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What are some properties of molecular compounds?
Simple molecular structures like H2O and CO2 have the following properties: 1) Physical state: usually liquids and gases at room temperature due to weak intermolecular forces 2) Melting and boiling points: low (below 2000 C) melting and boiling points due to weak intermolecular forces 3) Electrical conductivity: cannot conduct electricity because there are no free electrons 4) Solubility: insoluble in water, but soluble in organic substances such as petrol Macromolecular structures such as diamond and SiO2 have the following properties: 1) Physical state: hard solids at room temperature due to the many strong covalent bonds holding the atoms together 2) Melting and boiling points: high melting and boiling points due to the many strong covalent bonds that must be broken before the substance can change state 3) Electrical conductivity: cannot conduct electricity because there are no free electrons 4) Solubility: insoluble
Are freezing and melting points characteristic properties?
Yes, freezing and melting points are characteristic properties of a substance. They are specific temperatures at which a substance changes its state from solid to liquid (melting) or from liquid to solid (freezing) under normal atmospheric pressure.
What are the effects of pressure on melting boiling points of a substance?
Increasing pressure generally increases the melting and boiling points of a substance. This is because pressure forces molecules to be packed closer together, making it harder for them to break free from each other in the solid or liquid phase. Conversely, decreasing pressure lowers the melting and boiling points.
Melting point of solid?
The temperature at which the kinetic energy overcomes the intermolecular forcesThe temperature at which the kinetic energy overcomes the intermolecular forces
What is fusion melting and how does it differ from other forms of melting?
Fusion melting is the process of turning a solid into a liquid by adding heat. It differs from other forms of melting because fusion melting specifically refers to the transition from a solid to a liquid state, whereas other forms of melting can refer to any phase transition from a solid to a liquid, gas, or plasma.
Compared with ionic compounds solid molecular compounds generally?
have lower melting and boiling points, exist as discrete molecules, and do not conduct electricity in the solid state.
What is the difference the melting point of organic and inorganic compounds?
Generally, organic compounds have lower melting points compared to inorganic compounds due to weaker intermolecular forces such as van der Waals forces in organic compounds. Inorganic compounds tend to have higher melting points because of stronger ionic or covalent bonds between their atoms.
Why do solid compounds have higher melting points than solid covalent compounds?
Solid molecular covalent compounds consist of molecules held together with intermolecular forces, such as dipole dipole interactions and london dispersion forces.Covalent compounds which are giant molecules such as found in diamond or silica are in fact high melting as the strong covalent bonds have to be broken to break down the crystal.Ionic compounds are generally high melting as the strong ionic bonds have to be broken to break down the crystal lattice.
Why do most solid covalent compounds have lower melting points than ionic compounds?
Solid covalent compounds have weaker intermolecular forces compared to the strong electrostatic forces present in ionic compounds. This results in lower melting points for covalent compounds since less energy is required to break the intermolecular forces holding the molecules together.
Which solid is more likely to have the lowest melting point an ionic solid or molecular solid?
A molecular solid is more likely to have a lower melting point than an ionic solid. This is because molecular solids are held together by weaker intermolecular forces such as van der Waals forces, while ionic solids have strong electrostatic forces between ions.
Why the melting and boiling point of covalent compound are low?
Compared to ionic compounds, covalent compounds have relatively low melting and boiling points because covalent bonds are not as strong as ionic bonds, and it is the bonds which hold materials together in the solid, or more solid phases.
What compounds will have the highest melting point CO2 CaCl2 N2H4 or SCl6?
CaCl2 is ionic, is solid and will have the highest melting point. The rest are covalent compounds.
Why do melting points of covalent compounds tend to be lower than those of ionic compounds?
Covalent compounds typically have weaker intermolecular forces compared to the strong electrostatic forces present in ionic compounds. This results in covalent compounds having lower melting points as less energy is required to break the intermolecular forces and transition from solid to liquid. Additionally, covalent compounds generally have a more disordered structure, which further contributes to their lower melting points.
What properties do most covalent compounds have in common?
Most covalent compounds have relatively low melting and boiling points, as they are held together by weak intermolecular forces. They are usually insoluble in water but soluble in nonpolar solvents. Covalent compounds tend to be nonconductors of electricity in their solid form.
Can you list properties of ionic compounds?
Ionic compounds are formed by the attraction between positively and negatively charged ions. They have high melting and boiling points. Ionic compounds are usually solid at room temperature. They conduct electricity when dissolved in water or melted.
Is a solid with a melting point of 800 degrees Celsius ionic or molecular?
The melting point of a compound cannot determine the bonding structure. As an example, both diamond and sodium chloride have higher melting points than 800 centigrade but are covalent and ionic compounds respectively.
Why do molecular compounds have low melting points and low boiling points relative to ionic substance's?
The melting points and boiling points of molecular covalent compounds (ones with discrete molecules) are lower than ionic solids and giant molecule covalent compounds like (silica, SiO2) because the forces that attract them together in the solid and the liquid states (van der waals, hydrogen bonding and dispersion forces) are weaker than ionic (or covalent) bonds.
