Students will be able to plan and carry out an investigation to compare the solubility of different substances, and develop and explain a particle-level model to describe the process of dissolving.

Heat can help some substances dissolve faster in water. Salt, for example, will dissolve quicker in hot water than in cold water. When a substance dissolves, it might look like it has disappeared ...

To compare the dissolving of different substances, they need to be tested in the same way. Students develop a test to compare how the candy coating from an M&M and a Skittle dissolve in water.

The contaminants include toxic "forever chemicals," as well as volatile organic compounds that can cause numerous health issues.

Experts say anyone who drinks water used to filter marijuana smoke will ingest ash, tar and bacteria — but won't become high.