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For an EXothermic reaction energy EXits the reaction meaning that there is more energy at the start than there is at the end. In a reaction profile this is shown by a drop of energy from the reactants to ...

Using the formula mass=Mr * moles we can rearrange this so it equals moles= mass / Mr. We are told the mass of the NaCl is 50g however we need to work out the Mr (relative formula mass) of the NaCl too. W...

Graphene is a giant covalent compound made purely of carbon atoms. Within graphene each carbon atom is covalently bound to just 3 other carbon atoms. A carbon atom usually makes 4 covalent bonds. This mea...

Diamond – The electrons are tightly bound between the atoms. Bonds are difficult to break as they are held firmly together hence diamond has a hard structure. Diamond does not have free electrons to carry...

Ethanoic acid is CH₃COOH. Acids can ionise, producing H⁺ ions and in this case, CH₃COO (ethanoate) ions. The sodium exists as Na⁺ ions in solutio...