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... State and explain the trend in melting points of the elements down Group II from Mg to Ba. Magnesium is group 2, iron is group 8 and copper is group 11. Activity 1: – Reactions and properties of Group 2 elements - Answers4. Lesson 2: Group 2 Compounds. The general electronic configuration of these elements is ns 1 and ns 2 respectively. 2.11 Group II elements and their compounds. Chemical properties. Reaction of iodine with air. Chemistry. Group 2: Group 2 elements are known as alkaline earth metals. They react violently in pure oxygen producing a white ionic oxide. 2Mg + O 2MgO Mg will also react with warm water, giving a different magnesium hydroxide product. metal oxides + water In reactions of elements with the oxygen, we get products –oxides. Teacher instructions4. Barium, a group 2 element, forms an ionic compound with sulfur, ... An acid contains the elements hydrogen, oxygen, and chlorine and has a molecular weight of 52.46 g/mol. Ca + Cl 2 → CaCl 2. eg. A reducing agent is the compound that gets oxidised in the reaction and, therefore, loses electrons. This is an A2 Chemistry PowerPoint Presentation on period 3 elements – reactions with oxygen. The elements of Group 2 are beryllium, magnesium, calcium, strontium, barium, and radioactive radium. 3.1.2 (d, e) Reaction of Group 2 Oxides with Water and Group 2 compounds as Bases. The group 2 metals will burn in oxygen. All group 2 elements will react with oxygen to produce a metal oxide-Mg would need to be heated but Barium will react at room temp. Examples: M 2 O 3, MO 2, ThO 2. Mg + H2O ---> Mg(OH)2 + H2. e.g. You may remember that it is difficult to pick out any trends in reactivity in the elements, but there are trends that you can pick out. MgO + 2HCl MgCl 2 + H 2O Reactions with oxygen. Reaction of iodine with water. Group 1, 2 and lanthanides form basic compounds of oxygen when they react with dioxygen. Reactions of alkali metals with oxygen. Reaction with oxygen. REACTIONS OF THE GROUP 2 ELEMENTS WITH AIR OR OXYGEN This page looks at the reactions of the Group 2 elements - beryllium, magnesium, calcium, strontium and barium - with air or oxygen. Exposed to air, it will absorb water vapour from the air, forming a solution. with acid to produce hydrogen gas and the corresponding halide salt. All Group 2 elements tarnish in air to form a coating of the metal oxide. To know the reaction between group 2 metal oxides and water **2. The reaction with oxygen. These compounds readily react with water except a few exceptions. reactions of the group 2 elements with air or oxygen This page looks at the reactions of the Group 2 elements - beryllium, magnesium, calcium, strontium and barium - with air or oxygen. The group 2 consists of the elements beryllium(Be), magnesium(mg), calcium(Ca), strontium(Sr), barium(Ba) and radium(Ra). In these reactions, the elements that react with oxygen are all metals . The Hydrogen is +1 in the OH-ion and HCl, and +1 in water. What volume of hydrogen gas is produced if 2.50 g of magnesium metal is dissolved in excess hydrochloric acid in a fumehood with a temperature of 25 °C and a pressure of 1 bar (100 kPa)? Compare this with the coloured compounds of most transition metals. Email info@curriculum-press.co.uk Phone 01952 271 318 Resources Mg + 2 H2O Mg(OH) 2 + H2 This is a much slower reaction than the reaction with steam and there is no flame. Mg ribbon will often have a thin layer of magnesium oxide on it formed by reaction with oxygen. Ba + H2O ---> Ba(OH)2 + H2. Systems and interactions. reacts with water. Anhydrous calcium chloride is a hygroscopic substance that is used as a desiccant. 8 The Alkaline Earth Metals (Group 2) The alkaline earth metals react (quite violently!) 2.11.3 investigate and describe the reactions of the elements with oxygen, water and dilute acids; Republic of Ireland. This page mainly looks at the reactions of the Group 1 elements (lithium, sodium, potassium, rubidium and caesium) with oxygen - including the simple reactions of the various kinds of oxides formed. These elements are divided into two categories i.e, alkali metals or group 1 elements and alkaline earth metals or group 2 elements. The Group II elements are powerful reducing agents. The products of these reactions are what we might expect. Oxides of all Period 3 elements except Cl and Ar could be made on the same method: burning the element in the air in a combustion reaction when the element will react with the oxygen in the air to produce the oxide of the element. Alkaline earth metals also react with oxygen, though not as rapidly as Group 1 metals; these reactions also require heating. Group 2 reactions Reactivity of group 2 metals increases down the group Mg will also react slowly with oxygen without a flame. 