University:
Thomas Jefferson University
Course:
CHEM 103 | Chemistry I
Academic year:

2024
Views:

172

Pages:

1
Author:

Imani H.

11 Chemistry in Context Chemistry: the study of matter & the changes it undergoes Matter: anything that has mass & occupies space. Chemistry is called the central science b/c other sciences depend on it The scientifie method is the way scientist noestigate the world ascend them. Lo Thee steps LP Observe 4 form a hypothesis perform experiments 1.2 Phases & Classifications of Matter A is a form of matter with distinct properties and crariant Composition. Can exist as a solid, liquid, or gas Liquids & gases (fluids) conform to the shape of their container, Solids do not Groses assume the volume of their container. A physical Method does not involve a chemical reaction ex: distillation, filtration, Chromatography. A Chemical method involves a chemical reaction & Changes the substarre Ex: boiling, electrolysis. Physical & chemical Methods can be used to distinguish elements, compounds, and Mixtures experimentally. Can't be broken down into simpler substances. Compounds: can be broken down mio sevents wing cheascal but not physical Methods. Mixtures: can be separated into two or more substances using physical Methods. Homogeneous Mixtures have no boundary lines. Ex: sugar woler Heterogeneous mixtures have bandary lines. Ex: Oil & water 1.3 Physical & Chensical Properties A Can be doserved without changing the identity & Chemical composition of the sample. Ex: boiling point, height, color, texture, density. A Còn anly be pimered via a chemical rrachon which changes the subalance Ex: Flammabilite, sus caphbility to conosion. An extensive property depends of sample. Cr: Mass Evolume, length Intensive property does not depend on the quant. Ex: densityrteup Pressure 1.4 Measurements A A Measurement is expressed using a nosiber. Measurement is expressed without using a number Асель Altona convient way to express a very lange/small number Ex: A x10" where A is a number between 1-D if number is greater than I than n is positiven less than I than N is negative

1.1-1.4 Chemistry in Context

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