2_2_what_is_matter_LLZ_Revised.pptx - CHAPTER 2 SCIENCE...

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CHAPTER 2: SCIENCE, MATTER, ENERGY, AND SYSTEMS Lesson 2.2: What is Matter?
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WHAT IS MATTER? Learning objectives: Define matter and identify its building blocks Distinguish between physical and chemical changes Describe the law of conservation of matter
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MATTER CONSISTS OF ELEMENTS AND COMPOUNDS Matter is anything that has mass and takes up space. All matter exists in one of three physical states depending on temperature and pressure: Solid Liquid Gas Chemically , matter can be an element (made entirely of the same atoms) or a c ompound (combinations of more than one type of atom)
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ELEMENTS : FIRST BUILDING BLOCK OF MATTER An element is a type of matter with a unique set of properties that cannot be broken down into simpler substances by chemical means. Each element has a unique symbol. Elements are arranged in the Periodic Table of Elements according to their chemical behavior. There are currently 118 known elements on the Periodic Table of Elements
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Rows are called periods Columns are called groups Periodic Table of the Elements Created by Dmitri Mendeleev in 1869
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COMPOUNDS Most matter consists of compounds Compounds are combinations of two or more different elements held together in fixed proportions. Water is a compound consisting of two elements: Hydrogen (H) and Oxygen (O)
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ATOM: BASIC BUILDING BLOCK OF MATTER An atom is the smallest unit of matter into which an element can be divided and still have its distinctive chemical properties. Molecules are made up of atoms. Dust, air, water, people— everything is made of atoms.
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