dissolving

Information about dissolving

Published on January 4, 2008

Author: Danielle

Source: authorstream.com

Content

WATER FOR LIFE - Dissolving -:  WATER FOR LIFE - Dissolving - University of Pitesti, Romania Iosub Ion Slide2:  SUBJECTS INVOLVED Chemistry: Particles –model Solute, Dissolving, Solubility, Solvent Water as solvent Solubility in water (of liquids, solids and gases) Solutions: - diluted and concentrated solutions - saturated and unsaturated solutions Slide3:  SUBJECTS INVOLVED Physics: Diffusion: - The motion of particles in solution Influence of different factors on solubility: - Temperature - Concentration - Vaporization of the water solvent Biology: Food - Water in human body - Water and food Mathematics: Percent concentrations (%) Slide4:  GOALS IN NATIONAL CURRICULUM ATTAINED BY END OF THE SEVENTH YEAR IN SCHOOL Knowing and understanding phenomena, terminology, concepts and methods specific to the field; Developing the capacities of exploring/investigating reality and of experimenting by using instruments and procedures; Developing the capacities of analyzing and solving exercises and problems; Developing the capacities of communication by using the specific language. Slide5:  THE “WATER FOR LIFE - DISSOLVING” TLS - CHAPTERS 1. Water for life 2. The solubility in water and the properties of the solutions 3. Results of the analysis of pupils preconceptions and misunderstandings 4. Conceptions (scientific content) 5. Goals for teaching 6. Strategies and teaching proposals 7. Evaluations 8. References Slide6:  1. WATER AND LIFE -An important question: what do you need to survive: food? water? air? -Water is of major importance to all living things; in some organisms, up to 90 percent of their body weight comes from water. -Up to 60 percent of the human body is water, the brain is composed of 70 percent water, and the lungs are nearly 90 percent water. About 83 percent of our blood is water, which helps digest our food, transport waste, and control body temperature. -Each day humans must replace 2.4 litres of water, some through drinking and the rest taken by the body from the foods eaten. -The presence of dissolved oxygen in water enable aquatic organism to respire. Slide7:  2. THE SOLUBILITY IN WATER AND THE PROPERTIES OF THE WATER SOLUTIONS Water as “a good solvent” The studies of the diluted and concentrated solutions, the saturation The estimation of the solubility of different substances in water The investigation of the increase of the solubility with the increase of temperature and with the decrease of concentration of the solution Slide8:  3. RESULTS OF THE ANALYSE OF PUPILS PRECONCEPTIONS AND MISUNDERSTANDINGS Some pupils made confusions between: pure water = solution mixture = combination dissolving = chemical process dissolving = melting a dissolved substance does disappear solutes - solvents Others pupils use wrong terminology about: the solvent properties only for water the dissolving is a process without limit Slide9:  4. CONCEPTIONS OF SOLUBILITY (SCIENTIFIC CONTENT) Particles, Solute, Solvent, Solutions, Solubility, Percent concentration (%), Saturated / unsaturated solutions Diffusion … Slide10:  5. GOALS FOR TEACHING Expected aims regarding changing and development of pupils initial ideas about: - concepts and processes: “good solvent”, the limit of solubility, dissolving is not a chemical transformation, the presence of water in the structure of living organisms, … - water’s role in environment and in living organisms: transport of food between environment in living organisms, the presence of live in and around the water, the importance of protection of water resources. Slide11:  6. STRATEGIES AND TEACHING PROPOSALS Development of pupil’s ideas about the dissolving and solubility: Scientific investigation of: - the properties of some solid substance in presence of water - the temperature and concentrations influence on the dissolving Experimentation-observation: - questions for individual pupils - group discussion - report of the observed results - formative assessment Slide12:  7. EVALUATIONS Group discussions Asking questions Formulating testable hypotheses Pre-post-tests with selected questions

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