ساينس الصف الثاني الاعدادي – الفصل الدراسي الاول ساينس تانية اعدادي – ترم اول In This part we will study : Water is essential for the organism cannot live without water Because it is important in all the vital processes within the body. Structure of water molecule – Water molecule is formed by combination of one oxygen atom (O) with two hydrogen atoms (H) by two single covalent bonds, the angle between them is 104.5° – Due to the higher electronegativity of oxygen with respect to hydrogen, polar water molecules are linked together by “hydrogen bonds” Hydrogen bonds It is a weak electrostatic attraction force that arises between the molecules of polar compounds (as water molecules). لمتابعة مستر احمد الباشا وكل ما يخص الساينس : جروب الفيس بوك http://bit.ly/2Of1mcN صفحة الفيس بوك http://bit.ly/2Gq5xMo بالتوفيق مستر احمد الباشا