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Cracking is when large hydrocarbon molecules are broken down into smaller ones using a catalyst - one alkane and one alkene are formed.Alkanes are hydrocarbons with only single bonds.Alkenes have one double ...

Two or more elements or compounds that are not chemically combined together, wherein the chemical properties of each substance remains unchanged.

First look at the periodic table to find the atomic number - 14.Then if it is a stable atom with no valency, the electron number will be equal to the proton number - 14.To work out the number of neutrons, su...

The products are a salt and hydrogen, MgCl 2 and H 2 .The balanced equation is: Mg + 2 HCl -> MgCl 2 + H 2 This is a metal/acid reaction.Mg is a Group 2 metal, so there are two electrons in the outermost ...

The electron density in the phenol ring is higher than that of the benzene ring due to the presence of the OH group. This allows the electron substitution reaction to happen without a sulphuric acid catalyst.