Question

Answer the following questions about the three tests that can be performed on the mystery powder.

Iodine Test
How is the test performed-

What does it test for-

What happens if the test is positive-

What happens if the test is negative- no change will occur

Answer 1

### Iodine Test

#### How is the test performed:
To perform the iodine test, a small amount of the mystery powder is placed on a clean surface or in a test tube. A few drops of iodine solution (usually iodine dissolved in potassium iodide) are then added to the sample. The mixture is gently stirred or observed immediately after the iodine is added.

#### What does it test for:
The iodine test is primarily used to detect the presence of starch in a sample. Starch is a polysaccharide, and the iodine solution reacts specifically with the amylose component of starch.

#### What happens if the test is positive:
If the test is positive, the iodine will react with the starch to produce a deep blue or purple color. This indicates that starch is present in the mystery powder.

#### What happens if the test is negative:
If the test is negative, no change will occur, meaning the iodine solution will remain its original yellow-brown color, indicating that starch is not present in the mystery powder.