elements compound homogeneous heterogeneous · 1 classifying matter matter classification matter...

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Classifying Matter

Matter ClassificationMatter

Pure Substances Mixtures

Elements Compound Homogeneous Heterogeneous

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Pure Substances• A substance that contains only one type of particle.• A sample of gold contains only gold particles. • A sample of water contains only water particles.

Elements• Substances that cannot be broken down into simpler substances by a chemical reaction.• Each element consists of a different atom.• You can identify elements by their chemical symbol, found on the Periodic Table.• Examples of elements: • Aluminum (Al) ­ solid• Mercury (Hg) ­ liquid• Helium (He) ­ gas

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Compounds• Substances that contain two or more elements joined together by a chemical reaction. • A compound consists of the same molecules.• You can identify compounds by their chemical formula. • H2O – Water C6H12O6 – Glucose (Sugar).

• A substance that consists of two or more types of particles.

Mixtures

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Heterogeneous Mixtures• A mixture that consists of two or more substances; different particles are visible. • The mixture looks different throughout (heterogeneous = “different phases”).

Homogeneous Mixtures• A mixture that consists of two or more substances that are mixed very well that we cannot see the parts (but no formula). • The mixture looks the same throughout (homogeneous or “same phase”).

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Which of the following are pure substances?• Sand• Copper wire (Cu)• Your Phone• Your notebook

Which of the following is a mixture?• Pure water (H2O)• Pure gold ring (Au)• Iron rod (Fe)• River water

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Which of the following is not an element?• Gold (Au)• Sugar (C6H12O6)• Iron (Fe)• Zinc (Zn)

Which of the following is a compound?• H2O• Au• Cu• Fe• Zn