The Chemical Earth

The living and non-living components of the Earth contain Mixtures

  1. Identify the difference between elements, compounds and mixtures in terms of particle theory

Element: An element is a pure substance that contains only one type of atom. It cannot be decomposed by ordinary chemical or physical means. e.g. Carbon, Oxygen, Nitrogen, Hydrogen

Compound: A compound is a pure substance that consists of two or more atoms chemically combined in a fixed ratio. They can only be decomposed by chemical means. e.g. H2O, CO2, NaCl

Mixture: A mixture is a physical blend of two or more pure substances in a variable proportion. Mixtures are not chemically bonded and can be separated by physical means. There are two type of mixtures: Homogenous and Heterogenous

Homogenous Mixture: The mixture has a uniform composition and properties throughout e.g. Salt water

Heterogenous Mixture: The mixture has variable properties and composition throughout. E.g. sand and water, concrete

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The Chemical Earth Diagram