Study the flow chart below and answer the questions that follows.

(a) Write an equation for the reaction between gas X and ammonia  (1mk)

(b) Write the formulae of the substance present in the mixture Y_(aq)  (2mks)

The table below gives the rate of decay for a radioactive element M

Determine the half – life of the radioactive element M   (2mks)

Part of the structure of a polymer is given below.

(a) Identify the polymer.  (1mk)

(b) State one disadvantage of continued use of this polymer  (1mk)

Explain why aluminium metal is not extracted from aluminium chloride   (2mks)

When a current of 6.42 Amperes was passed through an electrolyte Y ²⁺ for 10 minutes, 2.74g of Y were deposited.

(a) Calculate the quantity of the electricity passed in the experiment.   (1mk)

(b) Determine the relative atomic mass of (1 faraday = 96,500 coulombs)     (2mks)

Air was passed through several reagents as shown in the flow chart below. 

(a) Write an equation for the reaction that took place in the chamber with the magnesium powder  (1mk)

(b) Name one gas that escapes from the chamber containing magnesium powder. Give a reason for your answer. (1mk)

When a hydrocarbon fuel burns, one of the main products is acidic gas R

(a) Identify gas R  (1mk)

(b) What two effects does gas R have when its concentration in the atmosphere exceeds its acceptable level.  (2mks)

When butan – 1 – 0L is oxidized by acidic potassium dichromate, a weak organic acid is formed. Draw and name the structure formula of the acid obtained from the above reaction. (2mks)

   The table below gives some properties of compounds P, Q, R and S

(a) Which one of the compounds in the table is ionic? Explain (1mk)

(b) Give the compound that is liquid at room temperature. (1mk)

Explain the following observations: very little carbon (iv) oxide is evolved when lead carbonate reacts with dilute hydrochloric acid (2mks)