Topic: Synthesis reactions

Target group

Elementary school student (grades 7. and 8.)

Core curriculum:

Elementary school. Chemistry.

III. Chemical reactions. Student:

2) describes the synthesis reaction; gives examples of different types of reactions and writes relevant equations; indicates substrates and products; selects coefficients in the chemical reaction equations; observes experiences illustrating the types of reactions and formulates conclusions.

General aim of education

The student writes the equation for the synthesis reaction using symbols and chemical formulas

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 write down the synthesis reaction equations along with the selection of reaction factors, indicate substrates and reaction products;

• to show the course of synthesis reactions on models;

• to draw on the models the course of the synthesis reaction;

• to read and write the course of a chemical reaction in words;

• to follow the safety rules when performing chemical experiments;

• to describe a chemical experiment, including glass and laboratory equipment, chemicals, schema, observations and conclusions.

Methods/techniques

• expository

  • talk.

• activating

  • discussion.

• 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

• computers with internet access, or tablets;

• e‑textbook;

• interactive whiteboard, tablets/computers;

• methodician or green, yellow and red cards;

• equipment, laboratory glass and reagents - see description of the experiment in the methodical commentary;

• ball‑and‑ball models.

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 teacher, referring to the previous lesson, asks students to recall the concept of synthesis reaction and to write on the table the reaction equation using symbols (A + B).

2. The teacher informs students that they will watch the film „Study of the reaction of magnesium with iodine”. Before this happens, they are to formulate a research question and hypotheses and write them in the observation diary in abstract. After the screening, the teacher asks the students what they have observed - after joint observation and conclusions, students write them down in the abstract observation log.

3. An eager student presents the course of chemical transformation (reaction of magnesium with iodine), including substrates and products, in the form of a verbal notation. Then he writes the same equation using the symbols of the elements and the formula of the chemical compound on the board. He balances them - the teacher checks the correctness of the task performed.

4. The teacher divides the students into groups, distributes the ball‑and‑stick models. He asks for the equation of reaction from the course of the experiment presented in the film. Monitors the workflow, gives advice and checks the correctness of the task.

5. The teacher presents examples of synthesis reactions by displaying on the multimedia board a gallery showing examples of synthesis reactions and together with students discusses them.

6. The teacher divides the students into groups, distributes the ball‑and‑stick models and on the basis of a table with examples of synthesis reactions asks for the arrangement of reaction equations for individual reactions. The teacher checks the correctness of the models.

7. At the end of the lesson, the teacher asks students to do interactive exercises - individual work.

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

The following terms and recordings will be used during this lesson

Terms

Texts and recordings

Synthesis reactions

• Synthesis reaction (combination) is a type of chemical reaction that results in only one product from two or more substrates.

synthesis reaction