Write equations for cracking reactions.

In the subtopic Fractional distillation and cracking, this AQA A-Level Chemistry 7405 learning objective focuses on write equations for cracking reactions. It belongs to Alkanes, so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include cracking. Cracking. means a thermal or catalytic process that breaks large hydrocarbon molecules into smaller ones, typically producing alkenes and smaller alkanes Avoid the mistake of students often write the cracking equation without balancing the number of atoms on both sides, leading to incorrect stoichiometry; instead, to fix this, ensure that the number of each type of atom is the same on both sides of the equation. For example, when cracking hexane (C6H14) into ethene (C2H4) and butane (C4H10), write the balanced equation: C6H14 → C2H4 + C4H10. Check that there are 6 carbons and 14 hydrogens on both sides For exam answers, when writing equations for cracking reactions, remember to balance the equation by ensuring the number of atoms for each element is the same on both sides