chemical change or physical change?

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From: Andrew Libson (andrewlibson@yahoo.com)
Date: Mon Sep 29 2003 - 13:32:03 PDT 

Message-ID: <20030929203203.66631.qmail@web40909.mail.yahoo.com>
Date: Mon, 29 Sep 2003 13:32:03 -0700 (PDT)
From: Andrew Libson <andrewlibson@yahoo.com>
Subject: chemical change or physical change?

2 questions...

Are these process chemcal changes or physical changes.

1) concrete solidifying. I would guess chemical.

2) dissolving an ionic compound NaCl => Na+ T Cl-

I would guess physical..but I am not sure.

DOes anyone know?

Thanks...

Andy.

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