges come near each other?
They neutralize
They repel
They form a bond
They attract
What happens when opposite charges come near each other?
They explode
They attract
They disappear
They repel
What are atoms called when they lose electrons?
Anions
Isotopes
Neutrons
Cations
What are atoms called when they gain electrons?
Anions
Isotopes
Neutrons
Cations
