Abstract
One of the goals of science education is to provide students with the ability to construct arguments—reasoning and thinking critically in a scientific context. Over the years, many studies have been conducted on constructing arguments in science teaching, but only few of them have dealt with studying argumentation in the laboratory. Our research focuses on the process in which students construct arguments in the chemistry laboratory while conducting various types of experiments. It was found that inquiry experiments have the potential to serve as an effective platform for formulating arguments, owing to the features of this learning environment. The discourse during inquiry-type experiments was found to be rich in arguments, whereas that during confirmatory-type experiments was found to be sparse in arguments. The arguments, which were developed during the discourse of an open inquiry experiment, focus on the hypothesis-building stage, analysis of the results, and drawing appropriate conclusions.
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Appendices
Appendices
Appendix 1—Open-ended Inquiry Experiment
The Contact between Liquids
Note: Protective glasses and gloves must be worn!
General Instructions:
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Read all the instructions well before beginning the experiment.
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Check that you have all the necessary equipment and materials at your disposal in order to conduct the experiment.
Pay strict attention regarding:
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fulfilling the instructions for carrying out stage A precisely
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recording as many observations as possible
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reporting the observations clearly and in a well-organized manner
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participation of all group members in carrying out the various tasks
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using correct and precise scientific language throughout the course
Equipment and materials:
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A Petri dish
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About 30 ml of colored water
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About 30 ml ethanol
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3 Pasteur pipettes
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A bottle of liquid soap
Stage A: The Pre-inquiry Experiments
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1.
Drip colored water with a Pasteur pipette into a Petri dish until it will cover about half the area of the base of the plate. Be sure that the other regions are dry.
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2.
Drip Ethanol with a new Pasteur pipette into the dry part of the plate until the two fluids meet.
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3.
Describe all the observations. If necessary you can add Ethanol.
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4.
Drip a drop of soap solution into the part where the colored water meets the Ethanol.
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5.
Describe what happens
Stage B: The Inquiry Step
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I
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1.
Formulate 5 varied, relevant questions that arose following the observations that were made.
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Choose one of the questions that you would like to investigate.
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Formulate this question clearly as an inquiry question, and to the extent possible, as a link between two variables.
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Clearly formulate a hypothesis that relates to the question that you chose to investigate.
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Give reasons for your hypothesis, based on correct and relevant scientific knowledge.
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2.
Plan an experiment that will check the validity of your hypothesis.
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Detail all the steps of the experiment, including the control stage.
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List the equipment and materials needed on the equipment request form.
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Consult with the teacher and make changes if necessary.
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Submit the list of equipment and materials to the laboratory technician.
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1.
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II
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3.
Get the teacher’s approval for the proposed experiment.
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Carry out the experiment that you proposed after receiving the teacher’s approval.
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Present the observations and the results in an organized form (table, diagram, graph, etc.)
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Analyze and interpret the results.
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Draw conclusions as much as possible based on the experimental results and rationalize them.
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Examine the connection between the inquiry question and the conclusions.
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4.
In the summarizing group discussion
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Express your opinion about all the stages of the inquiry (limitations, precision, etc.).
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To the extent necessary, point out the changes desirable in the inquiry process.
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List additional questions that arose following the whole process.
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Prepare your group’s summary of the experiment for presentation before the class.
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5.
In the summarizing class discussion
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Relate to our experiment by considering the reports of all the other work groups.
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6.
Ensure that the report is well organized, aesthetic, and readable.
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Enjoy the work!
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3.
Appendix 2—Confirmatory Experiment
Solubility in Water and in non Aqueous Solvents
Note: Protective glasses and gloves must be worn!
General Instructions:
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Read all the instructions well before beginning the experiment.
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Check that you have all the necessary equipment and materials at your disposal before conducting the experiment
Equipment and materials:
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3 test tubes
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Test tube support
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Cyclohexane—C6H12(l)
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Ethanol—C2H5OH(l)
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Distilled water
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Iodine—I2(s)
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Copper Sulphate—CuSO4(s)
Pay attention to:
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precisely fulfill the instructions for carrying out stage A
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record as many observations as possible
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report the observations clearly and in a well-organized manner
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have all the group members participate in carrying out the various tasks
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use correct and precise scientific language throughout the course
The experimental procedure
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1.
Fill a test tube with distilled water up to one-third its height.
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2.
Add a few grains of Copper Sulphate—CuSO4(s) and describe what you observe.
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3.
Add to the same test tube Cyclohexane—C6H12(l), in a volume similar to the volume of the water. Mix and describe what you observe.
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4.
Add a few grains of Iodine—I2(s) and describe what you observe.
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5.
Fill the second test tube with water up to one-third its height.
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6.
Add to the same test tube Ethanol—C2H5OH(l) in a volume similar to the volume of the water. Describe what you observe.
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7.
Fill the third test tube with Cyclohexane—C6H12(l) up to one-third its height.
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8.
Add to the same test tube Ethanol—C2H5OH(l), in a volume similar to the volume of the Cyclohexane. Mix and describe what you observe.
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Analyze and interpret the results based on correct and relevant scientific knowledge.
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Draw conclusions as much as possible based on the experimental results and give your reasons.
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Questions following the experiment
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a.
What can we learn from the results of the experiment about the solubility of Cyclohexane in water, and the solubility of Copper Sulphate and Iodine in water or in Cyclohexane?
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b.
Write down the equations of the dissolution reactions.
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c.
What can we learn from the results of the experiment about the solubility of Ethanol in water and Cyclohexane?
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d.
Write down the equations of the dissolution reactions.
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e.
Explain the results of the experiment using concepts belonging to the subject “structure and bonding”.
The summarizing group discussion
Express your opinion critically about all the results of the experiment (limitations, precision, etc.).
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Katchevich, D., Hofstein, A. & Mamlok-Naaman, R. Argumentation in the Chemistry Laboratory: Inquiry and Confirmatory Experiments. Res Sci Educ 43, 317–345 (2013). https://doi.org/10.1007/s11165-011-9267-9
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DOI: https://doi.org/10.1007/s11165-011-9267-9