AS Chemistry AQA Required Practical 4 (Testing For Cations & Anions)

Group 2 and 7 (AQA)

6 full lesson bundle on the topic of **Group 2 and 7** from the **AQA AS Level Chemistry specification.** See below for the lessons and learning objectives. **Lesson 1: Group 2 Elements: Properties and Reactions** 1. To state and explain the trend in first and second ionisation energies of group 2 elements and how this links to their reactivities 2. To state and explain the trend in the melting point of group 2 elements 3. To construct equations of redox reactions of group 2 elements with water and to identify what species have been oxidised and reduced using oxidation numbers **Lesson 2: Uses of Group 2 Elements and Compounds** 1. To state the trend in solubility and alkalinity of group 2 metal hydroxides and sulfates 2. To describe the use of magnesium in the extraction of titanium from its ore 3. To describe the uses of Mg (OH)2, Ca(OH)2 and CaO/CaCO3 **Lesson 3: The Halogens: Trends in Physical & Chemical Properties** 1. To describe and explain the trend in electronegativity, boiling and melting points of the halogens 2. To describe and explain the trend in oxidising ability of halogens and reducing ability of the halide ions 3. To outline experiments to support the trend in oxidising ability of halogens **Lesson 4: Uses of Chlorine** 1. To explain the term disproportionation 2. To explain how the reaction of chlorine with water or cold dilute sodium hydroxide are examples of disproportionation reactions 3. To evaluate the uses of chlorine **Lesson 5: Reactions of Halides** 1. Describe an experiment to identify sodium halides with sulfuric acid (evidence of trend in reducing power) 2. Describe an experiment to identify metal halides with silver ions 3. Analyse various experiments (in questions) based on identifying halide ions **Lesson 6: Required Practical 4: Testing for Cations & Anions** 1. Researching the risks associated with the experiment and creating appropriate risk assessment based on your findings 2. Researching appropriate experimental methods for testing for group 2 cations, NH4+ ions, CO32- ions, SO42- ions and halide ions 3. Constructing appropriate results tables to record your observations during the experiment