Elements, Mixtures & Compounds

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Presentation transcript:

Elements, Mixtures & Compounds

Where are all elements listed? The periodic table What is an element? An element is a substance that cannot be split into simpler substances by chemical means. Examples? Hydrogen (H), Magnesium (Mg), Oxygen (O)

What is a compound? A compound is formed when two or more elements chemically combine. Examples: H + O H20 Hydrogen + Oxygen Water Fe + S FeS Iron + Sulfur Iron Sulfide

What is a mixture? A mixture is formed when two or more elements are mixed together but not chemically combined. Examples: Sand & water Mixture of iron and sulfur

Metals and Non-Metals Non-Metals Metals

Examples of Metals: Iron (Fe) State: Solid Colour: Grey Magnesium (Mg) State: Solid Colour: Grey

Non – Metals Oxygen (O) State: Gas Colour: Colourless Carbon (C) State: Solid Colour: Black

When elements take part in a chemical reaction, sometimes they lose their individual properties. Example: Hydrogen + Oxygen Water (Gas) (Gas) (Liquid)

Carbon + Oxygen Carbon Dioxide (Black solid) (Gas) (Colourless Gas) Magnesium + Oxygen Magnesium Oxide (Metal) (Gas) (White powder)

Iron + Sulfur Iron sulfide (Metal) (Yellow powder) (Black solid) Mixture – Iron & Sulfur Chemical reaction Compound – Iron Sulfide