Question

b) How can you say that rusting and photosynthesis are chemical reactions?
(2)​

Answer 1

To answer this Question we have to know first that what is a Chemical Reaction?

Chemical Reaction:-

A process in which one or more substances are converted into one or more than different substances.

Or Simple

$\tt Reactants \rightarrow Product(s)$

So, to know that Whether Rusting or Photosynthesis are chemical process or not, we have to first check the reaction of their.

Rusting of Iron:-

$\star \ \ \tt 4Fe + 3O_2 + 6H_2O \rightarrow 4Fe(OH)_3$

Here we can see that reactants formed a new product. So we can conclude that Rusting is a Chemical Reaction.

Photosynthesis:-

$\star \ \ \tt 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2$

Here, we can see that reactants formed new products. So we can conclude that photosynthesis is a Chemical Reaction

Answer 2

Answer:

Explanation:

Photosynthesis is a chemical reaction as it involves in creation or production of a new substance ie. glucose . In the process the change in energy involves light energy changes to chemical energy

Hence ,we can say that photosynthesis is a chemical reaction.

Rusting

In rusting the substance or iron is exposed to air and moisture ,rust formation takes place .Rust is nothing but iron oxide. As we know that a reaction in which a new substance is formed the reaction is called a chemical reaction .

Hence we can say that rust is a chemical reaction .

hope you understand.