M = Mg, Ca, Sr,Ba --> I will be using 'M' as the general symbol for a Group II element in this topic. Group 2: Group 2 elements are known as alkaline earth metals. Topic 4A: The elements of Groups 1 and 2. 3.1 The periodic table. Reactions of alkali metals 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. Ca + 1/2O 2 → CaO Mg + 1/2O 2 → MgO. As I said earlier, they are powerful reducing agents. 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. ... State and explain the trend in melting points of the elements down Group II from Mg to Ba. This property is known as deliquescence. 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. 2.11 Group II elements and their compounds. Group 1, 2 and lanthanides form basic compounds of oxygen when they react with dioxygen. Chemistry. Activity 2 – Thermal stability of Group 2 carbonates - Answers5. 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. 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. Activity 1: – Reactions and properties of Group 2 elements - Answers4. 2Mg + O 2MgO Mg will also react with warm water, giving a different magnesium hydroxide product. The rest of Group II metals react with increasing vigorous going down the Group 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. You will find this discussed on the page about electronegativity. The products of these reactions are what we might expect. In reactions of elements with the oxygen, we get products –oxides. These elements are divided into two categories i.e, alkali metals or group 1 elements and alkaline earth metals or group 2 elements. This is compared to non-metals when the reactivity decreases working down a non-metal group such as group 7. There is a diagonal relationship between lithium and magnesium. The Facts The reactions with oxygen Formation of simple oxides Junior Cycle. 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. In these reactions, the elements that react with oxygen are all metals . 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 3 – The reactions of Group 2 elements - Answers6. Compare this with the coloured compounds of most transition metals. Ca + Cl 2 → CaCl 2. 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. These compounds are usually ionic in nature. Part of. Lesson 2: Group 2 Compounds. Chemical properties. 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. 2 Mg(s) + O 2 (g) 2 MgO(s) Calcium, strontium, and barium can also form peroxides. Reaction of iodine with water. 1.3.2 (a) Redox Reactions of Group 2 Metals. with acid to produce hydrogen gas and the corresponding halide salt. Group 2 reactions Reactivity of group 2 metals increases down the group Mg will also react slowly with oxygen without a flame. B. The group 2 consists of the elements beryllium(Be), magnesium(mg), calcium(Ca), strontium(Sr), barium(Ba) and radium(Ra). To know the reaction between group 2 metal oxides and water **2. Alkaline earth metals also react with oxygen, though not as rapidly as Group 1 metals; these reactions also require heating. Test yourself questions - Answers8. 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. Na 2 O + H 2 O → 2NaOH. Which chemical reactions are likely to have an element as one of its products? 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.. The Group 1 elements, also known as the alkali metals, all react vigorously with water to produce an alkaline solution. Teacher instructions4. The group 2 metals will burn in oxygen. MgO + 2HCl MgCl 2 + H 2O Reactions with oxygen. It explains why it is difficult to observe many tidy patterns. 2.11.3 investigate and describe the reactions of the elements with oxygen, water and dilute acids; Republic of Ireland. reacts with water. The general electronic configuration of these elements is ns 1 and ns 2 respectively. All Group 2 elements tarnish in air to form a coating of the metal oxide. Investigate reactions between acids and bases; use indicators and the pH scale; Leaving Certificate. Magnesium is group 2, iron is group 8 and copper is group 11. This is an A2 Chemistry PowerPoint Presentation on period 3 elements – reactions with oxygen. In this video I take a look at some of the different ways in which group 2 elements can react. Science. The Hydrogen is +1 in the OH-ion and HCl, and +1 in water. 1. M (s)----> M 2+ (aq) + 2e- 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. 2M(s) + O The Chemistry of Group 2. These compounds readily react with water except a few exceptions. Lithium's reactions are often rather like those of the Group 2 metals. 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. x This means that what ever they react with must gain electrons. 3.1.2 (d, e) Reaction of Group 2 Oxides with Water and Group 2 compounds as Bases. They react violently in pure oxygen producing a white ionic oxide. Email info@curriculum-press.co.uk Phone 01952 271 318 Resources 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. Mg + 2 H2O Mg(OH) 2 + H2 This is a much slower reaction than the reaction with steam and there is no flame. 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. Since the alkali metals are the most electropositive (the least electronegative) of elements, they react with a great variety of nonmetals. Ba + H2O ---> Ba(OH)2 + H2. 2Mg + O2 2MgO This needs to be cleaned off by emery paper before doing reactions with Mg ribbon. 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. Mg + H2O ---> Mg(OH)2 + H2. metal oxides + water Acidic oxide: Reaction of iodine with air. 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)? Reaction with oxygen. Reaction with halogens. (3) Both group 1 and group 2 elements produce white ionic compounds. **By the end of this lesson students should be able to: **1. e.g. 8. The Group II elements are powerful reducing agents. This is important as elements in the same group will react similarly. 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. (i) The Reactions of Group 2 Elements with Oxygen. It also deals very briefly with the reactions of the elements with chlorine. In these two lessons we show how Group II metals burn in oxygen and how the metal oxides formed react with water. Reaction with sulphur. Mg ribbon will often have a thin layer of magnesium oxide on it formed by reaction with oxygen. The reaction with oxygen. Mg burns with a bright white flame. During the formation of these compounds, a large amount of energy is released. Learner Activities10 8 The Alkaline Earth Metals (Group 2) The alkaline earth metals react (quite violently!) Beryllium reacts slowly with acids and has no reaction at room temperature. 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. Their oxides and hydroxides are alkaline in nature. They have a low enthalpy of ionization and high electropositive character, the alkaline earth metals have a strong tendency to lose valence electrons. Chemical world. 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. The elements of Group 2 are beryllium, magnesium, calcium, strontium, barium, and radioactive radium. 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) It explains why it is difficult to observe many tidy patterns. Examples: M 2 O 3, MO 2, ThO 2. Reaction with acids. When these metals (M) are heated in oxygen they burn vigorously to produce a white ionic oxide, M2+O2-. A reducing agent is the compound that gets oxidised in the reaction and, therefore, loses electrons. Anhydrous calcium chloride is a hygroscopic substance that is used as a desiccant. Exposed to air, it will absorb water vapour from the air, forming a solution. It also deals very briefly with the reactions of the elements with chlorine. eg. 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. 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. The Oxygen is -2 in the OH-ion, and -2 in water. Systems and interactions. Because they are not as active as the alkali metals, most of these elements form oxides. 2Sr (s) + O2 (g) ----> 2SrO (s) solubility of group 2 hydroxides increase down the group. Reactions also require heating and HCl, and +1 in water those of the elements oxygen! Oxides and water * * 2 Ba ( OH ) 2 + H2 ;. 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