Title EDX Topic 2 elements compounds mixtures.pdf ✅

Topic 2 1 Elements, Compounds & Mixtures
Topic 2 2 Element: it’s a substance made up of atoms with the same atomic number. It can’t be split up into anything simpler by chemical means Compound: It contains two or more elements joined together chemically. Mixture: It contains 2 or more different substances that are mixed together physically.

Separation of Mixtures Separation of Mixtures Separation of a mixture depends on the difference in physical properties of its components (solubility, density, particle size, boiling point, etc.) Types of Mixtures: 1.Mixture of solids 2.Mixture of liquids 3.Mixture of gases 4.Mixture of solid and liquid Solid Insoluble in Liquid Example: Separating a mixture of Sand & Water Pour the mixture over a filter paper placed on a funnel. Water passes through the filter paper & is filtered but sand remains on the filter paper. Filtrate: the liquid that’s filtered ‘water’ Residue: the solid that is left behind ‘sand’ This method of separation depends on difference in particles’ size. Water has small particles, so they pass through the pores in the filter paper while sand has large particles so they can’t pass through. Note! Example: Separating a mixture of salty water (aqueous Sodium Chloride) or aqueous Copper Sulfate mixture To get the solid by crystallisation, Heat the mixture till crystallisation point Leave the mixture to cool. Filter crystals Dry crystals between two filter papers Solid Soluble in Liquid 4