Topic: Air - composition and properties pt 2

Target group

Elementary school student (grades 7. and 8.)

Core curriculum:

Elementary school. Chemistry.

IV. Oxygen, hydrogen and their chemical compounds. Air. Pupil:

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 confirms experimentally that air is a mixture of substances

Key competences

• communication in the mother tongue;

• communication in foreign languages;

• mathematical competence and basic competences in science and technology;

• digital competence;

• learning to learn.

Criteria for success
The student will learn:

• to present a short history of discoveries related to the issue of air;

• how to describe air properties;

• to give examples of the use of gases in air in everyday life;

• to plan and conduct experiments to examine the basic properties of air;

• to safely use laboratory equipment and chemical reagents.

Methods/techniques

• activating

  • discussion.

• expository

  • talk.

• exposing

  • film.

• 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;

• projector;

• interactive whiteboard, tablets/computers;

• methodician or green, yellow and red cards;

• equipment, laboratory glass and reagents for the experiment.

Lesson plan overview

Introduction

1. The teacher hands out Methodology Guide or green, yellow and red sheets of paper to the students to be used during the work based on a traffic light technique. He presents the aims of the lesson in the student's language on a multimedia presentation and discusses the criteria of success (aims of the lesson and success criteria can be send to students via e‑mail or posted on Facebook, so that students will be able to manage their portfolio).

2. The teacher together with the students determines the topic – based on the previously presented lesson aims – and then writes it on the interactive whiteboard/blackboard. Students write the topic in the notebook.

3. Health and safety – before starting the experiments, students familiarise themselves with the safety data sheets of the substances that will be used during the lesson. The teacher points out the need to be careful when working with them.

Realization

1. The lecturer goes to the issue of the history of air components research and displays the „History” recording and the „Timeline” widget, starting the discussion.

2. The teacher briefly discusses the properties of the air, reminding students of the news. Conducts the experiment „Testing air properties” (note in the methodical commentary). Before the actions, he asks the students to formulate a research question and select the hypothesis and record them in the observation diary in abstract. He instructs them to carefully observe the changes taking place during the experiment. At the end of the study, he begins a discussion regarding observations and conclusions. Students make entries in the observation diaries.

3. The teacher conducts the „Air Electrical Conductivity Study” experiment according to the instructions described in the abstract in the experiment. Before the test, the students formulate a research question and a hypothesis. They observe changes during the experiment, they formulate the application and record it in the observation diaries.

4. Summing up the information on air properties, the teacher displays on the multimedia table the table „Selected properties of air and its components” (part 1 of the abstract) and asks students to analyze it.

5. Teacher translates, writing on the board, how to calculate the volume of, for example, oxygen, which is a component of the air, in a room with dimensions of 5 mx 4 mx 3 m.

Summary

1. The teacher asks the students to finish the following sentences:

   • Today I learned ...

   • I understood that …

   • It surprised me …

   • I found out ...

   The teacher can use the interactive whiteboard in the abstract or instruct students to work with it

Homework

1. Listen to the abstract recording at home. Pay attention to pronunciation, accent and intonation. Learn to pronounce the words learned during the lesson.

2. Make at home a note from the lesson using the sketchnoting method.

The following terms and recordings will be used during this lesson

Terms

Texts and recordings

Air - composition and properties pt 2

• 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.