Chemistry: Atoms and Bonding Quiz
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Questions and Answers

How many total atoms are represented in the formula 3CaCl₂?

  • 6
  • 12
  • 15
  • 9 (correct)

    • What is the total number of sulfur atoms in 4K₂SO₄?

  • 4 (correct)
  • 12
  • 8
  • 2

    • When counting atoms in 5Fe₂O₃, what is the total number of oxygen atoms?

  • 30
  • 10
  • 5
  • 15 (correct)

    • How many hydrogen atoms are there in the expression 3H₂SO₄?

    <p>6</p> Signup and view all the answers

    In the molecule 2C₂H₆, how many total carbon atoms are present?

    <p>6</p> Signup and view all the answers

    What is the main characteristic of covalent bonds as described?

    <p>They occur between nonmetals and involve sharing valence electrons.</p> Signup and view all the answers

    Which of the following is true about the valence electrons indicated by an element's group number?

    <p>Elements in the same group have the same number of valence electrons.</p> Signup and view all the answers

    What happens to the metal atom in an ionic bond?

    <p>It donates electrons, becoming a positively charged ion.</p> Signup and view all the answers

    Which pair of elements would most likely form an ionic bond?

    <p>Sodium and Chlorine</p> Signup and view all the answers

    What characteristic distinguishes ionic compounds from covalent compounds?

    <p>Covalent compounds generally have higher melting points.</p> Signup and view all the answers

    Which of the following statements accurately describes groups of elements and their valence electrons?

    <p>Atoms in Group 15 have 5 valence electrons.</p> Signup and view all the answers

    What is the primary reason that noble gases do not typically form bonds?

    <p>They possess 8 valence electrons in their outer shell.</p> Signup and view all the answers

    How do metals generally behave in terms of electron transfer in bonding?

    <p>They lose electrons to become positively charged ions.</p> Signup and view all the answers

    What distinguishes transition metals from main group elements regarding their valence electron configurations?

    <p>Their valence electron configurations are not usually discussed in lower education levels.</p> Signup and view all the answers

    What defines an ion in the context of chemical bonding?

    <p>An ion is an atom with a net electrical charge due to the loss or gain of electrons.</p> Signup and view all the answers

    What is the purpose of adding coefficients in a chemical equation?

    <p>To balance the number of atoms of each element on both sides.</p> Signup and view all the answers

    Which of the following is a correctly balanced equation?

    <p>N₂ + 2H₂ → 2NH₃</p> Signup and view all the answers

    Which step is NOT included in the process of balancing a chemical equation?

    <p>Change the subscripts as necessary.</p> Signup and view all the answers

    In the example reaction N₂ + 3H₂ → 2NH₃, how many hydrogen atoms are present in the products?

    <p>6</p> Signup and view all the answers

    What is the first step in balancing a chemical equation?

    <p>Count the atoms of each element present.</p> Signup and view all the answers

    What is a crucial step in balancing a chemical equation?

    <p>Adding coefficients to balance the elements</p> Signup and view all the answers

    In the equation N₂ + H₂ → NH₃, which coefficients are necessary to balance it correctly?

    <p>1, 3, 2</p> Signup and view all the answers

    How do you check your work after balancing a chemical equation?

    <p>Ensure the total mass of reactants equals the total mass of products</p> Signup and view all the answers

    Which of the following equations is balanced correctly?

    <p>C + 2H₂ → CH₄</p> Signup and view all the answers

    What mistake should be avoided when balancing chemical equations?

    <p>Increasing the number of molecules without justification</p> Signup and view all the answers

    How many total atoms are present in the formula 3 C₆H₁₂O₆?

    <p>36 atoms</p> Signup and view all the answers

    In the chemical equation 2 H₂ + O₂ → 2 H₂O, how many total oxygen atoms are involved in the reaction?

    <p>2 atoms</p> Signup and view all the answers

    What is the total number of atoms in the formula 3 CaCl₂?

    <p>9 atoms</p> Signup and view all the answers

    In the formula 4 K₂SO₄, how many sulfur atoms are there in total?

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

    If the formula 5 Fe₂O₃ is given, how many total iron atoms are there?

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

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