I've seen people kiss an aron kodesh (cabinet holding Torah scrolls) when they approach it and, if they were standing near it, before they leave it. Does this have any written source; or, are there known instances of authoritative individuals' having done (or advised) thus?
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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions
Apparently the of last four, $\ce{Mg^2+}$ is closest in radius to $\ce{Li+}$. Is this true, and if so, why would a whole larger shell ($\ce{...
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It is a well known fact that freezing point decreases on adding impurities. I feel that it should increase on adding impurities. Reason: I h...
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I am a confused (and somewhat anal retentive) non-chemist who is trying to understand what pH is. I have come to understand it is a measure ...
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