Iodine is commonly used as an indicator to test for the presence of starch. When iodine is added to a sample containing starch, it forms a blue-black complex, indicating the presence of starch. Therefore, in this case, the indicator will reveal the presence of starch in the unknown substance.
A scientist adds iodine as an indicator to an unknown substance. What will this indicator reveal about the substance?(1 point) Responses the presence of glucose the presence of glucose the presence of starch the presence of starch the presence of lipids or fat the presence of lipids or fat the presence of baking powder
3 answers
A student wants to try to convince her parents to stop serving peas for dinner. She lays out her argument that peas are high in fructose, which is a type of sugar. Which test could she use to provide scientific evidence to support her argument that peas are high in fructose?(1 point) Responses vinegar test vinegar test brown paper bag test brown paper bag test iodine test iodine test Benedict's test
To provide scientific evidence that peas are high in fructose (a type of sugar), the student could use the Benedict's test. This test is designed to detect the presence of reducing sugars, including fructose. When the Benedict's reagent is added to a sample containing reducing sugars and heated, it will change color, indicating the presence of those sugars.
The other tests mentioned (vinegar test, brown paper bag test, and iodine test) are not appropriate for detecting fructose. The vinegar test generally checks for acid content, the brown paper bag test detects lipids, and the iodine test is used for starch.