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. 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. 2 Mg(s) + O 2 (g) 2 MgO(s) Calcium, strontium, and barium can also form peroxides. The general electronic configuration of these elements is ns 1 and ns 2 respectively. Activity 2 – Thermal stability of Group 2 carbonates - Answers5. Ca + Cl 2 → CaCl 2. Chemical properties. 8 The Alkaline Earth Metals (Group 2) The alkaline earth metals react (quite violently!) 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. Lesson 2: Group 2 Compounds. Part of. Test yourself questions - Answers8. The Oxygen is -2 in the OH-ion, and -2 in water. Investigate reactions between acids and bases; use indicators and the pH scale; Leaving Certificate. Exposed to air, it will absorb water vapour from the air, forming a solution. During the formation of these compounds, a large amount of energy is released. (3) Both group 1 and group 2 elements produce white ionic compounds. 3.1.2 (d, e) Reaction of Group 2 Oxides with Water and Group 2 compounds as Bases. 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. 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. 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 reaction with oxygen. ... State and explain the trend in melting points of the elements down Group II from Mg to Ba. 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. 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. 8. Mg + H2O ---> Mg(OH)2 + H2. reacts with water. Examples: M 2 O 3, MO 2, ThO 2. Beryllium reacts slowly with acids and has no reaction at room temperature. 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. As I said earlier, they are powerful reducing agents. Alkaline earth metals also react with oxygen, though not as rapidly as Group 1 metals; these reactions also require heating. In these reactions, the elements that react with oxygen are all metals . Reaction with sulphur. Reaction with oxygen. You will find this discussed on the page about electronegativity. M (s)----> M 2+ (aq) + 2e- 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 elements of Group 2 are beryllium, magnesium, calcium, strontium, barium, and radioactive radium. Activity 3 – The reactions of Group 2 elements - Answers6. 2Mg + O2 2MgO This needs to be cleaned off by emery paper before doing reactions with Mg ribbon. 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. Group 2: Group 2 elements are known as alkaline earth metals. Anhydrous calcium chloride is a hygroscopic substance that is used as a desiccant. B. The Hydrogen is +1 in the OH-ion and HCl, and +1 in water. Reactions of alkali metals with oxygen. 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. 2Sr (s) + O2 (g) ----> 2SrO (s) solubility of group 2 hydroxides increase down the group. Since the alkali metals are the most electropositive (the least electronegative) of elements, they react with a great variety of nonmetals. 1. There is a diagonal relationship between lithium and magnesium. 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) Ca + 1/2O 2 → CaO Mg + 1/2O 2 → MgO. A reducing agent is the compound that gets oxidised in the reaction and, therefore, loses electrons. Email info@curriculum-press.co.uk Phone 01952 271 318 Resources Topic 4A: The elements of Groups 1 and 2. Chemical world. They react violently in pure oxygen producing a white ionic oxide. Mg + 2 H2O Mg(OH) 2 + H2 This is a much slower reaction than the reaction with steam and there is no flame. 2.11.3 investigate and describe the reactions of the elements with oxygen, water and dilute acids; Republic of Ireland. MgO + 2HCl MgCl 2 + H 2O Reactions with oxygen. Teacher instructions4. All Group 2 elements tarnish in air to form a coating of the metal oxide. 3.1 The periodic table. The products of these reactions are what we might expect. Reaction of iodine with air. Reaction of iodine with water. Group 1, 2 and lanthanides form basic compounds of oxygen when they react with dioxygen. 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. Acidic oxide: Na 2 O + H 2 O → 2NaOH. Lithium's reactions are often rather like those of the Group 2 metals. 2Mg + O 2MgO Mg will also react with warm water, giving a different magnesium hydroxide product. Science. Chemistry. 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. **By the end of this lesson students should be able to: **1. Reaction with acids. 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. These elements are divided into two categories i.e, alkali metals or group 1 elements and alkaline earth metals or group 2 elements. 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. When these metals (M) are heated in oxygen they burn vigorously to produce a white ionic oxide, M2+O2-. Junior Cycle. It also deals very briefly with the reactions of the elements with chlorine. It explains why it is difficult to observe many tidy patterns. This is compared to non-metals when the reactivity decreases working down a non-metal group such as group 7. metal oxides + water The Facts The reactions with oxygen Formation of simple oxides This is an A2 Chemistry PowerPoint Presentation on period 3 elements – reactions with oxygen. Magnesium is group 2, iron is group 8 and copper is group 11. 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. Reaction with halogens. 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. Systems and interactions. 2M(s) + O The Group II elements are powerful reducing agents. Mg burns with a bright white flame. 2.11 Group II elements and their compounds. In this video I take a look at some of the different ways in which group 2 elements can react. The Chemistry of Group 2. eg. They have a low enthalpy of ionization and high electropositive character, the alkaline earth metals have a strong tendency to lose valence electrons. with acid to produce hydrogen gas and the corresponding halide salt. x This means that what ever they react with must gain electrons. Learner Activities10 This is important as elements in the same group will react similarly. Group 2 reactions Reactivity of group 2 metals increases down the group Mg will also react slowly with oxygen without a flame. Ba + H2O ---> Ba(OH)2 + H2. The rest of Group II metals react with increasing vigorous going down the Group Which chemical reactions are likely to have an element as one of its products? The group 2 metals will burn in oxygen. To know the reaction between group 2 metal oxides and water **2. The Group 1 elements, also known as the alkali metals, all react vigorously with water to produce an alkaline solution. 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.. 3. know the reactions of the elements Mg to Ba in Group 2 with oxygen, chlorine and water; OCR Chemistry A. Module 3: Periodic table and energy. These compounds readily react with water except a few exceptions. 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. The group 2 consists of the elements beryllium(Be), magnesium(mg), calcium(Ca), strontium(Sr), barium(Ba) and radium(Ra). In these two lessons we show how Group II metals burn in oxygen and how the metal oxides formed react with water. These compounds are usually ionic in nature. 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)? 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. Activity 1: – Reactions and properties of Group 2 elements - Answers4. Mg ribbon will often have a thin layer of magnesium oxide on it formed by reaction with oxygen. It also deals very briefly with the reactions of the elements with chlorine. In reactions of elements with the oxygen, we get products –oxides. M = Mg, Ca, Sr,Ba --> I will be using 'M' as the general symbol for a Group II element in this topic. e.g. This property is known as deliquescence. (i) The Reactions of Group 2 Elements with Oxygen. It explains why it is difficult to observe many tidy patterns. 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