An impurity in petroleum is dimethylsulphide, CH 3SCH3. When dimethylsulphide is burnt in an excess of air, which one of the following balanced equations represents the reaction that takes place?…
A sample of an alkali XOH of mass 2.8 g was dissolved in water. This solution was neutralised by 12.5 cm3 of sulphuric acid of concentration 2.0 mol dm-3.2 XOH…
Cyclohexene, C6H10, is drawn as: Apply this information for the steroid-type structure shown below to find the total number of carbon atoms in the molecule. Answer: 26) B The first…
a is inversely proportional to the square of b.When a = 9 , b = 4.What is the positive value of b when a = 4 ? Answer: 26) A…
Which of the following thermal decomposition reactions will require the highest temperature? Answer: 26) D This requires to remember the reactivity series off by heart as such question do often…
The list below describes some events that occur during nuclear division. Indicate, by shading the appropriate circles on the answer sheet, which events occur during mitosis and which occur during…
The bar charts X and Y show the concentration of five substances in the blood before andafter passing through two organs. What are the organs X and Y through which…