Methodological recommendations for Summative Assessment on the subject «Chemistry» (social-humanitarian direction)
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SUMMATIVE ASSESSMENT FOR THE TERM 2 Summative Assessment for the unit 10.2A “Regularities of chemical reactions” Learning objectives 10.2.3.2 Be able to compose oxidation and reduction equations using the electronic balance method 10.2.3.5 Be able to plot diagrams for the electrolysis of melts and solutions 10.3.4.1 Prove the qualitative composition of solutions of acids, hydroxides and salts according to the pH of solutions 10.3.1.1 Be able to classify chemical reactions by their thermal effect Assessment criteria A learner Write oxidation and reduction equations using the electronic balance method Draw diagrams for the electrolysis of solutions and molten compounds Describe the qualitative composition of solutions of acids, hydroxides and salts according to the ph of solutions Classify chemical reactions by their thermal effect Level of thinking skills Knowledge and comprehension Application Higher order thinking skills Duration 20 minutes Task 1. (a) Use the electronic balance method to complete these equations. (i) H2SO4 + HI → S + I2 + H2O (ii) HBr + H2SO4 → Br2 + SO2 + H2O (iii) V3+ + I2 + H2O → VO2+ + I– + H+ 2. Identify the anode and cathode products during the electrolysis of aqueous Na2SO4 solution. 3. (a) Describe the acid–base nature of the solutions obtained when the following compounds are added to water. Use equations to illustrate your answers. (i) sodium chloride (ii) sulfur trioxide (iii) sodium oxide (b) (i) Write an equation for the reaction of magnesium with cold water. (ii) Predict and explain the pH of the resulting solution.
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