List the initial substances and the final products.
A core rule taught in these papers—the total mass remains constant before and after a transformation. List the initial substances and the final products
Using tests like the limewater test to detect CO2cap C cap O sub 2 or using a flame to identify oxygen or hydrogen. How to Use the Paper: dissolving salt in water).
Explain why a change is physical or chemical based on the "reversibility" or "appearance of new substances" criteria. List the initial substances and the final products
Changes in state or form where the nature of the substance remains the same (e.g., melting ice, dissolving salt in water).