2 3 simple molecules and covalent bonds

A short straight line between two atoms represents a covalent bond.

A covalent bond is a type of chemical bond where atoms share pairs of electrons with each other.

False. Covalent bonds involve sharing electrons, not transferring them.

The materials that form covalent bonds are non-metals.

Sharing electrons in the covalent bond allows each atom to achieve an electron configuration similar to a noble gas.

A compound / molecule is formed when a group of two or more atoms covalently bond together.

The smallest molecule is hydrogen, H2.

In a dot and cross diagram, dots and crosses represents electrons.

The dot and cross diagram for hydrogen, H2, is:

The dot and cross diagram for hydrogen chloride, HCl, is:

The dot and cross diagram for water, H2O, is:

False. The correct dot and cross diagram for oxygen is:

The dot and cross diagram for carbon dioxide, CO2, is:

False? If two adjacent atoms share two pairs of electrons, two covalent bonds are formed, also known as a double bond.

A triple bond is formed if three pairs of electrons are shared between two atoms.

A double bond exists between the carbon atoms in ethene.

The completed dot-and-cross diagram for methanol is:

False. Simple molecular structures have low melting and boiling points.

Covalent bonds are strong bonds that hold atoms together within a molecule, while intermolecular forces are weak attractive forces that exist between different molecules.

False. Covalent compounds are poor conductors of electricity.

Simple molecular structures are small molecules with covalent bonds, which have weak forces between the molecules (intermolecular forces).

Covalent compounds are generally poor conductors of electricity because they do not contain free ions or electrons to carry the current.

False. Intermolecular forces break when a covalent substance melts or boils..

As the relative molecular mass of a substance increases, the melting and boiling points also increase due to the increased number of electrons and stronger intermolecular forces.

Insulators are materials that do not allow the flow of electric charge or heat, and common insulators include plastics, rubber, and wood.

Simple molecular structures have low melting and boiling points due to weak intermolecular forces which require small amounts of energy to overcome.

True. Simple molecular structures are often gases or liquids at room temperature.