Question

what do these two changes have in common? making jam firing a clay pot in a hot kiln select all that apply. both are only physical changes. both are caused by heating. both are caused by cooling. both conserve mass.

Explanation:

• Making jam: Heating is involved to cook the fruits and set the jam. In any chemical or physical change, mass is conserved (Law of Conservation of Mass).
• Firing a clay pot in a hot kiln: Heating causes chemical changes (like dehydration of clay minerals) and physical changes (hardening). Mass is conserved as atoms are just rearranged.

Answer:

Both are caused by heating.
Both conserve mass.