Biology 1225 Chapter Notes - Chapter 2: Chemical Polarity, Hydrogen Bond, Chemical Bond
Document Summary
2 polar covalent bonds in each water molecule. No charge: o has slight negative charge and h has slight positive charge, polar -> attaches. Hydrogen bond: attraction between covalently bonded hydrogen atom and another atom them together taking part in separate polar covalent bond. Do not make molecules out of atoms, not chemical bond. Form and break more easily than covalent or ionic. Polarity and ability to form hydrogen bonds make water excellent solvent. Hydrophilic: substance that dissolves in water easily, water-loving. Bonds between many molecules is stronger than ionic bonds with 2 molecules. Solvent: liquid in which substances dissolve in. Chemical bonds do not form between molecules of solute and solvent -> proportions can vary. Non-ionic substances can dissolve easily in water. Have one or more polar covalent bond. Hydrogen bonds collectively exert continuous pull on its individual molecules. Overcoming waters cohesion takes energy -> evaporation sucks energy from liquid water and lowers water"s surface temperature.