Evolution of the Atomic Theory in Chemistry
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Questions and Answers

Who first proposed the concept of atoms?

  • Isaac Newton
  • John Dalton
  • Leucippus and Democritus (correct)
  • Aristotle
  • What is the Greek word for 'indivisible'?

  • Elementos
  • Atomos (correct)
  • Matteros
  • Indivisiblos
  • According to Dalton's Atomic Theory, what is matter composed of?

  • Exceedingly small particles called molecules
  • Exceedingly small particles called protons
  • Exceedingly small particles called atoms (correct)
  • Exceedingly small particles called electrons
  • According to Dalton's Atomic Theory, what is the smallest unit of an element that can participate in a chemical change?

    <p>Atom</p> Signup and view all the answers

    Which Greek philosopher proposed the concept of atoms along with Leucippus?

    <p>Democritus</p> Signup and view all the answers

    What did Aristotle and others believe matter consisted of?

    <p>Various combinations of the four 'elements'</p> Signup and view all the answers

    According to Dalton’s Atomic Theory, which postulate states that atoms of one element differ in properties from atoms of all other elements?

    <p>Postulate 3</p> Signup and view all the answers

    In Dalton’s Atomic Theory, which postulate explains that a compound consists of atoms of two or more elements combined in a small, whole-number ratio?

    <p>Postulate 4</p> Signup and view all the answers

    According to the Law of Conservation of Matter (Mass), what happens during a chemical change?

    <p>The total mass of matter remains constant</p> Signup and view all the answers

    Which experiment by French chemist Joseph Proust illustrates the Law of Definite Proportions (Constant Composition)?

    <p>Constant Composition of Isooctane (C8H18)</p> Signup and view all the answers

    What does Dalton’s Atomic Theory postulate about atoms during a chemical change?

    <p>Atoms rearrange to yield different types of matter</p> Signup and view all the answers

    Which element has atoms with a characteristic mass of 55.847 atomic mass units?

    <p>Iron (Fe)</p> Signup and view all the answers

    What is the characteristic mass of Carbon atoms according to the provided text?

    <p>12 atomic mass units</p> Signup and view all the answers

    In a given compound according to Dalton's Atomic Theory, what is always present in the same ratio?

    <p>$NaCl$ molecules</p> Signup and view all the answers

    'Atoms are neither created nor destroyed during a chemical change, but instead rearrange to yield a different type(s) of matter.' Which law or postulate does this statement reflect?

    <p>'Atoms are neither created nor destroyed during a chemical change, then the total mass of matter present when matter changes from one type to another will remain constant' - Law of Conservation of Matter (Mass)</p> Signup and view all the answers

    'Every water molecule has exactly two hydrogen (H) atoms for every one oxygen (O) atom, always in a 2:1 ratio.' Which compound does this statement describe?

    <p>$H_2O$</p> Signup and view all the answers

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