Chapter 8 Chemistry Test

Two atoms share two electrons

How do atoms achieve noble-gas electron config in single covalent bonds?

4

How many electrons are shared in a double covalent bond?

4

How many electrons does carbon need to gain a noble-gas electron config?

3

How many unshared pairs of electrons are in a molecule of hydrogen iodide?

1

How many unshared pairs of electrons does the nitrogen atom in ammonia, NH3 possess?

7

How many valence electrons does an iodine atom have?

Pairs of valence electrons

Accroding to VSEPR theory, molecules adjust their shapes to keep which of the following as far apart as possible?

Explain difference between single, double, and triple covalent bonds. Then discuss the bond length and strength of each type.

Single bonds share one pair of electrons, have the longest bond length, and the weakest bond strength. Double bonds share two pairs of electrons, have the 2nd longest bond length, and the 2nd strongest bond strength. Triple bonds share three pairs of electrons, have the shortest bond length, and are the strongest bond?

Tetrahedral

The shape of the methane (CH4) molecule is...

attraction between polar molecules

What causes dipole interactions?

Repulsive forces btwn unshared pairs of electrons

What causes water molecules to have a bent shape, according to VSEPR theory?

The number and kind of atoms present in a molecule

What info does a molecular formula provide?

a molecule

What is the rep unit in a molecular compound?

Cl(2)

Which molevule has a single covalent bond? CO(2)? Cl(2)? CO? N(2)?

Neon

Which noble gas has the same electron config. as the oxygen in a water molecule? Helium? Neon? Argon? Xenon?

O

Which of the following atoms acquires the most negative the most charge in a covalent bond with hydrogen? C? Na? O? S?

H-F

Which of the following covalent bonds is the most polar? H-F? H-C? H-H? H-N?

O(2)

Which of the following diatomic molecules is joined by a double covalent bond? O(2)? Cl(2)? N(2)? He(2)?

Nitrogen

Which of the following elements can form diatomic molevules held togeher by tiple covalent bonds?

Dipole interaction

Which of the forces of molecular attraction is the weakest? Dipole interaction? Dispersion? Hydrogen bond? Single Covalent bond?

to attatin a noble-gas electron config.

Why do atoms share electrons in covalent bonds?

nonpolar bond

a covalent bond between two atoms with similar electronegativities

Polar bond

a covalent bond btwn two atoms of significantly different electronegativities

structural formula

a depiction of the arrangement in molecules and polyatomic ions

Unshared pair

a pair of valence electrons that is not shared between atoms

hydrogen bond

a type of bond that is very important in determining the prop of water and of important biological molecules such as DNA and proteins

van der Waals forces

the collective name for the two weakest attractions btwn molecules

Polar covalent

A bond formed btwn a silicon atom and an oxygen atom is likely to be...