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Elements, compounds and mixtures
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Elements, compounds and mixtures

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  • 1. Made by: M. Fahd-Un-Nabi Khan USMAN PUBLIC SCHOOL XI-O
  • 2. Elements An element is a substance which cannot be split into two or more substances by chemical means The smallest possible particle of an Element that can take part in a chemical change is called an ATOM.
  • 3. Compounds containing 2 or more Compound is substance elements chemically joined together. e.g. Magnesium is an element; oxygen is an element – they can only be combusted to form magnesium oxide (MgO) compound. Ions or molecules make up compounds Ions are atoms having electrical charge, e.g. NaCl made up of 2 ions; positively charged Na, negatively charged Cl.
  • 4. Molecules Molecule is group of two or more atoms chemically joined together, e.g. chlorine molecule has 2 chlorine atoms. Molecules can be either ELEMENTS or COMPOUNDS. E.g. MgO is a compound, but Cl2 is an element
  • 5. Mixtures 2 or more substances which are not chemically joined t ogether e.g. Iron in Sulphur powder. Can consist of:  Elements (Iron & Sulphur powder)  Compounds (Salt in water - salt & water are both compounds)  Elements + Compounds (Air; N2, O2, H2O)
  • 6. Difference between Compounds and Mixtures MIXTURE COMPOUNDS  Constituent substances can  Constituent substances can be separated easily by be separated only by chemical physical means means  Its physical and chemical  Its physical and chemical properties are an average of properties are individual and substances in it not the result of its elements  A mixture’s proportion can  A compound’s proportion vary cannot vary  Little or no energy is involved  Energy is usually involved when Mixture is formed when a Compound is formed
  • 7. Diffrentiation between Pure andMixtures  Pure Substances (elements, compounds) 1) Fixed composition 2) Fixed Mp/Bp 3) Produces only 1 spot on chromatogram 4) All molecules same (equal)  Mixture 1) Variable Composition 2) Variable Bp/Mp 3) 2 or more spots on Chromatogram 4) 2 or more different molecules

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