Summer 2007 Ch 1

Summer 2007 Ch 1 - Chapter 1 Keys to the Study of Chemistry...

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Keys to the Study of Chemistry Chapter 1
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Is the study of matter, its properties, the changes that matter undergoes, and the energy associated with these changes.
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Definitions Chemical Properties those which the substance shows as it interacts with, or transforms into, other substances flammability, corrosiveness Matter anything that has mass and volume Composition the types and amounts of simpler substances that make up a sample of matter Properties the characteristics that give each substance a unique identity Physical Properties those which the substance shows by itself without interacting with another substance such color, melting point, boiling point, density
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A Physical change B Chemical change The distinction between physical and chemical change.
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The physical states of matter. Shape Volume Definite Volume
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Sample Problem 1.1 Distinguishing Between Physical and Chemical Change PROBLEM: Decide whether each of the following process is primarily a physical or a chemical change, and explain briefly: (a) Purple iodine vapor appears when solid iodine is warmed. (b) Gasoline fumes are ignited by a spark in an automobile engine cylinder. (c) A scab forms over an open cut.
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energy due to the position of the object or energy from a chemical reaction Potential Energy Kinetic Energy energy due to the motion of the object Energy Energy is the capacity to do work. Potential and kinetic energy can be interconverted.
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Energy Energy is the capacity to do work. less stable
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Summer 2007 Ch 1 - Chapter 1 Keys to the Study of Chemistry...

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