Now we're going to say here, generally, an acid is a covalent compound, meaning it's only connected to nonmetals, and it begins with a hydrogen ion called the hydronium ion. Common acids. We have HBr, HNO3, HCl, 4H2SO4, and H3PO4. These are some common types of acids. All of them are covalent. All of them begin with hydrogen.
Now how could it be? Chemistry? Without some exceptions, of course. So acetic acid is an exception. This form shows it as covalent and hydrogen at the beginning. But acetic acid can also be written as CH3COOH. This is also its acidic form.
Now we're going to say acids. We're going to say they can break up when they're dissolved into H. So we're going to say that they are soluble covalent compounds that dissolve into H and an ion when placed in solution. So HBr here can break up into H and Br-. So just remember these key things about acids.