Question

*science*
Test no :3
Answer these questions;
1.what are physical changes?Give examples.
2.Explain the formation of rust.
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Answer 1

Answer:

1 Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density. An example of a physical change is the process of tempering steel to form a knife blade example = boiling, melting. 2Rust is an iron oxide , a red oxide formed by the redox reaction of iron and oxygen in the presence of water or moisture in the air. Iron oxide is very common , because iron reacts easily with oxygen in the air. Rust occurs when iron or its alloys, such as steel corrode.