Chemistry Chapter on Lattice Energy
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Questions and Answers

What primarily determines the magnitude of lattice energy in ionic compounds?

  • The type of metal involved
  • The number of ions in the compound
  • The magnitudes of the charge and distance between the ions (correct)
  • The size of the ions

    • Which ionic compound has the highest lattice energy based on the provided data?

  • NaCl
  • LiF
  • MgO
  • ScN (correct)

    • If MgO has a lattice energy of 3890 kJ/mol, which of the following compounds would likely have a lower lattice energy?

  • CaO
  • LiI (correct)
  • LiF
  • Na2O

    • Which compound listed has a lattice energy closest to 800 kJ/mol?

    <p>NaCl (C)</p> Signup and view all the answers

    Which of the following statements is true regarding the relationship between lattice energy and ionic compound stability?

    <p>Higher lattice energy indicates greater stability (A)</p> Signup and view all the answers

    When comparing MgCl2 and NaCl, which compound will exhibit a greater lattice energy?

    <p>MgCl2 (B)</p> Signup and view all the answers

    Which of the following ionic solid compounds would most likely have a melting point above 2000 °C?

    <p>MgO (D)</p> Signup and view all the answers

    Arrange MgO, CaO, and SrO in order of increasing lattice energy.

    <p>SrO, CaO, MgO (A)</p> Signup and view all the answers

    What is the empirical formula of a compound consisting of 30.45% nitrogen and 69.55% oxygen by mass?

    <p>NO2 (B)</p> Signup and view all the answers

    What is the molar mass of nitrogen used in the calculations?

    <p>14.01 g/mol (A)</p> Signup and view all the answers

    In determining the molecular formula, what is the first step after finding the empirical formula?

    <p>Divide the molar mass by the empirical formula mass (A)</p> Signup and view all the answers

    What mass of nitrogen is contained in a 100-g sample of the compound?

    <p>30.45 g (A)</p> Signup and view all the answers

    What is the final molecular formula of the compound?

    <p>N2O4 (C)</p> Signup and view all the answers

    What process is used to reduce the subscripts in the empirical formula?

    <p>Dividing by the smallest subscript (D)</p> Signup and view all the answers

    What mass percentage of oxygen is present in the compound?

    <p>69.55% (B)</p> Signup and view all the answers

    What is the empirical formula mass for NO2?

    <p>46.01 g/mol (B)</p> Signup and view all the answers

    What is the definition of percent composition by mass in a compound?

    <p>The list of the percent by mass of each element in a compound (D)</p> Signup and view all the answers

    What is the correct calculation for the molar mass of lithium carbonate, Li2CO3?

    <p>(2 x 6.94 g) + (1 x 12.01 g) + (3 x 16.00 g) (A)</p> Signup and view all the answers

    How is the empirical formula mass of hydrogen peroxide, H2O2, obtained if using its empirical formula HO?

    <p>By summing the individual molecular weights of hydrogen and oxygen (D)</p> Signup and view all the answers

    What is the molar mass of oxygen when measured as O2?

    <p>32.00 g (A)</p> Signup and view all the answers

    What does the molar mass of an element represent?

    <p>The mass in grams of one mole of atoms of that element (C)</p> Signup and view all the answers

    How many moles of atomic oxygen are in 1 mole of O?

    <p>1 mole (B)</p> Signup and view all the answers

    What is the molecular mass of propane (C3H8)?

    <p>44.10 g/mol (D)</p> Signup and view all the answers

    Which calculation would yield the percent composition of lithium in lithium carbonate, Li2CO3?

    <p>(6.94 g / 73.89 g) x 100% (D)</p> Signup and view all the answers

    If air is approximately 21 percent oxygen by volume, what does this imply about the composition of air?

    <p>Air contains predominantly nitrogen with minor components. (D)</p> Signup and view all the answers

    What is the molar mass of water (H2O)?

    <p>18.02 g/mol (C)</p> Signup and view all the answers

    When calculating the empirical formula, what does the empirical formula represent?

    <p>The ratio of atoms in a molecule (D)</p> Signup and view all the answers

    What is necessary to convert an empirical formula into a molecular formula?

    <p>The molar mass of the compound (C)</p> Signup and view all the answers

    How is the molecular mass of a compound determined?

    <p>By summing the molar masses of the constituent elements (A)</p> Signup and view all the answers

    For every 2 moles of hydrogen that react, how many moles of O2 are required to produce water?

    <p>1 mole (C)</p> Signup and view all the answers

    What mass corresponds to 0.905 moles of sodium chloride (NaCl), given that its molar mass is approximately 58.44 g/mol?

    <p>52.89 g (D)</p> Signup and view all the answers

    How many water molecules are present in 3.26 g of water, considering its molar mass is approximately 18.02 g/mol?

    <p>0.18 moles (B)</p> Signup and view all the answers

    How is a monatomic cation named?

    <p>By adding the word ion to the name of the element. (A)</p> Signup and view all the answers

    What is the correct name for the oxoanion that has one more oxygen atom than chlorate?

    <p>Perchlorate (D)</p> Signup and view all the answers

    Which of the following correctly describes how to name a monatomic anion?

    <p>Change the ending of the element’s name to -ide. (B)</p> Signup and view all the answers

    Which of these describes an oxoacid derived from an –ite ion?

    <p>It produces one less hydrogen ion than the corresponding –ate acid. (A)</p> Signup and view all the answers

    What is the systematic name for HClO2?

    <p>Chlorous acid (B)</p> Signup and view all the answers

    What must be true about the overall charge of ionic compounds?

    <p>The sum of the charges must be zero. (D)</p> Signup and view all the answers

    When naming ionic compounds, what is important to include if the cation can have more than one charge?

    <p>A Roman numeral indicating its charge must be used. (D)</p> Signup and view all the answers

    Which of the following oxoanions has two fewer oxygen atoms than the corresponding –ate ion?

    <p>Hypochlorite (D)</p> Signup and view all the answers

    What is the name of the ionic compound represented by the formula NaBr?

    <p>Sodium bromide (B)</p> Signup and view all the answers

    Which oxoanion follows the naming convention due to having one less oxygen than the corresponding anion?

    <p>Chlorite (C)</p> Signup and view all the answers

    Which of the following represents a compound that includes a cation with a charge of +2?

    <p>CaO (B)</p> Signup and view all the answers

    What characterizes polyprotic acids?

    <p>They can produce multiple hydrogen ions. (A)</p> Signup and view all the answers

    In Lewis theory of bonding, which of the following is stated about compounds formed between non-metals?

    <p>Electrons are shared to achieve noble gas configuration. (D)</p> Signup and view all the answers

    Which of the following is true about the naming of acids based on –ate ions when dissolved in water?

    <p>They end with the suffix –ic. (C)</p> Signup and view all the answers

    What is represented by the Roman numeral in iron(III) chloride?

    <p>The charge of the iron cation. (A)</p> Signup and view all the answers

    What is the correct order of naming polyatomic ions derived from the same element?

    <p>Hypo…ite, –ite, –ate, Per…ate (B)</p> Signup and view all the answers

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