2.11.3 investigate and describe the reactions of the elements with oxygen, water and dilute acids; Republic of Ireland. Reaction of Group-2 Metals with Cl 2 : All Gr-2 metals except Be react with chlorine to give ionic chlorides whereas Be reacts with chlorine to give covalent chloride. Magnesium can be substituted for any Group 2 metal, however. 1.3.2 (b) Reactivity of Group 2 Elements. Solubility in water: * Except Li 2 CO 3, The group-1 carbonates are fairly soluble in water. Notable examples include alkali metals, sodium through caesium, and alkaline earth metals, magnesium through barium.. The solubilities of the hydroxides of the elements increase going down the group. Reaction with Water. Junior Cycle. The products of these reactions are what we might expect. 8. However, the reaction soon stops because the magnesium hydroxide formed is almost insoluble in water and forms a barrier on the magnesium preventing further reaction. Reaction with oxygen. b) Cl 2 dissolves in H 2 O and some hydrolysis occurs. (a) Reaction rate (reactivity) increases down group 2 from top to bottom (b) First ionisation energy decreases down group 2 from top to bottom (d) Magnesium is the second element from the top in Group 2 and does not react with hydrogen but does react with water slowly. Trend of reactivity with water Be doesn’t react Mg very slowly with cold water, but fast with steam the reaction is rapid: Mg + H 2 O → MgO + H 2 Ca steadily Sr quickly Ba rapid and vigorously. REACTIONS OF THE GROUP 2 ELEMENTS WITH COMMON ACIDS This page looks at the reactions of the Group 2 elements - beryllium, magnesium, calcium, strontium and barium - with common acids. Hence, their reactivity decreases down the group. M(s) + H 2 O(l) --> M(OH) 2 (aq) + H 2 (g) This is another example of a redox reaction. 2Mg + O2 2MgO This needs to be cleaned off by emery paper before doing reactions with Mg ribbon. Ba(s) + O 2 (g) BaO 2 (s) The more active members of Group IIA (Ca, Sr, and Ba) react with water at room temperature. A group 2 oxide would form water instead of hydrogen gas, and as for if it dissolves, I think it depends on is the metal hydroxide is a solid or aqeous as it could form a precipitate. Reactions with dilute hydrochloric acid All the metals react with dilute hydrochloric acid to give bubbles of hydrogen and a colourless solution of the metal chloride. Also some group 2 elements GROUP 1 All of these metals react vigorously or even explosively with cold water. In this classic experiment, from the Royal Society of Chemistry, students carry out a series of chemical reactions involving group 2 metals. 2.11 Group II elements and their compounds. • provide 2 concepts the spoke of reaction of sodium with water has similarities, and a pair of concepts in which that is diverse to that of lithium. As an example, the following reaction takes place between magnesium and water, an alkali earth metal hydroxide and hydrogen gas is produced. Today we're covering: Properties of Group 2 compounds Reactions Oxides with water Carbonates with acid Thermal decomposition Carbonates Nitrates Solubility Hydroxides Sulfates Let's go! Reactivity increases down the group. This means that the alkali metals all have similar chemical properties . Group 2 reactions Reactivity of group 2 metals increases down the group Mg will also react slowly with oxygen without a flame. Similar Reactions with Water: Group 1 metals will react similarly with water as they are a family of elements called alkali metals; They will react vigorously with water to produce an alkaline metal hydroxide and hydrogen gas. Group 2 oxides and hydroxides, formed with the reaction with oxygen and water are bases. However, in a reaction with steam it forms magnesium oxide and hydrogen. Reaction of Alkaline Earth Metals with Water Magnesium has a very slight reaction with cold water. The s-metals consist of the Alkali Metals (Group 1) and the Alkaline Earth Metals (Group 2).They generally occur in compounds with oxidation states +1 and +2 respectively, though in the absence of air and water, some compounds with the metals in lower oxidation states may be prepared. Fluorine reacts vigorously with water to produce oxygen (O 2) and hydrogen fluoride (HF): 2 F 2 (g) + 2 H 2 O(l) → O 2 (g) + 4 HF(aq) Chlorine has maximum solubility of ca. The equations for the reactions: All metal chlorides above are white ionic solid. • Write a word equation, and image equation, for the reaction of lithium with water. being only sparingly soluble. The outer electrons are easier to remove as they are further from the nucleus and there is more shielding resulting in Some of the Group 1 and 2 metals are amongst the most abundant: calcium, sodium, magnesium and potassium … In all their reactions the halogens act as oxidising agents. These can neutralise acids to form a salt and water. Water-reactive substances are those that spontaneously undergo a chemical reaction with water, as they are highly reducing in nature. Mg ribbon will often have a thin layer of magnesium oxide on it formed by reaction with oxygen. The pH of the Group 2 hydroxide solution is pH 10-12. Group 2 hydroxides are more alkaline down the group and reactivity down the group with water also increases as the first ionisation energy decreases. 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