Topic: Carbon and its compounds with hydrogen – pt 2

Target group

Elementary school student (grades 7. and 8.)

Core curriculum:

Elementary school. Chemistry.

VIII. Compounds of carbon with hydrogen - hydrocarbons. Pupil:

6) on the basis of the observations describes the physical and chemical properties (combustion, bromine incorporation) of ethene and ethn; searches for and uses information about their uses;

7) writes the equation of ethylene polymerization; describes the properties and applications of polyethylene.

General aim of education

The student writes and explains what the connection and polymerization reactions are.

Key competences

• communication in foreign languages;

• digital competence;

• learning to learn.

Criteria for success
The student will learn:

• recall information about alkanes, alkenes and alkynes;

• You explain what a coupling reaction is;

• you will explain the polymerization reaction.

Methods/techniques

• expository

  • talk.

• programmed

  • with computer;

  • with e‑textbook.

• practical

  • exercices concerned.

Forms of work

• individual activity;

• activity in pairs;

• 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.

Realization

1. In order to remind you of the previous lessons, the teacher asks the students questions, e.g. what is the connection reaction, what chemical compounds from hydrocarbons undergo the connection reaction, what is the mechanism of attaching elements to unsaturated compounds.

2. The lecturer presents a table with connection reactions (abstract) and invites you to its joint analysis. Then he asks those willing to the table and instructs them to write the equations of the attachment reactions on the structural formulas of the given examples, eg eten + iodine; ether + hydrogen chloride; propene + hydrogen; propyn + hydrogen fluoride, propyn + hydrogen, etc. The others write the equations of reactions in the notebooks.

3. Students will get acquainted with the fragment entitled „Polymerization reaction”. Then they explain this concept.

4. Students, working in pairs, in available sources (e.g. on the Internet) look for information on the conditions of polymerization. Selected pairs show the results of your work.

5. Students check their knowledge about carbon and its compounds with hydrogen, working with the tabs placed in the abstract.

6. Students, working individually or in pairs, carry out interactive exercises to check and consolidate knowledge learned during the lesson. Selected people discuss the correct solutions for interactive exercises. The teacher completes or straightens the statements of the proteges.

Summary

1. 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. Imagine that you have the opportunity to interview an academic - a specialist in the field of today's lesson. What questions would you like to ask him? Write them down.

The following terms and recordings will be used during this lesson

Terms

Texts and recordings

Carbon and its compounds with hydrogen – pt 2

Alkenes and alkynes are chemically active hydrocarbons. They are very easily subjected, for example, to the addition reaction. The addition reaction is the reaction of attaching the atoms of other elements, e.g. halogen (chlorine, bromine, iodine), to the molecule with multiple binding, without the separation of by‑products.

Unsaturated compounds under appropriate conditions can combine with each other to form long chains. Polymerisation involves combining many molecules (monomers) into one molecule with a very long chain (polymer). As a result of the ethylene polymerization reaction, double chemical bonds break. A molecule composed of many so‑called mers. The reaction product is polyethylene.

Polymerization of styrene.

• In unsaturated hydrocarbons we include hydrocarbons, in which molecules between carbon atoms in addition to single bonds there is one double bond (alkenes), and hydrocarbons, in which molecules between carbon atoms there is one triple bond (alkynes).

• The alkenes form a homologous series with the general formula CIndeks dolny n_nHIndeks dolny 2n_2n.

• Alkynes form a homologous series with the general formula CIndeks dolny n_nHIndeks dolny 2n‑2_2n‑2