Starch.
does not matter once the Powder has starch it turns black and the powder can be any color
because the leaves have photosynthesized- glucose is produced. therefore, the excess glucose is converted to starch. The starch is then stored in the leaf-starch is what causes the "green" leaf to turn blue black, as iodine turns blue-black when it reacts with starch.:P
Yes, sugar does not turn blue when mixed with iodine. Iodine reacts with starch, turning it into a blue-black color. Sugar does not contain starch, so it will not have a reaction with iodine in this way.
When you pore iodine on a piece of bread, the bread will turn black. Why? Because, the iodine has a chemical reaction with the starch in the bread. This method is great to find out if a food contains starch (I suggest a potato to try next!).
it is a yellowish/orange colour but when iodine is present, than it will turn an dark-blue/black colour
does not matter once the Powder has starch it turns black and the powder can be any color
Iodine turns blue-black in the presence of starch.
it does not turn blue when mixed with iodine. I don't think there is a colour change.
BlackAns2:It is very unlikely that a ripe banana will have enough starch to turn iodine black. When iodine turns black, it is a positive test for the presence of starch.
If a substance didn't turn blue or black with iodine, it means that it didn't form any complex with iodine. When iodine forms a complex with the substance, the complex is generally blue in color.
Black
Iodine turns blue-black in the presence of starch.
When iodine is added to bread, it reacts with the starch present in the bread. This reaction causes the iodine to turn a blue-black color, allowing for the detection of starch. This can be used as a test to check if the bread contains starch as an ingredient.
because the leaves have photosynthesized- glucose is produced. therefore, the excess glucose is converted to starch. The starch is then stored in the leaf-starch is what causes the "green" leaf to turn blue black, as iodine turns blue-black when it reacts with starch.:P
The leaf should turn blue-black when iodine is added, indicating the presence of starch.
Iodine turns blue-black in the presence of starch due to the formation of a complex between iodine and starch molecules.
Iodine turns blue-black in color in the presence of starch.