What are two properties of covalent compounds?
1.They exist as gases, liquids or solids with low melting points because the forces of attraction between the molecules are weak
2. they generally do not conduct electricity because they are not made up of ions.
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Covalent compounds generally have much lower melting and boiling points that ionic compounds. Covalent compounds are soft and squishy. Covalent compounds tend to be more flammable that ionic compounds. Covalent compounds don't conduct electricity in water. Covalent compounds aren't usually very soluble in water.
There are more than two. In general: Covalent compounds have low melting and boiling points while ionic compounds have high melting and boiling points. Ionic compounds are good conductors of electricity when melted, while covalent compounds are not. Ionic compounds are soluble in water, while covalent compounds are soluble in non-polar liquids. These are the essentials, but other differences exist. All of these are generalizations, exceptions do occur.
The properties of covalent compounds are: they have relatively low melting and boiling points, they tend to be soft and relatively flexible, they are more flammable, when dissolved in water they don't conduct electricity, many don't dissolve well in water, and they don't need as much energy to melt or vaporize as an ionic compound does.
Ionic bond: the electronegativity difference between two atoms is higher than 2. Covalent bond: the electronegativity difference between two atoms is lower than 2. Ionic compounds dissolved (or melted) forms ions and have electrical conductivity; covalent compounds doesn't dissociate in ions. Ionic compounds have a higher melting point than covalent compounds.
A binary covalent compound is one that contains two substances joined by covalent bonds. For example, two nonmetals often join together to form covalent compounds. So, P2O5 (phosphorus pentoxide) is a binary covalent compound. H2O (dihydrogen monoxide) is another one. This is in contrast to binary ionic compounds, which are salts, and are formed by a metal combining with a nonmetal with ionic bonds.