When the substance is creating gases. Sometimes when it’s bubbling up
The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and nitrogen (NOx). Acid rain usually forms high in the clouds where sulfur dioxide and nitrogen oxides react with water, oxygen, and oxidants. this mixture forms a mild solution of sulfuric acid and nitric acid
You add solute until it can't dissolve anymore.
The larger the piece the longer it will take to break down. This is because it has more mass that needs to be broken down.
Answer:
a negative charge
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