What are mixtures that have evenly mixed groups of particles that do not settle out called?

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Asample of neon occupies a volume of 375 ml at stp. what will be the volume of neon if the pressure is reduced to 90.0 kpa? a. 422 ml b. 422 l c. 333 ml d. 333 l

The pressure in a fluid is affected by which characteristics of that fluid