Question

what do these two changes have in common?
sanding a piece of wood
breaking a ceramic plate
select all that apply.
both are changes of state.
both conserve mass.
both are caused by heating.
both are only physical changes.

Explanation:

Sanding wood and breaking a ceramic plate are both physical changes (no new substances form). The law of conservation of mass applies to all physical changes—mass is not created or destroyed. Changes of state (e.g., solid to liquid) do not occur here, and neither change is caused by heating.

Answer:

B. Both conserve mass, D. Both are only physical changes