Would evaporation happen faster or slower in a thick liquid? Explain.

The thickness of a liquid refers to its viscosity. More viscous fluids appear thicker, as compared to less viscous fluids, which appear thinner. A viscous fluid (such as honey) moves much slower, as compared to water, which is a less viscous fluid. Viscosity of a fluid is due to intermolecular attraction; viscous fluids have much higher attraction between constituent molecules as compared to a less viscous fluid. When we heat a fluid, the molecules acquire kinetic energy (thus slowly overcoming these attractive forces) and start moving more rapidly. In comparison, the same amount of heat is able to cause much more rapid movement of molecules in a less viscous or thinner fluid. Thus, the thicker (more viscous) fluids evaporate much more slowly as compared to thinner fluids (less viscous). This is one of the reasons why painters mix paint very frequently, as water evaporates quicker than paint.

Hope this helps.