ساينس الصف الثاني الاعدادي – الفصل الدراسي الاول ساينس تانية اعدادي – ترم اول In This part we will study : The chemical properties of metals 1. Reaction of metals with dilute acids : 1 . Some active metals such as magnesium (Mg) and zinc (Zn) react with dilute acids (as hydrochloric acid) giving a salt of an acid and hydrogen gas is evolved. Mg +2HCl □(→┴Dilute ) 〖MgCl〗_2+ H_2↑ 2. Inactive metals such as copper (Cu) don’t react with dilute acids and no gas evolves . Cu +HCl □(→┴Dilute ) No Reaction Basic oxides They are metallic oxides, some of them dissolve in water forming alkaline solutions. Acidic oxides: They are nonmetallic oxides, which dissolve in water forming acidic solutions. metals – They are the elements , which have less than four electrons in their outermost energy levels – They tend to lose electrons and change into (+ve) ions . They are characterized by largest atomic sizes and smallest electronegativity. – Some of them react with dilute acids forming a salt of an acid and hydrogen gas . – They react with oxygen forming basic oxides nonmetals – They are the elements , which have more than four electrons in their outermost energy levels . – They tend to gain electrons and change into (+ve) ions . into (-ve) ions . – They are characterized by smallest atomic sizes and largest electronegativity. – They don’t react with dilute acids . – They react with oxygen forming acidic oxides. 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