*Can you enumerate signs whenmaterials undergo physical andchemical change due presence ofoxygen?*How about the signs whenmaterials undergo changes due tolack of oxygen?
Answer (1)
Answer:Signs of physical and chemical changes in the presence of oxygen:1. Physical changes: - Rust formation: Metals like iron develop a reddish-brown rust when exposed to oxygen and moisture. - Color change: Some materials change color due to oxidation, such as fruits browning when exposed to air.2. Chemical changes: - Combustion: Materials burn or catch fire in the presence of oxygen, producing heat, light, and often gases. - Oxidation: Chemical reactions where a substance reacts with oxygen, such as the browning of fruits or the tarnishing of silver. - Corrosion: The gradual degradation of materials, particularly metals, due to oxidation over time.Signs of changes due to lack of oxygen:1. Physical changes: - Color changes: Some materials may change color due to reduced oxidation, such as leaves turning yellow in low oxygen environments. - Formation of bubbles: In some cases, materials may show bubbling or gas formation due to incomplete reactions when oxygen is limited.2. Chemical changes: - Incomplete combustion: In the absence of sufficient oxygen, combustion processes may result in the production of soot or carbon monoxide instead of carbon dioxide. - Fermentation: Organic materials like sugars may ferment into alcohol and carbon dioxide when oxygen is absent. - Reduction reactions: Some substances may undergo reduction reactions, where oxygen is removed or not involved, leading to different products.
