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Terms in this set (26)
Double Covalent Bond
a covalent bond in which two pairs of electrons are shared
the forces between polar molecules
atoms have a tendancy to bond in such a way as to obtain a noble gas configuration, usually having eight valence electrons
a covalent bond between two atoms of significantly different electronegativities
a type of bond that is very important in determining the properties of water and of important biological molecules such as proteins and DNA; it results from the attraction of a hydrogen atom in a polar bond to the unshared pair of electrons in another molecule
Single Covalent Bond
a covalent bond in which only one pair of electrons is shared
How do atoms achieve noble-gas electron configurations in single covalent bonds?
Two atoms share two electrons
Why do atoms share electrons in covalent bonds?
to attain a stable noble-gas electron configuration.
Which of the following elements can form diatomic molecules held together by triple covalent bonds?
Which noble gas has the same electron configuration as the oxygen in a water molecule?
Which elements can form diatomic molecules joined by a single covalent bond?
hydrogen and the halogens only
What is the representative unit in a molecular compound?
Which of the following diatomic molecules is joined by a double covalent bond?
The chemical formula of an ionic compound shows
the lowest whole-number ratio between ions in the ionic compound.
How many valid electron dot formulas—having the same number of electron pairs for a molecule or ion—can be written when a resonance structure occurs?
2 or more
Which of the following atoms acquires the most negative charge in a covalent bond with hydrogen (electronegativity = 2.1)?
O (electronegativity = 3.5
A bond formed between a silicon (electronegativity = 1.8) atom and an oxygen (electronegativity = 3.5) atom is likely to be ____.
Which of the following covalent bonds is the most polar?
H—F (electronegativity F = 4.0)
What is thought to cause the dispersion forces?
motion of electrons
Which of the forces of molecular attraction is the weakest?
What causes dipole interactions?
attraction between polar molecules
What causes hydrogen bonding?
bonding of a covalently bonded hydrogen atom with an unshared electron.
Which type of solid has the highest melting point?
covalent network solid
What information does a molecular formula provide?
the number and kind of atoms present in a molecule
The molecular formula for the compound hydrogen cyanide is HCN. What information does the molecular formula provide about hydrogen cyanide?
The formula HCN indicates that a molecule of hydrogen cyanide contains one hydrogen atom, one carbon atom, and one nitrogen atom.
What is shown by the structural formula of a molecule or polyatomic ion?
the arrangement of bonded atoms
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