How can elements be classified?

​Learning Objectives:

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·To classify elements and compounds.

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SUCCESS CRITERIA:

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qI can classify elements and compounds in different categories by their properties.

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​Discuss with your Peer the difference between atoms, elements, and compounds.

​How can elements be classified?

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Elements are classified into three types.

1. Metals

2. nonmetals

3. metalloids.

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•The periodic table is a tool used to classify and identify elements that have similar properties.

​How can compounds be classified?

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•Compounds can be classified as

1. acidic

2. basic

3. neutral by measuring pH.

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​Pure water has a pH of 7

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Acids have a pH below 7.

Bases have a pH above 7.

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•Blue litmus paper turns red in the presence of an acid.

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•Red litmus paper turns blue in the presence of a base

​Compounds can be organic or inorganic.

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Organic compounds are those that contain carbon and hydrogen.

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Organic compounds made by living things are called biochemicals.

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Carbohydrates, lipids, proteins, and nucleic acids are biochemical compounds.

​What are mixtures?

A mixture is a combination of two or more substances that are combined physically but not chemically.