Such reaction is: $$ MgO_{(s)} + H_{2}O_{(l)} \rightarrow Mg(OH)_{2(aq)} $$ Group 2 hydroxides. At high temperatures, beryllium reacts with the stream and produces hydrogen and white beryllium oxide. The majority of alkaline earth metals on reaction with water produces the hydroxides. It explains why it is difficult to observe many tidy patterns. The group 2 metal is oxidised from an oxidation state of zero to an oxidation state of +2. This page looks at the reactions of the Group 2 elements - beryllium, magnesium, calcium, strontium and barium - with water (or steam). The further you move down the group the more vigorous the reaction with water. It uses these reactions to explore the trend in reactivity in Group 2. REACTIONS OF THE GROUP 2 ELEMENTS WITH WATER This page looks at the reactions of the Group 2 elements - beryllium, magnesium, calcium, strontium and barium - with water (or steam). The Facts. The reactions with oxygen. Reactions with dilute hydrochloric acid. They are beryllium, magnesium, calcium, strontium, barium and radium. The Facts. The Group 2 elements react with water to form hydroxides with the general formula M(OH) 2 and hydrogen gas. Magnesium has a very slight reaction with cold water. Illustrating the increase of reactivity with cold water going down Group 2 Reaction with Water. Mg(OH) 2(s) + 2 HCl (aq) → MgCl 2(aq) + 2 H 2 O (l) The Mg ions remain 2+ The Oxygen is -2 in the OH-ion, and -2 in water. REACTIONS OF THE GROUP 2 ELEMENTS WITH WATER. Reaction of group 2 oxides with water. ALKALINE METALS They have low electron affinity. Group 2 oxides react with water to form a solution of metal hydroxides. Just like the alkali metals the alkaline earth metals also react with the water and produce the hydroxides. Formation of simple oxides. The Facts Beryllium Beryllium has no reaction with water or steam even at red heat. M(s) + H 2 O(l) --> M(OH) 2 (aq) + H 2 (g) This is another example of a redox reaction. The alkaline earth metals found in group 2 of the periodic table. It uses these reactions to explore the trend in reactivity in Group 2. oxides of group 2 react with water to form hydroxide ions (OH-) and alkaline solutions of the metal hydroxide give the equation for calcium oxide reacting with water CaO (s) + H2O (l) -> Ca2+ (aq) + 2OH- … Calcium, strontium and barium react with cold water and the reactivity increases from calcium to … On the whole, the metals burn in oxygen to form a simple metal oxide. Group 2 elements are called alkaline metals because they form alkaline solutions, hydroxides, when reacting with water and their oxides are found in the earth’s crust. These hydroxides have a typical pH of 10-12. Group 2 elements all react with water in a similar way: Metal + Water --> Metal Hydroxide + Hydrogen. This page looks at the reactions of the Group 2 elements - beryllium, magnesium, calcium, strontium and barium - with common acids. 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