What is the difference between farming and agriculture

Agriculture is the science and practice of growing crops and rearing animals for human consumption. ... Farming is a more individual practice involving an area of land with buildings on it (as well as fencing, water facilities, etc.), that is used to grow crops and/or rear animals for human consumption.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds