Here is a link that will give you several definitions and examples of alloys. Although none use the word concentration, I think the one that explains steels (the word percentages is used) might be something you could use with the words "different concentrations" substituted for "percentage".
Oops, forgot the link.
http://www.google.com/search?q=define%3Aalloy&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
What is a way to put alloy and concentration into a sentence that helps to explain solutions?
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