Which of the following is a heterogeneous mixture?
a. A bottle of brine (slightly salty water).
b. A dish of steamed vegetables, fresh from the microwave oven.
c. The contents of a balloon containing helium, nitrogen, and oxygen gases.
d. A beaker containing a well-stirred mixture of ethanol (drinking alcohol) and water
e. All of the above.
We’re being asked to identify the heterogeneous mixture/s among the given.
Recall that mixtures are combinations of two or more pure substances (elements or compounds).
Mixtures are not chemically combined.
Mixtures can either be:
• Homogeneous: the components are evenly distributed and indistinguishable from each other
• Heterogenous: the components are not evenly distributed and distinguishable from each other