SECTION C     QUESTION 5 The following photo shows the results obtained after litmus paper was used to determine the pH of two different substances A and B. Right click on the blue button below to view the photo of the results in a new tab to answer the questions that follow:           

4.2 Write a chemical equation for the reaction of phosphorus with oxygen (you do not need to balance the equation). (2)

5.2 What will the pH value be of a substance that is a weak base?   (1)

4.6 What is the name of the product of this reaction mentioned in question 4.5? (1)  

2.5 Metal hydroxides from group 2 on the periodic table will have the formula MOH.   (1)  

Click on the button below to view the periodic table of elements and answer the question that follows. Right click on the blue button below to view the periodic table of elements in a new tab:       4.7 In which period is phosphorus found on the periodic table? (1)

6.2 Complete the following chemical equation by writing the correct chemical formula in the spaces provided. CaCO3  + [1] → CaCl2+ [2]+ [3] (3)

2.2 An example of a neutral substance is cooking oil. (1)  

6.4 Complete the following chemical equation by writing down the names of the products in the space provided. Hydrochloric acid + magnesium oxide → [1] + [2] (2)

4.4 Why does phosphorus react spectacularly with oxygen?  (1)