Homework Help: chemistry

Posted by Rebecca on Tuesday, January 13, 2009 at 4:45pm.

1.How would you separate a mixture of salt, sawdust, and iron filings?

2. The Mg^2+ and Na^+ ions have ten electrons. Which has the smaller radius? Explain.

chemistry - Ms. Sue, Tuesday, January 13, 2009 at 5:04pm
From my high school chemistry class almost 60 years ago --
Use a magnet to pull out the iron filings. Water will dissolve the salt. The sawdust will remain.
chemistry - DrBob222, Tuesday, January 13, 2009 at 6:29pm
Ms. Sue remembers her chemistry from 60 years ago. Yea!

For #2,consider the charge on the Na nucleus versus the charge on the Mg nucleus.

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