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When the atom is neutral and the number of electrons and the number of protons are equal. </span></span></span></span>
<em>Hard </em><em>water </em><em>is </em><em>mostly </em><em>used </em><em>in </em><em>Industries </em>
It is both.
<span>It is a physical change because when you chew your food you break it up into smaller pieces and are therefore changing its size and shape which are physical changes. </span>
<span>However, digestion begins in the mouth. When we chew our food, it mixes with enzymes from our saliva and begins to break down the food. Digestion is a chemical change.</span>
Here's li
nk to the asnwer:
bit.ly/2X07dra
