After establishing consensus for how we smell something that is going through a phase change from a solid to a liquid and then to a gas, we began to think about how some things we smell may NOT be going through an obvious phase change due to heat increasing.
Students watched a demonstration today...and here are the results!
Students watched a demonstration today...and here are the results!
We had a big discussion about what must be happening in order to get the indicator paper suspended at the top of the flask to change color, especially knowing the flasks weren't sitting on a hot plate or other heat source. So what exactly does cause the liquids to evaporate?