NYC Chemistry Regents Exam Jan 2023
Which sample of matter is a mixture?
(1) CO2 (g)
(2) CCl4(l)
(3) MgCl2 (aq)
(4) Sn(s)
Solution: A mixture is composed of two or more substances (elements or compounds). Aq stands for aqueous which means dissolved in water. MgCl2 (aq) is a mixture because it is composed of MgCl2 and H2O. Any substance dissolved in water is a homogeneous mixture.