When performing a scientific investigation on an unknown substance how can an indicator help you determine if a substance is a starch

1. cornstarch

2. the indicator will change the color of the substance
3. it will bubble and foam
4. baking a cake
5. the balloon inflated

A student is performing a Benedict’s test on an unknown substance. The student adds the reagent (the chemical required to make a color change), and nothing happens. Which conclusion can the student make?

Answer: The test was inconclusive because the student forgot to add heat.

? I dont understand

its a

joe biden

lol

When it comes to determining if a substance is a starch during a scientific investigation, an indicator can certainly be helpful. In this case, you can use an indicator called iodine solution, also known as iodine stain or iodine test. Iodine solution is commonly used to detect the presence of starch.

Here's how you can use an indicator to determine if a substance is a starch:

1. Prepare a small sample of the unknown substance that you want to test. It can be in liquid or solid form.

2. Place a few drops of iodine solution onto the sample. Alternatively, you can dip a clean white tile or paper strip into the iodine solution and then transfer a small amount of the substance onto the iodine-treated area.

3. Observe any change in color that occurs. Iodine solution reacts with starch, causing a distinct blue-black color change. If the substance contains starch, you will see the blue-black coloration.

It's important to note that this test is specific to starch and may not indicate the presence of other types of carbohydrates or substances. Additionally, be cautious while handling iodine solution, as it can be toxic and should be used in a well-ventilated area.

Overall, by using an indicator like iodine solution, you can determine if a substance is a starch based on the observed blue-black color change.

E

E
E
E
E
E
E
E
E
E

E
E
E
E
E
E
3
E

Adding I2 (usually made by dissolving solid I2 in KI solution to make [I3]^-) to starch produces a color change to a dark blue (sometime so dark it is black). You can try this at home by placing a drop of tincture of iodine (usually in a home medicine cabinet) onto the inner part of a potato. Works every time for me.