Topic: Gases – a repetition lesson

Target group

Elementary school student (grades 7. and 8.)

Core curriculum

Elementary school. Chemistry.

IV. Oxygen, hydrogen and their chemical compounds. Air. The student:

8) designs and conducts experiments confirming that the air is a mixture; describes the composition and properties of air.

General aim of education

The student repeats knowledge and vocabulary within the department: Gases and their properties.

Key competences

• communication in foreign languages;

• digital competence;

• learning to learn.

Criteria for success
The student will learn:

• to ask questions and answer your friends' questions about gases and their properties.;

• to consolidate the material from the lessons: „Air– composition and properties pt 1”, „Air – composition and properties pt 2”, „ Nitrogen”, „Noble gases”, „Oxygen: obtaining”;

• to consolidate the vocabulary related to the theme of gases and their properties.

Methods/techniques

• activating

  • discussion;

  • brainstorming;

  • mind map.

• programmed

  • with computer;

  • with e‑textbook.

• practical

  • exercices concerned.

Forms of work

• individual activity;

• activity in pairs;

• activity in groups;

• collective activity.

Teaching aids

• e‑textbook;

• notebook and crayons/felt‑tip pens;

• interactive whiteboard, tablets/computers.

Before classes

1. Before the planned repetitive lesson, the teacher asks all students to recall the material of the e‑textbook from the „Air– composition and properties pt 1”, „Air – composition and properties pt 2”, „ Nitrogen”, „Noble gases”, „Oxygen: obtaining” that they can be summarized in their own words, solve tasks and take part in the discussion.

2. The teacher instructs students to prepare a crossword related to the issues raised in the abstract „Air– composition and properties pt 1” and „Air – composition and properties pt 2”.

Lesson plan overview

Introduction

1. The teacher defines the goal of the lesson and sets the criteria for success together with the students.

2. The lecturer reminds the participants of the classes what subject area the lesson will concern.

3. The teacher randomly selects three crosswords prepared by students, displays them on an interactive whiteboard and asks students to solve them. After completing the task, the students share their opinions about whether the crosswords were interesting or whether they were a good warm‑up for the repetitive lesson.

Realization

1. The teacher asks students what is included in the air. He writes down the question on the board, and the students give their suggestions during a brainstorming session. After the creative phase, ideas are verified. The teacher displays interactive puzzles (a board illustrating the composition of the air), the students arrange them and compare their proposals with the board. They supplement information if needed.

2. The teacher plays the recording „Nitrogen” (task 1). Students prepare up to three questions related to the content of the text they heard so that they can check if their colleagues understand him well. Their task will also be to prepare predicted answers to your questions.

3. The teacher divides the class into 3 groups. Each group receives the issue to develop:
   group I – properties of oxygen;
   group II – propoerties of nitrogen;
   group III – properties of noble gases.
   Students can use different sources at work. After completing the task, representatives of groups present prepared information. The other students together with the teacher verify they complete them.

4. Students perform interactive exercises in pairs on how to obtain oxygen. Then the teacher asks willing/selected students to remind them about how the experiments are carried out, during which oxygen is released.

5. Then the teacher displays the interactive board (task 3) and asks the studens to create a mind map on the use of noble gases.

6. Students, using the mechanism included in the abstract, prepare a test question for a friend or colleague about noble gases.

7. Expanding and enriching English vocabulary in the issues covered in the lesson - students perform language exercises included in the abstract. The teacher makes sure that the tasks have been correctly completed and gives feedback.

Summary

1. The student indicated by the teacher sums up the lesson, telling what he has learned and what skills he/she has been practicing.

Homework

1. Prepare 5 questions about the area that could be found on the test of the lesson.

The following terms and recordings will be used during this lesson

Terms

Texts and recordings

Gases – a repetition lesson

Links to the lessons: 1 , 2 , 3

Links to the abstracts: 1, 2, 3, 4, 5

Before you begin solving the exercises, review abstracts „Air – composition and properties pt 1”, „Air – composition and properties pt 2”, „Nitrogen”, „Noble gases”, „Oxygen: obtaining” to recall the most important information and vocabulary. Then you will be able to check your knowledge. Good luck!

• The air is a homogeneous mixture of colourless and odourless gases.

• The main components of the air are: nitrogen (78%), oxygen (21%), argon and other noble gases (0.94%), carbon dioxide and water in the form of steam.

• For the first time, the air was liquefied by Polish chemists: Karol Olszewski and Zygmunt Wróblewski.

• The air is compressible – you can easily reduce its volume. You can also expand them, or increase its volume.

• The air does not conduct electricity.

• Nitrogen is a chemical element of atomic number 7, belonging to the 15th group of the periodic table (nitrate group), has five valence electrons.

• Nitrogen is used in many industries and medicine.

• Noble gases show the least chemical activity among all known elements. This property is related to the durability of the electronic helium configuration.

• Noble gases are used, among others in lighting technology.

• Oxygen is the most common element in nature.

• Oxygen is a colorless, odorless, slightly soluble in water, chemically active gas.

• Oxygen can be obtained during thermal decomposition of potassium manganate(VII), hydrogen peroxide decomposition (in the presence of a catalyst) or water decomposition due to an electric current (water electrolysis).

• The industrial method of obtaining oxygen is to distil liquid air.