29. A sample of air was collected near a busy street in LA county. The air sample contained PM2.5 particles that have a total mass of 6.0 x 10 ug (micrograms). The air sample was collected in a container that measures 3.0x10-2 m (length) by 1.0x10-2 m (width) by 1.0x10-² m (height). Calculate the density in units of ug/m2 (micrograms per cubic meter). Look up the World Health Organization guidelines for PM2.5 (or do a google search for “who pm2.5 guidelines") and discuss if the level may be harmful to health. A) 2.0 x 10+! B) 2.0 × 10-11 C) 2.0 × 10-17 D) 5.0 E) 2.0 x 10*7 ug/m³ ug/m ug/m³ ug/m³ ug/m³

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Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.