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Combination of elements to form compounds

Explore how a finite number of elements combine in endless ways to create compounds, which are vital in both living and non-living matter. Learn about the properties of compounds, including acids, bases, and salts, through engaging examples like sodium chloride (table salt), formed from sodium and chlorine. Each compound has distinct characteristics, different from the elements that compose it. Students will identify and classify these compounds, understanding their chemical nature through hands-on activities and comparisons.

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Combination of elements to form compounds

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  1. Combination of elements to form compounds • Benchmark SC.8.P.8.5Recognize that there are a finite number of elements and that their atoms combine in a multitude of ways to produce compounds that make up all of the living and non-living things that we encounter • SC.8.P.8.8Identify basic examples of and compare/classify the properties of compounds, including acids, bases, and salts.

  2. Bellringer: 3 minutes!

  3. A compound is a substance which is made up of two or more elements that have been chemically combinedtogether. Elements chemically combined? What do you mean? Compounds

  4. Compounds Sodium- is a soft silvery white metal that reacts violently with water Chlorine-is a poisonous, greenish yellow gas. + Put the two together = sodium chloride!! Table Salt, a perfectly safe, edible compound NaCl Table salt is made out Sodium and Chlorine. Cannot be separated by physical means! It is different to Sodium and different to Chlorine! Sodium chloride (table salt)

  5. Let’s check! A compound… • Is a substance which is made up of two or more elements that have been chemically combined. • Can bebroken down into a simpler type of matter (elements) by chemical means (but not by physical means). • Has properties that are different from its component elements. Ex: In a water molecule Hydrogen and Oxygen are gases but when they combine together they form a liquid. • Always contains the same ratioof its component atoms. Ex: In a water molecule there are 2 Hydrogen atoms per every Oxygen atom (H2O). And in a peroxide molecule there are 2 Hydrogen atoms per every 2 Oxygen atoms.

  6. Cu O O O A compound is a substance which is made up of two or more elements that have been chemically combinedtogether. H H H H H H Is this a compound? Is this a compound? Is this a compound? Is this a compound? O H O It only contains one type of element. It only contains one type of element. It is not chemically combined. H H H H O What is a compound? Yes! Why not? Why not? Why not?

  7. Examples of compounds • ACIDS • taste sour • and turn blue litmus paper red. • BASES • feels slippery • and turns blue litmus paper darker blue.

  8. Acids and Bases

  9. Hands on time!

  10. Challenge Time Answer the 5 FCAT like questions on your own!

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