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Atomic Theory & Electrostatic Charges – Chemis ...

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  • Which part of the atom is responsible for chemical reactions?
    Electrons
    Nucleus
    Neutrons
    Protons
  • Who developed the modern atomic theory?
    Niels Bohr
    John Dalton
    Ernest Rutherford
    J.J. Thomson
  • What force holds matter together at the atomic level?
    Inertia
    Electromagnetism
    Gravity
    Nuclear fission
  • Why was Thomson’s discovery important?
    It disproved electricity
    It showed atoms have no charge
    It found neutrons
    It proved atoms have smaller particles
  • What is an inference in science?
    A physical law
    A laboratory error
    A conclusion based on indirect observations
    A direct measurement
  • Why are electrons important in chemistry?
    They determine bonding and reactivity
    They give mass to atoms
    They form the nucleus
    They make up protons
  • What does the scanning tunneling microscope allow us to do?
    Create atoms
    Split atoms
    Weigh atoms
    See individual atoms
  • What is an anion?
    A neutral atom
    An atom that lost electrons
    A proton
    An atom that gained electrons and became negative
  • What happens to an atom that gains electrons?
    It splits in half
    It becomes positively charged
    It becomes negatively charged
    It becomes neutral
  • What law says atoms are neither created nor destroyed in a chemical reaction?
    Law of Conservation of Matter
    Atomic Mass Law
    Theory of Relativity
    Law of Definite Proportions
  • What model of the atom did Thomson propose?
    Plum pudding model
    Planetary model
    Nuclear model
    Quantum model
  • What did Thomson’s experiments show about the atom?
    It has only positive charges
    It has a nucleus of protons
    It is indivisible
    It contains negatively charged electrons
  • What is Brownian motion evidence of?
    Sound waves
    Gravity
    Magnetism
    The existence of atoms
  • What is an atom?
    A molecule
    The smallest particle of an element that retains its identity
    A proton
    A compound
  • What are atoms called when they lose electrons?
    Cations
    Isotopes
    Neutrons
    Anions
  • What did Dalton’s experiments with gases show?
    Electrons move freely
    Atoms can be divided
    Matter combines in constant ratios
    Protons change mass
  • Who confirmed atomic theory using mathematical proof of motion?
    Ernest Rutherford
    Albert Einstein
    Niels Bohr
    Isaac Newton
  • What charge does an electron have?
    Positive
    Negative
    No charge
    Neutral
  • What charge does a proton have?
    Negative
    Positive
    Zero
    Neutral
  • Who first suggested that matter is made of tiny particles called atomos?
    Thomson
    Democritus
    Aristotle
    Dalton
  • What happens when two like charges come near each other?
    They neutralize
    They repel
    They form a bond
    They attract
  • What does the law of definite proportions state?
    Atoms can be created or destroyed
    Energy equals mass times velocity
    A compound always contains the same elements in the same ratio
    All matter is continuous
  • What part of Dalton’s atomic theory is no longer true?
    Atoms combine in whole-number ratios
    Atoms of each element are identical
    Atoms cannot change in chemical reactions
    Atoms are indivisible
  • What happens when opposite charges come near each other?
    They disappear
    They repel
    They attract
    They explode
  • What does a positively charged ion attract?
    An isotope
    A negatively charged ion
    Another cation
    A neutral atom
  • What was the nickname for Thomson’s atomic model?
    Planetary model
    Plum pudding model
    Bohr model
    Quantum model
  • What is empirical evidence?
    Mathematical theory only
    Information guessed from models
    Unproven idea
    Information gained through observation and experiment
  • What are atoms called when they gain electrons?
    Cations
    Isotopes
    Anions
    Neutrons
  • Who measured the charge of an electron with the oil-drop experiment?
    J.J. Thomson
    Ernest Rutherford
    Isaac Newton
    Robert Millikan
  • What is a theory in science?
    A well-tested explanation based on evidence
    An untested guess
    An observation
    An assumption
  • What is a cation?
    A neutral molecule
    An atom with no charge
    An atom that gained electrons
    An atom that lost electrons and became positive
  • Who discovered the electron?
    John Dalton
    J.J. Thomson
    Ernest Rutherford
    Niels Bohr
  • What instrument did Thomson use in his discovery?
    Telescope
    Microscope
    Electrostatic wand
    Cathode ray tube
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