Search and browse 1000’s of questions from past papers and view answers.
In an experiment to measure the dissolved oxygen content of a river water sample, a small amount of a concentrated solution of compound A, followed by a small amount of a concentrated solution of alkaline potassium iodide (KOH/KI), were added to a bottle
(2013)
In a practical examination, chemistry students were required to perform a number of tasks in a laboratory. They had access to all the necessary reagents and glassware and also to the required safety equipment and clothing
A reaction vessel of negligible heat capacity held 75 cm3 of 1.0 M HCl solution at a temperature of 13.0 C
Write the electron configuration (s, p, etc.) of a zinc atom in its ground state.
The 350th anniversary of Robert Boyle’s discovery of the relationship between the pressure and the volume of a fixed mass of gas at constant temperature is commemorated in this Irish stamp issued in 2012.
