Across
- 1. A chemical reaction category governed by the reactivity series rule, where a more reactive element successfully displaces or pushes out a less reactive metallic element from its salt solution or compound.
- 5. A dynamic corrosion prevention mechanism where a highly reactive metal (such as zinc) is intentionally paired with a less reactive metal (such as iron) so that the coating metal willingly undergoes decay and sacrifices itself to preserve the core structure.
- 7. The specific name of the green, protective chemical compound layer that develops over a copper surface as it slowly decays under prolonged exposure to moisture, oxygen, and carbon dioxide.
- 8. A permanent electrochemical surface-coating technique used to safeguard structural components against atmospheric decay by coating them specifically with a thin layer of protective aluminium.
Down
- 2. The precise term given to a highly corrosive liquid mixture formulated by combining concentrated nitric acid with concentrated hydrochloric acid in a strict $1:3$ ratio, notable for being one of the few substances capable of dissolving otherwise unreactive noble metals.
- 3. A permanent chemical protection process defined specifically by coating an underlying iron surface with a layer of zinc to insulate the core metal from damp atmospheric exposure.
- 4. The thermodynamic classification given to chemical processes—such as the intense thermite reaction between aluminium powder and iron oxide powder—that release significant amounts of heat energy to their surroundings.
- 6. A permanent, expensive industrial preservation method where a metal is combined with other elements—such as combining iron with chromium and nickel to yield stainless steel—to permanently alter its structure and prevent chemical decay.