Chapter 1 - Chapter 1: Introduction: Matter and Measurement...

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Chapter 1: Introduction: Matter and Measurement Chemical principles all over What chemistry is about dealing with some fundamental concepts of matter and scientific measurements hydrogen as a molecule s in cool regions, as atoms in hotter regions, and ions in hottest regions 1.1 The study of chemistry: What chemistry is about and why it is useful to learn chemistry THE ATOMIC AND MOLECULAR PERSPECTIVE OF CHEMISTRY Chemistry: involves the study of properties and behavior of matter o Matter is the physical material of the universe It is anything that has mass and occupies space o A property is any characteristic that allows us to classify types of matter from others o Elements are the composition Not all matter is common or familiar A tremendous variety of in our world is due to a combination of only 100 basic substances Relate properties to its composition (particular elements it contains) Atoms o The almost infinitesimally small building block of matter o Each element is composed of a unique kind of atom Properties of matter are related no only to composition but also to structure Molecules o Atoms combine to form them o 2 or more atoms are joined together in specific shapes Chemistry seeks to understand the properties and behavior of matter by studying the properties and behavior of atoms and molecules a. there are about 100 basic elements which compose much of the variety in the world b. Atoms are the submicroscopic particles that re the building blocks of matter WHY STUDY CHEMISTRY Understand positive and negative effects that chemicals have in our lives and be informed about their uses Chemistry is the central science to understand other sciences and technologies 1.2 Classifications of Matter: Fundamental ways to classify materials. Distinguish b/n pure and mixture substances. There are 2 different kinds of pure substances; elements and compounds. Classify matter o According to its physical state (gas, liquid, or solid) o According to its composition (as an element, compound, or mixture) States of matter o A gas Also known as a vapor Has no fixed volume or shape It conforms to the volume and shape of its container Can be compressed to occupy a smaller volume, or expanded to occupy a larger space o A liquid Has a fixed volume but has no fixed shape It assumes the shape of the portion of the container it occupies o A solid Has both a definite shape and a definite volume o Both solids and liquids can’t be compressed to any appreciable extend
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o Properties of the state at the molecular level In a gas Molecules are far apart and are moving at high speed. The collide repeatedly against each other and the walls of the container
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This note was uploaded on 09/21/2009 for the course CHEM 1A taught by Professor Mclendon during the Fall '08 term at Saddleback.

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Chapter 1 - Chapter 1: Introduction: Matter and Measurement...

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