Which of these is an agent of chemical weathering?(1 point) Responses iron oxide iron oxide copper patina copper patina acid rain acid rain iron
acid rain
The agent of chemical weathering among the given options is acid rain.
To determine which of these is an agent of chemical weathering, let's examine the options one by one:
1. Iron oxide: Iron oxide is a product of chemical weathering rather than an agent itself. It is a red-colored compound commonly known as rust, which forms when iron reacts with oxygen in the presence of water.
2. Copper patina: Copper patina is not an agent of chemical weathering but rather the result of weathering on copper surfaces. Patina is a greenish layer that forms on copper due to exposure to air and moisture over time.
3. Acid rain: Acid rain is indeed an agent of chemical weathering. It is formed when pollutants, such as sulfur dioxide and nitrogen oxide, mix with water vapor in the atmosphere. Acid rain can react chemically with minerals in rocks, causing their breakdown or dissolution.
4. Iron: This option is quite broad, as it does not specify whether it refers to metallic iron or iron in another form. However, metallic iron itself is not considered a typical agent of chemical weathering. Oxidation of iron in the presence of water and oxygen, resulting in the formation of iron oxide (rust), is the more notable process.
Based on the analysis above, the correct answer would be "acid rain" as an agent of chemical weathering.