Abstract
This paper reports on an investigation of the effectiveness an intervention using several different methods for teaching solution chemistry. The teaching strategy comprised a four-step approach derived from a constructivist view of learning. A sample consisting of 44 students (18 boys and 26 girls) was selected purposively from two different Grade 9 classes in the city of Trabzon, Turkey. Data collection employed a purpose-designed ‘solution chemistry concept test’, consisting of 17 items, with the quantitative data from the survey supported by qualitative interview data. The findings suggest that using different methods embedded within the four-step constructivist-based teaching strategy enables students to refute some alternative conceptions, but does not completely eliminate student alternative conceptions for solution chemistry.
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Acknowledgments
This study was supported by Research Fund of Karadeniz Technical University, Project Number: 2005.116.002.1.
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Appendix: Sample Teaching Design
Appendix: Sample Teaching Design
Eliciting Students’ Pre-Existing Ideas
What do you firstly remember about the concepts ‘solute’, ‘solvent’ and ‘solution’? Please explain your answer.
Focusing on the Target Concept
Equipment
Beaker, Water, Salt and Oil
Directions
You will answer previous question if you carry out the following directions and questions.
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1.
Please take three beakers and add the same of the salt (1 g) into each beaker
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2.
Then pour 40 ml water into two of the beakers and stir them (Beaker B and Beaker C)
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3.
Later add a bit of oil (5 ml) into Beaker C.
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Please compare Beaker A with Beaker B. Is there any similarity and difference?
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Please compare Beaker B and Beaker C in terms of their similarities and differences?
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Which of the phase changes (solid-liquid-gas) can be observed in each beaker? Please explain your response
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Which of the beakers indicates the only phase (homogenous dispersion)? Please explain your response
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In the foregoing mixtures (Beaker B and Beaker C), which of the added matters has more amount? Please explain your response
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Could you explain the concepts ‘solute’, ‘solvent’ and ‘solution’ based on your foregoing experiences?
Challenging Students’ Ideas
In this step, teacher introduces the opposition party and the party in power at Turkish National Assembly (TBMM). The number of the party in power is more than that of the opposite party and the party in power has more effective role in coming up with an agreement point. Therefore, it ‘outweighs’ the opposition at the Turkish National Assembly. However, unless the opposition party is available, a democratic environment does not occur. Also, even if the number of the opposition is less, it checks the work done by the party in power and acts as a control mechanism. Of course, these affairs occur in Turkish National Assembly (TBMM). When we consider the concepts ‘solute’, ‘solvent’ and ‘solution’, the amount of solvent is more and determines the phase of the solution like the party in power. The amount of the solute is less, but it is necessary for constituting a solution like the opposition party. The place where solute and solvent disperse homogenously with one another is solution like Turkish National Assembly (TBMM).
Then teacher presents the subsequent analogical mapping by confirming or disconfirming their generated notions. Later, he/she demonstrates the transparent paper of types of solutions (Tables 5, 6).
Applying Newly Constructed Ideas to Similar Situations
Direction
On the basis of the earlier steps, please use your newly structured knowledge to novel situation. For the following examples, please identify solution(s) and then state their components.
Pickle water | Laundry water (water with HCl) |
Acetone and nail polish | Air |
Lime tea | Bell metal |
Carbonate drink | Steel |
Cologne | Vinegar |
Drink made of yoghurt and water | Chalk with water |
Soda | Mud with water |
Milk | Lemonade |
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Çalik, M., Ayas, A. & Coll, R.K. Investigating the Effectiveness of Teaching Methods Based on a Four-Step Constructivist Strategy. J Sci Educ Technol 19, 32–48 (2010). https://doi.org/10.1007/s10956-009-9176-0
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DOI: https://doi.org/10.1007/s10956-009-9176-0