Arectangular steel block of diamension of 10cm×5cm×2cm jas a mass 550g. calculate the density of the block

Outermost (valence) electrons

The reaction will shift to the right

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It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).