Topic: Neutralization reaction, part 2

Target group

Elementary school student (grades 7. and 8.)

Core curriculum:

Primary school. Chemistry.

VII. Salts. Pupil:

3) writes the equation for the salt reaction (acid + hydroxide (eg Ca(OH)Indeks dolny 2₂), acid + metal oxide, acid + metal (1 and 2 groups of the periodic table), hydroxide (NaOH, KOH, Ca(OH)Indeks dolny 2₂) + nonmetallic oxide, metal oxide + nonmetallic oxide, metal + nonmetallic) in molecular form.

General aim of education

The student explains the nature of the neutralization and salt reaction

Key competences

• communication in foreign languages;

• digital competence;

• learning to learn.

Criteria for success
The student will learn:

• show in molecular and ionic form (full and truncated) the equation of the reaction between hydrochloric acid and sodium hydroxide taking place in an aqueous solution;

• explain what the neutralization reaction is about;

• indicate substances that undergo neutralization;

• how to design and experimentally carry out the neutralization reaction on the indicated examples.

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.

Realization

1. The students consolidate the acquired information, discussing it with their nearest neighbors („tell your neighbor” method).

2. The teacher indicates the acid and the hydroxide. Instructs students to independently write and balance the equation of reactions between them, writing it down in notebooks in the form of molecular, ionic and net ionic. He asks the student to write an equation to remind the essence of the neutralization reaction from the previous lesson.

3. The teacher displays the film „Study of the reaction of slightly soluble hydroxide with acid” and then divides the students into groups. In front of him, after giving the title of the film, he asks students to write problem question, hypotheses, as well as observations and finally conclusions in the diaries of abstract observation. After the screening, he asks for a problem‑verification experiment „Testing the reaction of slightly soluble hydroxide with acid” (copper(II) hydroxide, iron(III), magnesium and aluminum hydroxide and hydrochloric acid, nitric acid, sulfuric acid) according to the instructions described in abstract. Students formulate the research question and hypotheses again. They record them in the observation diaries, and then proceed to perform the experiment in accordance with the instructions and under the teacher's control. By carefully observing the changes, they note the observations in the work sheets. They also write and balance the reaction equations. After completing the research activities, group leaders present the effects of their work. The students, with the help of the teacher, formulate the conclusions that result from the film watched and the experiment carried out, write them down. The course of exemplary group neutralization reactions is also written on the board for presentation to other students.

4. The lecturer asks students to look at the paragraph „Examples of reactions between hydroxides and acids” in the abstract to summarize the information. Particular attention is paid to the analysis of the sample response table.

5. The teacher asks students (work in pairs) to do interactive exercises in abstract.

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

2. 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

Neutralization reaction, part 2

Look at the photographs depicting reactions between hydroxides and acids. That, as you already know, the reactions of neutralization. As a result, salt forms often with water. Also read the table of examples of this type of reaction.

Examples of reactions of hydroxides with acids

The neutralization reaction allows to regulate the acidity of the solutions. Where the excess of acids is harmful, we neutralize them by acting with principles. Conversely, the excess of the base can be neutralized with acid.

• In aqueous solution, hydroxides react with acids.

• The transformation involving the reaction of hydroxide anions with hydrogen cations, resulting in inert water molecules, is called the neutralization reaction.

• The neutralization reaction produces salt and often, but not always, water.

• The neutralization reaction allows to regulate the acidity of the solutions.

• Excess acid is neutralized with a base.

• Low water soluble hydroxides also react with acids, such as, for example: sulfuric, hydrochloric, nitric.