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Methodological recommendations for Summative Assessment are designed to assist teachers in planning, organizing and carrying out Summative Assessment in “Chemistry” for the Grade 10 learners. Methodological recommendations are aligned with the Subject Programme and Course plan. Summative Assessment Tasks for unit will allow teachers to determine the level of the learning objectives achievement planned for the term. Methodological recommendations comprise tasks, assessment criteria with descriptors and marks for conducting Summative Assessment across the unit. This document includes possible levels of the learners’ academic achievement (rubrics). Tasks with descriptors and marks can be considered as recommendations. Methodological recommendations are designed for secondary school teachers, school administrations, educational departments’ seniors, regional and school coordinators in criteria-based assessment and others. Free access to the Internet resources such as pictures, cartoons, photos, texts, video and audio materials, etc. have been used in designing these Methodological recommendations. TASKS FOR THE SUMMATIVE ASSESSMENT FOR THE TERM 2 Summative assessment for the chapter 10.2 A “Introduction to thermodynamics”
Learning objectives 10.3.1.2 Understand that chemical reactions include processes of bond breaking and formation of new chemical bonds 10.3.1.3 Determine experimentally the change in the reaction enthalpy and calculate it based on reference data 10.3.1.4 Explain the physical meaning of the Hess’s Law and to use it to calculate changes of enthalpy of chemical reactions 10.3.1.6 Explain the change in Gibbs free energy and calculate it based on reference data 10.3.1.7 predict a spontaneous reaction behaviour by thermodynamic data
Assessment criteria A learner Use mean bond enthalpies to calculate an approximate value of ΔH for reactions in the gaseous phase Determine the experimental change of reaction enthalpy and calculate it based on reference data Explain the physical meaning of Hess's Law and be able to use it to calculate changes of enthalpy of chemical reaction Explain the balance between entropy and enthalpy which determine the feasibility of a given reaction Predict a spontaneous reaction behaviour by thermodynamic data
Level of thinking skills Application Higher order thinking skills Duration 25 minutes Tasks 1. The table below contains some mean bond enthalpy data.