57 SUBJECT Chemistry TOPIC FROM CURRICULUM GENERAL TOPIC: SUBTOPIC Chemical reactions LEARNING OBJECTIVES ● Understand chemical changes as chemical reactions or as material and energy changes, ● identify the reactants and products of the chemical reaction, ● understand that chemical reactions are subject to the law of conservation of mass, ● know chemical equations as records of chemical reactions and know the rules for regulating chemical equations. Use an experimental research approach or laboratory skills in the study of chemical reactions and deepen knowledge in the field of chemical safety (safe work with chemicals). ART EXPRESSIOSIONS/VISUAL FORMS USED Protection of more valuable works of art from fire, extinguishing works of art with as little damage as possible (without dust and water). SPECIAL REQUIREMENTS Vinegar, baking soda, protective equipment, glass, lighter, candle, dosing and mixing spoon. MOTIVATIONAL STAGE TITLE OF THE LESSON Fire extinguisher. ISSUE/PROBLEM (society issue, issue that is seen relevant from pupils’ perspective, issue linked to some nature phenomenon or phenomenon from pupils’ everyday life) How to put out a fire with as little damage to the object as possible? Understand that fire requires fuel, high enough temperature and oxygen, and that without one of these three fires there is none. INVESTIGATIONAL STAGE DESCRIPTION OF THE ACTIVITY Production of a device that works on the basis of a CO2 fire extinguisher and demonstration of operation on a burning candle. TASKS Model making: Vinegar (Ethanoic acid CH3COOH) is mixed with baking soda (sodium bicarbonate NaHCO3) to obtain gas 2 carbon dioxide (CO2), 2 water (H2O) and salt (sodium acetate CH3COONa) CH3COOH + NaHCO3 = 2CO2 + 2H2O + CH3COONa