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amp;gt;amp;gt; host: Welcome back to amp;quot;Chemistry Mattersamp;quot; and our unit on chemical reactions. So far in this unit, weamp;#39;ve been studying chemical reactivity, and now weamp;#39;re going to use that information to identify these four white powder samples, using several different laboratory tests. Now, these powders may all look the same, but theyamp;#39;re all different chemicals. Letamp;#39;s see if our students can figure out how to tell them apart. amp;gt;amp;gt; professor: In front of you are the four samples. You also have a solubility table and a stack of index cards. And on the index cards, Iamp;#39;ve written a different chemical test that you can use to learn about each unknown. The unknown powder samples are lead(II) nitrate, potassium iodide, calcium carbonate, and sodium carbonate. Your first goal is to identify which one is which. Your second goal is going to be identify the unknowns in as few steps as possible. So Iamp;#39;d like you to wo