Atoms, Molecules and Ions Chapter 2
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Questions and Answers

What is the fundamental unit of an element that can participate in chemical reactions?

  • Atom (correct)
  • Ion
  • Compound
  • Molecule

    • What is the term for the dense central core within an atom?

  • Proton
  • Molecule
  • Nucleus (correct)
  • Electron

    • According to Dalton's atomic theory, what happens to atoms during a chemical reaction?

  • Atoms are only separated
  • Atoms are rearranged or combined (correct)
  • Atoms are created or destroyed
  • Atoms are only combined

    • What is the characteristic of atoms of the same element?

    <p>Same size, mass, and chemical properties</p> Signup and view all the answers

    What is the composition of compounds?

    <p>Atoms of more than one element</p> Signup and view all the answers

    What is the distinguishing characteristic of a cation?

    <p>It has a net positive charge</p> Signup and view all the answers

    Which of the following is an example of a polyatomic molecule?

    <p>H2O</p> Signup and view all the answers

    What is the term for an ion with a negative charge?

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

    Which of the following groups of elements are classified as reactive metals?

    <p>1A, 2A, 3A (unless H)</p> Signup and view all the answers

    What is the term for a molecule that contains only two atoms?

    <p>Diatomic molecule</p> Signup and view all the answers

    What is the term for an ion that contains only one atom?

    <p>Monatomic ion</p> Signup and view all the answers

    What is the number of electrons in the ion 27 3+ Al?

    <p>10</p> Signup and view all the answers

    What is the formula of an ionic compound that consists of a combination of cations and anions?

    <p>The same as the empirical formula</p> Signup and view all the answers

    What is the characteristic of neutrons in the nucleus?

    <p>Electrically neutral</p> Signup and view all the answers

    What is the definition of an acid?

    <p>A substance that yields hydrogen ions (H+) when dissolved in water</p> Signup and view all the answers

    What is the formula for calculating the mass number of an atom?

    <p>Number of protons + number of neutrons</p> Signup and view all the answers

    What is the difference between an ionic compound and a molecular compound?

    <p>Ionic compounds are formed between metals and nonmetals, while molecular compounds are formed between nonmetals</p> Signup and view all the answers

    Where can metalloids be found in the periodic table?

    <p>Between metals and nonmetals</p> Signup and view all the answers

    What is the definition of isotopes?

    <p>Atoms of the same element with different numbers of neutrons</p> Signup and view all the answers

    What is the definition of an oxoacid?

    <p>An acid that contains hydrogen, oxygen, and another element</p> Signup and view all the answers

    Where can nonmetals be found in the periodic table?

    <p>On the right side of the periodic table</p> Signup and view all the answers

    What is the sum of the charges on the cation(s) and anion(s) in each formula unit of an ionic compound?

    <p>0</p> Signup and view all the answers

    What is a characteristic of all metals?

    <p>They are all luster and have high electric and heat conductivity</p> Signup and view all the answers

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