Chemistry: Molar Mass and Ionic Compounds
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Questions and Answers

What is the definition of molar mass?

  • The mass of one mole of any substance in ounces
  • The total mass of all atoms in a molecule in grams
  • The weight of a molecule in kilograms
  • The molecular weight in grams (correct)

    • Which process results in the formation of a cation?

  • Combining two atoms
  • Adding an electron to an atom
  • Gaining a neutron
  • Removing an electron from an atom (correct)

    • What type of molecule is represented by S8?

  • Monatomic molecule
  • Cation
  • Polyatomic molecule (correct)
  • Diatomic molecule

    • What charge does an anion carry?

    <p>Negative charge</p> Signup and view all the answers

    How is a cation formed?

    <p>By losing one or more electrons</p> Signup and view all the answers

    What is the common charge on a magnesium ion?

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

    Which of the following is an anion derived from fluorine?

    <p>-1</p> Signup and view all the answers

    What happens to a nonmetal when it forms an anion?

    <p>8</p> Signup and view all the answers

    What is the formula for the ion formed by nitrogen in Group 5A?

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

    Which statement is true about transition metals in terms of ion formation?

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

    Which polyatomic ion is commonly known for having a charge related to oxygen?

    Signup and view all the answers

    What type of elements are typically involved in ionic compounds?

    <p>A combination of metals and nonmetals</p> Signup and view all the answers

    In the empirical formula of ethanol, C2H6O, what is the percentage composition of hydrogen?

    <p>13.15%</p> Signup and view all the answers

    What is the weight percent of nitrogen in nitrogen dioxide (NO2)?

    <p>30.4%</p> Signup and view all the answers

    If the molar mass of NO2 is 46.0 g, what is the contributing weight mass of oxygen in the formula?

    <p>32.0 g</p> Signup and view all the answers

    For nitrogen monoxide (NO), what is true about its molecular composition?

    <p>It consists of one mole of nitrogen and one mole of oxygen.</p> Signup and view all the answers

    What is the percent by weight of oxygen in nitrogen dioxide (NO2)?

    <p>69.6%</p> Signup and view all the answers

    What is the main criterion for a pure compound in terms of molecular composition?

    <p>It must consist of elements in the same proportions by weight.</p> Signup and view all the answers

    How many grams of nitrogen are present in one mole of nitrogen dioxide (NO2)?

    <p>14.0 g</p> Signup and view all the answers

    What determines the attractive force between oppositely charged ions in ionic compounds?

    <p>Electrostatic forces governed by Coulomb’s Law</p> Signup and view all the answers

    According to Coulomb’s Law, what happens to the attractive force as ion charge increases?

    <p>The attractive force increases</p> Signup and view all the answers

    What occurs to the attractive force between ions as the distance between them increases?

    <p>The attractive force decreases</p> Signup and view all the answers

    What is the melting point of NaCl, and how does it compare to that of MgO?

    <p>MgO has a higher melting point than NaCl</p> Signup and view all the answers

    Which of the following compounds is an example of molecular compounds formed from nonmetals?

    <p>CO2</p> Signup and view all the answers

    Which of the following statements is true regarding ionic and molecular compounds?

    <p>Ionic compounds are held together by electrostatic forces</p> Signup and view all the answers

    What is the melting point of NaCl?

    <p>804 °C</p> Signup and view all the answers

    Which of the following is not a characteristic of ionic compounds?

    <p>They consist solely of nonmetals</p> Signup and view all the answers

    What ions do metals typically form when they lose electrons?

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

    Which nonmetal ion is derived from Group 6A and carries a charge of -2?

    <p>O2-</p> Signup and view all the answers

    How many electrons does a nonmetal from Group 7A typically gain to form an anion?

    <p>1</p> Signup and view all the answers

    What is the charge of an aluminum ion when it forms?

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

    What is the stem for the ion formed by carbon in Group 4A?

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

    Which polyatomic ion is most commonly known for having a charge related to nitrogen?

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

    What typically distinguishes ions with names ending in -ate from those ending in -ite?

    <p>The number of oxygen atoms</p> Signup and view all the answers

    Which of the following transition metals can commonly form a +2 or +3 ion?

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

    How many nitrogen atoms are present in one molecule of glycine?

    <p>1</p> Signup and view all the answers

    Which formula correctly denotes the atom ordering in glycine?

    <p>H2NCH2COOH</p> Signup and view all the answers

    What is the molecular weight of glycine based on its molecular formula?

    <p>89.09 g/mol</p> Signup and view all the answers

    Which of the following structural representations is used for glycine?

    <p>H-N-C-C-O-H</p> Signup and view all the answers

    How many total carbon atoms are present in one molecule of glycine?

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

    What is the empirical formula of a compound composed of B and H that is 81.10% B?

    <p>B2H5</p> Signup and view all the answers

    If the empirical formula of a compound is B2H5, what could be a possible molecular formula?

    <p>B4H10</p> Signup and view all the answers

    How is the molecular formula determined from the empirical formula?

    <p>By finding the molar mass and comparing it to the empirical formula mass</p> Signup and view all the answers

    What is the empirical formula mass of B2H5?

    <p>26.66 g/mol</p> Signup and view all the answers

    What is the first step to finding the molecular formula of a compound, given its empirical formula B2H5?

    <p>Conduct experiments to find the molar mass</p> Signup and view all the answers

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