NEEED HELP! ASAP. come up with a mnemonic to help ME remember the four necessary requirements of classical conditioning.

hey 420, are you 420 candidate??lol

allowed for the prediction of the properties of missing elements.

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