Nat 5 - Covalent Bonds and Structures

Front

What forms between non-metal atoms?

Back

Covalent bonds form between non-metal atoms.

Front

How is a covalent bond formed?

Back

A covalent bond forms when two positive nuclei are held together by their common attraction for a shared pair of electrons.

Front

What can diagrams show in covalent bonding?

Back

Diagrams can be drawn to show how outer electrons are shared to form the covalent bond(s) in a molecule.

Front

Which elements exist as diatomic molecules through covalent bonds?

Back

H2, N2, O2, F2, Cl2, Br2, I2 exist as diatomic molecules through the formation of covalent bonds.

Front

What determines the shape of simple covalent molecules?

Back

The shape depends on the number of bonds and the orientation of these bonds around the central atom.

Front

What are the possible shapes of simple covalent molecules?

Back

Linear, angular, trigonal pyramidal, or tetrahedral.

Front

What leads to double and triple covalent bonds?

Back

More than one bond can be formed between atoms.

Front

What are the two types of structures covalent substances can form?

Back

Covalent substances can form either discrete molecular or giant network structures.

Front

What are the characteristics of covalent molecular substances?

Back

They have strong covalent bonds within the molecules and only weak attractions between the molecules, low melting and boiling points, and do not conduct electricity.

Front

Why do covalent molecular substances have low melting and boiling points?

Back

Because only weak forces of attraction between the molecules are broken when a substance changes state.