Ашық сабақ «Асides»
Short term plan
|Theme of the Lesson:||Review : Acids|
|Subject : chemistry||Teacher name: Ayazbaeva Gulbarshyn|
|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|
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
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
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
Zn + 2HCl → ZnCl2 + H2
2Al + 6HCl → 2AlCl3 + 3H2
Reaction with iron oxide:
6HCl + Fe2O3 → 2FeCl3 + 3H2O
7 properties of acids
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.
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.
|Assessment criteria|| Descriptors
fully describes acids
|end of lesson||will respond to questions on a new topic by using the pen medium|
|End of the lesson
|writes the effect on the lessons to the smileys|