When performing a scientific investigation on an unknown substance, how can an indicator help you determine if the substance is a starch?(1 point)
Responses
The indicator will change the taste of the substance.
The indicator will change the taste of the substance.
The indicator will change the state of the substance.
The indicator will change the state of the substance.
The indicator will change the color of the substance.
The indicator will change the color of the substance.
The indicator will change the smell of the substance.
The indicator will change the color of the substance.
The correct response is:
The indicator will change the color of the substance.
When performing a scientific investigation on an unknown substance, an indicator can be used to determine if the substance is a starch by observing any color changes that occur. Specific indicators, such as iodine solution, can react with starch and produce a characteristic deep blue or black color, indicating the presence of starch. By adding the indicator to the unknown substance and observing any color changes, one can determine if the substance is a starch or not.
The correct response is: The indicator will change the color of the substance.
To determine if a substance is a starch, you can use an indicator called iodine. Iodine reacts with starch to produce a deep blue-black color. Here's how to conduct the test:
1. Obtain a small sample of the unknown substance that you want to test.
2. Place the substance in a clean container, such as a test tube or a petri dish.
3. Add a few drops of iodine solution to the substance.
4. Observe any changes in color.
5. If the substance turns a deep blue-black color, it indicates the presence of starch. If there is no color change or a different color change occurs, it suggests the absence of starch.
Using an indicator like iodine allows you to visually identify the presence of starch in the unknown substance.