Elements, Compounds and Mixtures

An element is a substance that cannot be split up into simpler substances by chemical means

All known elements are listed on the periodic table of elements

An element is a substance that cannot be split up into simpler substances by chemical means 

All known elements are listed on the periodic table of elements

MOST COMMON ELEMENTSCopper-     Cu           Carbon-      CZinc-         Zn           Oxygen-     OAluminium-Al            Sulfur-       SIron-          Fe           Hydrogen-  HSilver-       Ag           Nitrogen-    NGold-         Au         

A compound is a substance that is made up of two or more different elements combined together chemically

Examples of compounds include:Water- Hydrogen and OxygenSalt- Sodium and ChlorineSand- Silicon and Oxygen 

A mixture consists of two or more different substances mingled with each other but not chemically combined

Examples of mixtures include:Air- Oxygen and other gasesSea water- Water and saltEarth- Stones, sand, clay

Differences between mixtures and compounds: Amounts of substances in a mixture can vary Mixtures contain two or more separate substances. Mixtures have similar properties to the substances in the mixture Substances in the mixture can be easily separated. Little energy changes occur when a mixture is made

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