How can you classify solids by their ability to melt?

What is important to study for nios grade 12 chemistry? i have only one month left.

When balancing a chemical equation:

For each of the following compounds, decide whether the compound's solubility in aqueous solution changes with ph. if the solubility does change, pick the ph at which you'd expect the highest solubility. you'll find ksp data in the aleks data tab. compounds does solubility change with ph