because they have a pH level less then 7
This substance is called a pH indicator.
Acid is not any single substance but a "family of substances. There are many different acids. Some are solids, some are liquids, some are gasses.
A substance can react with acids by donating protons or forming new compounds through chemical reactions. The reaction can result in the substance being broken down or forming a new product depending on the nature of the substance and the acid involved.
a peptide
These are the acids.
Amino acids
Molecules of salts, acids, hydroxides.
Acid is neutralized by Bases (or Basic Substances.)
Gold is a substance that is not attacked by most corrosive acids, making it a popular choice for jewelry and other applications where resistance to corrosion is desired.
Acids break down substances faster based on their chemical reactivity with the particular substance. Acids donate protons to substances, leading to chemical reactions that may break down the substance's molecular structure. The strength and concentration of the acid, as well as the composition of the substance being acted upon, influence the rate of breakdown.
Protiens
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