Question

a) Write any two methods to prevent rusting.
b) How can you say that rusting and photosynthesis are chemical reactions?
c) Write any two characteristics of a chemical reaction.

Answer 1

Answer:

A)  1.  apply paint

     2. galvanise the metal

     3. Regular Maintenance

B)   both are chemical   changes because we cant get back the original substance after the change

C)  1. change in color

     2. we cant get back the original substance after the change

      3. change in temperature

Answer 2

Answer:

a) Any two method to prevent rusting are as follows -

1. By oiling

2.By paiting

c) Any 2 chraterstics of a chemical reaction are as follows -

1. these reaction cannot be renwed