Question

ii) List any two changes that would accompany a chemical change.
iii) It is advisable not to light fireworks. Explain why? (2 points)
i) What is rusting? State two ways by which it can it be prevented.please answer std 7 ​

Answer 1

Explanation:

Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture. Rust consists of hydrous iron(III) oxides and iron(III) oxide-hydroxide, and is typically associated with the corrosion of refined iron.