Ашық сабақ «Асides»

Ayazbaeva Gulbarshyn              

Short term plan

Theme of the Lesson:  Review : Acids  
Subject : chemistry Teacher name: Ayazbaeva Gulbarshyn              
Date: 28.03.18 Class:
Lesson objectives

 

Give the сoncepts of acids and their classification, about  properties
Criteria assessment Learners achieve the aim if:

can write classification acids

can write chemical properties

Values Group work- collective, responsibility for  command work result;

Individual work- learn forever, honesty while doing self work

Connection with other subjects Science: physics, biology 
Org moment 

Warm — up

Good   moorning!  who is absent? who’s on duty? The mossay method is divided into groups  .

I. «Brain Attack»

1. Types of oxides?

2. The general formul of oxides?

3. What is oxide?

4. With what do oxides react?

 

Division into the group by the Mosaic method

 

Let is watch video

 
Prezentations  

What is an Acid?

 An acid is a substance that produces hydrogen ions, H+ in water.

 An acid therefore can conduct electricity.

 pH < 7

 It has a sour taste.

 It has a stinging feeling.

 It is corrosive.

 

Examples of Acids Names of acids Chemical formula

Hydrochloric acid — HCl In gastric juice in the stomach

Sulphuric acid -H2SO4 In car battery

Nitric acid- HNO3 In the preparation of fertilizers and explosives

Carbonic acid H2CO3 In fizzy drinks

Citric acid C6H8O7 In oranges and lemons

 

Acids                 Strong- H2SO4   HNO3     HCl

 

Strong               weak                Weak — H2CO3  HNO2

 

 

 

 

 

CHEMICAL PROPERTIES OF ACIDS

 

NEUTRALIZATION

 

An acid when reacts with a base, salt & water are produced. This reaction is called neutralization

HCl + NaOH →NaCl + H2O

 

HNO3 + NaOH → NaNO3 + H2O

 

HCl + KOH → KCl + H2O

REACTION WITH CARBONATES

 

Acid and carbonates are combined to produce salt, water and carbon dioxide

MgCO3 + 2HCl → MgCl2 + CO2 + H2O

 

CaCO3 + 2HCl → CaCl2 + CO2 + H2O

 

Na2CO3 + H2SO4 → Na2SO4 + CO2 + H2O

 

CaCO3 + H2SO4 → CaSO4 + CO2 + H2O

 

REACTION WITH BICARBONATES

 

Acid and bicarbonates are combined to produce salt, water and carbon dioxide

NaHCO3 + HCl →NaCl + CO2 + H2O

REACTION WITH METAL

 

With Zinc:

Zn + 2HCl → ZnCl2 + H2

With Aluminum:

2Al + 6HCl → 2AlCl3 + 3H2

Reaction with iron oxide:

6HCl + Fe2O3 → 2FeCl3 + 3H2O

 

 

 

 
 
Practice grop  work

Lab works.

7 properties  of acids

Introduction

Acids change the colours of indicators. The are corrosive.They react  with metals,bases  and some of the salts.

Materials Sulfuric acid solution ,methylorang indicator ,piece of chalk, aluminium pieces.

Procedure

1. Pour 20ml of  Sulfuric acid  solution into the beaker,check  whith  methylorang indicator .

2. Add 3-4 pieces of aluminium pieces to the sulfuric acid solution .

3.Repeat procedure with adding 5 g of chalk into solution of Sulfuric acid  .

Observation  and guestions

1.      Write eguation of chemical reaction

2.      Try to explain colour change of litmus  paper indicator  after the reaction.

   

 

 

            Oxide Types acides end equation and equation
H2 PO4 P2O5 +H2O→
H2 CO3 H2O+CO2
H 2SO3 SO3+Na2O→
HSO4 N2O+ H2O→
H NO3 HCl+NaOH→
HCl N 2O5+ H2O→
HCOOH
Assessment criteria      Descriptors

fully describes acids

end of lesson will respond to questions on a new topic by using the pen medium
home work Acids
End of the lesson

reflection

writes the effect on the lessons to the smileys

 

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