Topic: Reaction of oxides with acids and bases

Target group

Elementary school student (grades 7. and 8.)

Core curriculum:

Primary school. Chemistry.

VII. Salts. Student:

3) writes the equation for the reaction of obtaining salt (acid + hydroxide (e.g. Ca(OH)Indeks dolny 2₂), acid + metal oxide, acid + metal (1st and 2nd groups of the periodic table), hydroxide (NaOH, KOH, Ca(OH)Indeks dolny 2₂) + non‑metal oxide, metal oxide + non‑metal oxide, metal + non‑metal) in molecular form;

General aim of education

The student investigates and describes selected physical and chemical properties of ethane (acetic) and formic acid

Key competences

• communication in foreign languages;

• digital competence;

• learning to learn.

Criteria for success
The student will learn:

• write verbally the reaction equations: acid + metal oxide, hydroxide + nonmetal oxide;

• describe by means of equations the preparation of salts in the reaction of certain metal oxides with acids and some of the non‑metal oxides with bases;

• how to design and carry out the experience of the salt reaction reaction using the following methods: acid + metal oxide, hydroxide + nonmetal oxide.

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;

• methodician or green, yellow and red cards.

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. Students will get acquainted with the content of the abstract. The teacher pays special attention to the reactions of metal oxides with acids..

2. The teacher discusses the effect of hydrochloric acid on calcium oxide and magnesium oxide with nitric acid. Saves and explains individual reactions on the board..

3. The students perform Experiment, write in notebooks observations and conclusions.

4. The teacher announces a movie. He instructs his pupils to write a research question and a hypothesis in the form provided in the abstract. Then he plays the video and the students note their observations and conclusions. The teacher points the person who shares his insights and explains the reasonableness of the conclusions noted.

5. By means of equations, the teacher explains the preparation of salts in reactions with certain oxides of non‑metals with bases.

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 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

Reaction of oxides with acids and bases

Metal oxides react with acids. This reaction produces salt and water. The following chemical equations are examples of these transformations:

${{\text{Fe}}_{\text{2}}\text{O}}_{\text{3}}\text{ + 3}{{\text{H}}_{\text{2}}\text{SO}}_{\text{4}}\text{ → }{\text{Fe}}_{\text{2}}\text{(}{\text{SO}}_{\text{4}}{\text{)}}_{\text{3}}\text{ + }{\text{3H}}_{\text{2}}\text{O}$

$\text{iron(III) oxide + sulfuric acid → iron(III) sulfate + water}$

$\text{CaO}\text{ + 2H}{\text{NO}}_{\text{3}}\text{ → Ca}{{\text{(NO}}_{\text{3}}\text{)}}_{\text{2}}\text{ + }{\text{H}}_{\text{2}}\text{O}$

$\text{calcium oxide + nitric acid → calcium nitrate + water}$

${\text{Li}}_{\text{2}}\text{O + 2HCl → }\text{2LiCl + }{\text{H}}_{\text{2}}\text{O}$

$\text{lithium oxide + hydrochloric acid → lithium chloride + water}$

Oxides of non‑metals that react with water to form acids also react with bases. The results of these reactions are salt and water respectively. Examples of these reactions are illustrated in the equations below:

${\text{CO}}_{\text{2}}\text{ + 2NaOH → }{\text{Na}}_{\text{2}}{\text{CO}}_{\text{3}}\text{ + }{\text{H}}_{\text{2}}\text{O}$

$\text{carbon dioxide + sodium hydroxide → sodium carbonate + water}$

${\text{SO}}_{\text{2}}\text{ + 2KOH →}{\text{K}}_{\text{2}}\text{S}{\text{O}}_{\text{3}}\text{ + }{\text{H}}_{\text{2}}\text{O}$

$\text{sulfur dioxide + potassium hydroxide → potassium sulfate + water}$

${\text{SO}}_{\text{3}}\text{ + }{\text{Ba(OH)}}_{\text{2}}\text{ → Ba}{\text{SO}}_{\text{4}}\text{↓ + }{\text{H}}_{\text{2}}\text{O}$

$\text{sulfur dioxide + barium hydroxide → barium sulfate + water}$

${{\text{P}}_{\text{4}}\text{O}}_{\text{10}}\text{ + 12KOH → }{\text{4K}}_{\text{3}}\text{P}{\text{O}}_{\text{4}}\text{ + }{\text{6H}}_{\text{2}}\text{O}$

$\text{phosphorus pentoxide + potassium hydroxide → potassium phosphate + water}$

• Oxides of non‑metals that react with water to form acids also react with bases. This reaction produces salt and water.

• Metal oxides react with acids. These reactions produce salt and water.