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Study Matrix
Chapter: 07. Air And Atmosphere
Active vs. Inactive Components of Air
Component
Role / Category
Approximate Volume
Support for Combustion
Behavior in Lavoisier’s Bell Jar Experiment
Oxygen
Active component
1/5 (approx. volume)
Supported combustion
Used up in burning
Nitrogen
Inactive component
4/5 (approx. volume)
Did not support combustion
Remained in the bell jar
Chemical Oxidation: Fast Oxidation vs. Slow Oxidation
Point of Comparison
Fast Oxidation
Slow Oxidation
Reaction Speed
Combines with oxygen rapidly
Combines with oxygen slowly over a period of time
Heat Energy Released
Large amount of heat energy released
Very small amount of heat energy released
Light Energy Released
Light energy is released
No light energy is released
Examples
Burning or combustion
Respiration and rusting
Oxides: Metallic vs. Non-Metallic Oxides
Point of Comparison
Metallic Oxides
Non-Metallic Oxides
Reacting Elements (from text)
Magnesium, Sodium, Iron, Calcium
Carbon, Sulphur, Phosphorus, Hydrogen
Chemical Nature
Basic
Acidic
Action on Litmus
Changes red litmus to blue
Changes blue litmus to red
Example Products
Magnesium oxide, Sodium oxide, Iron oxide, Calcium oxide
Carbon dioxide, Sulphur dioxide, Phosphorus pentoxide, Water
Rusting vs. Burning
Point of Comparison
Rusting
Burning
Necessary Conditions
Both air (oxygen) and moisture (water) are necessary
Only air is necessary
Release of Heat
Small amount of heat is released
Large amount of heat is released
Nature of Process
It is a slow oxidation process
It is a fast oxidation process
Biological and Chemical Processes: Combustion vs. Respiration
Point of Comparison
Combustion (of carbon compounds)
Respiration
Nature of Reaction
Fast process
Slow process
Release of Energy
More energy is released in the form of heat and light
Less energy is released in the form of heat and chemical energy
Regulation
Artificial process; needs to be regulated
Natural and self-regulated process
Temperature Requirement
Occurs at higher temperatures
Occurs at body temperature (37°C)
Laboratory Oxygen Production: Hydrogen Peroxide vs. Potassium Chlorate
Point of Comparison
Hydrogen Peroxide (with Manganese Dioxide)
Potassium Chlorate
Heating Requirement
No heating is required
High temperature is required
Rate of Evolution
Moderate and under control
Not mentioned in text
Chemical Safety
Safe chemicals
Unsafe; heated mixture can explode if combustible impurities are present
Apparatus Risk
Safe (no risk mentioned in text)
High risk of cracking the glass apparatus due to high temperatures
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