Question
1. Covalent bonds are __ (inside,between, outside) the molecules Weak intermolecular forces are __ (inside, between, outside) the molecules. 2. Write down 2 properties of all simple molecular substances a __ (low, intermediate, high) melting point and boiling point b __ (no, poor, good) electrical conductivity 3. Write a short explanation for why simple molecular substances have a low boiling point. Include the words:weak intermolecular forces and molecules __ 4. Write a short explanation for why simple molecular substances have no electrical conductivity. Include the words.electrons and ions
Answer
4.4
(214 Votes)
Wanda
Master · Tutor for 5 years
Answer
1. Covalent bonds are
the molecules. Weak intermolecular forces are
the molecules.2. a. All simple molecular substances have
melting and boiling points.b. They portray
electrical conductivity.3. Simple molecular substances have low boiling points because they are maintained by weak intermolecular forces, requiring less energy to separate the molecules during boiling.4. Simple molecular substances show evidently poor electrical conductivity because free movement of electrons and the insufficient presence of ions is desirous for enhanced conductivity, which does not eventuate much in these substances.
Explanation
## 1. The first question concerns understanding the location of the covalent bonds and weak intermolecular forces. Covalent bonds are the bonds formed by sharing of electrons and they are found "inside" the molecules, holding together its atoms. Intermolecular forces are the forces between different molecules, weak intermolecular forces signify weak attraction between separate molecules hence, it is "between" molecules.## 2. The properties of simple molecular substances primarily concern their physical attributes and transmission abilities in relation to electrical conduction. ### a) All pure covalent substances have relatively **low melting and boiling points** due to the fact that the particles are held together by weak intermolecular forces which are overwhelmed by thermal energy at low temperatures. ### b) Simple molecular substances also have **poor to virtually no electrical conductivity**. The electrons within simple molecular structures are tightly held within its individual atoms and bounded together by covalent bonds limiting charge flow or the freedom of free-moving charges (ions/electrons) necessary for current or conduction.## 3. **The boiling points** of substances is determined by the strength of the bonds - whether inter or intra molecular, that hold particles together. The weaker the bonds, the lesser energy it requires to separate those particles/convert a liquid to gas or us, which relates to its boiling points being lesser. As simple molecular substances are held together mainly by *weak intermolecular forces*, the energy needed to separate these molecules from each other (during boiling or evasion), tend to resulted into low boiling points compared to other types of substances.## 4. **Electrical conductivity** is conveyed by mobile charge carriers, typically ions or free electrons. The ability of a substance to begin conduction or to allow electron flow (charges to move) depends on how very many free-moving charges it possesses. Simple molecular substances withhold their electrons tightly with **lack of existence of ions**. The availability of free electrons or ions that can propagate a current across the substance is basically on the low to non-exist, hence their observably lower conductivity compared to metallic substances.