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