Respirator Recommendations. NIOSH/OSHA. Up to 100 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode*. (APF = 50) Any chemical cartridge respirator with a full facepiece and cartridge(s) providing protection against the compound of concernÂ¿. (APF = 25) Any powered, air-purifying respirator with cartridge(s) providing protection against the compound of concern*Â¿.
A molecule is a particle containing two or more atoms. If it contains only one type of atom it is called an element. An exception to this is diatomic gases (for example: Oxygen, O 2, where the molecule contains two atoms of the same element, bonded covalently.
A molecule is what you get when any atoms join together. A compound is what you get when atoms of two or more different elements join together. All compounds are molecules, but not all molecules are compounds. Water is a molecule because it is made from atoms that have been chemically combined.It is also a compound because the atoms that make water are not all the same-some are oxygen and some are hydrogen. Oxygen in the atmosphere is a molecule because it is made from two atoms of oxygen.It is not a compound because it is made from atoms of only one element-oxygen.This type of molecule is called a diatomic molecule, a molecule made from two atoms of the same type.xygen in the atmosphere is a molecule because it is made from two atoms of oxygen. It is not a compound because it is made from atoms of only one element-oxygen. This type of molecule is called a diatomic molecule, a molecule made from two atoms of the same type.