lecture 2 - Mass Balance Mass Balance Chemistry is the...

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Mass Balance
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Chemistry  is the science of matter, especially its  properties, structure, composition, behavior,  reactions, interactions and the changes it  undergoes, i.e the transformation of matter. Mass Balance
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To study chemistry, our primary focus will be on  matter. Why? Matter is the physical material of the universe. It is anything that occupies space and has mass. Chemistry is the science that is primarily  concerned with matter and the changes it  undergoes. Matter
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Understanding change is tied to understanding the  nature and composition of matter. Change is the only permanent thing about our  world, examples; trees change in colour, iron  rusts, snow melts, paint peels, seeds become  flowers and wood burns, we grow up. Living things  undergo continual change. Even dead material  change as they decay. Matter
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We cannot understand change without knowing  the structure of the things that change. The proper application of the knowledge of  structure is understanding chemical  transformation. This is the area of chemical  dynamics. Matter
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It is the basis for understanding many of the  quantitative relationships that exist between  substances undergoing chemical changes. It is a very simple statement yet a very significant  law Atoms are neither created nor destroyed during a  chemical reaction” The law of conservation of  mass
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The total mass of all the substances during a  chemical reaction is the same as the total mass  before the reaction.  They merely exchange partners or become  rearranged. E.G Immediate qualitative application of this law: 1-Our  attempts to conserve our natural resources and  minimize pollution. The law of conservation of  mass
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We remove our wastes and throw them in lakes  and oceans. The law of conservation of mass  reminds us that we really haven’t been throwing  anything away, it is diluted and spread through the  lakes and oceans or being transformed through a  chemical reaction, but never got rid of. 2-Combustion of coal; coal is transformed to carbon  dioxide and spread into the atmosphere, carbon  atoms are diluted and incorporated into the very  stable carbon dioxide molecule. The law of conservation of  mass
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How do scientists represent a chemical reaction?  It is represented through a chemical equation. E.g. the combustion of coal, the reaction of  Carbon with the Oxygen in air to form carbon  dioxide C+O2                  CO2 C and O are the reactants CO2 is the product + means  reacts with                   means produces.
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