His maths has always been pretty average, and he has always had very little confidence in his mathematical abilities. Jeevan’s programme is excellent. The break down of all mathematical problems has completely changed the way my son approaches his work and he is no longer doubting his ability....
(2) (ii) Air has an average density of 1.25 g dm–3. If the U-tube used in 23(d) is inverted, as shown in the diagram, the solid yellow iodine trichloride produced in the equilibrium reaction turns to a brown liquid. iodine ...