AP BIOLOGY

Detailed explanation-1: -The molecules of covalent compounds are held by weak intramolecular forces. Thus, a very small amount of energy is required to break the bonds between two or more molecules. That is why they have low melting and boiling points.

Detailed explanation-2: -Covalent molecular They have low melting points and boiling points because the attractions between molecules are easy to overcome.

Detailed explanation-3: -Covalent bonds between atoms are quite strong, but attractions between molecules/compounds, or intermolecular forces, can be relatively weak. Covalent compounds generally have low boiling and melting points, and are found in all three physical states at room temperature.

Detailed explanation-4: -Covalent compounds haveweak forces of attraction between the binding molecules. Thus less energy is required to break the force ofbonding. Therefore covalentcompounds have low melting andboiling point.

Detailed explanation-5: -(b)Ionic compounds have generally high melting points. (a) Covalent compounds generally have low melting point because they are made up of electrically neutral molecules. Hence, the force of attraction between the molecules will be very weak resulting in less amount of energy required to break these molecular forces.