OXYGEN.

1. a) List at least four physical  properties of Oxygen.

    b) List chemical properties of oxygen.

2. a) Give two equation ( examples) of when oxygen reacts with metals to form basic oxides.

    b) Give two examples in equation showing the reaction of oxygen with non-metals.

3. Show by diagram the general preparation oxygen gas in the laboratory and write the word equation for the reaction that takes place.

4. Explain at least five places where oxygen is used and their uses.

5. Oxygen was passed over heated copper;

   a) State what was observed.

   b) Write an equation for the reaction.

6. Does oxygen supper combustion? Explain briefly.

7. The appearance below was used to determine the volume of oxygen in air. About 200cm³ of air were passed repeatedly from syringe A to syringe B over heated copper turning as shown below.

                                        After sometime, the volume of Air in syringe A was 160cm³.

    a) Calculate the percentage of oxygen in the initial sample of air.

    b) Write down a word equation for the reaction that took place in the combustion.

    c) What are the possible sources of error in the experiment?

9. a) State what would be observed if a piece of burning phosphorus is lowed into a jar of Oxygen?

   b) State what is observed when blue litmus paper is introduced to the products.

10. State what happens when each of the following substance are lowered in a gas jar of oxygen and water added to the products.

a)      Burning Sodium.

b)      Ignited magnesium.

c)      Hot Iron.