How do you say “chemical substance” in Vietnamese?

Vietnamese words for “chemical substance”

• hoá chấtListennoun
  Hanoi [hwaː˧˦ t͡ɕət̚˧˦] · Saigon [waː˦˥ cək̚˦˥]hoá rising chất rising

  a chemical; chemical substance; purified compound

  for “chemical substance” meaning: A material with a specific chemical composition.

• chất hoá họcListennoun
  Hanoi [t͡ɕət̚˧˦ hwaː˧˦ hawk͡p̚˧˨ʔ] · Saigon [cək̚˦˥ waː˦˥ hawk͡p̚˨˩˨]chất rising hoá rising học heavy

  chemical compounds; chemical substances; chemicals

  for “chemical substance” meaning: A material with a specific chemical composition.