Chemical Reactions

• During chemical reactions - Detectable energy change, no atoms created or destroyed, at least 1 new substance formed, no net change in mass
• Crystallisation - separates solutions into dissolved solids (solutes) and liquids (solvents).
• Simple distillation - separates two liquids with different boiling points
• Fractional distillation - used to separate a mixture of liquids with different boiling points
• law of conservation of mass: total mass of reactants = total mass of products