A) At 0 C water forms ice but as mentioned above F) water's greatest density occurs at 4 C and it decreases below 4 C so ice is lighter than 4C water, thus, at 0C ice comes to surface and acts as insulator thereby preventing lower water from freezing.
carbon has 4 valence electrons
.8 grams of phosphorus are recommended.
Found... Im not exactly sure just a guess
