Choke Tubes Explained By CTD Blogger published on May 4, 2011 in Firearms The inside bore constriction at the muzzle end of a shotgunâs barrel is known as the âchoke.â
difference between elements and compounds atoms are the tiny units which collect up to form all the existing chemical substances atoms can join with other atoms in various ways thus form thousands of molecules and other compounds according to their electron donating or withdrawing abilities they can form covalent bonds or ionic bonds
 A mixture is a combination of compounds or elements that are not  chemically bonded and do not react with each other, while a  compound is when two or more elements or co â¦ mpounds are chemically  bonded with each other to produce a new substance.The constituents of a compound can be separated only by  chemical methods.     Mixtures    Mixtures are impure substances.  They are made up of two or more substances mixed  physically.  The constituents of a mixture are present in varying  ratios.