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.
They only differ from regular covalent bonds because both oth electrons come from one atom. In other respects a coordinate covalent bons is simply a covalent bond as both electrons are shared between two atoms.
Isomers have different physical and chemical properties.
Because although it has one valence electron when neutrally charged, it shares almost none of the chemical or physical properties of the other Group 1 elements. For example, where they are metallic solids at STP, hydrogen is a gaseous covalent molecule.
Atomic Masses are different So Boiling point, freezing points. inter-molecular forces, etc may be different as they depend on atomic masses
Isotopes of the same element differ in the number of neutrons. Isotopes have different physical properties but similar chemical properties.
chemical properties cannot be determined just by viewing or touching the substance and physical properties can be observed or measured without changing the composition of matter.
There are a lot of reasons why paper's physical properties differ from water's physical properties.Paper is a solid, water is a liquid.Water is transparent, paper is not.Water flows smoothly, paper does not.etc.
Isotopes are exactly same with respect to all the chemical properties but they differ with respect to physical properties.
you use the scratch test
A physical change would be a change in a physical property. A "physical property", by itself, may or may not change.
They only differ from regular covalent bonds because both oth electrons come from one atom. In other respects a coordinate covalent bons is simply a covalent bond as both electrons are shared between two atoms.
Isomers have different physical and chemical properties.
This would be a nonpolar covalent bond.
Yes. The properties of the molecule will differ from the properties of the individual atoms of which it is made.
Conductivity
Because although it has one valence electron when neutrally charged, it shares almost none of the chemical or physical properties of the other Group 1 elements. For example, where they are metallic solids at STP, hydrogen is a gaseous covalent molecule.
Atomic Masses are different So Boiling point, freezing points. inter-molecular forces, etc may be different as they depend on atomic masses