Homogeneous and heterogeneous mixtures
Pure Substances and Mixtures · Chemistry
Study notes
Classify as homogeneous or heterogeneous: (a) salt water, (b) oil and water shaken, (c) air, (d) granite rock. Step 1: Salt water — salt fully dissolved, uniform throughout → homogeneous. Step 2: Oil + water — two visible layers, different composition in each → heterogeneous. Step 3: Air — gases mixed uniformly, single phase → homogeneous. Step 4: Granite — visible different mineral grains → heterogeneous.