Topic: Metals and their properties part 2

Target group

Elementary school student (grades 7. and 8.)

Core curriculum

Elementary school. Chemistry.

I. Substances and their properties. Pupil:

8) classifies elements into metals and non‑metals; differentiates metals from non‑metals based on their properties.

General aim of education

The student discusses the properties of metals.

Key competences

• communication in foreign languages;

• digital competence;

• learning to learn;

• mathematical competence and basic competences in science and technology.

Criteria for success
The student will learn:

• plan experiments to compare the properties of metals;

• discuss the properties of metals.

Methods/techniques

• expository

  • talk.

• exposing

  • film.

• programmed

  • with computer;

  • with e‑textbook.

• practical

  • exercices concerned;

  • experiment.

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. Teacher, referring to previous lessons, asks students how to indicate metals in the periodic table of elements and what are the uses of metals in everyday life.

2. Students analyze the table in the abstract. They indicate metals that have the highest boiling point and metals that have the lowest melting point.

3. The teacher announces a movie entitled „Testing thermal conductivity of metals”. Instructs students to write a research question and hypothesis in the form provided in the abstract. Then it displays the video and the students record their observations and conclusions. The teacher encourages young people to discuss, referring to the presented conclusions.

4. The teacher instructs the pupils to familiarize themselves with the instruction of the experiment „Examination of metallic gloss and plasticity of metals”. Students write down the research question and hypothesis in the form provided in the abstract. After the experiment, they note their observations and conclusions. The indicated person shares them in the class forum. The teacher corrects possible mistakes.

5. 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.

6. Students read a summary of the abstract and become familiar with the content of the glossary. Then, in their own words, they define the terms indicated by the teacher.

Summary

1. Teacher asks: If there was going to be a test on the material we have covered today, what questions do you think would you have to answer? If the students do not manage to name all the most important questions, the teacher may complement their suggestions.

2. The teacher asks the students questions:

   • What did you find important and interesting in class?

   • What was easy and what was difficult?

   • How can you use the knowledge and skills you have gained today?

   Willing/selected students summarize the lesson.

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

Metals and their properties part 2

The butter placed on the fork made of stainless steel begins to melt after some time. The gradual heating of the fork by immersion in hot water caused the melting of the butter. It means that the steal from which the fork was made conducts heat. Metals are good conductors of heat.

You will need

• metals: iron nail, aluminum foil, zinc sheet, copper wire, silver plate, magnesium ribbon, lead sample, tungsten wire, tin

• scalpel or knife;

• hammer;

• anvil.

Instruction

1. Look carefully at various objects made of metals.

2. Using an anvil to immobilize the objects and carefully try to cut with a knife or tap the surface with a hammer.

3. Write down the information about their color, gloss and susceptibility to shape change.

Metals have many features in common - metallic gloss, which reflects light, giving the effect of shine, and the color of silvery‑white or silver‑gray. The exception is gold - yellow and copper - silver colored pink (well cleaned) to red‑brown.
The hardness, malleability, ductility of metals can be explained by the existence of forces that they maintain the crystal lattice. The forces of attraction between metal ions and electron cloud work in all directions. The result of this is the large ease of moving the ion in the z network one position in the other.

• Metals at room temperature are characterized by: a constant state of matter (except mercury), silvery‑white or silvery‑grey colour (with the exception of gold, copper), metallic gloss, thermal conductivity, conductivity, electric conductivity, tenacity, ductility.