2Mg + O2 2MgO This needs to be cleaned off by emery paper before doing reactions with Mg ribbon. The Facts The reactions with oxygen Formation of simple oxides As group 2 in the periodic table comprises of metals, the reactivity of group 2 elements towards chlorine increases when working our way down the group 2 metals. Their oxides and hydroxides are alkaline in nature. As I said earlier, they are powerful reducing agents. This is compared to non-metals when the reactivity decreases working down a non-metal group such as group 7. They have a low enthalpy of ionization and high electropositive character, the alkaline earth metals have a strong tendency to lose valence electrons. Activity 2 – Thermal stability of Group 2 carbonates - Answers5. Note: You will find the reason why lithium forms a nitride on the page about reactions of Group 2 elements with air or oxygen.You will find what you want about 3/4 of the way down that page. Redox reactions of Group 2 metals (a) describe the redox reactions of the Group 2 elements Mg - Ba: (i) with oxygen, Group 2 elements react vigorously with oxygen. 1. The Group 1 elements, also known as the alkali metals, all react vigorously with water to produce an alkaline solution. Na 2 O + H 2 O → 2NaOH. You will find this discussed on the page about electronegativity. 1.3.2 (a) Redox Reactions of Group 2 Metals. 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. It explains why it is difficult to observe many tidy patterns. Junior Cycle. (3) Both group 1 and group 2 elements produce white ionic compounds. (i) The Reactions of Group 2 Elements with Oxygen. Topic 4A: The elements of Groups 1 and 2. Investigate reactions between acids and bases; use indicators and the pH scale; Leaving Certificate. These compounds are usually ionic in nature. **By the end of this lesson students should be able to: **1. All Group II elements react with acid to give hydrogen gas and the corresponding salt; M(s) + H⁺(aq) → M²⁺(aq or s) + H2(g) ; where M = A Group II element. This page mainly looks at the reactions of the Group 1 elements (lithium, sodium, potassium, rubidium and caesium) with oxygen - including the simple reactions of the various kinds of oxides formed. When zinc metal reacts with oxygen gas, {eq}2Zn(s) + O_2(g) \to 2ZnO(g) {/eq}, large amounts of light and heat are released. Group 2 elements generally react to form compounds in which the group 2 element has an oxidation state of +2, beryllium will also do this but it has a tendency to form covalent rather than ionic compounds. In this video I take a look at some of the different ways in which group 2 elements can react. To onstruct half equations of redox reactions of group 2 elements with oxygen, water and dilute acids and to identify what species have been oxidised and reduced using oxidation numbers. There is a diagonal relationship between lithium and magnesium. The Oxygen is -2 in the OH-ion, and -2 in water. M = Mg, Ca, Sr,Ba --> I will be using 'M' as the general symbol for a Group II element in this topic. M (s)----> M 2+ (aq) + 2e- A redox reaction occurs where an ionic oxide is produced with the formula MO (where M is the group 2 metal) eg– 2Ca(s) + O2(g) ----> 2CaO(s) The Chemistry of Group 2. 3.1 The periodic table. Beryllium reacts slowly with acids and has no reaction at room temperature. Mg burns with a bright white flame. Because they are not as active as the alkali metals, most of these elements form oxides. Test yourself questions - Answers8. This property is known as deliquescence. 2Sr (s) + O2 (g) ----> 2SrO (s) solubility of group 2 hydroxides increase down the group. Again, if you have been working through this section of the syllabus in order, you will already have read the first bit of the page Reactions of the Group 2 elements with oxygen. Reactivity of Group 2 elements: x Group 2 metals are reactive: M Æ M 2+ + 2e-x These elements give away 2 electrons when they react. During the formation of these compounds, a large amount of energy is released. Lithium's reactions are often rather like those of the Group 2 metals. Reaction with halogens. Reaction with sulphur. It also deals very briefly with the reactions of the elements with chlorine. 2 Mg(s) + O 2 (g) 2 MgO(s) Calcium, strontium, and barium can also form peroxides. 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. Reaction with acids. B. Science. Ca + 1/2O 2 → CaO Mg + 1/2O 2 → MgO. 8. Iodine, I 2 is not reactive towards with oxygen, O 2, or nitrogen, N 2.However, iodine does react with ozone, O 3, the second allotrope of oxygen, to form the unstable yellow I 4 O 9, the nature of which is perhaps I(IO 3) 3.. Chemical world. Acidic oxide: 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. It also deals very briefly with the reactions of the elements with chlorine. Since the alkali metals are the most electropositive (the least electronegative) of elements, they react with a great variety of nonmetals. Activity 3 – The reactions of Group 2 elements - Answers6. When these metals (M) are heated in oxygen they burn vigorously to produce a white ionic oxide, M2+O2-. This is important as elements in the same group will react similarly. 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