Chemistry ch. 8 test-final

What information does a molecular formula provide
The number and kind of atoms present in a molecule
How do atoms achieve noble-gas electron configurations in a single covalent bond
Two atoms share two electrons
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Why do atoms share electrons in covalent bonds
To attain a noble-gas electron configuration
Which of the following elements conform diatonic molecules held together by triple covalent bonds
nitrogen
Which noble gas has the same electron configuration as the oxygen in a water molecule
neon
What is the representative unit in a molecular compound
An ion
Which of the following diatonic molecules is joined by a double covalent bond
O2
Which molecule has a single covalent bond
Cl2
What causes water molecules to have a bent shape, according to VSEPR theory
Ionic attraction and repulsion
Which of the following atoms acquires the most negative charge in a covalent bond with hydrogen
S
A bond formed between a silicon atom and an oxygen atom is likely to be
Polar covalent
Which of the following covalent bonds is the most polar
H–F
According to VSEPR theory, molecules adjust their shapes to keep which of the following as far apart as possible
Pairs of valence electrons
The shape of the methane (CH4) molecule is
tetrahedral
Which of the forces of molecular attraction is the weakest
Dispersion
What causes dipole interactions
attraction between polar molecules
A depiction of the arrangement of atoms in molecules and polyatomic ions
Structural formula
The collective name for the two weakest attractions between molecules
Van der walls forces
A covalent bond between two atoms with similar electronegativities
nonpolar bond
A pair of valence electrons that is not shared between atoms
Unshared pair
A covalent bond between two atoms of significantly different electronegativities
Polar bonds
A type of bond that is very important in determining they properties of water and of important biological molecule such as proteins and DNA
Hydrogen bonds
How many valence electrons does an iodine atoms have
7
How many unshared pairs of electrons does the nitrogen atom in ammonia NH3 possess
1 pair, 2 electrons
How many electrons does carbon need to gain in order to obtain a noble-gas electron configuration
4 electrons
How many electrons are shared in a double covalent bond
4 electrons
How many unshared pairs of electrons are in a molecule of hydrogen iodide
3 pairs, 6 electrons
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