Topic: Density of substances and their mixtures in an everyday life: calculations

Target group

Elementary school student (grades 7. and 8.)

Core curriculum:

Primary school. Chemistry.

I. Substances and their properties. Pupil:

10) performs calculations using the terms: mass, density and volume.

General aim of education

The student carries out calculations using the terms mass, density and volume.

Key competences

• communication in foreign languages;

• digital competence;

• learning to learn.

Criteria for success
The student will learn:

• to explain on the basis of the internal structure why the density of solids is greater than the density of gases;

• to carry out calculations regarding mass, density and volume.

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. The teacher asks students to do exercise # 1. Begins a brief discussion, asking students questions in the task order.

2. The lecturer announces a film titled „States of matter: Oxygen”. He instructs his pupils to write a research question and a hypothesis in the form provided in the abstract. Then it displays the video and the students record their observations and conclusions. The teacher indicates the person who shares his insights and explains the reasonableness of the conclusions he has made.

3. The teacher asks students to read the fragments of the abstract: „Mass”, „Volume” and „Density”. Then it plays the teacher's recording. At a later stage, the participants of the classes, working in pairs, ask each other about the knowledge of fragments.

4. The teacher instructs students to view presentations on the mass, volume and density calculations in the abstract and to carry out exercises 2‑4. Selected people discuss the correct exercise solutions. The instructor completes or straightens the charges of the charges.

5. At the end of the lesson, the teacher asks students to do interactive exercises - individual work. The teacher initiates a discussion, during which the correct solutions of all exercises performed by the students are discussed.

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. 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

Density of substances and their mixtures in an everyday life: calculations

Expand the next tabs and read information about mass.

Expand the next tabs and recall the information about volume.

Expand the next tabs and read information about density.

• One of the physical properties of the substance is density.

• Density is the value that characterizes a substance and its equal to the quotient of the mass and volume of a given substance.

• We can determine the substance given object was made of by experimentally determining the density of it.

• The density of a substance depends on the temperature – it generally decreases with increasing temperature.