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Chapter 9 Compounds Lesson 1 Notes. Vocabulary Combining Elements  Elements join together to create compounds.  Compounds usually have different properties.

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Presentation on theme: "Chapter 9 Compounds Lesson 1 Notes. Vocabulary Combining Elements  Elements join together to create compounds.  Compounds usually have different properties."— Presentation transcript:

1 Chapter 9 Compounds Lesson 1 Notes

2 Vocabulary

3 Combining Elements  Elements join together to create compounds.  Compounds usually have different properties from the elements that make them up. For example:  Water is created by chemically joining two gasses. H H O H O H Gas Liquid +

4 Many Compounds  Are found in nature  Others are created in a laboratory  Some compounds are made up of just two compounds and others are made up of several.  For example:  CO 2 = Carbon (C) and Oxygen (O)  CaCO 3 = Calcium (Ca), Carbon (C), and Oxygen (O)

5 Making and Breaking Compounds  To form or break a compound, a chemical REACTION must occur.  This will only happen if energy is added (most commonly in the form of heat).

6 How to Read a Chemical Formula  Each capital letter in a formula represents an element on the periodic table. H 2 O NaCl  The subset number tells you how many atoms of that element are in each molecule H 2 O HydrogenOxygen Sodium Chloride Two hydrogen

7 Let’s Practice What You Know!  Let’s look that the chemical formula Fe 2 O 3  How many atoms of Iron are there? Oxygen?  Write the chemical formula for the molecule you see here:  What do you know about the chemical formula for sodium bicarbonate NaHCO 3 ?  Think…Do I know the elements, number of each, number of total atoms…. H O H

8 Everyday Compounds  Water is Earth’s most abundant element.  The earth is made up of 75% water  Your body is 66% water  You use compounds everyday. Here are some everyday compounds: Everyday Compounds


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