Jis a colourless solid. When it is warmed with sodium hydroxide solution it produces a gas, K, which turns damp universal indicator paper blue. When
nitric acid, followed by silver nitrate solution, is added to a solution of J, a
cream precipitate of L is formed.
a State the names of J, K and L.
Write an ionic equation for the formation of the cream precipitate.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.