Which substance cannot be broken down by a chemical change?
1) ammonia
2) ethanol
3) propanol
4) zirconium

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

Which statement correctly describes potassium iodide, ki? there is a one-to-one ratio of potassium ions to iodide ions. potassium gains electrons and iodine loses electrons during the reaction. the lattice is held together by potassium anions and iodide cations.

What forms when chemical reactions combine pollution with sunlight?