Question 3
hcl is the formula for
a)the hydronium ion
b)hydrochloric acid
c)hydrogen peroxide
d)sodium hydroxide

HCl is known as hydrochloric acid. Hence the answer is option B.

Explanation:

Hydrochloric acid is an example of strong acid. This can be completely dissociates into aqua solution. It is also the very common acid used in chemical reactions. It is formed by the fusion of hydrogen atom and chlorine atom. This is formed due to the single substitution of ions.

The molecule has lower value of PH which indicates it as a very strong acid. This add acid is also present in our stomach. This side also helps in proper digestion of food and preservation of the food inside the stomach and it also close all the bacteria which are harmful for the human body

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.