The best teaching slide for grade 10

1. CARBON DI-OXIDE
Molecular Formula-CO2
Discovered by: Van Helmont
Proved by oxide of carbon : Antoine Lavoiser
Structure:
Electronic configuration: 1S,22S22P2

2. GENERAL METHODS OF PREPATION
1] By heating carbon.
C + O2 - CO2
2] By fuel like methane ethane propane etc.
CH4 + O2 - CO2 + H2O
3] Heating carbonates of calcium , copper , lead etc.
CaCO3 - CaO + CO2
4] By heating metallic carbonates with acid.
Na2CO3 + H2SO4 - Na2SO4 + CO2 + H2O

3. METHOD OF LAB PREPARTION

4. PRECAUTIONS
1. The apparatus should be fitted tightly.
2. Powered CaCO3 can be used for quick reaction.
3. Gas should be collected in dry, upright gas jar.
4. H2SO4 should not be used as it forms SO2 instead of H2.
5. The end of thistle funnel should be dipped in the dilute
HCL whereas the opening of delivery tube must be above
the acid level.

5. TEST OF CARBON DI-OXIDE
1. Carbon Di-oxide gas can be tested by passing the gas into
lime water which turns milky.
CO2 + Ca(OH)2 - CaCO3 + H2O
2 It can also be tested by introducing a burning matchstick or a
candle .
3 It turns wet blue litmus into red one.

6. METHOD OF INDUSTRIAL PREPRATION
Carbon di-oxide can be prepared in a large scale by heating
limestone.
CaCO3 - CaO + CO2
In above reaction lime is also formed as an by product. It is called
quick lime. If it is treated with water forms Calcium Hydroxide
called slaked lime.
CaO (Quick lime) + H2O - Ca(OH)2 (slaked lime)

7. PROPERTIES OF CARBON DI-OXIDE GAS
PHYSICAL PROPERTIES
1. Carbon dioxide is a colorless and odorless gas with mild acidic taste.
2. It is heavier than air. The caves , holes, wells , etc. are filled with this gas.
3. It is sparingly soluble in water.
4. It turns wet blue litmus into red one showing its acidic property.
5. It is neither burns nor supports burning.
6. It can be liquefied at 00 C and freezes at -780C. (dry ice)

8. PROPERTIES OF CARBON DI-OXIDE GAS
CHEMICAL PROPERTIES
1. When CO2 passes into lime water it turns milky for short
period if passed for a long time gives calcium bicarbonate.
CO2 + Ca(OH)2 - CaCO3 + H2O (short time) milky
CO2 + Ca(OH)2 - CaCO3 (long time) insoluble
2 CO2 is soluble in water and forms Carbonic acid.
CO2 + H2O - H2CO3

9. PROPERTIES OF CARBON DIOXIDE GAS
CHEMICAL PROPERTIES
3. When burning Magnesium is kept into the jar containing
CO2 gas, it burns continuously and gives Magnesium
Oxide and black carbon particles.
2Mg + CO2 - 2MgO + C
4. CO2 of the environment is used by the green plants during
photosynthesis and gives carbohydrate.
6CO2 + 6H2O - C6H12O6 + 6O2

10. PROPERTIES OF CARBON DIOXIDE GAS
CHEMICAL PROPERTIES
5.CO2 reacts with alkali and produces metallic carbonate.
CO2 + NAOH - Na2CO3 +H2O
6. CO2 gas reacts with ammonia and produces urea.
CO2 + NH3 - NH2-CO-NH2 + H2O
7. CO2 gas reacts with carbon at 9000C and gives carbon
monoxide as a poisonous gas.
CO2 + C - CO

11. PROPERTIES OF CARBON DIOXIDE GAS

12. USES OF CARBON DIOXIDE
1. Carbon dioxide is used by green plants during
photosynthesis.
2. It is used in aerated drinks like soda water, beer, etc. to
enhance the taste of drinks.
3. Dry ice is used to preserve vegetables, fruits, fish and meat .
4. It is used to prepare washing soda and urea.
5. It is used to manufacture sugar. The process is called
Carbonation.
6. It is used fire extinguisher.

13. HOW DOES FIRE EXTINGUISHER WORK?
An fire extinguisher consists of a strong cylinder which
contains a solution of sodium bicarbonate and glass bottle
with concentrated Sulphuric acid. The acid iS connected
through plunger to the knob. When knob strikes on the hard
surface plunger breaks the acid bottle. The acid and Sodium
Bicarbonate reacts and give carbon dioxide. The CO2 comes
from the nozzle of pipe to the burning surface.
NaHCO3 +H2SO4 - Na2SO4 + H2O +CO2

14. FIGURE

15. ENJOY

16. THINGS TO REMEMBER
Dry ice- when carbon dioxide gas cooled to -780 C, It changes in to ice called
dry ice.
Carbogen-the mixture of 95% oxygen and 5% carbon dioxide. used to treat
pneumonia or remove toxin.
Quick lime- dry lime.
Slaked lime- hydrated lime.
Carbonation- process of making sugar by using carbon dioxide.
Fire extinguisher- device to put-off fire
Dolomite- Dolomite is an anhydrous carbonate mineral composed
of calcium magnesium carbonate, ideally CaMg(CO3)2.
Magnesite- Magnesite is a magnesium carbonate mineral with a chemical
composition of MgCO3

17. GIVE REASONS
1) Collection by upward displacement of air - due to heavier than air.
2) Powdered calcium carbonate used- for quick reaction
3) Thistle funnel should dipped in acid – to prevent airflow through it.
4) delivery tube above acid level- to pass gas on jar.
5) Dangerous to go cave or deep hole- lack of oxygen and presence of
carbon dioxide gas being heavier.
6) Dry ice does not wet cloth or paper- evaporates and mixed in
atmosphere.

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