Question

Give fast answer please please please please please please please please please please please please please​

Answer 1

Ans:1

a reddish-brown substance that forms on the surface of iron, etc., caused by the action of air and water.

Ans:2

Rust is clearly a substance that is different from iron. Rusting is an example of a chemical change. A chemical property describes the ability of a substance to undergo a specific chemical change. A chemical property of iron is that it is capable of combining with oxygen to form iron oxide, the chemical name of rust.

Ans:3

Photosynthesis is a chemical change as it is the process through which light energy is converted into chemical energy by plants. The involved chemical reaction during photosynthesis is the combination of water and carbon dioxide to produce glucose and oxygen.

Ans:4

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

Ans:5

Chemical change