A homogeneous mixture is made up of multiple different substances. (You can see different parts)
Ex: Cereal in milk or ice in soda
A heterogeneous mixture is a mixture that is mixed well. ( you can’t see the different parts)
Ex: Rain or air
Yes.
A covalent bond holds it together, which is chemical.
Ethenol. Which has a molor mass of 44.05 g/mol