It is called rust and it forms when water soaks into the metal forming a chemical reaction.
A because if you multiple it, you will be moving the decimal one time
Answer:
if a mixture of a given percentage or ratio strength is diluted to twice its original quantity, its active ingredient will be contained in twice as many parts of the whole, and its strength therefore will be reduced by one-half
Physical<span> changes involve a new </span>form<span> or shape of matter,
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Chemical change<span> is any </span>change<span> that results in the formation of new </span>chemical<span> substances.</span>
