NCSU CH 101 - Chemisty Chapter 1 Notes (6 pages)

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Chemisty Chapter 1 Notes



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Chemisty Chapter 1 Notes

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Pages:
6
School:
North Carolina State University
Course:
Ch 101 - Chemistry - a Molecular Science

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Chemisty Chapter 1 Notes I Scientific method Steps of The Method 1 2 3 4 Observation Formulation of Hypothesis Prediction Testing Law vs Theory o Law Summarizes many observations o Theory Provides an explaination for laws cannot be proven Molecular Perspective o Chemists are interested in the dtructure of matter at the particulate level o Matter is the physical materials found in our environment consists of atoms and molecules II Birth of Modern Chemistry Lavoisier Debunks Phlogistron Theory o Phlogiston Theory Originally it was believed materials that burn contain phlogiston and burning it left a residue o Lavoisier realized this was false when he discovered the Law of Conservation Mass o Lavoisier is considered Father of Modern Chemistry Founder of Law of Conservation First to classify elements and compounds Element vs Compound o Element Pure substance unbreakable o Compound Pure substance that can be broken into small subunits Law of Conservation of Mass o Mass is never created or destroyed Law of Definite Proportions o Elements in a compound are always in a constant porportion Law of Multiple Proportions o When two elements can combine and make multiple compounds the ratios are represented by two whole numbers III Atomic Theory John Dalton 1804 o Discovered that elements are composed of atoms Found that they are unchangeable and never dissappear o Molecules refer to either elements of compounds Atoms can combine to form compounds Mass is very important it s the cornerstone of modern chemistry IV Atoms Molecules Joespeh Gay Lussac 1808 o Discovered the Law of Combining Values Volumes of reaction gases are in simple whole number ratios Law of Combining Volumes o H2O experiment He found that 2H 1O H2O Amadeo Avagadro 1811 o Avagadro s Law Equal columes of gas at controlled pressure and temp contain an equal number of molecules Figured out that even though oxygen is an element it is mostly availible as O2 because it is diatomic The Diatomic Elements o Atoms that are



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