AP BIOLOGY

Detailed explanation-1: -A water molecule has three atoms: two hydrogen (H) atoms and one oxygen (O) atom. That’s why water is sometimes referred to as H2O.

Detailed explanation-2: -Hydrogen, the smallest of atoms has 1 outer electron, making it have a slightly positive charge (+1). The slightly negative charge of an oxygen atom attracts the slightly positively charged hydrogen atoms. Since oxygen needs 2 electrons, it can attract 2 hydrogen atoms.

Detailed explanation-3: -Water is a simple molecule consisting of one oxygen atom bonded to two different hydrogen atoms. Because of the higher electronegativity of the oxygen atom, the bonds are polar covalent (polar bonds).

Detailed explanation-4: -If we want to make 2 water molecules, we will need 4 hydrogen atoms and 2 oxygen atoms.

Detailed explanation-5: -The ratio of hydrogen atoms to oxygen atoms used to make water molecules is always 2:1, no matter how many water molecules are being made.