a water molecule

a higher percentage of hydrogen ions than hydroxide ions

a hydrogen ion

a hydroxide ion

...neither an acid nor a base.

...a base only.

...an acid only.

...an acid and a base.

The Ruffini corpuscles

The Pacinian corpuscles

The Meissner's corpuscles

The Merkel cells

Solid, black wedges represent bonds extending out from the plane of the surface.

Dashed black lines indicate chemical bonds.

Spheres represent atoms in a structural formula.

It is the least informative chemical formula.

All molecules are compounds.

An element is formed entirely from one type of atom.

Molecules are only formed when two or more non-identical atoms bond via chemical bonds.

A compound if formed by two or more identical atoms of the same element.

Molecular models are always two-dimensional representations.

The space-filling model is a molecular model.

Molecular models can be depicted as either physical structures or computer-modeled illustrations.

Molecular models help to visualize the arrangement of molecules within chemical compounds.

Bond angles cannot be visually represented.

Atoms are represented by full-sized spheres

The bonds between the atoms are represented by straight or curved rods.

The size of the spheres is proportional to the relative size of the atoms.

Molecular compounds are formed by the transfer of electrons.

Molecular compounds contain two atoms of the same element.

Molecular compounds are formed by covalent bonds.

Molecular compounds are usually formed between a metal and a nonmetal.

CH₂O

C₆H₈O₆

CHO

C₃H₄O₃

Bond length

Relative atomic size

Bond angle

The three-dimensional shape of the molecule