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- 建立时间: 2007-11-20
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3.1 Solubility(first period of lesson)
2007-11-20
3.1 Solubility(first period of lesson)
Teaching purpose:
Knowledge: Make students to understand the concept of solubility .Find out the effect of temperature on the solubility of solid, and the meaning of the curve of solubility. Introduce the effect of temperature on the solubility of substance and pressure.
Capability: Train the ability of observe, analysis, conclude of the students
Teaching on thinking: to educate student study surefooted.
Key-point: to form the concept of solubility. Understand the concept of the solubility of solid, and be able to differentiate the concept on solubility and solvency.
Teaching method: Use heuristic teaching base on the students.
Teaching appliance:
Apparatus: Balance, poise, measuring cylinder, beaker, stirrer, alcohol burner, asbestos web, tripod and thermometer.
Chemical: Sodium chloride, potassium nitrate.
Others: sugar, oil, petrol, distilled water, match.
Teaching process
Teacher’s activities
Students’ activities
Teaching intention
【quiz】We discuss the saturation under which precondition have a actual meaning?
Recall then point out the precondition.
Review, the saturated and unsaturated solutions are relatively.
【student experiment】
Experiment 1：add the sugar and oil to two beakers which half filled with water respectively.
Do the experiment by groups, observe the dissolution and make conclusion.
Educe the conclusion on different substance have different solubility in water by the students.
Experiment 2：add the sugar and oil to two beakers which half filled with petrol respectively.
Same as above
Educe the conclusion on different substance have different solubility in petrol by the students.
【summary】We know that different solute have different solubility in different solvent by go through the experiments.
Introduce the new lesson.
【writing on the whiteboard】Lesson three Solubility
Concept：textbook P·134
Read through the textbook P·134，Find out the concept in original text.
Let the students understand the concept further.
【discuss】What is the factor that affect the solubility
Base on the experiment discuss out the conclusion and response.
Educe the factors which affect the solubility by the students：The property of solute and solvent.
【Introduce】resolvable is simply means the property of the substance. How to measure the solubility of substance? Let us work out the solubility of a substance.
Follow the teacher’s concept, and transition naturally.
Transit to the teaching of solubility.
【writing on the whiteboard】Two、Solubility of solid
【student experiment】
Experiment 3, add the sodium chloride to the beaker which contains of 20℃ water, and add potassium nitrate to the beaker which contains of 40℃ water to saturate.
Do the experiment by groups，compare the conditions, and discuss whether we can compare the solubility of the two substances or not.
The first factor to measure the solubility of substance: under certain temperature.
Teacher’s activity
Students’ activity
Teaching intention
Experiment 4, add sodium chloride to 40g of water in 20℃，and add potassium nitrate to 100g of water in 20℃ to saturate.
Experiment 5： add sodium chloride to 100g of water in 20℃ to saturate.； add potassium nitrate to 100g of water in 20℃ ,make it to unsaturated solution.
Same as above.
The second factor to measure the solubility of substance：In the same volume of solution viz. 100 g of solution。
The third factor to measure the solubility of substance：make the solution to saturate。
【summary】After discuss, we know that to measure the solubility must satisfy the four factors.
Link the experiments above and teacher’s makeup, to conclude the four factors of solubility.
To train the ability of analyze, compare, and conclude of the students.
【writing on the whiteboard】1.concept：textbook P·134
Read textbook P·134，Find the concept of solubility, and explain it in your own words.
Make the students understand the concept deeply.
【transition】let us find out the accustomed classify of the solubility.
Read textbook P·135，Find out the division of diffluent, dissoluble, sparingly soluble, and insoluble.
Train student’s self-study, and the practical and realistic attitude to science.
【exercise】class exercise
【transition】we have learnt the solubility ,and how to present the solubility？
Do the exercise during the lesson.
Transition naturally，read textbook P·135 form 7-1，Find out the relationship between temperature and solubility.
Introduce the first method of expression on solubility to the students：draw table
Instruct the students to draw the curve table of solubility。
Base on the data of the form 7-1，temperature is on x-axis，solubility is on y-axis, and sketch the curve.
Let students understand the meaning of the curve.
【writing on the whiteboard】2.The expression of solubility.
（1）draw table（2）curve of solubility
【transition】we work out the solubility of solid above，so how to present the solubility of gas?
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