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Week 1 of Chemistry 1 Notes

by: Brielle Zangari

Week 1 of Chemistry 1 Notes 23459

Marketplace > Rowan University > Science > 23459 > Week 1 of Chemistry 1 Notes
Brielle Zangari
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This set of notes covers the definitions for components of matter, law of mass conservation, law of multiple properties, and Dalton's atomic theory.
Chemistry 1
Class Notes
Chemistry I
25 ?




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This 2 page Class Notes was uploaded by Brielle Zangari on Saturday January 23, 2016. The Class Notes belongs to 23459 at Rowan University taught by Dong in Winter 2016. Since its upload, it has received 19 views. For similar materials see Chemistry 1 in Science at Rowan University.


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Date Created: 01/23/16
Week 1 of Chemistry 1 Notes Definitions for Components of Matter  Elements: simplest type of substance with unique physical and chemical properties. An element consists of only one type of atom. Example: Water  H O  Molecule: structure that consists of two or more atoms that are chemically bound together and thus behaves as an independent unit.  Compound: substance composed of two or more elements that are chemically combined. Example: NaHCO 3  if you put it in water, it will dissolve into Na+ and HCO 3 QUESTION: Why is this a compound and NOT a molecule? ANSWER: A molecule is form when two more atoms are chemically joined together. A compound is a molecule that has at least two different kinds of elements. All compounds are molecules, but not all molecules are compounds.  Mixture: group of two or more elements and/or compounds that are physically intermingled. Law of Mass Conservation Total mass of substances present does not change during a chemical reaction. Reactant 1 + Reactant 2    Product Total Mass = Total Mass Examples: Calcium Oxide + Carbon Dioxide  CaCO 3 CaO + CO 2 CaCO 3 56.08g + 44.00g  100.08g Calculating the mass of an element in a compound.. Use the ratio to find the answer this the practice problem: 84.2g of Uranium, composed of 71.4g of Uranium with O as the only other element. How many grams of Uranium can be obtained from 102kg of pitchblende? 84.2g 71.4g 71.4g/84.2g x 100% = 84.7% Mass (kg) pitchblende x mass uranium in pitchblende/mass pitchblende = 102kg pitchblende x 71.4 kg Uranium/84.2kg pitchblende = 86.5kg Uranium = 86.5kg Uranium x 1000g/1kg = 8.65 x 10^4g Uranium Law of Multiple Properties If element A and B react to form two compounds, the different masses of B that combine with a fixed mass of A can be expressed as a ratio of small whole numbers. Example: Carbon Oxides A and B Carbon Oxide I: 57.1% O and 42.9% C Carbon Oxide II: 72.7% O and 27.3% C Dalton’s Atomic Theory Dalton postulated that: 1. All Matter consists of atoms; particles of an element that cannot be created/destroyed. 2. Atoms of one element cannot be converted into atoms of another element. 3. Atoms of an element are identical in mass and other properties and are different from the atoms of any other element. 4. Compounds result from the chemical combination of a specific ratio of atoms of different element.


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