Wetting, capillary phenomena Lesson plan

Long-term plan section:

Liquid and solid bodies

School:

Teacher’s Name:

Class:

Date:

Number of attendees:

Absentees:

10

Lesson topic

Properties of the surface layer of the liquid. Wetting, capillary phenomena

Learning objectives

To define the liquid surface tension coefficient using different techniques

Evaluation Criteria

Students:

-          identify the properties of the surface layer of the liquid;

-          understand what capillary phenomena are;

-          conduct experiments to determine the surface tension.

Language goals

Vocabulary and terminology specific to the subject:

Surface layer of fluid, capillaries, wetting, surface tension ratio.

Useful expressions for conversations and writing:

“A phenomenon called surface tension ...”

- You can observe the phenomenon of surface tension ...

- Surface tension is characterized by ...

Instilling values

Expanding the outlook of students, the development of functional literacy, responsibility and autonomy in their training.

ICT skills

Power Point Presentation

Random wheel:

https://castlots.org/razdelit-na-gruppy/ https://www.jamestease.co.uk/team-generator/

Preliminary knowledge

The internal structure of the substance, fluid.

Lesson Proper

Planned Lesson Stages

Planned Lesson Activities

Resourcse

Beginning

1 min

5 min

Mutual greeting of the teacher and students through the baton (first, the teacher touches the student’s fingers of the same name alternately, starting with the thumbs and says:

• I wish (they touch my thumbs);
• success (index);
• large (medium);
• in all (nameless);
• and everywhere (little fingers);
• Hello! (touching the whole palm)Next, students in pairs do the same action.

Thus, the classroom creates a favorable atmosphere for further collaboration.

Slide 1

The teacher conducts the actualization of knowledge through a survey:

1.      What is the process of transition from a gaseous state of a substance to a liquid?

2.      What is the name of the reverse process?

3.      What factors determine the rate of evaporation of a liquid?

4.      What steam is called saturated?

5.      Why does the saturated steam pressure not depend on the volume?

6.      What steam is called unsaturated?

7.      What temperature is called critical?

8.      What process is called boiling.

9.      Why does the temperature remain constant during boiling?

10.  How does the boiling point depend on the air pressure above the liquid?

Next, the teacher brings the children to the lesson topic, learning objectives and assessment criteria through the question of fluid properties through the molecular structure.

Slides 2-5

Middle

1 min

5 min

10 min

20 min

Next, the teacher offers to share in 2 groups through a random wheel https://castlots.org/razdelit-na-gruppy/ (You can also use this link:

https://www.jamestease.co.uk/team-generator/ )

After students sit down in their groups, and the teacher gives each group a task:

Group 1:

1. Get acquainted with the article "Surface tension".

2. Answer the questions:

- What phenomenon is called surface tension?

- Where can I observe the surface tension phenomenon?

- What values ​​characterize surface tension?

3. Run the experiment:

"Study of the shape of a liquid in natural conditions."

Devices and materials: aluminum, copper, glass, paraffin plates; sunflower or olive oil; alcohol solution in water, wire, syringe or glass tube.

Group 2:

1. Get acquainted with the article "Capillary phenomena"

2. Answer the questions:

What are capillary phenomena?

Where can I see capillary phenomena?

What values ​​characterize capillary phenomena?

3. To perform the experiment: "Study of the dependence of the height of the rise of the liquid on the diameter of the capillary, on the kind of liquid.

Instruments and materials: glass tubes of different diameters, water, ruler, transparent rectangular vessel.

After completing the assignments, each group will present another progress report. The second group asks questions and makes corresponding entries in a notebook.

Perform laboratory work:

Laboratory work "Measurement of liquid surface tension"

Objective:

the study of the phenomenon of surface tension; experimental determination of the coefficient of surface tension of water by the method of separation of the loop and drops

Equipment:

DPN dynamometer with accessories; tripod for frontal work; distilled water; ruler measuring 30 cm with millimeter divisions. Content and method of work

The free surface of the liquid in a state of equilibrium tends to a minimum, the liquid is as if tightened by an elastic surface film, which tends to reduce its area.

Slides 6-7

Instruction Card

Group 1

Instruction Card

Group 2

Slide 8

End

3 min

Homework

Teacher: “When studying natural phenomena, the behavior of animals and humans, one can find many practical and interesting phenomena. In today's lesson, we learned about the properties of the surface of a liquid, became acquainted with capillary phenomena, and now from the standpoint of the knowledge gained, you can explain a wide range of phenomena. ”

Reflection. Evaluation criteria (discuss learning objectives).

The teacher asks questions to the class:

“What caused you difficulty? What is difficult for us to perceive? ”

Discussion of difficulties.

Based on the difficulties, the teacher determines the homework:

If everything is clear, then it is enough to repeat the material covered in the notebooks.If there were difficulties in perceiving the material, then the teacher suggests that the students refer to the textbook as additional material.

Differentiation - how do you plan to provide more support? What tasks do you plan to set for more capable students?

Grading - How do you plan to check students' level of learning?

Health & Safety

I plan to provide support through a general discussion of the results of work with test tasks at the beginning of the lesson, individual counseling during problem solving.

According to the results of the training tasks at the end of each lesson.

Creating a favorable psychological atmosphere, the compliance of tasks to the level of preparedness of students, the change of activities, counseling

Lesson reflection

Were the objectives of the lesson / learning objectives realistic?

Have all students reached the DH?

If not, why not?

Is the differentiation correct in the lesson?

Have the lesson temporal stages been sustained?

What were the deviations from the lesson plan and why?

Use this section to reflect on the lesson. Answer the most important questions about your lesson from the left column.

Overall rating good

What two aspects of the lesson went well (think about both teaching and learning)?

1:

2:

What could contribute to improving the lesson (think about both teaching and learning)?

1:

2:

What did I find out during the lesson about the class or the achievements / difficulties of individual students, what should I look for in subsequent lessons?