Hawaii
Horny
hypotenuse
The substances that are hard and which cannot be scratched is known as hard substances
All acids have hydrogen in the beginning of their chemical formula. For example, H2SO4, HCl, and HNO3. So, basically any substance that does not start with an H, is not an acid. Examples of substances that are not acids are: soap, baking soda, windex, salt (also, acids are corrosive, so any substance that doesn't burn your skin is not an acid)
yes
Houston, Texas
hound dog
H hehe
Hypotenuse, hexagon
acids
These substances are called reactants.