A recipe calls for 175 grams of flower. The density of flower is 0.620g/mL. How many mL of flower is needed

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).

Aquantity of that isotope to decay to 1/2 of  its original value

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