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Chemical Equations
Reactants are written on the left side separated by + signs. Products are written on the right, also separated by + signs. ' D ' (the greek capital letter delta) placed over or below the arrow means that heat was added to the reactants. (g) means that the substance is gaseous. (l) means t..
Internal Energy
Every substance possesses a definite quantity of energy, under a given set of factors such as chemical nature of the substance, temperature and pressure. The total energy contained in a system or substance is called its internal energy or intrinsic energy. It is represented by the symbol..
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