B: iodine
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Which pair of elements, when combined together, do not form a covalent compound?
The diagram shows the structure of a covalent compound containing the element hydrogen, H, and the unknown elements X…
A metal consists of a lattice of positive ions in a 'sea of electrons'. What changes, if any, take place to the elect…
A drop of liquid bromine is placed in the bottom of a gas jar. Brown fumes of bromine vapour slowly spread through th…
The diagrams show an experiment with aqueous ammonium chloride. A gas, Y, is produced and the litmus paper changes co…
What is the mass of oxygen contained in 72 g of pure water? [Relative atomic masses: H = 1; O = 16]