Which of the following is not true of alloys?
a. alloys are made of two or more metals combined physically.
b. the mixture of metals in an alloy is based upon the desired use.
c. alloys can be substitutional or interstitial.
d. an example of an alloy is copper.

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

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