Regents Prep: Chemistry
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Regents Prep Chemistry: Topical Multiple-Choice Question Archive
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Chemical Bonding: Question 1 of 6
This question may require the use of the Chemistry Reference Tables or the Periodic Table of Elements.

Which formula represents a molecular substance?
  1. CaO
  2. CO
  3. Li2O
  4. Al2O3

Correct Answer Number: 2

Explanation: Use Ref. Table S to determine the electronegativity difference of each of the choices. The difference between C (2.6) and O (3.4) is 0.9 or in the range of covalent bonding (covalent bonds have electronegativity differences of less than 1.7). The other three compounds have differences in the ionic bond range or over 1.7.

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Chemical Bonding: Question 2 of 6
This question may require the use of the Chemistry Reference Tables or the Periodic Table of Elements.

Which sequence of Group 18 elements demonstrates a gradual decrease in the strength of the Van der Waals forces? All the choices are elements in the liquid state.
  1. Ar, Kr, Ne, Xe
  2. Kr, Xe, Ar, Ne
  3. Ne, Ar, Kr, Xe
  4. Xe, Kr, Ar, Ne

Correct Answer Number: 4

Explanation: Van der Waals forces are weak forces of attraction between molecules. These forces decrease as the molecule gets smaller and increase as the molecule increases. Look at the periodic table and notice how in answer 4, the elements are getting smaller. Therefore the Van der Waals forces would also be decreasing.

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Chemical Bonding: Question 3 of 6
This question may require the use of the Chemistry Reference Tables or the Periodic Table of Elements.

Which substance is an example of a network solid?
  1. nitrogen dioxide
  2. sulfur dioxide
  3. carbon dioxide
  4. silicon dioxide

Correct Answer Number: 4

Explanation: Only silicon dioxide forms a network solid, a network of covalent bonds extending throughout the crystal without forming a molecule.

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Chemical Bonding: Question 4 of 6
This question may require the use of the Chemistry Reference Tables or the Periodic Table of Elements.

Which combination of atoms can form a polar covalent bond?
  1. H and H
  2. H and Br
  3. N and N
  4. Na and Br

Correct Answer Number: 2

Explanation: See Reference Table S. The electronegativity difference between H (2.1) and Br (3.0) is 0.9. If the difference is less than 1.7 (but not zero, usually more than 0.4), a polar covalent bond is formed. A nonpolar covalent bond is formed when the difference is close to zero (usually up to 0.4). If the difference is more than 1.7, an ionic bond is formed.

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Chemical Bonding: Question 5 of 6
This question may require the use of the Chemistry Reference Tables or the Periodic Table of Elements.

A strontium atom differs from a strontium ion in that the atom has a greater
  1. number of electrons
  2. number of protons
  3. atomic number
  4. mass number

Correct Answer Number: 1

Explanation: Strontium has 2 valence electrons in its outer shell. It is easier to lose these 2 electrons than it is to gain 6 more electrons. Losing 2 electrons will give the strontium ion a charge of +2. Ions are charged atoms. An neutral atom has no charge because it has the same number of protons and electrons. An ion can have more or less electrons than an atom of the same element does. A strontium atom would have 2 more electrons than a strontium ion.

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Chemical Bonding: Question 6 of 6
This question may require the use of the Chemistry Reference Tables or the Periodic Table of Elements.

Which bond has the greatest ionic character?
  1. H---CL
  2. H---F
  3. H---O
  4. H---N

Correct Answer Number: 2

Explanation: See Ref. Table S. H has an electronegativity of 2.1 and F has an electronegativity of 4.0. Subtract the two values and the difference is 1.9. Ionic bonds have differences of 1.7 or greater. Find the electronegativity differences for the other choices. H--F has the greatest difference and is the most ionic of the choices.

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