A substance is made of small brown particles and small white particles. When poured into water, the substance separates - the brown particles sink and the white particles float.
The original substance would be considered a(n) .

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.