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AP Chemistry Atoms, Molecules, and Ions — practice questions

Explore 22 free Atoms, Molecules, and Ions questions in AP Chemistry Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Atoms, Molecules, and Ions questions and exercises with answers

Showing questions 1–22 of 22.

Dalton's atomic theory was first published in:Read the answer and worked solution →Aristotle held that matter was made from four elements: fire, earth, water and:Read the answer and worked solution →Thomson's cathode ray particle is now known as the:Read the answer and worked solution →Atoms of the same element that differ in mass are called:Read the answer and worked solution →The unified atomic mass unit is defined as exactly one twelfth of the mass of one atom of:Read the answer and worked solution →The law of definite proportions is also known as the law of:Read the answer and worked solution →Because atoms are neither created nor destroyed in a chemical change, the total mass present:Read the answer and worked solution →Millikan's oil drop experiment measured the electron's:Read the answer and worked solution →Rutherford concluded that most alpha particles passed through gold foil undeflected because they travelled through:Read the answer and worked solution →The discovery of the neutron explained isotopes because isotopes differ in:Read the answer and worked solution →Where in an atom is most of the mass concentrated, and where is most of the volume?Read the answer and worked solution →The diameter of an atom is about how many times larger than the diameter of its nucleus?Read the answer and worked solution →A compound, in Dalton's terms, consists of atoms of two or more elements combined in:Read the answer and worked solution →An element such as copper cannot be broken into simpler substances because it consists of:Read the answer and worked solution →Thomson determined which quantity for the electron?Read the answer and worked solution →Copper and chlorine form compounds at 0.558 g and 1.116 g of chlorine per gram of copper, a ratio of:Read the answer and worked solution →Match each scientist to their findingRead the answer and worked solution →Sort each particle by its placeRead the answer and worked solution →True or false: atomic theoryRead the answer and worked solution →Complete the three mass lawsRead the answer and worked solution →Work the atomic numbersRead the answer and worked solution →Which one does not belong?Read the answer and worked solution →

Worked practice questions

Dalton's atomic theory was first published in:

  1. 1807
  2. 1707
  3. 1907
  4. 1607
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Correct answer: A. 1807

1. Dalton set out a set of hypotheses about the microscopic features of matter. 2. First published in 1807, many of those hypotheses are still valid in modern atomic theory. 3. They replaced the older idea that matter could be divided without limit. 4. The nineteenth century opening date is what places atomic theory before the discovery of the electron. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 2 'Atoms, Molecules, and Ions', sections 2.1-2.6_

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Aristotle held that matter was made from four elements: fire, earth, water and:

  1. Iron
  2. Air
  3. Ice
  4. Salt
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Correct answer: B. Air

1. Early Greek thinking listed a small number of fundamental substances. 2. Aristotle and others came to the conclusion that matter consisted of various combinations of the four elements. 3. Those four were fire, earth, air and water. 4. They also believed matter could be infinitely divided, which Dalton later denied. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 2 'Atoms, Molecules, and Ions', sections 2.1-2.6_

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Thomson's cathode ray particle is now known as the:

  1. Electron
  2. Proton
  3. Neutron
  4. Positron
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Correct answer: A. Electron

1. Thomson's idea was controversial at the time but gradually accepted. 2. His cathode ray particle is what we now call an electron. 3. It is a negatively charged, subatomic particle with a mass more than one thousand times less than that of an atom. 4. Protons and neutrons were identified later and sit in the nucleus. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 2 'Atoms, Molecules, and Ions', sections 2.1-2.6_

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More Chemistry topics

Composition of Substances and SolutionsEquilibria of Other Reaction ClassesSolutions and ColloidsStoichiometry of Chemical ReactionsThermodynamicsAcid-Base EquilibriaChemical Bonding and Molecular GeometryElectronic Structure and Periodic Properties