FORM ONE: AIR AND COMBUSTION( lesson 1)

LESSON ONE
Expected questions
1- Give reasons why air is a mixture of gases
2- Name processes that require air to occur
3- what is active and inactive part of air
4- In an experiment to determine percentage of active a candle was burned in a fixed volume of air. The initial volume was xcm³ and final volume ycm³
a) State and explain two observations made after sometime
b) Sodium hydroxide was used in the experiment instead of water
I) what was the role of sodium Hydroxide
II) why was sodium hydroxide used instead of water
c) write an expression used to determine the percentage of active air
d) The experimental value for percentage of active air is not equal to theoritical value . Explain
5. In an experiment to determine the percentage of active air ,a fixed volume of air was passed over heated excess copper slowly and repeatedly
a) why was air passed slowly and repeatedly through copper turnings
b) what type of reaction took place above
c) Explain the observation made at the end of the experiment
d) why was excess copper turnings used
e) Write the equation for the reaction that took place

In our LESSON TWO we will discuss
1. Rusting of iron in a fixed volume of air
2. Smouldering phosphorus in a fixed volume of air
3. How to establish presence of carbon(IV) oxide and water vapour in air


LESSON THREE
Rusting

LESSON FOUR
Laboratory preparation of oxygen gas
industrial manufacture of oxygen gas

LESSON 5
Physical properties of oxygen gas
chemical properties of oxygen gas
uses of oxygen gas