Classify the following substances as a bronsted-lowry acid, bronsted-lowry base, lewis acid, and/or lewis base. hcl, bf_3,ccl_3, -hch_2o, ch_3cl-och_3 , nh_3

HCl is a Bronsted acid, dissociates partially or completely with the release of H+ dissociating as H+ and Cl-.

BF_3 is a Lewis acid because it has an incomplete octet and an empty 2p orbital, so it can accept a lone pair. It is clearly not a Bronsted acid as it does not have a H+ to release on dissociation.

CCl_3  Lewis base

-H Lewis base

CH_2O  Bronsted base

CH_3Cl  Bronsted acid

-OCH_3 Lewis base

NH_3 is a Lewis Base:, N has a a lone pair which it can donate to a Lewis acid like BF3.  

Explanation:

The Brønsted-Lowry theory describes acid-base interactions in terms of proton transfer between chemical species. A Brønsted-Lowry acid is any species that can donate a proton, H+, and a base is any species that can accept a proton. As for chemical structure, this means that any Brønsted-Lowry acid must contain a hydrogen that can be dissociated as H+. To accept a proton, a Brønsted-Lowry base must have at least one solitary pair of electrons to form a new bond with a proton.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.