Question

5. How do you calculate density?

7. Iodine is used to test for what substance found in potatoes?

Answer 1

heya!! friend

the answer to the one question is..

Density is mass divided by volume.

and second one is...Starch

hope it helped u !!!
^_^

Answer 2

5. density=  mass x volume 
Density is defined as the mesurment of mass per unit of volume.

7. iodine is used to test the presence of starch. when iodine react with patato turns a deep shade of blue colour becoz starch contain amlose .. 

hope it will help if u like thn mark it as a brainleist ^_^