Jump to a New ChapterIntroduction to the SAT IIIntroduction to the SAT II Chemistry TestStrategies for Taking the SAT II Chemistry TestThe Structure of MatterThe States of MatterReaction TypesStoichiometryEquilibrium and Reaction RatesThermodynamicsDescriptive ChemistryLaboratoryBasic Measurement and Calculation ReviewChemical Formulas Review: Nomenclature and Formula WritingPractice Tests Are Your Best Friends
 5.1 Intra- and Intermolecular Forces 5.2 Solids 5.3 Liquids 5.4 Gases 5.5 Phase Changes 5.6 The Gas Laws 5.7 Boyle’s Law 5.8 Charles’s Law

 5.9 Avogadro’s Law 5.10 The Ideal Gas Law 5.11 Density of Gases 5.12 Dalton’s Law of Partial Pressures 5.13 Graham’s Law of Diffusion and Effusion 5.14 Solutions 5.15 Practice Questions 5.16 Explanations
Boyle’s Law
This is the first of the five-odd gas laws you’ll need to know for the SAT II Chemistry test. Study these laws closely because you are sure to see a question or two that asks you to apply them.
Boyle’s law simply states that the volume of a confined gas at a fixed temperature is inversely proportional to the pressure exerted on the gas. This can also be expressed as PV = a constant. This makes sense if you think of a balloon. When the pressure around a balloon increases, the volume of the balloon decreases, and likewise, when you decrease the pressure around a balloon, its volume will increase.
Boyle’s law to can also be expressed in the following way, and this is the form of the law that you should memorize:
P1V1 = P2V2
Example
Sulfur dioxide (SO2) gas is a component of car exhaust and power plant discharge, and it plays a major role in the formation of acid rain. Consider a 3.0 L sample of gaseous SO2 at a pressure of 1.0 atm. If the pressure is changed to 1.5 atm at a constant temperature, what will be the new volume of the gas?
Explanation
If P1V1 = P2V2, then (1.0 atm) (3.0 L) = (1.5 atm) (V2), so V2 = 2.0 L. This answer makes sense according to Boyle’s law—as the pressure of the system increases, the volume should decrease.
 Jump to a New ChapterIntroduction to the SAT IIIntroduction to the SAT II Chemistry TestStrategies for Taking the SAT II Chemistry TestThe Structure of MatterThe States of MatterReaction TypesStoichiometryEquilibrium and Reaction RatesThermodynamicsDescriptive ChemistryLaboratoryBasic Measurement and Calculation ReviewChemical Formulas Review: Nomenclature and Formula WritingPractice Tests Are Your Best Friends
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