Title: Exam 3-Fall 2016
Course: DOL Grant Introduction to Chemistry

Q: A nonpolar molecule can have polar bonds.
- True
- False
A: True

Q: A polar covalent bond is found in which of these compounds?
- H<sub>2</sub>O
- F<sub>2</sub>
- NaCl
- H<sub>2</sub>
- N<sub>2</sub>
A: H<sub>2</sub>O

Q: A positive ion has more protons that electrons.
- True
- False
A: True

Q: A potassium atom gains electrons to form an ion with a charge of 1-.
- True
- False
A: False

Q: According to naming rules, the types of compound that use prefixes in their names are ________.
- ionic compounds
- ionic compounds involving transition metals
- polyatomic ions
- molecular compounds
- compounds that contain polyatomic ions
A: molecular compounds

Q: Ammonia, (NH<sub>3</sub>), is a polar molecule.
- True
- False
A: True

Q: Br<b><sub>2</sub></b> contains a polar covalent bond.
- True
- False
A: False

Q: Double and triple bonds form because ________.
- the atoms involved have high electronegativities
- single covalent bonds do not give all of the atoms in the molecule eight valence electrons
- one of the atoms in the molecule has more than 8 valence electrons
- the ions involved have charges larger than one
- there is at least one hydrogen atom involved in the bond
A: single covalent bonds do not give all of the atoms in the molecule eight valence electrons

Q: Elements in group 2A (2) of the periodic table form ions with a charge of ________.
- 1+
- 1-
- 2+
- 3+
- 0
A: 2+

Q: In a molecule with covalent bonding, ________.
- oppositely charged ions are held together by strong electrical attractions
- atoms of metals form bonds to atoms of nonmetals
- atoms of different metals form bonds
- atoms are held together by sharing electrons
- atoms of noble gases are held together by attractions between oppositely charged ions
A: atoms are held together by sharing electrons

Q: The ability of an atom to attract the shared electrons in a covalent bond is its ________.
- electronegativity
- bonding ability
- polarity
- ionic character
- nonpolarity
A: electronegativity

Q: The correct formula for a compound formed from the elements Al and O is ________.
- AlO
- Al<sub>2</sub>O
- Al<sub>3</sub>O<sub>2</sub>
- AlO<sub>3</sub>
- Al<sub>2</sub>O<sub>3</sub>
A: Al<sub>2</sub>O<sub>3</sub>

Q: The correct name for the compound N<sub>2</sub>O<sub>3</sub> is ________.
- nitrogen oxide
- nitrogen trioxide
- dinitride trioxide
- dinitrogen oxide
- dinitrogen trioxide
A: dinitrogen trioxide

Q: The main type of attractive forces between molecules of hydrogen (H<sub>2</sub>) are ________.
- ionic bonds
- hydrogen bonds
- polar covalent
- dipole-dipole attractions
- dispersion forces
A: dispersion forces

Q: The main type of attractive forces between molecules of carbon tetrabromide (CBr<sub>4</sub>) are ________.
- ionic bonds
- hydrogen bonds
- polar covalent
- dipole-dipole attractions
- dispersion forces
A: dispersion forces

Q: The name of Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> is ________.
- aluminum(III) sulfate
- dialuminum trisulfate
- dialuminum sulfate
- dialuminum trisulfide
- aluminum sulfate
A: aluminum sulfate

Q: The number of electrons in an ion with 16 protons and an ionic charge of 2- is ________.
- 16
- 18
- 20
- 22
- 24
A: 18

Q: The shape of the ammonia molecule (NH<sub>3</sub>) is ________.
- linear
- trigonal planar
- trigonal pyramidal
- tetrahedral
- bent
A: trigonal pyramidal

Q: What is the correct formula for iron(III) sulfide?
- Fe<sub>2</sub>S<sub>2</sub>
- Fe<sub>2</sub>S
- FeS
- FeS<sub>2</sub>
- Fe<sub>2</sub>S<sub>3</sub>
A: Fe<sub>2</sub>S<sub>3</sub>

Q: What is the formula for aluminum nitrate?
- Al<sub>2</sub>NO<sub>2</sub>
- AlNO<sub>3</sub>
- Al(NO<sub>2</sub>)<sub>3</sub>
- Al(NO<sub>3</sub>)<sub>3</sub>
- Al<sub>2</sub>(NO<sub>2</sub>)<sub>2</sub>
A: Al(NO<sub>3</sub>)<sub>3</sub>

Q: What is the formula of a compound that contains Na<sup>+</sup> and PO<sub>4</sub><sup>3-</sup> ions?
- Na<sub>3</sub>PO<sub>4</sub>
- NaPO<sub>4</sub>
- Na<sub>2</sub>PO<sub>3</sub>
- Na<sub>3</sub>PO<sub>3</sub>
- Na<sub>3</sub>P
A: Na<sub>3</sub>PO<sub>4</sub>

Q: What is the ionic charge of an ion with 13 protons and 10 electrons?
- 1+
- 2+
- 3+
- 2-
- 3-
A: 3+

Q: What is the symbol for the ion with 19 protons and 18 electrons?
- F<sup>+</sup>
- F<sup>-</sup>
- Ar<sup>+</sup>
- K<sup>-</sup>
- K<sup>+</sup>
A: K<sup>+</sup>

Q: When a cation is formed from a representative element ________.
- electrons are gained and the ion is larger
- electrons are gained and the ion is smaller
- electrons are lost and the ion is larger
- electrons are lost and the ion is smaller
- the cation acquires a negative charge
A: electrons are lost and the ion is smaller

Q: Which of the following substances contains a nonpolar covalent bond?
- H<sub>2</sub>O
- NaCl
- NH<sub>3</sub>
- MgF<sub>2</sub>
- N<sub>2</sub>
A: N<sub>2</sub>

Q: Which one of the following elements forms two or more ions with different ionic charges?
- K
- F
- Ca
- O
- Fe
A: Fe

Q: How many electrons will aluminum gain or lose when it forms an ion?
- lose 1
- gain 5
- lose 2
- lose 3
- gain 1
A: lose 3

Q: Which of the following compounds contains an ionic bond?
- NH<sub>3</sub>
- H<sub>2</sub>O
- CaO
- H<sub>2</sub>
- CH<sub>4</sub>
A: CaO

Q: Molecular compounds are formed from ions.
- True
- False
A: False

Q: Sodium is more electronegative than chlorine.
- True
- False
A: False

Q: The formula of the compound chromium(III) oxide is Cr<sub>2</sub>O<sub>3</sub>.
- True
- False
A: True

Q: The molecule SCl<sub>2</sub> is linear.
- True
- False
A: False

Q: The name of the compound AlCl<sub>3 </sub>is aluminum trichloride.
- True
- False
A: False

Q: The name of the compound CuSO<sub>4 </sub>is copper(I) sulfate.
- True
- False
A: False

Q: The strongest attractive forces between molecules of Cl<sub>2</sub> are dispersion forces.
- True
- False
A: True

Q: The strongest attractive forces between molecules of H<sub>2</sub>O are dispersion forces.
- True
- False
A: False

Q: When Al<sup>3+</sup> and Br<sup>-</sup> combine, the formula of the product is Al<sub>3</sub>Br.
- True
- False
A: False

Q: The bond between Li and F is polar covalent.
- True
- False
A: False

Q: For halogens, the group number is the same as the ionic charge.
- True
- False
A: False

Q: The strongest attractive forces between molecules of HCl are hydrogen bonds.
- True
- False
A: False