In a molecular substance, the covalent bonds between the atoms hold the individual molecule together as a unit and may be referred to as forces. The nonbonding forces of attraction between one individual molecule and another are called forces. Multiple choice question.

A) the enthralling of formation for pure element in its standard state is always positivehope this : )

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

B) movement of materials into and out of the cell