Chap1 - Chem 200 Dr. Saidane Lecture Notes Chap 1, Part 1...

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Chem 200 Dr. Saidane Lecture Notes Chap 1, Part 1 Matter and Changes Chemistry is the study of matter and the changes it can undergo. Chemistry deals with questions such as: 1. What is that material made of? 2. What is its makeup and internal arrangement? 3. How does it behave and change when heated, cooled, or mixed with other materials? 4. Why does this behavior occur? Matter is anything that has mass and takes up space. Matter appears in a huge variety of forms. It includes anything we can touch or see as well as anything we cannot touch or see. Therefore the knowledge of chemistry is essential if we want to understand how the world works. Matter is made of atoms, elements, and compounds. It has different states, properties and undergoes changes. Building Blocks of Matter : 1. An atom is the building block of matter. It is the smallest unit of an element that maintains the properties of that element. 2. An ion is a positively or negatively charged atom or group of atoms. 3. An element is a pure substance made of only one kind of atom. 4. A compound is a substance that is made from the atoms of two or more elements that are chemically bonded. They are classified as either molecular compounds or ionic compounds. 5. A molecule or a molecular compound is a definite and distinct electrically neutral group of bonded atoms. 6. An ionic compound is a definite and distinct electrically neutral group of bonded ions. 1
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i. States of Matter Matter can be gas, liquid, or solid. 1. Matter in the gas state has neither definite volume nor definite shape. It takes the volume and shape of container. The particles are far apart from each other and move in strait lines freely, randomly and rapidly inside the container. 2. Matter in the liquid state has a distinct volume independent of the container. It has no specific shape. The particles are close to each other. They move around but not as fast as in the gas state. 3. Matter in a solid state has definite volume and definite shape. The particles are packed in a definite, ordered arrangement. They can only rotate and vibrate in a fixed position. Properties of Matter
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This note was uploaded on 09/09/2011 for the course CHEM 200 taught by Professor Saidane during the Spring '11 term at Mesa CC.

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Chap1 - Chem 200 Dr. Saidane Lecture Notes Chap 1, Part 1...

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