Chapter 5 Test

When a non-metal atom bonds with another non-metal atom, an ionic bond is formed.

False

Which representation of a hydrogen molecule is not correct?

H=H

Which property could describe a covalent compound?

It is a gas at room temperature.

Which element is most likely to form three covalent bonds?

Phosphorus

The covalent bonding model is most useful in describing which of the following compounds?

SCl2

In the common nomenclature of ions, ous and ic are used as endings for the ions. In this system, which species is named with the ous ending?

The species with the lower positive charge.

Covalent compounds form distinct molecules, and therefore may exist as gases, liquids, or solids at room temperature, depending on the characteristics of the compound.

True

When two atoms share one or more pairs of electrons, a covalent bond is formed.

True

According to VSEPR theory, a molecule with three charge clouds including one lone pair would have a ________ shape.

bent

The water molecule has a ________ geometry because its central atom has ________ bonds and ________ lone pairs of electrons.

bent; two; two

A chemical bond formed between two identical atoms is a(an) ________ bond.

covalent

A chemical bond formed when two atoms share four electrons is a ________ bond; it is best described as

double; covalent

A chemical bond formed when two atoms share two pairs of electrons is a ________ bond; it is best described as

double; covalent

The bond angle in the molecule H2S is ________ because the

less than 109.5°; lone pairs force the hydrogen atoms closer together

The smallest possible unit of a covalent compound is a(an)

molecule

Which group contains only elements which normally exist as diatomic molecules?

nitrogen, oxygen, fluorine

A molecule that contains three identical polar bonds to the central atom will be

nonpolar if the geometry is planer triangular.

A molecule in which the central atom forms one double bond and two single bonds is said to have a ________ shape.

planar triangular

A molecule in which the central atom forms three single bonds and has one lone pair is said to have a ________ shape.

pyramidal

A chemical bond formed when two atoms share one pair of electrons is a ________ bond; it is best described as

single; covalent

A chemical bond formed when two atoms share two electrons is a ________ bond; it is best described as

single; covalent

In a covalent compound the bond length can be defined as

the distance between two nuclei when repulsion and attraction are balanced.

The VSEPR model or molecular structure requires a knowledge of ________ to predict the geometry of an atom in a molecule

the number of atoms bonded to the atom of interest

A chemical bond formed when two atoms share six electrons is a ________ bond; it is best described as

triple; covalent

A chemical bond formed when two atoms share three pairs of electrons is a ________ bond; it is best described as

triple; covalent

In forming covalent bonds where the octet rule is obeyed, sulfur usually forms ________ bonds and chlorine usually forms ________ bonds

two; one