chemistry lesson

Oxides-SUBSTANCES AND their PROPERTIES - LESSON PLANS for CHEMISTRY 11 class - lesson plans-lesson plans-author's lessons-plan-lesson summary - chemistry

The purpose of the lesson: to consolidate knowledge of classification and nomenclature; chemical properties of oxides, to teach you to make reaction equations that confirm these properties; to consolidate the skills of solving calculation problems using chemical equations and formulas.

Basic concepts: salt-forming, non-salt-forming oxide, basic, acidic, and amphoteric oxide.

Equipment: CaO, CuO, ZnO, SASO₃, S, a spoon for burning substances, a gas outlet tube, water, a set of reagents, test tubes, alcohol lamp, holder.

Lesson progress

I. Organizational moment

Setting goals and tasks for the lesson.

Analysis of the results of the test on the topic "non-Metals". Invite students to work on their mistakes.

Plan of presentation

1. Determination of the oxides. Classification, nomenclature, physical properties of oxides, chemical bond, type of crystal lattices.

2. Chemical properties: a) salt-forming oxides: basic oxides, acid oxides, amphoteric oxides; b) non-salt-forming oxides.

3. Production of oxides.

4. Solving calculation problems.

II. Front work

Remind students of the studied question about the classification of inorganic complex substances. Working with the scheme 6 p. 179 and the summary in the workbook, students remember the definition of oxides, their classification, nomenclature, features of physical properties and structure.

Write out the oxides from the given formulas: a) salt-forming: basic, acidic, amphoteric; b) non-salt-forming. Give them names.

Na₂O, N₂О₅, NaOH, HNО₃, CuO, SО₂, CO, SCl₂, Cl₂O₅, Mn₂O₇, FeS, Fe₂O₃, Cu₂O, P₂O₅, N₂O, ZnCl₂, MgO, Cr₂O₃, CrO₃, ZnO.

Answer: salt forming oxides:

a) main features:

Na₂O — sodium oxide, Withu⁺²O-copper oxide (II), Fe₂⁺³O₃ — iron oxide (III), MgO — magnesium oxide, Cu₂⁺¹O — copper oxide (I).

b) acidic oxides: N₂⁺⁵O₅oxide of nitrogen (V), S⁺⁴O₂— sulfur dioxide (IV), CL₂⁺⁵O₅oxide of chlorine (V), MP₂⁺⁷O₇ — oxide of manganese (VII), R⁺⁵O₅- phosphorus oxide (V), SG⁺⁶O₃oxide of chromium (VI).

C) amphoteric oxides: Cr₂⁺³O₃ — chromium (III) oxide, ZnO — zinc oxide.

Non-salt forming oxides: N₂⁺¹O-nitric oxide (I), C⁺²O — carbon monoxide (II).

Features of physical properties of oxides:

gaseous: SO₂, CO, N₂O;

liquid: MP₂O₇, CGO₃;

solid: N₂O₅, Fe₂O₃, CaO, P₂O₅.

By structure, type of chemical bond: covalent polar bond SO₂, CO, etc., ionic bond Na₂O, CuO, etc.

Types of crystal lattice: ionic, atomic, and molecular.

Features of chemical properties of oxides:

a) basic oxides:

Experiment:

Experiment: CaO + H₂O = Ca(HE)₂+ Q-phenolphthalein-crimson color,

b) acid oxides:

Experiment:

3) Most acid oxides react with water.

Experiment: SO₂+ N₂O = H₂SO₃-methyl orange-pink color.

SiO2₂+ N₂O ≠

C) amphoteric oxides. Manifestation of the properties of basic oxides-interact with acids and acid oxides:

Manifestation of the properties of acid oxides — interaction with soluble bases and with basic oxides:

Experiment:

Getting oxides:

2) Decomposition of oxygen-containing acids.

3) Decomposition of insoluble bases.

4) Decomposition of certain salts.

III. Do

I) which of the following substances will react with:

a) VAO; b) Al₂O₃; C) N₂O₅; SO₃; P₂O₅; CaO, NaOH, HNO₃Na₂SO₄.

Answer:

a) VAO is the main oxide:

IV. Solving calculation problems

a) according to the formula; b) the chemical equation,

a) the Mass fraction of nitrogen will be the smallest in the oxide:

N₂O, NO, NO₂, N₂O₅.

Decision:

Answer: The lowest mass fraction of nitrogen in nitric oxide is (V) N₂O₅26 %.

b) sodium Oxide weighing 12.4 g was dissolved in water. What is the volume of carbon dioxide (n.y.) will be required to neutralize the resulting solution of sodium hydroxide, if an acidic salt is formed?

Decision:

From equation (1):

From equation (2):

Answer: you will need 8,96 liters of_CO2.

V. Homework assignment

1) Summary in a notebook.

2) Draw up reaction equations confirming the properties of oxides: Li₂O, VEO, P₂O₅.

3) Task 1. Calculate the mass fraction of the element that formed oxides: manganese (II) oxide, manganese (IV) oxide, and manganese (VII) oxide. Which oxide has the highest concentration W of the element?

4) Task 2. When passing carbon monoxide (IV) through a solution of calcium hydroxide, an acidic salt — calcium bicarbonate with a mass of 8.1 g was obtained. Determine the volume of carbon monoxide (IV) (n.y), which was passed through the solution.