Topic: Preparation, properties and application of carbon dioxide

Target group

Elementary school student (grades 7. and 8.)

Core curriculum:

General aim of education

The student discusses the preparation, properties and use of carbon dioxide.

Key competences

• communication in foreign languages;

• digital competence;

• learning to learn.

Criteria for success
The student will learn:

• to name the sources of carbon dioxide;

• to write down the molecular and structural formula of carbon dioxide;

• to plan and conduct experiment allowing to obtain and identify carbon dioxide;

• to design and conduct experiments to examine the basic properties of carbon dioxide.

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;

• interactive whiteboard, tablets/computers.

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. Students watch the film titled „Receiving and researching properties carbon dioxide”. After the screening, referring to observations and conclusions, the teacher encourages young people to discuss.

2. Work in pairs. Analysis of the diagram showing the most important information about carbon dioxide.

3. The teacher recalls the class participants to the abstract and asks for familiarization with the experiment instructions 2. He divides the students into groups and distributes the appropriate equipment, glass and reagents to perform the experiment. Students follow the instructions. They write their observations in notebooks and check if their observations coincide with the summary of the experiment in the abstract.

4. Students, working in pairs, carry out task number 2: in the form in the abstract they write a suggestion a way to detect the presence of carbon dioxide. The teacher makes sure that the task have been correctly completed and gives feedback.

5. Students, working in groups, perform experiment number 3 according to the instructions in the abstract. They write their observations and conclusions in the form. The students present the results of work in groups, the teacher corrects possible mistakes.

6. Students read the fragment titled „Application of carbon dioxide”. Then, working in pairs, they create an infographic illustrating the information learned.

7. Students perform an interactive exercise. The volunteer discusses the correct solution.

Summary

1. The teacher plays the recording of the abstract. Every now and then he stops it, asking the students to tell in their own words what they have just heard. In this way, students consolidate information learned during the lesson and practice listening comprehension.

2. The teacher asks a willing student to summarize the lesson from his point of view. He asks other students if they would like to add anything to their colleague's statements.

Homework

1. Carry out task number nr 4.1.

The following terms and recordings will be used during this lesson

Terms

Texts and recordings

Preparation, properties and application of carbon dioxide

What do we know about carbon dioxide this far?

Dry ice and sublimation

Solid $\text{C}{\text{O}}_{\text{2}}$ looks like ice, but instead of melting, it sublimates, forming carbon dioxide, hence the name dry ice.

Carbon dioxide is a gas that is well soluble in water, so it has been used in the food industry for the production of fizzy drinks. Carbon dioxide does not support combustion and blows out fire, so it is used in foam extinguishers (as a carrier gas) and in carbon‑dioxide extinguishers (as a fire extinguisher).

Solidified carbon dioxide is a cooling agent used during transport and storage of food products, in particular fruit and vegetables. Due to the low temperature, it contributes to the inhibition of the growth of bacteria and fungi. Dry ice is also used in medicine for storing preparations and vaccines and in cryotherapy (cold treatment).

Sparkling water

In 1767, John Priestley discovered a way to saturate water with carbon dioxide by hanging a bowl of water over a vat of beer. The water prepared in this way had a pleasant taste, and Priestley announced his discovery in the press. In the article, he described the production of sparkling water, consisting of adding acid to chalk to produce carbon dioxide, and then saturating water with it.

At the end of the 18th century, Johann J. Schweppe mastered this technology and sparkling water was produced by saturating the water with carbon dioxide under pressure. Higher pressure increases the solubility of carbon dioxide compared to atmospheric pressure conditions. After opening the bottle, the pressure is levelled, which causes the gas to escape from the solution, creating characteristic bubbles (source).

• Carbon dioxide is a component of the air. Its content in the air is variable. It is created in the processes of breathing, fermentation and combustion.

• Under the influence of sunlight, in the presence of chlorophyll found in cells, carbon dioxide with the help of water transforms into oxygen and glucose. This process is called photosynthesis.

• Carbon dioxide is a colourless gas, well soluble in water, with a density about 1.5 times higher than the density of air. It does not combust and does not support combustion.

• Carbon dioxide is used as a refrigerant, extinguishing agent, gas for filling life jackets and salvage pontoons.

• Carbon dioxide is not a toxic gas, but its high concentration can even cause death.