Question

questions: 8. if you spray iodine on paper, what would you expect to happen? why? 9. if your saliva has salivary amylase, what would you expect to happen when your paper is sprayed with iodine? why?

Explanation:

Step1: Recall iodine - starch reaction

Iodine reacts with starch to form a blue - black complex. Paper contains cellulose, not starch.

Step2: Answer question 8

The paper would not show a blue - black color change. Because paper is mainly made of cellulose and iodine does not react with cellulose to form a colored complex.

Step3: Recall salivary amylase function

Salivary amylase breaks down starch into smaller sugars.

Step4: Answer question 9

If there was starch on the paper and salivary amylase was present before spraying iodine, the area with amylase activity would not turn blue - black. Because salivary amylase would have broken down the starch into smaller sugars that do not react with iodine to form the blue - black complex.

Answer:

1. The paper would not turn blue - black. Because paper is mainly cellulose and iodine doesn't react with cellulose to give a blue - black color.
2. If there was starch on the paper initially, the area with salivary amylase activity would not turn blue - black. Because salivary amylase breaks down starch into smaller sugars that don't react with iodine to form the blue - black complex.