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URI CHM 103 - Intro to Chemistry and Matter

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CHEM 103 1st Edition Lecture 1Outline of Last Lecture Outline of Current Lecture II. What is Chemistry?a. Definition of chemistryIII. Mattera.Definition of massb.Definition of weightIV. Properties of Mattera. Physical Propertiesb. Chemical PropertiesV. Changes of Mattera. Physical Changesb. Chemical ChangesCurrent LectureWhat is Chemistry?Chemistry is: - The study of the physical and compositional changes of matter- Called the Central Science. This is because chemistry borrows from physical sciences such as physics, while life sciences such as biology and health related areas of study use principles from chemistryMatterMatter is anything that has mass, occupies space, and is made of atoms or parts of atoms.Mass:- Measure of the amount of matter in an object- Independent of location – it is always the same no matter where the object is located. Ex: An apple’s mass would be the same on the moon as it is on earthWeight:These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Measure of the gravitational pull on an object- Weight can be explained by the equation for force, which is Force = Mass x Acceleration (F = ma). Because gravitational pull is a form of acceleration, gravity can replace acceleration in the equation. Thus, Weight (wt) = m x gravity- Ex: An apple’s weight would be lower on the moon than on the earth, because the moon’s gravitational pull is less than the earth’sProperties of MatterThere are two kinds of properties of matter that are observed in chemistry.Physical Properties:- Can be observed or measured without changing the composition of the matter being observed- Ex: color, shape, mass, state of matter (solid, liquid, gas), etc.Chemical Properties:- Can be observed or measured only when the composition of matter is changed- Ex: metabolism (respiration, the ripening of fruit), flammability, etc.Changes of MatterProperties of matter are often found as a result of changes of matter. Like properties, there are two kinds of changes of matter that are observed in chemistry.Physical Changes:- Are reversible- Take place without a change of composition- Nothing new is created- Ex: water melting (changing state from solid to liquid). Water is still H2O throughout this process.o Changes of state are physical, not chemical, because the molecular composition is still the same whether it is a gas, liquid, or solidChemical Changes:- Cannot be reversed- Changes the composition- New chemicals are created- Ex: Oxidization (an iron screw


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URI CHM 103 - Intro to Chemistry and Matter

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